rosemount analytical - emerson · 2.1 model 7001/7002 oxygen monitor.....9 2.1.1 facility...

Rosemount Analytical

MODEL 7001D, 7002DOXYGEN MONITORS

INSTRUCTION MANUAL748039-U

NOTICE

The information contained in this document is subject to change without notice.

Manual Part Number 748039-UDecember 2000Printed in U.S.A.

Rosemount Analytical Inc.4125 East La Palma AvenueAnaheim, California 92807-1802

Ryton® is a registered trademark of Phillips Petroleum Co.Teflon® is a registered trademark of E.I. duPont de Nemours and Co., Inc.UNOX® is a trademark for Wastewater Treatment Systems of Union Carbide Corp.

CONTENTS

748039-U Rosemount Analytical December 2000 iModel 7001D, 7002D Oxygen Monitors

PREFACE

SAFETY SUMMARY ..........................................................................................P1

SPECIFICATIONS - GENERAL .........................................................................P3

SPECIFICATIONS – ELECTRICAL....................................................................P3

SPECIFICATIONS - PHYSICAL.........................................................................P4

SPECIFICATIONS - ALARM ..............................................................................P4

SPECIFICATIONS - SENSORS .........................................................................P5

CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE.............P6

RETURNING PARTS TO THE FACTORY .........................................................P6

TRAINING ......................................................................................................P6

DOCUMENTATION............................................................................................P6

COMPLIANCES .................................................................................................P7

SECTION 1. INTRODUCTION

1.1 OVERVIEW .................................................................................................1

1.2 AMPLIFIER MODULE .................................................................................1

1.3 OXYGEN SENSORS...................................................................................2

1.4 MODEL 7001D SENSOR INSTALLATION KITS.........................................4

1.5 MODEL 7002D SENSOR INSTALLATION KITS.........................................5

SECTION 2. INSTALLATION

2.1 MODEL 7001/7002 OXYGEN MONITOR....................................................92.1.1 Facility Preparation ........................................................................92.1.2 Location and Mounting....................................................................92.1.3 Electrical Connections - General Precautions................................10

2.1.3.1. Line Power Connection ..................................................112.1.3.2. System Grounding Connections.....................................112.1.3.3 Sensor Cable Connections.............................................11

CONTENTS

ii December 2000 Rosemount Analytical 748039-UModel 7001D, 7002D Oxygen Monitors

2.1.3.4. Output Cable Connections............................................. 122.1.3.5. Output Connections for Alarms...................................... 13

2.2 MODEL 7001D SENSOR MOUNTING KITS ............................................. 152.2.1 In-Line Flow Kit PN 639900........................................................... 15

2.2.1.1 Monitoring Boiler Feedwater, High-Purity Water, orDeaerated Sea Water................................................................. 162.2.1.2 Monitoring Deoxygenated Brine for Oil Well Flooding ... 18

2.2.2 Submersion Kit PN 623712 ........................................................... 192.2.3 In-Line Flow Kit PN 623711........................................................... 22

2.3 MODEL 7002D SENSOR INSTALLATION KITS ........................................ 252.3.1 Submersion Kits 639901(Polypropylene) and PN 646626

Ryton) ........................................................................... 252.3.2 In-Line Flow Kits PN 639902 (Polypropylene) and PN 646627

(Ryton).......................................................................... 292.3.3 45° Submersion Kit PIN 639903................................................... 322.3.4 Submersion Kit PN 623714 ........................................................... 352.3.5 In-Line Flow Kit PN 623713......................................................... 382.3.6 Equilibrium Sensor Guard Kit PN 624741 .................................... 412.3.7 Equilibrium Sensor Fast Response Kit PN 624742 ...................... 432.3.8 In-Line Kit PN 624743 ( Equilibrium) ............................................ 45

SECTION 3. STARTUP AND CALIBRATION

3.1 SYSTEM STARTUP AND INITIAL CALIBRATION WITH AIR ..................... 49

3.2 CALIBRATION OF MODEL 7001D............................................................. 543.2.1 Calibration for Measurement of Dissolved Oxygen in

High-Purity Water ......................................................... 543.2.2 Calibration for Measurement of Dissolved Oxygen in

Deaerated Sea Water................................................... 553.2.3 Calibration for Measurement of Dissolved Oxygen in

Deoxygenated Brine for Oil Well Flooding.................... 55

3.3 CALIBRATION OF MODEL 7002D............................................................ 573.3.1 Measurements in Sea Water or Brine: Calibration with Air for

Readout of Dissolved Oxygen in Parts Per Millionby Weight (mg/liter). ..................................................... 57

3.3.2 Calibration by Chemical Analysis for Readout of DissolvedOxygen in Parts per Million by Weight (mg/liter)........... 58

3.3.3 Combination of Chemical Analysis and Air Calibration forReadout of Dissolved Oxygen in Parts per Million byWeight (mg/liter) ........................................................... 58

3.3.4 Calibration with Air for Readout of Dissolved Oxygen inPercent of Saturation.................................................... 59

CONTENTS

748039-U Rosemount Analytical December 2000 iiiModel 7001D, 7002D Oxygen Monitors

SECTION 4. OPERATION

4.1 ROUTINE OPERATION .............................................................................61

4.2 FREQUENCY OF CALIBRATION ..............................................................61

4.3 FREQUENCY OF SENSOR RECHARGING..............................................62

SECTION 5. THEORY

5.1 ELECTROCHEMICAL THEORY ................................................................635.1.1 Oxygen Sensor (Rechargeable or Non- Rechargeable) ................635.1.2 Equilibrium Sensor.........................................................................63

5.2 PRACTICAL ASPECTS OF DISSOLVED OXYGEN MEASUREMENT ......645.2.1 Variables Which Influence Measurement.......................................645.2.2 Interrelation of Measurement Units ................................................665.2.3 Readout of Dissolved Oxygen in Parts by Weight..........................675.2.4 Readout of Dissolved Oxygen in Percent Saturation .....................68

SECTION 6. SENSOR MAINTENANCE

6.1 RECHARGEABLE SENSORS.....................................................................716.1.1 Recharging Sensor ........................................................................716.1.2 Rejuvenating Cathode...................................................................74

6.1.2.1 Cell Separator Kit (PN 637358).......................................75

6.2 NON-RECHARGEABLE SENSORS............................................................75

SECTION 7. SERVICE

7.1. SYSTEM CHECKOUT.................................................................................77

7.2 CHECKING SENSOR AND CABLE .............................................................78

7.3 CHECKING NON-RECHARGEABLE SENSOR AND CABLE......................81

7.4 CHECKING ELECTRONICS ........................................................................82

SECTION 8. REPLACEMENT PARTS

8.1 REPLACEMENT PARTS – MODELS 7001D AND 7002D ..........................83

748169 INSTRUCTION SHEET, 624737 HEADER KIT – MODEL 7002D

748597 INSTRUCTION SHEET, SENSOR CONVERSION – RECHARGEABLE TO NON-RECHARGEABLE

GENERAL PRECAUTIONS FOR HANDLING AND STORING HIGH PRESSURE GAS CYLINDERS

WARRANTY

FIELD SERVICE AND REPAIR FACILITIES

CONTENTS

iv December 2000 Rosemount Analytical 748039-UModel 7001D, 7002D Oxygen Monitors

FIGURES

1-1. Model 7001D Oxygen Monitor ................................................................. 21-2. Model 7002D Oxygen Monitor ................................................................. 21-3. Rechargeable Sensor .............................................................................. 31-4. Rechargeable Sensor with Gland ............................................................ 31-5. Non-Rechargeable Sensor....................................................................... 42-1. Power Supply Board Connector Locations .............................................. 112-2. Connections for Potentiometric Recorder with Non-Standard Span ........ 142-3. Typical Example of Oxygen Monitor Connected in Series with Several

Current-Activated Devices ............................................................ 142-4. Rechargeable Sensor with In-Line Flow Kit 639900 – Sectional View..... 152-5. Rechargeable Sensor with In-Line Flow Kit 639900 – Outline and

Mounting Dimensions ................................................................... 152-6. In-Line Flow Kit 639900 - Typical Panel-Mounted Installation................ 162-7. In-Line Flow Kit 639900 - Typical Power Plant Installations..................... 172-8. In-Line Flow Kit 639900 - Typical Installation for Oil Well Flooding.......... 182-9. Non-Rechargeable Sensor with Submersion Kit 623712 – Sectional

View.............................................................................................. 192-10. Non-Rechargeable Sensor with Submersion Kit 623712 – Outline

and Mounting Dimensions ............................................................ 202-11. Non-Rechargeable Sensor Submersion Kit 623712 – Typical

Installation .................................................................................... 212-12. Non-Rechargeable Sensor with In-Line Pressure Compensation

Kit 623711 – Sectional View ......................................................... 222-13. Non-Rechargeable Sensor with In-Line Flow Kit 623711 – Outline

and Mounting Dimensions ............................................................ 232-14. Non-Rechargeable Sensor with In-Line Pressure Compensation

Kit 623711 – Typical Installation ................................................... 242-15. Rechargeable Sensor with Submersion Kit 639901 or 646626 –

Sectional View .............................................................................. 252-16. Rechargeable Sensor with Submersion Kit 639901 or 646626 –

Outline and Mounting Dimensions................................................ 262-17. Rechargeable Sensor with Submersion Kit 639901 or 646626 –

Preferred Mounting Orientation .................................................... 272-18. Rechargeable Sensor with Submersion Assembly 639901 or 646626

– Typical Installation During Plant Construction ........................... 272-19. Rechargeable Sensor with Submersion Assembly 639901 or 646626

– Typical Installation In An Existing Plant ..................................... 282-20. Rechargeable Sensor with In-Line Flow Kit PN 639902 or 646627

– Sectional View ........................................................................... 292-21. Rechargeable Sensor with In-Line Flow Kit PN 639902 or 646627

– Outline and Mounting Dimensions............................................. 302-22. Rechargeable Sensor with In-Line Flow Kit PN 639902 or 646627

– Preferred Orientation ................................................................. 31

CONTENTS

748039-U Rosemount Analytical December 2000 vModel 7001D, 7002D Oxygen Monitors

2-23. 45° Rechargeable Sensor with Submersion Kit 639903 – SectionalView ..............................................................................................32

2-24. 45° Rechargeable Sensor with Submersion Kit – Outline and MountingDimensions ...................................................................................33

2-25. 45° Rechargeable Sensor with Submersion Kit – Typical InstallationIn UNOX System...........................................................................34

2-26. Non-Rechargeable Sensor with Submersion Kit PN 623714 –Sectional View...............................................................................35

2-27. Non-Rechargeable Sensor with Submersion Kit 623714 – Outline andMounting Dimensions....................................................................36

2-28. Non-Rechargeable Sensor with Submersion Kit 623714 –Typical Installation.........................................................................37

2-29. Non-Rechargeable Sensor with In-Line Flow Kit PN 623713 –Sectional View...............................................................................38

2-30. Non-Rechargeable Sensor with In-Line Flow Kit PN 623713 –Outline and Mounting Dimensions ................................................39

2-31. Non-Rechargeable Sensor with In-Line Flow Kit 623713 –Typical Installation.........................................................................40

2-32. Equilibrium Sensor with Guard Kit 624741 – Sectional View....................412-33. Equilibrium Sensor with Guard Kit 624741 – Outline and Mounting

Dimensions ...................................................................................422-34. Equilibrium Sensor with Fast Response Kit 624742 – Sectional View.....432-35. Equilibrium Sensor with Fast Response Kit 624742 – Outline and

Mounting Dimensions....................................................................442-36. Equilibrium Sensor with In-Line Flow Kit 624743 – Sectional View ..........452-37. Equilibrium Sensor with In-line Flow Kit 624743 – Outline and

Mounting Dimensions....................................................................462-38. Equilibrium Sensor with In-Line Flow Kit 624743 – Preferred Orientation 473-1. Display Board Controls and Adjustments .................................................503-2. Isolated Current Output Board..................................................................513-3. Solubility of Oxygen in Water of Various Degrees of Salinity ...................565-1. Rechargeable Oxygen Sensor – Sectional View ......................................645-2. Solubility of Oxygen in Air-Saturated Water as a Function of

Temperature..................................................................................686-1. Oxygen Sensor – Exploded View .............................................................736-2. Location of Cell Separator in Oxygen Sensor...........................................757-1. Expected Display Reading vs. Substitute Resistance (Model 7001D)......797-2. Expected Display Reading vs. Substitute Resistance (Model 7002D.......80

TABLES

7-1. Rechargeable Sensor Problems Troubleshooting Guide............................817-2. Non-Rechargeable Sensor Problems Troubleshooting Guide....................81

CONTENTS

vi December 2000 Rosemount Analytical 748039-UModel 7001D, 7002D Oxygen Monitors

DRAWINGS (LOCATED IN REAR OF MANUAL)620434 Schematic, Isolated V/I Board622617 Outline and Mounting Dimensions, Oxygen Monitor622227 Interconnect Diagram, Oxygen Monitor622530 Schematic, Display Board622538 Schematic, Power Supply Board

PREFACE

748039-U Rosemount Analytical December 2000 P1Model 7001D, 7002D Oxygen Monitors

SAFETY SUMMARY

To avoid explosion, loss of life, personal injury and damage to this equipment andon-site property, all personnel authorized to install, operate and service the Model7001D, 7002D Oxygen Monitors should be thoroughly familiar with and strictly followthe instructions in this manual. Save these instructions.

DANGER is used to indicate the presence of a hazard which will cause severepersonal injury, death, or substantial property damage if the warning is ignored

WARNING is used to indicate the presence of a hazard which can cause severepersonal injury, death, or substantial property damage if the warning is ignored.

CAUTION is used to indicate the presence of a hazard which will or can cause minorpersonal injury or property damage if the warning is ignored.

NOTE is used to indicate installation, operation, or maintenance information which isimportant but not hazard-related.

Do not operate without doors and covers secure. Servicing requires access tolive parts which can cause death or serious injury. Refer servicing to qualifiedpersonnel.

For safety and proper performance this instrument must be connected to aproperly grounded three-wire source of power.

This instrument was shipped from the factory set up to operate on either 115VAC 50/60 Hz, or 230 VAC 50/60 Hz, as specified by sales order. For operationon 230 VAC 50/60 Hz, see Section 2.3.1.

WARNING: ELECTRICAL SHOCK HAZARD

PREFACE

P2 December 2000 Rosemount Analytical 748039-UModel 7001D, 7002D Oxygen Monitors

Tampering or unauthorized substitution of components may adversely affectsafety of this product. Use only factory documented components for repair

WARNING: PARTS INTEGRITY!

PREFACE


SPECIFICATIONS - GENERAL

CATALOG NUMBER MODEL 7001D

192601

CATALOG NUMBER MODEL 7002D192602

FRONT PANEL DISPLAY MODEL 7001D

0 to 199.9 parts-per-thousand-million (p/109 ) by weight, displayed as ppb

FRONT PANEL DISPLAY MODEL 7002D0 to 19.9 parts-per-thousand-million (p/106 ) by weight, displayed as ppm

AMBIENT TEMPERATURE

-20°F to 122°F (-29°C to 50°C)

AMBIENT HUMIDITY

Up to 95% relative humidity, non-condensing

SYSTEM LINEARITY

For constant sample temperature: ±1% of fullscale

SAMPLE TEMPERATURE

32°F to 110°F (0°C to 44°C)1

SPECIFICATIONS – ELECTRICAL

POWER REQUIREMENTS (SWITCH SELECTABLE)107 to 127 VAC 50/60 Hz @ 0.2 Ampere214 to 254 VAC 50/60 Hz @ 0.1 Ampere

DISPLAY

Digital liquid crystal (LCD)

OUTPUT (POTENTIOMETRIC, SELECTABLE RANGE)

0 to 200, 0 to 100 or 0 to 50 ppb, fullscale

SELECTABLE FULLSCALE VOLTAGE

0 to 10 volts, 0 to 5 volts, or 0 to 1 volt

POTENTIOMETRIC OUTPUT

Minimum load is 2K ohms

ISOLATED CURRENT OUTPUT (OPTIONAL)Field selectable 0 to 20 mA or 4 to 20 mA over same range aspotentiometric outputMaximum load for current output is 600 ohms

1 Rated specifications are for an operating temperature of 25°C.

PREFACE


SPECIFICATIONS - PHYSICALENCLOSURE

ABS Plastic, Black, NEMA Type 4X, IP65

MOUNTING

Standard: Panel MountOptional: Wall Mount, Pipe Mount

DIMENSIONS

5.7 x 5.7 x 7.6 inches (14 x 14 x 19 cm) HxWxD

WEIGHT

Approximately 4.2 pounds (1.9 kg)

ENCLOSURE CLASSIFICATION

General purposeOptional air purge designed to NFPA-496 Type Z 1

MAXIMUM DISTANCE BETWEEN OXYGEN MONITOR AND SENSOR2

1000 feet (304.8 meters)

SPECIFICATIONS - ALARM

ALARM MODEL 7001D

0 to 200, 0 to 100 or 0 to 50 ppb, fullscale

ALARM MODEL 7002D

0 to 20, 0 to 10 or 0 to 2 ppm, fullscale

ALARM CONTACTS

Two independently adjustable SPDT relay contact actuations

ALARM RELAY CONTACTS RATINGS(RESISTIVE LOAD)Maximum switching voltage: 250 VAC, 30 VDCMaximum switching current: 3A

DEADBAND

Adjustable from less than 1% to 20% of range at any setpoint

REPEATABILITY

±0.1% of range

1 The optional air purge, when installed along with user supplied components, is designed to equip the instrument

enclosure with Type Z protection per Standard ANSI/NFPA 496-1986. This reduces the classification within theenclosure from Class I, Division 2 (normally non-hazardous) to non-hazardous, thus permitting installation in a locationclassified Class I, Groups A, B, C, D, Division 2. This method of protection is recognized in Article 500-1 of the NationalElectrical Code (NEC, ANSI/NFPA 70).

2 The oxygen sensors and interconnecting cable used with the Models 7001D and 7002D Oxygen Monitors are non-incendive in normal operation and comply with the requirements of Articles 501-3 (b)(1) c and 501-4 (b), Exception of theNational Electrical Code, ANSI/NFPA 70-1987, for installation in Class I, Groups A,B,C,D, Division 2 classified locations.

PREFACE


SPECIFICATIONS - SENSORS

TYPES - 7001D

Rechargeable, Polypropylene - PN 623246

Non-Rechargeable, Polypropylene - PN 623740

TYPES - 7002DRechargeable, Polypropylene - PN 623245Rechargeable, Ryton – PN 190404Non-Rechargeable, Polypropylene - PN 623741

STABILITY

±1% of fullscale at any given temperature per 24 hours

TEMPERATURE COMPENSATION

32°F to 110°F (0°C to 44°C) ±6% of reading60°F to 90°F (15°C to 32°C) ±3% of readingFor any 30°F (16°C) range ±4% of reading

RESPONSE TIME

90% in 20 seconds for rechargeable and non-rechargeable sensors90% in 60 seconds for equilibrium sensor

SAMPLE PRESSURE

0 to 50 psig (0 to 345 kPa)1

ALSO REFER TO INSTRUCTIONS SUPPLIED WITH SENSOR.

1 With atmospheric discharge of sample.

PREFACE


CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICEFor order administration, replacement Parts, application assistance, on-site or factoryrepair, service or maintenance contract information, contact:

Rosemount Analytical Inc.Process Analytical DivisionCustomer Service Center

1-800-433-6076

RETURNING PARTS TO THE FACTORYBefore returning parts, contact the Customer Service Center and request a ReturnedMaterials Authorization (RMA) number. Please have the following information whenyou call: Model Number, Serial Number, and Purchase Order Number or Sales OrderNumber.

Prior authorization by the factory must be obtained before returned materials will beaccepted. Unauthorized returns will be returned to the sender, freight collect.

When returning any product or component that has been exposed to a toxic, corrosiveor other hazardous material or used in such a hazardous environment, the user mustattach an appropriate Material Safety Data Sheet (M.S.D.S.) or a written certificationthat the material has been decontaminated, disinfected and/or detoxified.

Return to:

Rosemount Analytical Inc.4125 East La Palma Avenue

Anaheim, California 92807-1802USA

TRAININGA comprehensive Factory Training Program of operator and service classes isavailable. For a copy of the Current Operator and Service Training Schedule contactthe Technical Services Department at:

Rosemount Analytical Inc.Phone: 1-714-986-7600FAX: 1-714-577-8006

DOCUMENTATIONThe following Model 7001D, 7002D Oxygen Monitors instruction materials areavailable. Contact Customer Service or the local representative to order.

748039 Instruction Manual (this document)

PREFACE


COMPLIANCESThe Model 7001D and 7002D Oxygen Monitors are designed to comply with applicableAmerican standards for protection against electrical shock, mechanical and fire hazards innon-hazardous locations. The instrument(s) must be installed in accordance with theprovisions of the National Electrical Code (NEC), ANSI/NFPA 70, and/or any applicablenational or local code(s), and, operated and maintained in the recommended manner.

PREFACE


NOTES

1INTRODUCTION

748039-U Rosemount Analytical December 2000 1Model 7001D, 7002D Oxygen Monitors

1.1 OVERVIEWModel 7001D and 7002D Oxygen Monitors (Figure 1-1) automatically and continuouslymeasure the concentration of dissolved oxygen in water or non-aqueous solution. Thedetermination is based on measurement of the electrical current developed by anamperometric sensor in contact with the sample.

The monitors provide direct readout, on a front-panel display, of dissolved oxygen. TheModel 7001D readout is in parts per thousand million (ppb) by weight, while the Model7002D readout is in parts per million (ppm) by weight. Alarms and a potentiometric outputare standard features. The full scale range of the alarms and the potentiometric output areeach independently selectable. Thus, the range of the potentiometric output may bechanged without the need to readjust alarm setpoints.

The oxygen monitor system consists of a sensor, a chamber, and an amplifier module. Thesensor is housed within the chamber and is connected to the amplifier by a multi-conductorshielded cable.

1.2 AMPLIFIER MODULEThe amplifier module conditions the sensor output signal to provide direct readout ofdissolved oxygen in parts per thousand million (ppb) (Model 7001D) or parts per million(ppm) (Model 7002D) by weight. It also contains current-measuring circuitry, operatingcontrols, digital display, alarms and signal output provisions.

The module is designed for panel mounting. An accessory kit (PN 622622) permits theamplifier module to be mounted on a vertical or horizontal pipe. An accessory kit (PN652117) permits wall (surface) mounting. An optional air purge is designed to meetrequirements for NFPA 496 Type Z air purge (see specifications) .

An accessory board (PN 621023) provides a field-selectable 0 to 20 milliampere or 4 to 20milliampere isolated current output.

INTRODUCTION

2 December 2000 Rosemount Analytical 748039-UModel 7001D, 7002D Oxygen Monitors

LOW

SET PTPPB

LOW

SET PT

Model 7001D Oxygen Monitor

LOW

SET PTPPM

LOW

SET PT

Model 7002D Oxygen Monitor

FIGURE 1-1. MODEL 7001D OXYGEN MONITOR

FIGURE 1-2. MODEL 7002D OXYGEN MONITOR

1.3 OXYGEN SENSORSRosemount Analytical offers rechargeable and disposable oxygen sensors which can beused with the Model 7001D and 7002D. See Figures 1-3, 1-4 and 1-5. See Sections 2.4 -Sensors, Rechargeable, 2.5 - Sensors - Non-Rechargeable and 7.3 - Sensors,Replacement Parts for additional information. Sensors are ordered separately from kits.The available kits are: Submersion, In-Line Flow, and Fast Response (Section 1.4).

The rechargeable oxygen sensors are available in polypropylene or RYTON with theassociated hardware available in PVC or RYTON. The non-rechargeable oxygen sensorsare available in polypropylene with associated hardware in PVC.

INTRODUCTION


Integral Glandwith O-Rings

Polypropylene bodied sensors are more resistant to service where conditions are moreextreme and hydrocarbons may be present in the sample stream. RYTON bodied sensorsare most resistant to organics, but have specific limitations in resistance to certain organiccompounds1.

Model 7001D SensorsRechargeable with Gland, Polypropylene 623246Non-Rechargeable, Polypropylene 623740

Model 7002D SensorsRechargeable with Gland, Polypropylene 623245Rechargeable with Gland, Ryton 190404Rechargeable Equilibrium with Gland 624750Rechargeable 45° 623373Non-Rechargeable, Polypropylene 623741

FIGURE 1-3. RECHARGEABLE SENSOR

FIGURE 1-4. RECHARGEABLE SENSOR WITH GLAND

1 'RYTON is resistant to 30% sulfuric acid, 85% phosphoric-acid, 30% sodium hydroxide, gasoline, aliphatic alcohols, esters, ethers, and ketones as well as to aromatic

amines. It is not particularly suited for service in strong oxidizing agents, aliphatic amines, chlorinated hydrocarbons, or aromatic nitrites, aldehydes, and nitro compounds.

INTRODUCTION


FIGURE 1-5. NON-RECHARGEABLE SENSOR

1.4 MODEL 7001D SENSOR INSTALLATION KITS

Note:

Sensor installation kits DO NOT include a sensor.

Fast Response Liquid Flow Kit PN 639900 (Rechargeable, Polypropylene)Used with rechargeable sensor PN 623246, this kit is designed for ppb level dissolvedoxygen in water applications. The sample enters the chamber through a nozzle andimpinges directly on the sensor membrane for fast response, then discharges atatmospheric pressure. Nominal flow is 250 to 500 cc/min.

Typical sample streams include: high purity water, such as boiler feedwater; deaerated seawater feed in evaporative desalination processes; and deoxygenated brine, as used in oilwell flooding.

Fast Response Liquid Flow Kit PN 623711 ( Non- Rechargeable, Polypropylene)Designed for use with non-rechargeable oxygen sensor (PN 623740) when a flowing liquidstream with discharge of the effluent from the flow chamber at atmospheric pressure isbeing measured. This requirement means that upstream sample pressure reduction mustbe performed on the process sample from a pressurized source before it is presented to theflow chamber for analysis by the sensor. Sample input flow rate should be selected in therange of 50 to 100 cc/min and care must be taken with downstream pressure drops toprevent back pressurization of the sensor. Typical applications are the same as Kit 639900.

INTRODUCTION


Submersion Kit PN 623712 (Non-Rechargeable, Polypropylene)Used with non-rechargeable sensor 623740 for liquid phase oxygen measurements. It isintended for use when the liquid phase sensor is to be inserted through a vessel wall as inthe monitoring of a process vessel head space or when a large diameter process is beingmonitored directly by insertion of the sensor through the pipe. This kit exposes the sensormembrane, diaphragm and compensator directly to the sample, with no flow chamber, whileprotecting the connector from contact with the sample.

1.5 MODEL 7002D SENSOR INSTALLATION KITSNote:

Sensor installation kits DO NOT include a sensor.

Submersion Kit PN 639901 (Rechargeable, Polypropylene)Submersion Kit PN 646626 (Rechargeable, RYTON)Used with rechargeable sensor PN 623245 (polypropylene) or PN 190404 (Ryton), one ofthe principal applications of the submersion assembly is use in wastewater treatmentaeration tanks. In this application the most satisfactory location is at the side of the aerationtank, either on the diffuser side or on the opposite side. Most installations are made withthe sensor located above the diffuser. Because air bubbles or debris could become trappedon the active area of the electrode, the sensor (which is not position sensitive) should bemounted at right angles to flow. Installations made in this way have given many months ofcontinuous service with the only operating requirement being an occasional calibrationcheck.

Typical applications for these kits are monitoring natural waters, treated water, wastewater,non-aqueous process streams and sewage treatment processes. The submersionassembly permits placing the sensor at depth in a tank, open channel or stream, at amaximum pressure of 50 psig (345 kPa), equivalent to a water depth of approximately 100feet (approximately 30 m).

Pressure Compensated In-Line Flow Kit PN 639902 (Rechargeable, Polypropylene)Pressure Compensated In-Line Flow Kit PN 646627 (Rechargeable, RYTON)Used with sensor PN 623245 (polypropylene) or PN 190404 (Ryton), some typicalapplications for these kits are monitoring neutral waters, treated water, and wastewater.The kits may also be used when the Model 7002D is set up to monitor non-aqueousprocess streams. The in-line pressure-compensated flow chamber used permits mountingthe sensor in a variable-pressure liquid sample stream, at pressures up to 50 psig (345kPa). The typical application is in-line monitoring, with the flow assembly connected directlyinto the process stream pipeline. An alternative application involves discharge toatmospheric pressure where discharge rates are high.

The sensor responds to partial pressure of oxygen in the flowing sample. If total pressurechanges, the oxygen partial pressure changes proportionally, and the sensor respondsaccordingly.

45°°°° Submersion Kit PN 639903 (Rechargeable, Polypropylene)Used with rechargeable sensor 635747, this configuration was designed for use with theUNOX™ process for secondary treatment of sewage, developed by the Linde Division of

INTRODUCTION


Union Carbide Corporation. The method involves introduction of pure oxygen intowastewater in a closed tank system. It is intended for use when the liquid phase sensor isto be inserted through a vessel wall as in the monitoring of a process vessel head space orwhen a large diameter process is being monitored directly by insertion of the sensor throughthe pipe. The kit includes a 45° submersion assembly.

System characteristics impose special requirements:

1. Avoiding entrapment of bubbles on the sensor membrane is particularly important.Bubbles are pure oxygen, and thus would cause greater readout errors than the airbubbles present in conventional aeration systems. To minimize bubble entrapment,sensor membrane must be inclined at 45°. The sensor is functionally identical to thoseprovided in the other sensor kits, but differs physically. While the typical sensor has acylindrical body, the body of the special sensor incorporates a 45° elbow. Thus, with thesubmersion chamber mounted on the bottom of a vertical pipe (Figure 2-12A), thesensor membrane has the required 45° inclination.

2. The use of a closed tank imposes dimensional limitations on the sensor mountingarrangement. Design of the submersion assembly permits insertion of the sensor into aclosed tank through a vertical standpipe with minimum inside diameter of 6.0 inches/152mm. The standpipe has a flange seat at the top of the tank and extends downward intothe tank, below the liquid level.

In-Line Flow Kit PN 623713 (Non-Rechargeable, Polypropylene)Used with sensor PN 623741 this configuration can be used for the same applications as kitPN 639901, discussed in the previous Section.

The flow chamber used with this kit serves the same purpose as the fast-response-liquidand fast-response-gas flow chambers for rechargeable sensors.

This kit is designed for analysis of liquid oxygen samples when a stream with discharge ofthe effluent from the flow chamber at atmospheric pressure is being measured. Thisrequirement means that upstream sample pressure reduction must be performed on theprocess sample from a pressurized source before it is presented to the flow chamber foranalysis by the sensor. Sample input flow rate should be selected in the range of 50 to 100cc/min and care must be taken with downstream pressure drops to prevent backpressurization of the sensor.

Submersion Kit PN 623714 ( Non-Rechargeable, Polypropylene)Used with sensor PN 623741, this configuration can be used for the same applications askit PN 639901, discussed in the previous Section.

The submersion assembly used with this kit serves the same purpose as the submersionassembly for rechargeable sensors except that no cable accessory is available.

This kit is intended for use when the liquid phase sensor is to be inserted through a vesselwall as in the monitoring of a process vessel head space or when a large diameter processis being monitored directly by insertion of the sensor through the pipe.

INTRODUCTION


Guard Kit PN 624741 ( Equilibrium)Used with sensor 624750, typical applications are monitoring industrial municipal treatedwater and waste waters, especially secondary treatment of sewage. The guard assemblyused in this kit protects the membrane from possible damage due to floating solids andsevere agitation in sample streams commonly found in these applications.

Fast Response Kit PN 624742 (Equilibrium)Used with sensor 624750, this kit is designed for use when a flowing liquid stream withdischarge of the effluent from the flow chamber at atmospheric pressure is being measured.Sample input flow rate should be selected in the range of 2-5 cc/min.

The sample enters the chamber through a nozzle and impinges directly on the sensormembrane for fast response, then discharges at atmospheric pressure. The nominal flowrate is 2 to 5 cc/sec. The sensor and flow chamber is designed to have minimum volumesand thus provide fast response in spite of the low flow rates.

Pressure Compensation In-Line Kit PN 624743 ( Equilibrium)Used with sensor 624750, this kit permits mounting the sensor in a variable pressure liquidsample stream, at pressures up to 50 psig (345 kPa). The typical application is in-linemonitoring with the flow assembly connected directly into the process stream pipeline. Analternative application involves discharge to atmospheric pressure where discharge ratesare high.

INTRODUCTION


NOTES

2INSTALLATION


Section Two is divided into three parts: Installation of Model 7001/7002D Oxygen Monitor,Installation of Oxygen Sensor Kits for Model 7001D Monitor and Installation of OxygenSensor Kits for Model 7002D Monitor. Applicable installation instructions' are placed at theend of each part.

The monitor is shipped set up to operate with a rechargeable sensor. To convert theinstrument to operate with a non-rechargeable or equilibrium sensor, refer to Instructions748597 or 748169, placed at the back of this manual.

The sensors are shipped assembled and charged, ready for use in either the rechargeablenon-rechargeable, or equilibrium configuration. The non-rechargeable sensor is notreworkable. The rechargeable and equilibrium sensors may be recharged or rejuvenated ifits performance is marginal due to long storage or other unusual conditions. Refer toSection 6 for the correct recharging method. When operating fresh from the box, or after arecharge/rejuvenation procedure, the rechargeable sensor may require recharging asfrequently as every three months. There is no known specific cause for service limitation ofthe non-rechargeable sensor; therefore, no storage or service life levels can be accuratelyset.

2.1 MODEL 7001/7002 OXYGEN MONITOR

2.1.1 FACILITY PREPARATION

Outline and mounting diagrams for the amplifier module are given in DWG 622617. Outlineand mounting dimensions for the alternative oxygen sensor installation kits are provided inSection 2.2 (Model 7001D) and Section 2.3 (Model 7002D). Electrical connections areshown in DWG 622227.

2.1.2 LOCATION AND MOUNTING

The amplifier module is designed to meet NEMA-4X requirements, and may be mountedoutdoors. Permissible ambient temperature range is -20 to +122°F (-29 to + 50°C).

Panel mount the amplifier, or use the accessory wall-mount kit (PN 652117) or accessorypipe-mount kit (PN 622622).

Mount the sensor in an environment within the permissible range of 32°F to 110°F (0°C to44°C). Installation instructions for the alternative oxygen sensor installation kits areprovided in Section 2.2 (Model 7001D) and Section 2.3 (Model 7002D).

INSTALLATION


Sensor and amplifier are interconnected by a multi-conductor shielded cable. The cable isavailable in 20 foot length (PN 193661) or 21 feet to 1000 feet (PN 193662, specify length).

2.1.3 ELECTRICAL CONNECTIONS - GENERAL PRECAUTIONS

Wiring diagrams, schematics and other engineering drawings are placed in numerical orderat the back of this manual.

Do not operate without doors and internal circuit panel secure. Servicingrequires access to live parts which can cause death or serious injury. Referservicing to qualified personnel.

For safety and proper performance this instrument must be connected to aproperly grounded three-wire source of power. Electrical installation must bemade in accordance with any applicable national or local codes.

Alarm switching relay contacts wired to separate power source must bedisconnected before servicing.

Unused cable conduit entries must be securely sealed by flameproof closures toprovide enclosure integrity in compliance with personnel safety andenvironmental protection requirements. The plastic closures provided are forshipping protection only. When installing instrument, observe all notes ondrawing 622617 (in rear of this manual).

The non-metallic enclosure does not provide grounding between conduitconnections. Use grounding-type bushings and jumper wires.

NOTE

Electrical installation must be made in accordance with the National ElectricalCode and/or any applicable local or national codes.

NOTE

For watertight installation conforming to the requirements of NEMA-4X,approved watertight hubs and closures must be used.

! WARNING: ENCLOSURE INTEGRITY

! CAUTION: CONDUIT GROUNDING


INSTALLATION


2.1.3.1 Line Power ConnectionModels 7001D and 7002D monitors provide switch-selectable operation on either 107 to127 VAC or 214 to 254 VAC, 50/60 Hz power. Open the door (refer to Figure 3-1). Loosenthe retainer screw that holds the display board and pivot the display board to access thepower supply board. Verify that the line voltage selector switch is set to indicate the propernominal line voltage: 115 or 230 VAC.

Electrical power is supplied to the monitor via a customer-supplied three-conductor cable,type SJT with 18 AWG minimum wire size. Route power cable through conduit and intoappropriate opening in monitor enclosure. Connect power cable leads to terminal strip TB5on the power supply board, as shown in Figure 2-1 and DWG 622227.

2.1.3.2. System Grounding ConnectionsWithin the analyzer, a ground terminal (GND) is provided on the power supply board. Referto Figure 2-1. This terminal must be connected, via the ground lead of the three-conductorpower cable to a good earth ground.

2.1.3.3 Sensor Cable ConnectionsThe sensor cable is supplied, as ordered, in any length up to a maximum of 1000 feet (305m). If a long cable is used, it should be routed to the amplifier through appropriate conduit.Connect the amplifier end of the cable to terminal strips TB1 and TB2 on the power supplyboard, as shown in Figure 2-1 and DWG 622227.

Connect the remaining end of the cable to the sensor when installation of the sensor kit iscomplete.

FIGURE 2-1. POWER SUPPLY BOARD CONNECTOR LOCATIONS

Isolated V/I Board(Option)(see Figure 3-2)

AC PowerTB5

J1

TB1 TB2 TB3

TB4

S1

U5

U1

U2 U4

CR1

U3

CR4

CR3

CR2

OGI

OGI

OGI

OIG

OIG

K2

K1

C2 C1C3

T1

F1

TB5

GND

NEUTRAL/L2

HOT/L1

NO

COM

NC

NO

COM

NC

ALARM

ALARM

SHIELD

+VOLTAGE OUT

-VOLTAGE OUT

+CURRENT OUT

-CURRENT OUT

3K/10KTHERM

SHLD

CATH

AM

30KTHERM

POWER SUPPLY BOARD 622537

R1

R

R3

R4

R8

U6

OGI

U3

U2

1 2 3 4 I G O

C5

C4

C2

U4

U5

IGO

C1U1 J1

R5 R6

R9 CR2

CR1

C3

SensorTB2

Current OutputTB3

RecorderTB3

Voltage Select SwitchS1

INSTALLATION


2.1.3.4. Output Cable Connections

Do not route potentiometric output or current output cables through the sameconduit as the power cable or alarm output cable, to avoid shock hazard and ACpickup.

If a recorder, controller, or other output device is used, connect it via a number 22 ornumber 24 AWG two-conductor shielded cable. Route the output cable through conduit tothe amplifier module, and into the case through the appropriate opening shown in DWG622617, Sheet 2.

Potentiometric Output

1. Connect leads of shielded recorder cable to VOLTAGE OUT + and VOLTAGE OUT -terminals of TB3 on Power Supply Board, Figure 2-1. Connect shield to SHD terminal.

2. Connect other end of output cable to terminals of recorder or other potentiometricdevice.

a. For devices with spans of 0 to 1, 0 to 5, or 0 to 10 volts, connect cable directly toinput terminals of the, device, making sure polarity is correct.

b. For devices with intermediate spans, i.e., between the specified values, connectcable to device via a suitable external voltage divider, as shown in Figure 2-2.

Isolated Current Output Accessory

1. Verify that the accessory current output board (Isolated V/I Board), if used, is properlyin place in its connector. See Figure 2-1. If originally ordered with the oxygen monitor,the board is factory installed.

2. Connect leads of shielded cable to CURRENT OUT + and CURRENT OUT - terminalsof TB3 on Power Supply Board, Figure 2-1. Connect shield to SHD terminal.

3. Connect other end of output cable to input terminals of recorder or othercurrent-actuated device, making sure polarity is correct. If two or morecurrent-actuated devices are to be used, they must be connected in series. Refer toFigure 2-3.

Total resistance of all output devices and associated interconnection cable mustnot exceed 600 ohms.

WARNING

! CAUTION: TOTAL RESISTANCE

INSTALLATION


4. Since neither the CURRENT OUT + nor the CURRENT OUT - terminal is grounded,the current loop should be grounded at some point within the circuit. The ground pointshould be chosen to minimize noise or other undesirable interactions.

2.1.3.5 Output Connections for Alarms

Alarm Output Connections

The alarm output provides two sets of relay contacts for actuation of alarm and/orprocess-control functions. Leads from the customer-supplied external alarm systemconnect to terminals on TB4, as shown in DWG 622227.

If the alarm contacts are connected to any device that produces radio frequencyinterference (RFI), it should be arc-suppressed. Arc suppressor (PN 858728) isrecommended. When possible, the oxygen monitor should operate on a different AC powersource to minimize RFI.

Alarm Relay Characteristics

The HI ALARM and LO ALARM outputs are provided by two identical single-poledouble-throw relays. Relay contacts are rated at (resistive):

3A, 250 VAC3A, 30 VDC

Removal of AC power from the analyzer, as in a power failure, de-energizes both relays.

Hi Alarm Relay

The HI ALARM relay coil is energized when the display moves upscale through the valuethat corresponds to the setpoint plus deadband. This relay coil is de-energized whendisplay moves downscale through the value that corresponds to setpoint minus deadband.

Lo Alarm Relay

The LO ALARM relay coil is energized when the display moves downscale through thevalue that corresponds to setpoint minus deadband. This relay coil is de-energized whenthe display moves upscale through the value that corresponds to setpoint plus deadband.

Alarm Reset

The HI ALARM and LO ALARM functions both incorporate automatic reset. When thedisplay reading goes beyond the pre-selected limits, the corresponding relay is energized.When the display reading returns within the acceptable range, the relay is automaticallyde-energized.

Fail Safe Applications

By appropriate connection to the double-throw relay contacts it is possible to obtain either acontact closure or a contact opening for an energized relay. The de-energized relay then

INSTALLATION


provides a contact opening or contact closure, respectively. It is important for fail safeapplications that the user understand what circuit conditions are desired in event of powerfailure and the resultant relay de-energized. Relay contacts should then be connectedaccordingly.

FIGURE 2-2. CONNECTIONS FOR POTENTIOMETRIC RECORDER WITH NON-STANDARDSPAN

FIGURE 2-3. TYPICAL EXAMPLE OF OXYGEN MONITOR CONNECTED IN SERIES WITHSEVERAL CURRENT-ACTIVATED DEVICES

Position of RecorderOutput Selector Plug

Minimum PermissibleResistance for R1 + R2

Output Cable fromOxygen Monitor

PotentiometricRecorder

InputTerminals

(Verify polarity is correct)Voltage Divider

(Customer Supplied)

R1

R2

10 mV100 mV

1 V5 V

1K Ohm10K Ohm

100K Ohm2K Ohm

Recorder

Controller

OxygenMonitor

RemoteIndicator

+

-

+

-

+

-

+

-

mA

INSTALLATION


2.2 MODEL 7001D SENSOR MOUNTING KITSThe kits in this section are supplied without a sensor. The sensor is ordered separately.The information in this section is for reference only and is superceded by any instructionssupplied with the kits.

2.2.1 IN-LINE FLOW KIT PN 639900Used with rechargeable sensor PN 623245, this kit is designed for ppb level dissolvedoxygen in water applications. The sample enters the chamber through a nozzle andimpinges directly on the sensor membrane for fast response, then discharges atatmospheric pressure. Nominal flow is 250 to 500 cc/min. See Figure 2-4.

Outline and mounting dimensions of the sensor installed in the in-line flow kit are shown inFigure 2-5. To install the flow chamber and sensor, refer to the directions appropriate to theapplication.

FIGURE 2-4. RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT 639900 –SECTIONAL VIEW

FIGURE 2-5. RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT 639900 – OUTLINEAND MOUNTING DIMENSIONS

1/2NPT Sample Outlet

1/4NPT Sample Inlet

2.8[73.0]

5.3[134.8]

Chamber Assembly627866

Clamp, Mounting631152

Clamp 866467

Adapter 193523

Rechargeable Sensorw/Gland 623245

Sensor Cable

INSTALLATION


Siphon Breaker

Sample Outlet Line

Sensor CableSample

Outlet

2.2.1.1 Monitoring Boiler Feedwater, High-Purity Water, or Deaerated SeaWaterThe flow chamber may be mounted behind the panel of a water quality system, or near thesample point. A typical panel-mounted installation is shown in Figure 2-6.

Orientation

Mount flow chamber horizontally with outlet port facing upward. This ensures that any gasbubbles are purged rapidly upon startup and prevents entrapment of gas bubbles on thesurface of the sensor membrane during operation.

Siphon-Breaker

A siphon-breaking vent should be installed in the outlet line so that the flow chamber willremain full of water even during system shutdown.

Sample Temperature

Although automatic temperature compensation is provided, for best accuracy the flowchamber should receive sample that has been temperature-conditioned to 25°C ±1°C. Ifthis is not possible, use a sample with temperature held constant to ±5°C. Figure 2-7Ashows a suggested installation with constant temperature sample conditioning. Figure 2-7Bshows a suggested installation without this feature.

FIGURE 2-6. IN-LINE FLOW KIT 639900 - TYPICAL PANEL-MOUNTED INSTALLATION

INSTALLATION


Cooling Water

Inlet BlockValve

“Roughing”Cooler

Filter

PressureReduction

PressureReliefValve

GrabSampleValve

TemperatureControlled

Cooling Water

“Conditioning”Sample Cooler

TemperatureGauge

Flowmeter WithNeedle Valve

To Drain

Tee and TubingSiphon Breaker

Flow Chamber Outlet –Orient Vertically

Sensor Cable toAmplifier Module

Sensor in Flow Chamber –Orient Vertically

To Drain

SAMPLING SYSTEM

FLOW CHAMBER AND SENSOR INSTALLATION

Cooling Water

Inlet BlockValve

“Roughing”Cooler

Filter

PressureReduction

PressureReliefValve

GrabSampleValve

TemperatureGauge

Flowmeter WithNeedle Valve

To Drain

Tee and TubingSiphon Breaker

Flow Chamber Outlet –Orient Vertically

Sensor Cable toAmplifier Module

Sensor in Flow Chamber –Orient Vertically

To Drain

SAMPLING SYSTEM

FLOW CHAMBER AND SENSOR INSTALLATION

A. With Constant-Temperature Sample Conditioning

B. Without Constant-Temperature Sample Conditioning

FIGURE 2-7. IN-LINE FLOW KIT 639900 - TYPICAL POWER PLANT INSTALLATIONS

INSTALLATION


2.2.1.2 Monitoring Deoxygenated Brine for Oil Well FloodingA typical sampling system is shown in Figure 2-8. Sample for the flow chamber is obtainedvia a tap in the piping on the discharge side of the flooding pump. A needle valve is used toregulate sample flow. Installation of a flow meter in the sample line is usually impracticalbecause of the coating problem. Instead, flow is measured by allowing the discharge fromthe chamber to flow into a graduated cylinder for a timed interval. Recommended flow ratein this application is approximately 500 ml per minute.

FIGURE 2-8. IN-LINE FLOW KIT 639900 - TYPICAL INSTALLATION FOR OIL WELLFLOODING

LOW

SET PT SET PT

LOW

Oxygen Monitor

To Waste

Flooding Pump

¼” Tubing

¼” NeedleValve

Sensor and FlowChamber – OrientHorizontally

Monitor

Flow ChamberOutlet – OrientVertically

INSTALLATION


Grommet/Plug

Adapter

Nut

Gasket

Cable

2.2.2 SUBMERSION KIT PN 623712For use with a non-rechargeable oxygen sensor (PN 623740) for liquid phase oxygenmeasurements. It is intended for use when the liquid phase sensor is to be inserted througha vessel wall as in the monitoring of a process vessel head space or when a large diameterprocess is being monitored directly by insertion of the sensor through the pipe. See Figure2-11.

Installation of Sensor and Submersion Assembly

Refer to Figure 2-9.

1. Remove the knurled nut from the submersion adapter.

2. Feed the non-connector end of the cable through the adapter so that the cable entersthe wide opening of the adapter and exits the narrow opening.

3. Pull the cable almost all the way through the adapter. Allow six or eight inches of thecable with connector to extend from the wide opening of the adapter. This will provideworking space when installing the sensor.

4. Install the gasket on the connector side of the sensor. Press it snugly against the flangeon the sensor.

5. Connect the cable to the sensor using the threaded mating connectors. Hand tighten.

6. Pull gently on the non-connector end of the cable to seat the sensor in the adapter.

7. Replace and hand tighten the knurled nut on the wide end of the adapter.

FIGURE 2-9. NON-RECHARGEABLE SENSOR WITH SUBMERSION KIT 623712 –SECTIONAL VIEW

INSTALLATION


8. Install the blue silicone rubber plug on the non-connector end of the cable and move itup to the adapter.

9. Hold the cable firmly and seat the plug in the adapter to form a seal.

10. Crimp cable lugs to wires at end opposite connector.

11. Connect the cable lugs to the terminal strip on the power supply board in the instrument.Refer to Section Two of the instruction manual.

The submersion assembly is now ready to be connected to 3/4 inch pipe in a mannerdictated by the local installation requirements.

Protection of Sensor Cable

In permanent installations the sensor cable is normally routed through a customer-suppliedconduit, which screws into the 3/4 inch NPT connection at the end of the submersionassembly.

Operating Pressure: Maximum operating pressure is 50 psig (345 kPa).Mounting and Orientation: See Figures 2-10, 2-11.

FIGURE 2-10. NON-RECHARGEABLE SENSOR WITH SUBMERSION KIT 623712 –OUTLINE AND MOUNTING DIMENSIONS

1-11 1/2NPT

5.7[146]

1.0[25] 2.3

[57]

2.0[51]

INSTALLATION


FIGURE 2-11. NON-RECHARGEABLE SENSOR SUBMERSION KIT 623712 – TYPICALINSTALLATION

Cable to Oxygen Monitor

DiffuserChain toDeck Level

Sensor/Submersion Assembly

Pipe and fittings to suitinstallation.

Handrail

Capped Pipe Clamped toHandrail

Union (loose to act asswivel)





Manhole

A. TYPICAL INSTALLATION OF SENSOR DURING PLANT CONSTRUCTION

B. TYPICAL INSTALLATION OF SENSOR IN EXISTING PLANT

INSTALLATION


2.2.3 IN-LINE FLOW KIT PN 623711Designed for use with non-rechargeable oxygen sensor (PN 623740) when a flowing liquidstream with discharge of the effluent from the flow chamber at atmospheric pressure isbeing measured. This requirement means that upstream sample pressure reduction mustbe performed on the process sample from a pressurized source before it is presented to theflow chamber for analysis by the sensor. Sample input flow rate should be selected in therange of 50 to 100 cc/min and care must be taken with downstream pressure drops toprevent back pressurization of the sensor.

Installation of Sensor and In-Line Flow Kit

Refer to Figure 2-12.1. Remove the knurled nut on the flow chamber.2. Mount the sensor in the flow chamber. Place the end opposite the connector into the

cavity of the flow chamber. The sensor, when installed in this manner, seats with its faceagainst an o-ring in the bottom of the chamber to form a seal.

3. Replace the nut on the flow chamber. Hand tighten.4. Connect the cable to the sensor using the threaded mating connectors.5. Crimp cable lugs to wires at end opposite connector, if needed.6. Connect the cable wire or lugs to the terminal strip on the power supply board in the

instrument. Refer to Section Two of the instruction manual.

The in-line flow chamber/sensor assembly is now ready for installation in the sample.

FIGURE 2-12. NON-RECHARGEABLE SENSOR WITH IN-LINE PRESSURECOMPENSATION KIT 623711 – SECTIONAL VIEW

Mounting the Flow Chamber

Refer to Figures 2-13 and 2-14. The preferred mounting configuration of the sensor is withthe electrical connector at the top of the flow chamber/sensor assembly. Operation in thehorizontal plane is also possible. To facilitate mounting the flow chamber to a bench

Cable

Fitting (2 ea.)Male Connector1/8T - 1/8MPT SS

O-Ring

Nut

Fitting, Plug1/8MPT SS

Flow Chamber

INSTALLATION


.7[17]

10-32 x 1/2" DP2 Places

2.5[64]

2.1[54]

4.8[122]

2.6[67]

3.8[97]

5.2[133]

.2 [5] DIA

.7[18]

.5[12]

.2[5].3

[8]

.1[2]

2 Holes

1.1[28]

.5[13]

Bracket MountingHardware (2 ea.):Screw 10-32 x 5/8Lock Washer No. 10Flat Washer No. 10

surface, wall or pipe, employ the universal-mounting bracket included as part of the kit. Theflow chamber has one port that should be capped off with the fitting cap supplied in the kit.The port to be capped is determined by the user, depending on the particular application.

FIGURE 2-13. NON-RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT 623711 –OUTLINE AND MOUNTING DIMENSIONS

INSTALLATION


FIGURE 2-14. NON-RECHARGEABLE SENSOR WITH IN-LINE PRESSURECOMPENSATION KIT 623711 – TYPICAL INSTALLATION

SampleIn

SampleIn

ToDrain

orProcess

ToDrain

orProcessPreferred orientation

of In-Line FlowAssembly

Preferred orientationof In-Line FlowAssembly

Liquid Gas

INSTALLATION


2.3 MODEL 7002D SENSOR INSTALLATION KITSThe information in this section is for reference only and is superceded by the instructionssupplied with each kit.

2.3.1 SUBMERSION KITS 639901(POLYPROPYLENE) AND PN 646626 (RYTON)Used with rechargeable sensor PN 623245 (polypropylene) or PN 190404 (Ryton), this kitpermits placing the sensor in a tank, open channel, or stream.

Construction

Refer to Figure 2-15. The submersion assembly consists of a cylindrical chamber and anadapter ring, held together by a snap-on ring clamp. When the sensor is installed within thesubmersion assembly, sealing is made by the integral gland on the sensor body (Figure 1-4).

FIGURE 2-15. RECHARGEABLE SENSOR WITH SUBMERSION KIT 639901 OR 646626– SECTIONAL VIEW


In a permanent installation the sensor cable is normally routed through a user-suppliedconduit which screws into the 3/4-inch NPT female connection on the submersion assembly.

In applications where the sensor cable is not housed in conduit, a cable connectoraccessory (PN 856831; Figure 2-15) is required with liquid sample streams. This separatelyordered item provides a watertight seal to prevent leakage around the cable. The aluminumconnector includes a compression nut and inner sealing grommet.

Sample Pressure and Flow Rate

Maximum permissible operating pressure is 50 psig (345 kPa), equivalent to a water depthof approximately 100 feet (approximately 30 m). Velocity of the liquid flow past the sensortip must be at least 1.5 feet per second (0.45 m/sec) for flow-independent oxygen readout.

Chamber

Ring Clamp

Adapter Ring

SubmersionAssembly

Cable Connector (Accessory)PN 856831

INSTALLATION


Mounting and Orientation of Submersion Assembly

Outline and mounting dimensions are given in Figure 2-16. The submersion assemblyshould be mounted in a horizontal position, as in Figure 2-17. This orientation places thesensor membrane in vertical position, which prevents entrapment on the membrane of gasbubbles that could cause erroneous oxygen readings.

One of the principal applications of the submersion assembly is use in wastewater treatmentaeration tanks. In this application the most satisfactory location is at the side of the aerationtank, either on the diffuser side or on the opposite side. Most installations are made withthe sensor located above the diffuser. Because air bubbles or debris could become trappedon the active area of the electrode, the sensor (which is not position sensitive) should bemounted at right angles to flow. Installations made in this way have given many months ofcontinuous service with the only operating requirement being an occasional calibrationcheck.

For installations made during plant construction, a swing-arm piping arrangement installedin the side of the tank has proven satisfactory. The sensor cable is led from the sensorthrough the supporting pipe. A junction box located in a manhole on the deck beside theaeration vessel may be included optionally to facilitate pulling of the cable, Permanentlyinstalled conduit carries the sensor cable to the amplifier, which may be located asconvenient. Figure 2-18 illustrates a typical installation.

The oxygen monitor may be readily installed in existing plants. It is only necessary tosecure the supporting pipe to a handrail, if available, or onto the deck beside the tank. Theamplifier may be installed near the sensor or it may be located in a control room or in asheltered location. Recorder output can be transmitted via conduit to any location in thetreatment plant. Figure 2-19 shows a suggested method of installation using a handrail toprovide support for the sensor. Since varying plant conditions must be taken into account,no further recommendations are made.

FIGURE 2-16. RECHARGEABLE SENSOR WITH SUBMERSION KIT 639901 OR 646626– OUTLINE AND MOUNTING DIMENSIONS

1.9[48]

7.4[187]

3.4[86]

2.0[51]

2.9[73]

3/4 - 14 NPT

INSTALLATION


Internal Sensor membranevertical

Submersion Assembly horizontal

Customer supplied 3/4 inch pipe

Sensor Cable to Oxygen Monitor

1. Preferred orientation in liquid sample stream.2. Orientation in gaseous sample may be either horizontal or vertical.

FIGURE 2-17. RECHARGEABLE SENSOR WITH SUBMERSION KIT 639901 OR 646626– PREFERRED MOUNTING ORIENTATION

FIGURE 2-18. RECHARGEABLE SENSOR WITH SUBMERSION ASSEMBLY 639901 OR646626 – TYPICAL INSTALLATION DURING PLANT CONSTRUCTION

Cable to OxygenMonitor

Submersion Assembly

Chain toHandrail

Handrail

Diffuser

Pipe and fittings to suit installation

Union (loose to act as swivel)

Capped pipe clamped to handrail

INSTALLATION


FIGURE 2-19. RECHARGEABLE SENSOR WITH SUBMERSION ASSEMBLY 639901 OR646626 – TYPICAL INSTALLATION IN AN EXISTING PLANT

Cable to OxygenMonitor

Submersion Assembly

Chain to DeckLevel

Manhole

Diffuser

Pipe and fittings to suit installation

INSTALLATION


Gland

Adapter Ring

Clamp

Flow Chamber

Sample Inlet/Outlet1/2 NPT Female

2.3.2 IN-LINE FLOW KITS PN 639902 (POLYPROPYLENE) AND PN 646627(RYTON)

Used with rechargeable sensor PN 623245 (polypropylene) or PN 190404 (Ryton), this kitincludes an in-line, pressure-compensated flow assembly that permits mounting the sensorin a variable-pressure sample stream, at pressures up to 50 psig (345 kPa). The typicalapplication is in-line monitoring, with the flow assembly plumbed into the process-streampipeline. An alternative application involves discharge to atmospheric pressure where highdischarge rates are desired.

Construction

Refer to Figure 2-20. The flow assembly consists of a flow chamber and a adapter ring,held together by a stainless steel clamp. When the sensor is installed within the flowassembly, sealing is made by the integral gland on the sensor body (Figure 1-4).

FIGURE 2-20. RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT PN 639902 OR646627 – SECTIONAL VIEW

INSTALLATION


Sample Inlet/Outlet1/2 NPT Female

4.5[127]

4.0[102]

3.5[89]

Mounting Holes.219 [6] DIA

.75[19]

Mounting and Orientation

Outline and mounting dimensions are given in Figure 2-21. The assembly should bemounted so as to place the sensor in a horizontal position, as in Figure 2-22. Here, sampleenters the lower port of the assembly and discharges from the ' upper port. This ensuresthat during startup any gas in the flow chamber or any entrained gases in the samplestream will be purged rapidly, thus preventing entrapment of gas bubbles on the surface ofthe sensor membrane.

FIGURE 2-21. RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT PN 639902 OR646627 – OUTLINE AND MOUNTING DIMENSIONS

INSTALLATION



Maximum pressure is 50 psig (345 kPa). Flow rate limits are 5 gallons (20 liters) perminute, maximum, and 1.5 gallons (6 liters) per minute., minimum.

FIGURE 2-22. RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT PN 639902 OR646627 – PREFERRED ORIENTATION

Sample In To drain or processstream

INSTALLATION


2.3.3 45°°°° SUBMERSION KIT PIN 639903Used with rechargeable sensor 635747 (Figure 2-23), this configuration was originallydesigned for use with the UNOX process for secondary treatment of sewage, developed bythe Linde Division of Union Carbide Corporation. The method involves introduction of pureoxygen into wastewater in a closed-tank system. It is intended for use when the liquidphase sensor is to be inserted through a vessel wall as in the monitoring of a process vesselhead space or when a large diameter process is being monitored directly by insertion of thesensor through the pipe.

System characteristics impose certain special requirements:

3. Avoiding entrapment of bubbles on the sensor membrane is particularly important.Bubbles are pure oxygen, and thus would cause greater readout errors than the airbubbles present in conventional aeration systems. To minimize bubble entrapment,sensor membrane must be inclined at 45°. The sensor is functionally identical to thoseprovided in the other sensor kits, but differs physically. While the typical sensor has acylindrical body, the body of the special sensor incorporates a 45° elbow. Thus, with thesubmersion chamber mounted on the bottom of a vertical pipe (Figure 2-12A), thesensor membrane has the required 45° inclination.

4. The use of a closed tank imposes dimensional limitations on the sensor mountingarrangement. Design of the submersion assembly permits insertion of the sensor into aclosed tank through a vertical standpipe with minimum inside diameter of 6.0 inches/152mm. The standpipe has a flange seat at the top of the tank and extends downward intothe tank, below the liquid level.

FIGURE 2-23. 45°°°° RECHARGEABLE SENSOR WITH SUBMERSION KIT 639903 –SECTIONAL VIEW

¾ NPT

Chamber

Sensor with 45°Adapter

Clamp

INSTALLATION


Mounting and Orientation of Submersion Assembly

Outline and mounting dimensions are given in Figure 2-24. Figure 2-25 illustrates typicalinstallation in a UNOX system. The mixed-liquor tank is segmented into stages, with theentire multi-stage system closed to prevent loss of oxygen. Pure oxygen is admitted into thefirst stage and flows through successive stages, concurrent with liquid flow.

In each stage a dissolved oxygen monitor, with sensor submerged in the liquid, controls avariable-speed re-circulating compressor. The compressor intakes oxygen gas from theheadspace above the liquid, pumps it downward through the hollow shaft of an agitator, andsparge the liquid below the agitator blades.

Compared to conventional aeration processes, the mixed liquor contains a somewhat higherconcentration of suspended solids, and a considerably higher concentration of dissolvedoxygen, typically 0 to 10 parts per million by weight (mg/liter).

FIGURE 2-24. 45°°°° RECHARGEABLE SENSOR WITH SUBMERSION KIT – OUTLINE ANDMOUNTING DIMENSIONS

3/4 - 14 NPT

5.5[140]

9.3[237] 193662 Cable

(as ordered)

¾ Inch Pipe1.050 Inch (26.7mm)Customer Supplied

6 Inch (152mm)minimum I.D. PipeSchedule 40Customer Supplied

Flexible conduit required tofacilitate removal ofSensor/Submersion Assembly

Detail Per CustomerSpecifications

INSTALLATION


FIGURE 2-25. 45°°°° RECHARGEABLE SENSOR WITH SUBMERSION KIT – TYPICALINSTALLATION IN UNOX SYSTEM

Oxygen Monitor andassociated controlelements

Hollow-ShaftedAgitator/Spargers

Pure OxygenSettled Sewage

45° Oxygen Sensorwith Submersion Kit

Return Sludge

Variable SpeedRe-CirculatingCompressors

VentBases

ClarifiedEffluent

SecondarySedimentation

SludgePump

Waste Sludge

INSTALLATION


2.3.4 SUBMERSION KIT PN 623714Used with non-rechargeable sensor PN 623741, this kit is intended for use when the liquidphase sensor is to be inserted through a vessel wall as in the monitoring of a process vesselhead space or when a large diameter process is being monitored directly by insertion of thesensor through the pipe.

FIGURE 2-26. NON-RECHARGEABLE SENSOR WITH SUBMERSION KIT PN 623714 –SECTIONAL VIEW

Mounting Submersion Assembly

Refer to Figures 2-26 and 2-27. The sensor installs in the submersion assembly by placingthe doughnut shaped thin rubber gasket on the connector side of flange of the oxygensensor by gently slipping it over the sensor body and then connecting the cable to the cablesensor using the mating connectors. The end of the cable emerging from the threadedportion of the submersion assembly should then be gently pulled to seat the sensor withinthe receiving cavity of the submersion assembly. Now the cap should be placed over thefront end of the submersion assembly and then screwed down snugly. At this point the bluesilicone rubber plug has moved with the cable and is no longer seated in the threadedportion of the submersion assembly. Hold the cable securely and move the plug back intothe submersion assembly until it is firmly seated. The submersion assembly is now ready tobe connected to the 3/4 inch pipe in a manner dictated by the local installationrequirements. Typical installation is shown in Figure 2-28.

Grommet/Plug

Adapter

Nut

Gasket

Cable

INSTALLATION


FIGURE 2-27. NON-RECHARGEABLE SENSOR WITH SUBMERSION KIT 623714 –OUTLINE AND MOUNTING DIMENSIONS


In permanent installations the sensor cable is normally routed through a customer suppliedconduit, which screws into the 3/4 inch NPT connection at the end of the submersionassembly.

Operating Pressure: Maximum operating pressure is 50 psig (345 kPa). Mounting and Orientation: See Figures 2-27 and 2-28.

5.7[146]

1-11 1/2NPT

1.0[25] 2.3

[57]

2.0[51]

INSTALLATION


FIGURE 2-28. NON-RECHARGEABLE SENSOR WITH SUBMERSION KIT 623714 –TYPICAL INSTALLATION





Handrail

Capped Pipe Clamped toHandrail

Union (loose to act asswivel)





Manhole

A. TYPICAL INSTALLATION OF SENSOR DURING PLANT CONSTRUCTION

B. TYPICAL INSTALLATION OF SENSOR IN EXISTING PLANT

INSTALLATION


2.3.5 IN-LINE FLOW KIT PN 623713For use with non-rechargeable sensor 623741, this kit is designed for analysis of liquidoxygen samples, a flow chamber (PIN 622860) and associated nut (PIN 622368), auniversal mounting bracket (PIN 623200), a cable to connect the monitor to the sensor,installation instructions, and appropriate loose hardware. The PVC flow chamber isdesigned for use with a non- rechargeable oxygen sensor when a stream with discharge ofthe effluent from the flow chamber at atmospheric pressure is being measured. Thisrequirement means that upstream sample pressure reduction must be performed on theprocess sample from a pressurized source before it is presented to the flow chamber foranalysis by the sensor. Sample input flow rate should be selected in the range of 50 to 100cc/min and care must be taken with downstream pressure drops to prevent backpressurization of the sensor.

Installing the Sensor

The sensor is inserted into the flow chamber to form a face seal on the front of the sensorwith the O-ring present in the bottom of the flow chamber. The nut is then placed over theconnector end of the sensor and tightened hand tight to form a seal on the face of thesensor.

FIGURE 2-29. NON-RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT PN 623713– SECTIONAL VIEW

Cable

Nut

Fitting (2 ea)Male Connector1/8T – 1/8MPT SS

O-Ring

Fitting, Plug1/8MPT SS

Flow Chamber

INSTALLATION


FIGURE 2-30. NON-RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT PN 623713 –OUTLINE AND MOUNTING DIMENSIONS

10-32 x 1/2" DP2 Places

2.5[64]

2.1[54]

4.8[122]

2.6[67]

3.8[97]

5.2[133]

.2 [5] DIA

.7[18]

.5[12]

.2[5].3

[8] .7[17]

.1[2]

2 Holes

1.1[28]

.5[13]

Bracket MountingHardware (2 ea.):Screw 10-32 x 5/8Lock Washer No. 10Flat Washer No. 10

INSTALLATION


Mounting Flow Chamber

Refer to Figure 2-14. The preferred mounting configuration of the sensor is with theelectrical connector at the top of the flow chamber/sensor assembly. Operation in thehorizontal plane is also possible. To facilitate mounting the flow chamber to a benchsurface, wall or pipe, employ the universal mounting bracket included as part of the kit. Theflow chamber has one port that should be capped off with the fitting cap supplied in the kit.The port to be capped is determined by the user, depending on the particular application.

FIGURE 2-31. NON-RECHARGEABLE SENSOR WITH IN-LINE FLOW KIT 623713 –TYPICAL INSTALLATION

SampleIn

SampleIn

To Drainor

ProcessStream

To Drainor

ProcessStreamPreferred orientation of

In-Line Flow AssemblyPreferred orientation ofIn-Line Flow Assembly

Liquid Gas

INSTALLATION


2.3.6 EQUILIBRIUM SENSOR GUARD KIT PN 624741Used with equilibrium sensor PN 624750, a principal application for the guard assembly isuse in wastewater treatment aeration tanks. In this application, the most satisfactorylocation is at the side of the aeration tank, either on the diffuser side or on the opposite side.Most installations are made with the sensor located above the diffuser. Attach the sensor ina manner dictated by the local installation requirements to a 3/4-inch pipe.


Maximum permissible operating pressure is 50 psig (345 kPa) (Equivalent to a water depthof approximately 100 feet (30 m). Velocity of the liquid flow past the sensor tip must be atleast 0. 1 feet per second for flow-independent oxygen readout.

FIGURE 2-32. EQUILIBRIUM SENSOR WITH GUARD KIT 624741 – SECTIONAL VIEW

Adapter

Clamp

Guard

INSTALLATION



Outline and mounting dimensions are given in Figure 2-33. The guard assembly should bemounted in a horizontal position. This orientation places the sensor membrane in a verticalposition, which prevents entrapment on the membrane of gas bubbles that could causeerroneous oxygen readings.

FIGURE 2-33. EQUILIBRIUM SENSOR WITH GUARD KIT 624741 – OUTLINE ANDMOUNTING DIMENSIONS

6.5[165]

2.5[63.5]

INSTALLATION


2.3.7 EQUILIBRIUM SENSOR FAST RESPONSE KIT PN 624742Used with equilibrium sensor 624750, this kit is designed for use when a flowing liquidstream with discharge of the effluent from the flow chamber at atmospheric pressure isbeing measured. Sample input flow rate should be selected in the range of 2-5 cc/min. SeeFigures 2-34 and 2-35.

FIGURE 2-34. EQUILIBRIUM SENSOR WITH FAST RESPONSE KIT 624742 –SECTIONAL VIEW

Chamber

Clamp

Adapter

Sample Out

Sample In

Clamp

INSTALLATION


FIGURE 2-35. EQUILIBRIUM SENSOR WITH FAST RESPONSE KIT 624742 – OUTLINEAND MOUNTING DIMENSIONS

5.3[134.9]

1.9[48.3]

2.9[73.6]

1/2NPT

1/4NPT

2.9[73.7]

6.8[172.7]

INSTALLATION


2.3.8 IN-LINE KIT PN 624743 ( EQUILIBRIUM)Used with sensor 624750, this kit permits mounting the sensor in a variable pressure liquidsample stream, at pressures up to 50 psig (345 kPa). The typical application is in-linemonitoring with the flow assembly connected directly into the process stream pipeline. Analternative application involves discharge to atmospheric pressure where discharge ratesare high. See Figures 2-36 and 2-37.

FIGURE 2-36. EQUILIBRIUM SENSOR WITH IN-LINE FLOW KIT 624743 – SECTIONALVIEW

Adapter

Clamp

Flow Chamber

Sample Inlet/OutletSample Inlet/Outlet

INSTALLATION



Outline and mounting dimensions are given in Figure 2-37. For sample streams, it isrecommended that the assembly be mounted so the sensor is horizontal, Figure 2-38. Inthis orientation the sample enters the lower port of the assembly and discharges to theupper port. The horizontal arrangement ensures that during setup there will be immediatedischarge of any gas in the flow chamber or any entrained gases in the sample stream.

FIGURE 2-37. EQUILIBRIUM SENSOR WITH IN-LINE FLOW KIT 624743 – OUTLINEAND MOUNTING DIMENSIONS

4.5[127]

.8[19]

3.5[89[

4.0[102]

1/2NPTTYP

.219 [6] DIA2 PLC’S

INSTALLATION


FIGURE 2-38. EQUILIBRIUM SENSOR WITH IN-LINE FLOW KIT 624743 – PREFERREDORIENTATION

Sample In

To drain orprocess stream

INSTALLATION


NOTES

3STARTUP AND CALIBRATION


Prior to startup and calibration, familiarization with Figure 3-1 is recommended. This figuregives locations and brief descriptions of operating controls and adjustments on the displayboard.

3.1 SYSTEM STARTUP AND INITIAL CALIBRATION WITH AIRAfter completing installation procedure of Section Two, proceed as follows:

1. Select potentiometric output fullscale range by placing one slide of output/alarm switchS1 to ON position. For Model 7001D monitor, choices are 0 to 200, 0 to 100, and 0 to50 parts per thousand million (p 109), For Model 7002D Monitor, choices are 0 to 20, 0to 10, and 0 to 2 parts per million (p 106).

2. Select potentiometric output fullscale voltage by placing one slide of output/alarmswitch S1 to ON position. Choices are 0 to 1, 0 to 5, and 0 to 10 volts, fullscale.

3. Set alarm switches S4 and S5 to OFF position, to avoid activating either alarm beforesetpoints and deadbands have been adjusted (Section 3.3).

4. Turn line power ON.

5. Verify sensor membrane is dry. Expose sensor to ambient air at atmospheric pressure.If air temperature is above 80°F (26.7°C) and/or relative humidity is above 60%, usedry bottled or instrument air instead of ambient air.

6. Adjust current output range. Select 0 to 20 or 4 to 20 milliamperes to be minimumcurrent for isolated current output (if present).

a. Set RANGE switch S6 to CAL position.

b. With power OFF, disconnect anode and cathode leads from terminal strip TB2(Figure 3-1). Secure the leads so they will not contact any board or component.

c. Turn power ON, adjust residual ZERO control until potentiometric output deviceindicates 0 volts.

d. Set current output ZERO control R1 (on the Current Output Board, Figure 3-2), ifpresent, so current output device indicates the low range limit desired for theoutput range: 0 milliamperes or 4 milliamperes.

STARTUP AND CALIBRATION


e. Turn power OFF. If the sensor is rechargeable, connect a 10,000 ohm resistorbetween the anode and cathode terminals on terminal strip TB2. If the sensor isnot rechargeable, connect a 320,000 ohm resistor across these terminals, Thisresistor permits the polarizing voltage supply to provide a small current thatsimulates the sensor output signal.

f. Turn power ON, adjust CAL control clockwise to produce a fullscale reading onthe potentiometric output device.

g. Adjust current output SPAN control R2 (Figure 3-2) for reading of 20milliamperes on the current output device.

FIGURE 3-1. DISPLAY BOARD CONTROLS AND ADJUSTMENTS

LOW ALARM SWITCH S4

AUTO OFF ON

OUTPUT

E OUT

ALARM

OFF ONS1

0-10V

0-5V

0-1V

LOW ALARMDEADBAND ADJUSTR44

LOW ALARMSETPOINT ADJUSTR43

LOW ALARMINDICATOR LEDCR1

HIGH ALARMDEADBAND ADJUSTR41

HIGH ALARMSETPOINT ADJUSTR40

HIGH ALARMINDICATOR LEDCR2

CAL CONTROL R14AMPLIFIER ZERO R46 DISPLAY SPAN R24

RESIDUAL ZERO CONTROL R52

HIGH ALARMSWITCH S5

AUTO OFF ON

OPERATE/CALIBRATESWITCH S6

OUTPUT/ALARM/VOLTAGESWITCH S1

OUTPUT

E OUT

ALARM

OFF ONS1

0-10V

0-5V

0-1V

HEADER SOCKET J2

HEADER SOCKET J3

HEADER SOCKET J4



FIGURE 3-2. ISOLATED CURRENT OUTPUT BOARD

7. Air Calibration. Turn power OFF. Remove resistor from TB2. Re-attach anode andcathode wires from sensor to TB2. Turn power ON.

8. With RANGE switch S6 still in CAL position, wait for stable reading on the digitaldisplay, normally obtained in an hour or less after line power has been turned on.When stable reading is obtained, adjust CAL control to obtain display reading which isequal to the barometric pressure (disregard the decimal point) in mm Hg (1mm Hg =0.133 kPa).

Example:Normal sea-level barometric pressure is 760 mm Hg (101.04 kPa). With sensorexposed to air, CAL control is adjusted for display reading of 760 (disregard decimalpoint).

9. Sensor, Residual Current Zeroing: Each sensor has an individual residual, current thatmust be zeroed out by adjusting R52 (F16). The sensor is purged with nitrogen gasuntil a stable reading is obtained. Adjust R52 for a zero reading. This adjustment isrequired each time a new or recharged sensor is initially installed.1

Note:

For elevation appreciably different from sea-level, the required meter setting shouldbe determined from barometric reading (if available) or by calculation. As elevationincreases, barometric pressure decreases by approximately 25mm Hg (0.266 kPa) per1000 feet (305m).

1 Sensor will require a purge for nitrogen to zero-out its residual current. This is required each time a new or recharged

sensor is initially installed.

R1

R2

R4

R8

U6

OGI

U3

U2

1 2 3 4 I G O

C5

C4

C2U4

U5

IGO

C1U1 J1

R5 R6

R9 CR2

CR1

C3

R3

ZEROR1

SPANR2



10. At this point, preliminary calibration is complete.

Exact calibration of the Model 7001D Monitor as instructed in Section 3.2 isrecommended before the system is put into operation. However, the Model 7002DMonitor may be used, as is, for readout of parts per million dissolved oxygen in freshwater.

Refer to Section 3.3 for calibration of the Model 7002D for measurement in sea wateror brine, for calibration by chemical analysis, or for calibration for readout of dissolvedoxygen in percent of saturation.

Note:

The sensor should be re-calibrated approximately three hours after installation inwater. Subsequent re-calibration 24 hours after installation is also recommended.

11. Selection of alarm range, setpoints, and deadbands.

a. Select alarm fullscale range by placing one slide of output/alarm switch S1 in ONposition. Choices are 0 to 20, 0 to 10, and 0 to 2 parts per million.

b. The HI ALARM and LO ALARM setpoint potentiometers are adjustable from 0% to100% of the fullscale span. The potentiometers are graduated from 0 to 10.Required potentiometer setting for either setpoint adjustment is determined from theequation:

Required potentiometer setting = X 100

Example: (Model 7002D) fullscale span

alarm range: 0 to 20 p/106

desired Hi Alarm setpoint: 16 p/106

desired Lo Alarm setpoint: 10 p/106

required HI ALARM setting = X 10 = 80

required LO ALARM setting = X 10 = 50

Adjustment of Model 7001D is similar.

c. Select the desired deadband. The HI ALARM and LO ALARM deadbandpotentiometers are adjustable from 1% of fullscale (counterclockwise limit) to20% of fullscale (clockwise limit). Deadband is essentially symmetrical withrespect to the setpoint.

d. When setpoints and deadbands have been selected, set alarm switches S4 andS5 to the AUTO position, to activate the alarms.

e. To test external alarm devices, temporarily set alarm switch S4 or S5 to the ONposition. The associated alarm is then unconditionally on.

Desired alarm readingFullscale span

16201020



12. Install sensor in flow chamber.

13. Place RANGE switch at OP.



3.2 CALIBRATION OF MODEL 7001DAfter the sensor has stabilized, the instrument may be calibrated by a method appropriate tothe application: Section 3.2.1, calibration for measurement of dissolved oxygen inhigh-purity water; Section 3.2.2, calibration for measurement of dissolved oxygen indeaerated sea water; or Section 3.2.3, calibration for measurement of dissolved oxygen indeoxygenated brine for oil well flooding.

3.2.1 CALIBRATION FOR MEASUREMENT OF DISSOLVED OXYGEN IN HIGH-PURITY

WATER

The recommended calibration method for measurement of dissolved oxygen in high-puritywater involves indigo carmine analysis of a grab sample, taken without disturbing theinstrument system. Calibration should be performed only when the boiler is operating understeady-state conditions, not immediately after boiler startup, when sample oxygen contentmay be changing rapidly.

The CAL control should now be at very nearly the correct setting, as a result of the initial,approximate calibration with air performed during startup procedure of Section 3.1.However, if CAL control has inadvertently been moved out of adjustment, set it so thedisplay indicates the estimated dissolved oxygen content of the sample stream. Takesample for chemical analysis noting display reading at time sample is taken. Make analysisas soon as possible after sampling.

Note display reading. If unchanged from reading at time sample was taken, adjust CALcontrol so display reading agrees with analytical value obtained at time sample was taken.If display reading has changed during interim between sampling and calibration adjustment,use following equation to determine required display setting.

required display setting = = display reading at time ofcalibration

EXAMPLE:

display reading at time of sampling = 41 p/109

analytical dissolved oxygen = 29 p/109 DO2 = analytical dissolved O2

display reading at time of calibration = 35 p/109 Rc = reaction of display at time of calibration

required display setting = = 25 p/109 Rs = reading of display at time of sampling

Analytical dissolved O2

Display reading at sampling

29 x 3541



3.2.2 CALIBRATION FOR MEASUREMENT OF DISSOLVED OXYGEN IN DEAERATED SEA

WATER

Methods of analysis and calibration equipment for measurement of dissolved oxygen indeaerated sea water are described in publications available from the U.S. Department ofInterior, Office of Saline Water.

3.2.3 CALIBRATION FOR MEASUREMENT OF DISSOLVED OXYGEN IN DEOXYGENATED

BRINE FOR OIL WELL FLOODING

1. Make sure sensor membrane is dry. Expose sensor to ambient air at atmosphericpressure. If air temperature is above 80°F (26.7°C) and/or relative humidity is above60%, use dry bottled or instrument air instead of ambient air.

NOTE

Do not expose sensor to air for more than a few minutes. Prolonged exposure to thehigh concentration of oxygen present in air will result in an excessive recovery timefor equilibration to a low concentration of oxygen.

2. Set RANGE switch to CAL position.

3. Determine ratio of solubility of oxygen in water sample to solubility in fresh water.

EXAMPLE

The sample has approximately the same salinity as sea water at 77°F (25°C). FromFigure 3-3, it is determined that solubility ratio is:

= = 0.804

NOTE

With the Model 7001D, the curves of Figure 3-2 are used only to determine the ratio ofsolubility for use in CAL mode. The actual concentrations shown by the curves areseveral orders of magnitude beyond the normal operating range of the Model 7001D.

4. Multiply value determined in Step 3 by ambient barometric pressure in mm Hg (I mm Hg= 0.133 kPa). In the example given assume normal sea-level barometric pressure of760 mm Hg (101.04 kPa).

0.80 x 760 = 611

5. Adjust CAL control so reading on display is equal to the value determined in Step 4(disregard decimal point). In the example, the required reading is 611.

6. Install sensor in its permanent location and set RANGE switch to OP.

Solubility in sea waterSolubility in fresh water

6.748.38



FIGURE 3-3. SOLUBILITY OF OXYGEN IN WATER OF VARIOUS DEGREES OF SALINITY

30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 1054

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xygen, P

arts

-Per

-Mill

ion b

y W

eig

ht

(mg/li

ter)

Temperature °F

Note: Curves are for a total pressure of 760 mm Hg (101.3 kPa) and an oxygen partial pressure of 160 mm Hg (21.2 kPa). Under any other barometer pressure, P, the solubility may be obtained from the formula:

S⁄ = S = S = S

In which: S⁄ = Solubility at P, P⁄, or P⁄ ⁄

S = Solubility at 760 mm Hg, 29.92 in Hg, or 101.3 kPa P = Barometric pressure in mm Hg P⁄ = Barometric pressure in inches Hg P⁄ ⁄ = Barometric pressure in kPa

P760

P⁄

29.92P⁄ ⁄

101.3

Based on data from Standard Methods for theExamination of Water and Wastewater by APHA,AWWA, and WPCF

0 5 10 15 20 25 30 35 40

Temperature °C



3.3 CALIBRATION OF MODEL 7002DAfter the sensor has stabilized, the instrument may be calibrated by a method appropriate tothe type of sample and the desired readout units, as described in Section 3.3.1 through3.3.4.

SECTION CALIBRATION METHOD

3.3.1Measurements in Sea Water or Brine: Calibration with Air for Readout ofDissolved Oxygen in Parts per Million by Weight (mg/liter).

3.3.2 Calibration by Chemical Analysis for Readout of Dissolved Oxygen in Partsper Million by Weight (mg/liter).

3.3.3 Combination of Chemical Analysis and Air Calibration for Readout ofDissolved Oxygen in Parts per Million by Weight (mg/liter).

3.3.4 Calibration with Air for Readout of Dissolved Oxygen in Percent of Saturation.

3.3.1 MEASUREMENTS IN SEA WATER OR BRINE: CALIBRATION WITH AIR FOR

READOUT OF DISSOLVED OXYGEN IN PARTS PER MILLION BY WEIGHT

(MG/LITER).1. Make sure sensor membrane is dry. Expose dried sensor to ambient air at atmospheric

pressure. If air temperature is above 80°F (26.7°C) and/or relative humidity is above60%, use dry bottled or instrument air instead of ambient air.

2. Set RANGE switch at CAL position.

3. Determine ratio of solubility of oxygen in water sample to solubility in fresh water.

EXAMPLE

Sea water is to be measured at 77°F (25°C). Refer to Figure 3-2. The solubility ratio is:

4. Multiply value determined in step 3 by ambient barometric pressure in mm Hg (I mm Hg0. 133 kPa). In the example given assume normal sea-level barometric pressure of 760mm Hg (101.04 kPa).

0.804 x 760 = 611

5. Adjust CAL control so reading on display is equal to the value determined in step 4(disregard decimal point). In the example, the required reading is 611.

Solubility in sea waterSolubility in fresh water

0.8048.38=



6. Install sensor in its permanent location and set RANGE switch to OP.

NOTE

For waters which may vary between fresh and sea water, as in an estuary, highlyaccurate continuous readings cannot be obtained. For maximum accuracy, it isrecommended that air calibration be made as above except that solubility at 10,000ppm chlorine be used for the calibration. In the above example, at 77°°°°F (25°°°°C),maximum error would be about 10.7% of reading.

3.3.2 CALIBRATION BY CHEMICAL ANALYSIS FOR READOUT OF DISSOLVED OXYGEN

IN PARTS PER MILLION BY WEIGHT (MG/LITER)1. Expose sensor to sample stream, set RANGE switch to OP, and wait for display reading

to stabilize.

2. Adjust CAL control so display indicates estimated oxygen concentration of samplestream.

3. Take sample for chemical analysis, noting display reading at time sample is taken.Make analysis as soon as possible after sampling.

4. Note display reading: if unchanged from step 3, adjust CAL control so display readingagrees with analytical value obtained in step 3. If display reading has changed duringinterim between sampling and calibration adjustment, use following equation todetermine required display.

required display reading = x display reading at time ofcalibration

EXAMPLE

display reading at time of sampling = 8.38 parts per million by weight (mg/liter)

analytical dissolved oxygen = 7.00 parts per million by weight (mg/liter)

display reading at time of calibration = 8.00 parts per million by weight (mg/liter)

required display reading = x 8.00 = 6.68 ppm by weight (mg/liter)

Analytical dissolved O2

Display reading at sampling

7.008.38



3.3.3 COMBINATION OF CHEMICAL ANALYSIS AND AIR CALIBRATION FOR READOUT

OF DISSOLVED OXYGEN IN PARTS PER MILLION BY WEIGHT (MG/LITER)In certain industrial streams the effect of dissolved substances on oxygen solubility is notreadily determined. Typical examples are beer and wine, where solubility may bedecreased or increased by dissolved solids and alcohol. In such applications initialcalibration by a combination of the chemical analysis and air-calibration techniques willenable subsequent calibrations to be made faster and less laboriously than is possible bychemical analysis alone. Proceed as follows:

1. Initially, calibrate instrument as follows:

a. Calibrate instrument by chemical analysis, per Section 3.2.2.

b. Remove sensor from stream. Wipe sensor membrane dry. Expose sensor toambient air. If air temperature is above 80°F (26.7°C) and/or relative humidity isabove 60%, use dry bottled or instrument air instead of ambient air.

c. Set RANGE switch at CAL, allow display reading to stabilize, then note andrecord display reading for use in subsequent calibrations.

2. For subsequent calibrations, expose sensor to appropriate type of air (i.e., ambient orbottled). Set RANGE switch at CAL and adjust CAL control so display indicates valuenoted in Step 1c.

EXAMPLE

Determination of Dissolved Oxygen in Beer. Initial Calibration: Sensor is exposed tobeer and a sample is taken. By chemical analysis, dissolved oxygen concentration isdetermined to be 0.3 parts per million by weight (mg/liter).

CAL control is adjusted for reading of 0.3. Sensor is removed from beer; RANGEswitch is set at CAL and display reading of 7.22 is noted.

Subsequent Calibrations: Sensor is exposed to ambient air, RANGE Switch is set toCAL and CAL control is adjusted for display reading of 7.22.

3.3.4 CALIBRATION WITH AIR FOR READOUT OF DISSOLVED OXYGEN IN PERCENT

OF SATURATION

This method provides readout of dissolved oxygen as a percentage, expressed with respectto the oxygen concentration that the liquid sample would contain if fully air-saturated. Thebasis for the calibration is that air and air-saturated water have very nearly the same oxygenpartial pressure and sensor response. This is of particular value in the measurement of thedissolved oxygen content of organic liquids or complex mixtures for which no referenceoxygen solubility data exist.

1. Expose sensor to ambient air.



2. Place RANGE switch at CAL.

3. Adjust CAL control for display reading of 100 (disregard decimal point).

4. Install sensor.

5. The monitor now indicates dissolved oxygen content, in percent of saturation (disregarddecimal point). To convert this value into parts per million by weight (mg/liter), multiplyby the oxygen saturation value, as determined from Figure 3-2, for oxygen dissolved inwater. For oxygen dissolved in non-aqueous or industrial product supplies, multiply thepercent of saturation value by the actual saturation amount (mg/liter) which has beenobtained by an independent laboratory analytical documentation or from the literature.

4OPERATION


4.1 ROUTINE OPERATIONAfter startup and calibration, per Section Three, the monitor will automatically andcontinuously indicate the dissolved oxygen concentration in the sample.

4.2 FREQUENCY OF CALIBRATIONFor the first few days of operation, the instrument should be calibrated daily to compensatefor initial stabilization of the membrane in the sensor.

The service life of a non-rechargeable oxygen sensor is application dependent and norejuvenation or recharging is possible. It is difficult to determine the prospective life of anon-rechargeable sensor, since no time related failure mechanisms are apparent at thistime.

After the sensor has stabilized, an instrument in continuous operation should be calibratedat least once a week until the appropriate calibration interval is determined. A log ofperiodic calibrations helps establish desired calibration intervals for given applications.

In applications of the Model 7001D involving boiler feedwater or other high-purity water, therecommended method of checking calibration is by indigo carmine analysis of grab samplestaken without disturbing the instrument system. Refer to Section 3.2.1. The chemicalanalysis is, at best, accurate and reproducible only to within a fewparts-per-thousand-million. It is therefore a matter of judgment whether or not to adjust theCAL control when the instrument reading differs from the analytical value by only a fewparts-per-thousand-mil lion. A suggested rule-of-thumb is to readjust the CAL control only ifthe instrument reading and analytical value differ by more than 3 parts-per-thousand-million(p/109).

As an alternative to calibration of the Model 7001D by chemical analysis, the instrumentmay be calibrated by air, as was done initially during the startup procedure of Section 3.1.After the system is purged of oxygen, the RANGE switch is placed at CAL, and the sensor isremoved from the flow chamber. The sensor membrane is then dried by gentle wiping witha soft tissue, and exposed to ambient air. When a stable reading is obtained, the CALcontrol is adjusted so that reading on the digital display (disregarding the decimal point) isequal to the barometric pressure in mm Hg (1 mm Hg = 0.133 kPa). At normal sea-levelbarometric pressure the required display reading is 760, Immediately after adjustment of theCAL control, the sensor is reinstalled in the flow chamber and water flow is set at 250milliliters per minute.

OPERATION


NOTE

Do not expose sensor to air for more than a few minutes. A lengthier exposure to thehigh-level oxygen concentration present in air will necessitate an excessive recoverytime to retain low-level oxygen equilibrium.

4.3 FREQUENCY OF SENSOR RECHARGINGNominal useful life of a sensor charge is approximately three to six months. After that timethe sensor should be removed from the installation and recharged. Refer to Section 6.1.Physical damage to the membrane is the most frequent cause of failure for service periodsless than three months. Proper handling and installation of the sensor into the samplesystem are essential.

5THEORY


The Models 7001D and 7002D Oxygen Monitor Systems consist of an amperometricoxygen sensor and an amplifier unit, interconnected by a multi-conductor shielded cable.The sensor responds to the partial pressure of dissolved oxygen. The amplifier conditionsthe signal from the sensor, providing a readout of dissolved oxygen in appropriateengineering units.

This section describe the major factors involved in the measurement of the concentration ofdissolved oxygen. Section 5.1 describes the relevant electrochemical theory; Section 5.2describes practical aspects of the measurement.

5.1 ELECTROCHEMICAL THEORY

5.1.1 OXYGEN SENSOR (RECHARGEABLE OR NON- RECHARGEABLE)With the sensor placed in the process stream, a voltage is applied across the cathode andanode, See Figure 5-1. Oxygen in the process stream diffuses through the membrane andis reduced at the cathode, which results in a current flow proportional to the partial pressureof oxygen in the sample.

When oxygen is not present, essentially no electrical current flows in the sensor. A smallamount of residual current may flow in the sensor. This is unrelated to the external sampleoxygen concentration and may be suppressed by use of the sensor Zero adjustment on themonitor (R52). When oxygen is present, electrical current flows in the sensor according tothe characteristic oxygen curve for the particular potential applied to the electrodes. Themagnitude of the current depends upon the partial pressure of dissolved oxygen in thesample. This residual zeroing requires purging the sensor with nitrogen gas.

5.1.2 EQUILIBRIUM SENSOR

With the equilibrium sensor placed in the sample stream, oxygen diffuses through themembrane and is reduced at the cathode. Simultaneously an equal amount of oxygen isgenerated at the anode. The diffusion continues until the oxygen partial pressure on bothsides of the membrane is equal and a balance exists. External electrical circuitry isarranged such that the current necessary to maintain the equilibrium is converted to readoutthe dissolved oxygen concentration in the solution.

The reduction/oxidation equations are as follows:

Reduction Reaction at the Cathode: O2 + 4H+ + 4e- 2H2O

THEORY


Oxidation Reaction at the Anode: 2H2O O2 + 4H+ + 4e-

Since there is no net reaction, neither flow rate nor fouling affects the accuracy of thereading.

FIGURE 5-1. RECHARGEABLE OXYGEN SENSOR – SECTIONAL VIEW

5.2 PRACTICAL ASPECTS OF DISSOLVED OXYGENMEASUREMENT

5.2.1 VARIABLES WHICH INFLUENCE MEASUREMENT

Dissolved oxygen measurement is influenced by barometric pressure, humidity (during aircalibration), sample temperature, the presence of interfering gases, and composition of theliquid medium.

Barometric Pressure

Rate of oxygen diffusion through the sensor membrane, and therefore the sensor response,is linear with respect to oxygen partial pressure (assuming constant sample temperature).

At the normal sea-level barometric pressure of 760 mm Hg (101.04 kPa), the oxygen partialpressure for dry air is 160 mm Hg (21.2 kPa). As atmospheric pressure deviates from thestandard value, the oxygen partial pressure varies proportionally. Accordingly, the solubilityof oxygen in water varies in proportion to the change in the partial pressure of oxygen in air.Barometric pressure is therefore a significant factor in instrument calibration.

CABLECONNECTOR

THERMISTOR

BODY

FILL PORT

ANODE

O-RINGS

MEMBRANE CATHODE

CAP

THEORY


Humidity

In calibration for dissolved oxygen measurement, one method is to expose the sensor to agaseous sample, typically dry air, of accurately known oxygen content. The known gaseousoxygen concentration value is then related to a corresponding dissolved oxygen value.

Since dry air contains 20.95% oxygen by volume, regardless of barometric pressure, thepartial pressure of oxygen is directly proportional to the total barometric pressure, accordingto Dalton's law of partial pressures. Thus for dry air, if the total barometric pressure isknown, the partial pressure of oxygen can be computed.

However, this procedure is valid only for dry air. Humid air has the effect of reducing thepartial pressure of oxygen and the other gases in the air without affecting the totalbarometric pressure. Another way of expressing this relationship is by the followingequation:

P (atm) = P (gas) + P (oxygen) + P (water)

where

P (atm) = total barometric pressureP (gas) = partial pressure of all gases other than oxygen and water vaporP (oxygen) = partial pressure of oxygenP (water) = partial pressure of water vapor

Thus, for constant barometric pressure, if the humidity in the air is not zero, the partialpressure of oxygen is less than the value for dry air. For most measurements taken below80°F (26.7°C), the effect of water vapor may be ignored.

At a barometric pressure of 760 mm Hg (101 kPa), the partial pressure of oxygen in dry airis approximately 160 mm Hg (21.1 kPa).

To determine the partial pressure of oxygen in air at various levels of humidity andbarometric pressure, the partial pressure of water is subtracted from the total barometricpressure; the difference is multiplied by 20.95%.

EXAMPLE

barometric pressure = 740 mm Hg (98.5 kPa)partial pressure H20 = 20 mm Hg (2.7 kPa)partial pressure 02 = [740.20] x 0.2095 mm Hg

= 150 mm Hg (19.95 kPa)

Sample Temperature

Sample temperature affects sensor response in two ways:

1. Rate of Oxygen Diffusion through Sensor Membrane

THEORY


The rate of oxygen diffusion through the -sensor membrane varies with temperature,with a coefficient of about +3% per degree Celsius, causing a corresponding change insensor current. To compensate, the sensor incorporates a thermistor with negativetemperature coefficient. As sample temperature rises, thermistor resistance decreases,reducing the circuit gain, thus providing effective compensation within the range of 32°Fto 110°F (0°C to 44°C).

2. Solubility of Oxygen in the Liquid Medium

In an oxygen-saturated liquid, partial pressure of dissolved oxygen is equal to the partialpressure of oxygen in the atmosphere above the liquid. This relationship holds trueregardless of the oxygen concentration in parts pet thousand million by weight. Assample temperature increases, oxygen partial pressure remains unchanged (except asinfluenced by the vapor pressure of the liquid). However, the dissolved oxygenconcentration in parts per million by weight is reduced. To compensate for thesetemperature-dependent changes in oxygen solubility, the sensor incorporates a secondthermistor which adjusts the circuit gain.

Dissolved Interfering Gases

Gases that are reduced or oxidized at about 0.75 VDC, and thus contribute to sensorcurrent, may cause a readout error. Only a few gases have this characteristic. Commongases that should be avoided include SO2, CI2, and oxides of nitrogen. Low-levelconcentrations of hydrogen sulfide tend to contaminate the sensor, but do not seriously.affect dissolved oxygen measurement. If contaminated, the rechargeable sensor must berejuvenated by performing procedures given in Section 6. The non-rechargeable sensormust be replaced if contaminated.

Composition of the Liquid Medium

A significant change in the 'composition of the solution may change the solubility of oxygen.If the solvent is water, the addition of any water-soluble components, such as sodiumchloride, may change the dissolved oxygen concentration.

In any open equilibrium system, where a gas of constant oxygen partial pressure is in directcontact with a salt solution, the solubility of oxygen decreases as salinity increases. Thisdecreases the dissolved oxygen concentration in parts per million by weight, but does notaffect the partial pressure of oxygen in the solution. The oxygen monitor responds only tooxygen partial pressure, and thus fails to register the change in oxygen concentration.

5.2.2 INTERRELATION OF MEASUREMENT UNITS

Although the sensor responds to oxygen partial pressure, instrument readout for dissolvedoxygen is normally in other units, i.e., parts per thousand million or parts per million byweight (µg/liter or mg/liter), or percent of saturation. When the relationship between theseunits is clearly understood, the instrument may be calibrated for readout in units appropriateto the application.

In calibration for measurement of dissolved oxygen, one method is to expose the sensor toa gaseous sample, typically dry air, of accurately known oxygen content. The known

THEORY


gaseous oxygen concentration value is then related to a corresponding dissolved oxygenvalue.

Dry air is a gas mixture containing approximately 21% oxygen by volume, regardless ofbarometric pressure. Total pressure of any gas mixture is the sum of the partial pressuresof its various components. A change in the barometric pressure of dry air will not changethe percentage relationships of the various components, but will change the partialpressures and thus the instrument reading.

At normal sea-level barometric pressure of 760 mm Hg (101.04 kPa), the partial pressure ofoxygen in dry air is 160 mm Hg (21.3 kPa).

Note that x 100 = 21%

Most commonly, readout of dissolved oxygen is in parts per thousand million or parts permillion by weight (µg/liter or mg/liter respectively); refer to Section 5.3.1. Note, however,that in many applications readout in percent of saturation is more meaningful, since theconcentration of dissolved oxygen in a solution may vary with temperature. Refer to Section5.3.2.

5.2.3 READOUT OF DISSOLVED OXYGEN IN PARTS BY WEIGHT

In nearly pure water the Models 7001D and 7002D monitors provide direct readout ofdissolved oxygen in parts per thousand million and parts per million, respectively,Instrument readout closely matches tables given in the STANDARD METHODS FOREXAMINATION OF WATER by the American Health Association.

Figure 5-2 shows the effect of sample temperature on the solubility of oxygen inchloride-free water, when exposed to water-saturated air at a total pressure of 760 mm Hg(101.04 kPa) and an oxygen partial pressure of 160 mm Hg (21.3 kPa). If the total pressureis other than 760 mm Hg (101.04 kPa), a correction factor must be applied to the curve,according to the following equation:

S⁄ = S = S = S

760 29.92 101.04

where

S = Solubility at 760 mm H 29.92 in Hg, or 101.04 kPaS⁄ = Solubility at P, P⁄, or P⁄ ⁄

P = Barometric pressure in mm HgP⁄ = Barometric pressure in inches HgP⁄ ⁄ = Barometric pressure in kPa

If the water contains chlorides, reading should be corrected to match the tables given in theSTANDARD METHODS FOR EXAMINATION OF WATER for various degrees of salinity.Refer to Figure 3-3.

160760

P760

P⁄

29.92P⁄ ⁄

101.04

THEORY


FIGURE 5-2. SOLUBILITY OF OXYGEN IN AIR-SATURATED WATER AS A FUNCTION OFTEMPERATURE

5.2.4 READOUT OF DISSOLVED OXYGEN IN PERCENT SATURATION

In some applications involving the Model 7002D the dissolved oxygen concentration, inparts per million by weight (mg/liter), may vary appreciably because of temperaturevariations. In such applications, readout in percent of saturation may be more meaningful.This method provides readout of dissolved oxygen as a percentage of the oxygenconcentration that the liquid sample would contain if fully air-saturated.

In an oxygen-saturated liquid, the partial pressure of dissolved oxygen is equal to the partialpressure of gaseous oxygen in the atmosphere in contact with the liquid. As sampletemperature increases, dissolved oxygen concentration in parts per million by weight(mg/liter) is reduced. However, the liquid is still oxygen-saturated. At high temperatures itmay be necessary to consider the partial pressure of the evaporated liquid.

Curves similar to those in Figures 3-3 and 5-2 may be used to show the relationshipbetween dissolved oxygen concentration in parts per million by weight (mg/liter) and solutiontemperature for an oxygen-saturated solution. Similar curves may be plotted for liquids atless than 100% of saturation. Curves may also be plotted for various sample temperatures,

°F 32 41 50 59 68 77 86 95 104 113 122

6

8

10

12

14

Dis

solv

ed O

xygen in

Par

ts-P

er-M

illio

n b

y W

eight (

mg/li

ter)

Note: Curve is for a total pressure of 760 mm Hg (101.3 kPa) Under any other barometer pressure, P, the solubility may be obtained from the formula:

S⁄⁄⁄⁄ = S = S = S

In which: S⁄⁄⁄⁄ = Solubility at P, P⁄, or P⁄ ⁄

S = Solubility at 760 mm Hg, 29.92 in Hg, or 101.3 kPa P = Barometric pressure in mm Hg P⁄⁄⁄⁄ = Barometric pressure in inches Hg P⁄⁄⁄⁄ ⁄⁄⁄⁄ = Barometric pressure in kPa

P760

P⁄⁄⁄⁄

29.92P⁄⁄⁄⁄ ⁄⁄⁄⁄

101.3

°C 0 5 10 15 20 25 30 35 40 45 50

Liquid: Chloride-Free Water

THEORY


showing the linear relationship between percentage saturation and dissolved oxygenconcentration in parts per million by weight (mg/liter).

THEORY


NOTES

6SENSOR MAINTENANCE


6.1 RECHARGEABLE SENSORSMost routine maintenance involves the sensor. Sensor maintenance consists of periodicrecharging and cleaning, or rejuvenating the sensor cathode. The usual indication that thesensor requires rejuvenation and recharging is that during calibration the correct upscalereading is unobtainable by adjustment of the CAL control. Normally, the inability tocalibrate is preceded by a gradual, day-to-day reduction in sensor output, with a resultantlower instrument indication. The rate of reduction increases with the increase in internalresistance of the sensor. Other indicators of need for rejuvenation may be sluggishresponse or the presence of an appreciable residual signal when the sensor is exposed to azero reference sample.

NOTE

If sensor is disassembled for inspection, it must be recharged utilizing a newmembrane.

Normally, the sensor should be recharged with fresh electrolyte at three-month intervals.However, the interval may be extended, depending upon the application in which the sensoris used. In general, correcting a low output can be accomplished by recharging with freshelectrolyte, as described in Section 6.1.1. If output still remains low, or the other symptomsexist, the cathode should be rejuvenated as described in Section 6.1.2.

In event of "spiking," i.e., non-oxygen-related transient response, the cell separator kit (PN637538) is recommended. Refer to Section 6.1.2.1.

6.1.1 RECHARGING SENSOR

Note

This recharging procedure is superceded by any instructions supplied with therecharge kit(s).

The sensor must be removed from the process installation and disconnected from thesensor cable for recharging.

A recharging kit PN 191755 (equilibrium sensor; PN 624735) provides electrolyte,membranes, pressure-compensating rubber diaphragms, O-rings for the membraneretainer, 0-rings for the sensor body, and washers for the diaphragms.

SENSOR MAINTENANCE


To recharge sensor:

1. Unscrew knurled cap from end of sensor body. Remove membrane assembly,consisting of membrane fixed between holder and retainer, (Figure 6-1). Empty allelectrolyte from sensor. Flush sensor with distilled or deionized water to remove allparticulate matter.

2. Place a piece of adhesive tape over the breather hole in the pressure compensationdiaphragm port (not slotted plug). Refer to Figure 6-1.

3. Examine cathode for:

a. Staining or uneven coloration, which indicates that the cathode should berejuvenated as described in Section 6.1.2.

b. Any deposited material, typically white to gray, present in or around the groovesin the plastic surrounding the cathode. This must be removed to ensure bestoperation. Most of these deposits are water-soluble and may be removed by awater jet from a squeeze bottle. Any insoluble deposits in the annular andchannel grooves may be removed with a toothpick, however, care must be usedto avoid deforming the grooves.

4. Disassemble the membrane assembly. This consists of a plastic membrane and threeassociated parts: a holder, a retainer, and 0-ring. Remove retainer from holder byplacing finger into center hole of holder and pressing fingernail against inner edge ofretainer. Remove and discard the old membrane.

5. Verify that 0-ring is properly positioned in associated groove in holder as shown inFigure 6-1.

6. Holding a single membrane by the edges only, place it across membrane holder andsnap retainer in place (Figure 6-1). Membrane is now fixed in proper position, betweenholder and retainer.

Never touch center area of membrane with fingers. Membranes are easilycontaminated with foreign substances. Contaminated membranes causedrifting or erratic readings.

7. Using a sharp razor blade, carefully trim away excess membrane around edge ofmembrane assembly. Ensure that razor blade does not cut into edges of membraneassembly.

8. Set sensor body on a flat surface, with cathode facing upward. Verify that 0-ring ingroove at end of sensor body, Figure 6-1, is properly positioned around cathode. Pourthe electrolyte over the cathode/central post assembly so that it runs down into thesensor electrolyte well. Fill the well to a level flush with the top of the sidewall.

! CAUTION: MEMBRANE CONTAMINATION

SENSOR MAINTENANCE


Put the membrane assembly directly onto the cathode so that the face of the holder(i.e., the part with the larger-diameter central hole) fits against the 0-ring in the end ofthe sensor body.

The membrane is now in place. It will spread any electrolyte remaining on the cathodeinto a thin film that wets the entire surface. The membrane assembly should now becentered over the cathode.

9. While not to disturbing the central orientation of the membrane assembly, carefullyplace the cap on the sensor body. Screw the cap on, finger-tight only. Now lay thesensor on its side, with the side port up. Remove side port screw, rubberpressure-compensating diaphragm, and washer. Add electrolyte, if necessary, to bringthe level into the side port and then rock the sensor from end to end to remove any airpockets. Add electrolyte, if necessary to bring the level even with the shoulder. Withthe side port still facing up, tighten the cap further until it is snug, and the membrane isstretched taut across the cathode. Any excess electrolyte displaced from theelectrolyte well into the side port may now be removed by blotting with a tissue.

10. Insert new rubber diaphragm into side port, place new washer over diaphragm, andsecure with side port screw. Do not over-tighten screw.

11. Inspect sensor for possible leaks or damage to membrane.

12. Remove the adhesive tape installed in Step 2 from the pressure compensation port.

Sensor is ready for operation. Connect cable. If sensor does not operate properly refer toSection 7.2.

If normal operation is not obtained with the specified recharging, perform rejuvenation asdetailed in Section 6.1.2.

FIGURE 6-1. OXYGEN SENSOR – EXPLODED VIEW

Cap

Retainer

Membrane

O-Ring

Holder

O-Ring

ElectrolyticWell

CompensatorHolder

Sensor Body

Side Port

Rubber Diaphragm

Nylon Washer

Side PortScrew/Cap

GoldCathode

SENSOR MAINTENANCE


6.1.2 REJUVENATING CATHODE

If simple recharging does not correct symptoms of low output, clean and/or rejuvenate thecathode as follows:

Concentrated nitric acid is used in the following procedure. This material ishighly corrosive. Proper precautions should be taken to avoid contact with skin,eyes, clothing, and precision instrument parts. Use rubber gloves and eyeprotection.

1. Disassemble sensor. Remove cap and membrane assembly. Discard the usedelectrolyte. Flush the sensor with distilled or deionized water to remove all particulatematerial.

2. Over a sink, use a cotton swab to treat the cathode with concentrated reagent gradenitric acid, obtainable from a laboratory supply house. The end of the swab should bedipped under the surface of the nitric acid until it is saturated. Excess acid should bedrained from the swab by exerting pressure against the container wall. The cathodearea should be swabbed lightly for a five minute period with the nitric acid saturatedswab.

Care should be taken to confine the nitric acid to the button area. Only a thin film ofnitric acid should be present on the surface of the cathode during the cleaningoperation. Excessive application may result in the destruction of the epoxy annulussurrounding the button, with resultant sensor failure.

3. Rinse the button and sensor cavity thoroughly with distilled or deionized water. Thenrinse the sensor with electrolyte (PN 192580) by pouring it over the cathode into thesensor cavity until it is filled. Discard this electrolyte.

4. Recharge the sensor in the normal fashion.

If normal operation is not obtained with the specified rejuvenation procedure, the sensor isdepleted and must be replaced.

! WARNING: HAZARDOUS CHEMICAL

SENSOR MAINTENANCE


6.1.2.1 Cell Separator Kit (PN 637358)The cell separator is used to eliminate "spiking," i.e., non-oxygen-related transient responseon the analyzer output. This condition is usually caused by reaction products which sloughoff the anode and are transported to the cathode surface, where they are reduced. Duringreduction, the anode accepts electrons, resulting in the undesired transient response.

The condition may be corrected by installing a separator disk which mechanically separatesthe cathode and anode. This disk is available in package of ten (PN 637358).

To install the separator in an unfilled oxygen sensor, remove the cap and membrane holder,pour out the electrolyte, and position the hole in the separator over the cathode post. Then,gently push the separator down into the sensor body until it rests on top of the anode. Fillthe sensor with fresh electrolyte and reassemble in the conventional manner.

FIGURE 6-2. LOCATION OF CELL SEPARATOR IN OXYGEN SENSOR

6.2 NON-RECHARGEABLE SENSORSThe non-rechargeable sensor has no user accessible internal parts. No sensormaintenance is possible other than gentle brushing to remove deposits on the face of thesensor to restore its sensitivity and response time.

If performance of the sensor has degraded beyond acceptable limits, it must be replaced.

CAP

RETAINER

MEMBRANE

O-RING

O-RING DIAPHRAGM

WASHER

DIAPHRAGMSCREW

BREATHERHOLE

CATHODE

HOLDER

CELL SEPARATOR(Accessory)

SENSOR MAINTENANCE


NOTES

7SERVICE


Most service and maintenance problems involve the sensor, Failures within the amplifierunit are less frequent. In system checkout the recommended procedure is first to isolate theamplifier from the sensor, then perform a few simple tests to determine if the amplifier isperforming satisfactorily. The sensor can be checked and then recharged, rejuvenated, orreplaced, as necessary.

Servicing this instrument requires access to shock hazard level voltages thatcan cause death or serious injury. Refer servicing to qualified service personnelonly.

Alarm contacts that are wired to a separate power source must be disconnectedbefore servicing.

Tampering or unauthorized substitution of components may adversely affectsafety of this product. Use only factory documented components for repair.

7.1. SYSTEM CHECKOUTThe most frequent fault is a progressive development of insensitivity of the sensor. Duringcalibration, the CAL control must be turned farther and farther clockwise to set the meter tothe desired calibration value. Finally, after several months of operation, rotating the CALcontrol to its clockwise limit fails to bring the meter to the desired calibration setting.

The cause of this characteristic change is the gradual exhaustion or occlusion of the sensor:accordingly, the sensor must be maintained as described in Section Six.

System problems can be isolated to the sensor or the amplifier by the following procedure:

1. Disconnect AC power from the instrument.

2. Set alarm switches S4 and S5 to OFF.



SERVICE


3. On TB1 and TB2, (Figure 2-2) make following connections:

a. Disconnect all leads of sensor cable.

b. Connect a 3K ohm resistor across the THERM 3K terminals and a 30K ohmresistor across the THERM 30K terminals. These resistors simulate theresistances of the thermistors at 25°C.

c. If the sensor is rechargeable, connect a 10K ohm resistor across terminalsmarked AN (for anode) and CATH (for cathode). If the sensor isnon-rechargeable, connect a 320K ohm resistor across these terminals. Thisresistor permits the polarizing voltage supply to provide a small current thatsimulates the sensor output signal.

4. Set RANGE switch to CAL.

5. Rotate CAL control throughout its range to verify that the outputs of the instrumentrespond from near zero to above fullscale.

If test yields correct results, amplifier is operational. The fault is in sensor or cable,Remove 3K ohm, 10K ohm, and 30K ohm resistors from TB1 and TB2, and proceed totests in Section 7.2 or 7.3.

If test does not yield correct results, proceed to tests in Section 7.3.

7.2 CHECKING SENSOR AND CABLEFor convenience, the sensor cable may be regarded as part of the sensor. Accordingly,electrical checks are made at the terminal ends of the cable, disconnected from the amplifierat TB1 and TB2. Verification of electrical integrity of the sensor is determined by making thefollowing checks with an ohmmeter:

1. Resistance between yellow and green leads should be 3K ohms ±1% at 25°C(approximately 10K ohms at 0°C, and 1.1K ohms at 50°C). Readings from yellow orgreen lead to any other lead of the sensor cable should indicate open circuit, or at least100 Meg ohms. Readings less than this indicate a shunt resistance path whichproduces an error in the measurement.

2. Resistance between blue and brown leads should be 30K ohms ±10% at 25°C(approximately 95K ohms at 0°C - and 11K ohms at 50°C). Readings from blue orbrown lead, to any other lead of the sensor cable, should indicate at least 100M ohms.Readings less than 100M ohm indicate a shunt resistance path which produces anerror in the measurement.

3. The black and white lead is connected to the grounding shield: readings from this leadto any other lead of the sensor cable should be at least 100M ohm.

4. If checks in Steps 1, 2 or 3 indicate trouble, or if other symptoms indicate the sensor tobe at fault, determine the probable cause by reference to the appropriate symptom(s) inTable 7-1 or 7-2. These tables, a compilation of the most common sensor problems,

SERVICE


should serve as a quick reference. Maintenance procedures specified in the tables aredescribed in Section 6.

FIGURE 7-1. EXPECTED DISPLAY READING VS. SUBSTITUTE RESISTANCE (MODEL7001D)

100 80 60 40 20 10 8 6 4 2 1 0.8 0.6

R1 Megohms

Note: Values shown are approximate for rechargeable sensor. For non-rechargeable sensor, multiply resistive values by 32 and perform simulated air calibration with 320K ohm resistor.

1

2

4

6

8

10

20

40

60

80

100

200

Exp

ecte

d D

ispla

y R

eadin

gP

art

s-P

er-

Thousa

nd-M

illio

n (

p109 )

Note:This chart is valid only after simulatedair calibration has been carried out.(See Text)

SERVICE


FIGURE 7-2. EXPECTED DISPLAY READING VS. SUBSTITUTE RESISTANCE (MODEL7002D)

1000 800 600 400 200 100 80 60 40 20 10 8 6 4

R1 Megohms

Note: Values shown are approximate for rechargeable sensor. For non-rechargeable sensor, multiply resistive values by 32 and perform simulated air calibration with 320K ohm resistor.

0.1

0.2

0.4

0.6

0.8

1

2

4

6

8

10

20E

xpec

ted D

ispla

y R

eadin

gP

art

s-P

er-

Thousa

nd-M

illio

n (

p106 )

Note:This chart is valid only after simulatedair calibration has been carried out.(See Text)

SERVICE


7.3 CHECKING NON-RECHARGEABLE SENSOR AND CABLETo check the cable, disconnect it from the monitor and the sensor. The resistance betweenany two leads should be at least 100 M ohm. A continuity check on any lead shouldproduce a reading of less than 15 ohms per thousand feet.

Refer to Table 7-2.

SYMPTOM PROBABLE CAUSE CORRECTIVE ACTIONa. Hole in membrane Replace membraneb. Gold cathode loose Replace sensor

1 . Abnormally high 02reading (inability tocalibrate) c. Open thermistor Replace sensor

a. High internal cell resistanceRejuvenate and rechargecell

b. Membrane too looseTighten cap or replacemembrane

c. Contaminated electrolyte1 Clean sensor and recharged. Shorted thermistor Replace sensor

2. Abnormally low 02readings (inability tocalibrate)

e. Membrane loose Replace membranea. Membrane loose Replace membraneb. Low electrolyte level Fill properly

3. Sensor noisy(motion-sensitive)

c, Cathode contaminated1 Rejuvenate and recharge4. Upscale reading withknown oxygen-free sample

a. Gold cathode loose Replace sensor

5. Slow response (sluggish) a. Contaminated electrolyte1 Rejuvenate and recharge

TABLE 7-1. RECHARGEABLE SENSOR PROBLEMS TROUBLESHOOTING GUIDE

SYMPTOM PROBABLE CAUSE CORRECTIVE ACTIONa. Hole in membrane Replace sensorb. Open thermistor Replace sensor

I . Abnormally high 02readings (inability to calibrate)

c. Cell contaminated Replace sensora. Thermistor shorted Replace sensor2. Abnormally low 02

readings (inability to calibrate) b. Dirty surface of membrane Clean front surfaceAdjust sensor ZEROcontrol

3. Upscale reading withknown oxygen-free samples(greater than 0-1% 02 orequivalent)

a. Sensor contaminatedCheck linearity withstandards

4. Slow response (sluggish) a. Sensor contaminated Replace sensor

TABLE 7-2. NON-RECHARGEABLE SENSOR PROBLEMS TROUBLESHOOTING GUIDE

1 So-called "contamination” may be the normal accumulation resulting from long-term operation, Indicative that the

standard cell rejuvenation procedure is now required.

SERVICE


7.4 CHECKING ELECTRONICSThe following procedure provides a more comprehensive test of amplifier electronics thanthat given in Section 7-1. Fixed resistors are substituted for the elements within the sensorand the response of the analyzer is observed by means of the front-panel display.

1. Perform Steps 1 through 5, Section 7.1, if not performed previously. Do not remove 3Kohm or 30K ohm resistors, and do not reconnect sensor cable.

2. Reconnect AC power to the monitor.

3. In Step 5 below, a simulated air calibration is carried out. Set the Range switch to CAL.

4. Adjust the CAL control fully clockwise. The display should indicate off-scale high.

5. Readjust the CAL control fully counterclockwise. The display should indicate nearzero.

6. Readjust the CAL control until the display is at 760 (disregard decimal point).Simulated air calibration is now complete. DO NOT readjust the CAL control during theremainder of this entire procedure.

7. The remainder of the procedure is carried out by connecting fixed resistors of differentvalues between the terminals of the terminal strip within the monitor which are labeledCATH and AN. These resistors simulate the output current of the sensor when it isexposed to various concentrations of dissolved oxygen. The resistors can beconveniently connected to the terminals by means of a pair of test leads.

8. Set RANGE switch to OP.

9. Figures 7-1 (Model 7001D) and 7-2 (Model 7002D) show expected display readingversus resistance of the resistor which is connected between the terminals labeledCATH and AN. Select resistors which will produce expected display readingsthroughout the range of the instrument. Connect the resistors one at a time, andobserve the display reading. Expected reading and observed reading should agreewithin the accuracy to which the values of resistance are known, plus 5%.

10. If these tests do not yield correct results, contact a factory authorized servicerepresentative.

8REPLACEMENT PARTS


The following parts are recommended for routine maintenance and troubleshooting. If thetroubleshooting procedures do not resolve the problem, contact Rosemount AnalyticalCustomer Service.

8.1 REPLACEMENT PARTS – MODELS 7001D AND 7002D

Tampering with or unauthorized substitution of components may adverselyaffect safety of the product. Use only factory documented components forrepair.

PART NUMBER DESCRIPTION858728 Arc Suppressor622605 Display Board – Model 7001D622610 Display Board – Model 7002D777156 Fuse 1/4A 120 VAC (pkg of 5)777360 Fuse 1/8A 240 VAC (pkg of 5)637358 Kit, Cell Separator (pkg of 10)624737 Kit, Header – Equilibrium Sensor621023 Kit, Isolated V/I Board622622 Kit, Mounting – Pipe652117 Kit, Mounting - Wall624735 Kit, Recharge – Equilibrium Sensor (10 recharges)191755 Kit, Recharge – Sensor (ten recharges)622537 Power Supply Board193661 Sensor Cable 20’193095 Sensor Cable 7’623373 Sensor, 45° Rechargeable – Polypropylene (Model 7002D)624750 Sensor, Equilibrium – Polypropylene (Model 7002D)623740 Sensor, Non-Rechargeable – Polypropylene (Model 7001D)623741 Sensor, Non-Rechargeable – Polypropylene (Model 7002D)623246 Sensor, Polypropylene – Rechargeable (Model 7001D)623245 Sensor, Polypropylene – Rechargeable (Model 7002D)190404 Sensor, Rechargeable – Ryton (Model 7002D)


REPLACEMENT PARTS


NOTES

015-748169-F


624737 HEADER KITModel 7002D Oxygen Monitor

Rosemount Analytical Inc.4125 East La Palma Avenue • Anaheim, California 92807-1802 • 714-986-7600 • FAX 714-577-8006

December 1997 • 015-748169-F • Printed in USA

THESE INSTRUCTIONS ARE NOT REQUIRED WHEN USED WITH THE MODEL1054 DISSOLVED OXYGEN ANALYZER

To convert a Model 7002D Oxygen Monitor which has been used with a rechargeableoxygen sensor so that it can be used with an Equilibrium oxygen sensor, it is necessaryto modify the display board of the instrument. This modification changes the gain of themonitor to match the output current available from the Equilibrium sensor. A header kit(P/N 624737) is provided for use in the modification.

7002D WITH EQUILIBRIUM SENSOR1. Remove the existing header in J4 on the display board. Mark and save for possible

future reconversion to use of a rechargeable sensor.

2. Refer to Figure 1. Install the 8 pin header from the kit (P/N 624737) into the J4position on the display board. Make sure that pin 1 on the header is installed in thepin 1 socket on the display board.

3. Install the 14 pin header from the kit into J2 on the display board. Make sure that pin1 on the header is installed in the pin 1 socket on the display board.

FIGURE 1. MODEL 7002D DISPLAY BOARD

J2 J4

015-748597-G


CONVERTING RECHARGEABLE SENSOR TO NON-RECHARGEABLE SENSOR

MODELS 7001D, 7002D AND 7003D OXYGEN MONITORS

Rosemount Analytical Inc.4125 East La Palma Avenue • Anaheim, California 92807-1802 • 714-986-7600 • FAX 714-577-8006

December 2000 • 015-748597-G • Printed in USA

To convert a Model 7001D, 7002D or 7003D Oxygen Monitor which has been used with arechargeable oxygen sensor so that it can be used with a non-rechargeable oxygen sensor, it isnecessary to modify the display board of the instrument. This modification changes the gain ofthe monitor to match the output current available from the non-rechargeable oxygen sensor. Aheader kit appropriate to each model is provided for use in the modification. To perform themodification to your instrument, select the appropriate instruction below.

7001D1. Remove the existing header in J3 on the display board. Mark it and save for possible

future re-conversion to use of a rechargeable sensor.

2. Install the 14 pin header from the kit (P/N 623731) into J2 on the display board. Referto Figure 1. Verify that pin 1 on the header is installed in the pin 1 socket on thedisplay board.

3. Install the 16 pin header from the kit into J3 on the display board. Verify that pin 1 onthe header is installed in the pin 1 socket on the display board.




Install the 16 pin header from the kit into J4 on the display board. Verify that pin 1 on theheader is installed in the pin 1 socket on the display board.

FIGURE 1. MODELS 7001D AND 7002D DISPLAY BOARD

J2

J3

J4

CONVERTING RECHARGEABLE SENSOR TO NON-RECHARGEABLE SENSOR

2 of 2 December 2000 Rosemount Analytical 748597-GModels 7001D, 7002D and 7003D Oxygen Monitors




FIGURE 2. MODEL 7003D DISPLAY BOARD

J5

rosemount analytical - emerson · 2.1 model 7001/7002 oxygen monitor.....9 2.1.1 facility...

Documents