Analyze • Detect • Measure • Control™

Orion 91-7991-80

Orion TriodeElectrode

INSTRUCTION MANUAL

ORP

™

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The specifications, descriptions, drawings, ordering information and part numbers within this document are subject to change without notice.

This publication supersedes all previous publications on this subject.

Table of Contents

General Information 1Introduction 1Required Equipment 2Required Solutions 2

Using the Electrode 3Setup 3Electrode Preparation 3

Filling Instructions 3Calibration Procedures 4

Manual ORP Calibration 4Relative mV Calibration 4

Automatic ORP Calibration 5ORP (EH) Autocalibration 5

Important Measurement Techniques 6Electrode Measurements 7

Direct Measurement 7Measuring Procedure 7Oxidation Reduction Titrations 10General Redox Titration Procedure 11Typical Redox Titration Methods 12

Electrode Maintenance 17Cleaning Procedures 17

Electrode Storage 19

Troubleshooting 21Checking Electrode Operation 21Assistance 22

Electrode Characteristics 23Reproducibility 23Temperature Effects 23

Warranty 25

Ordering Information 29

Specifications 30

General Information

Introduction

This manual contains instructions for the Orions 91-79 and 91-80ORP Triode™ Electrodes. Both Orions 91-79 and 91-80 consist of aplatinum redox sensor, a silver/silver chloride internal referencesystem and a built-in thermistor for Automatic TemperatureCompensation (ATC). Orion 91-80 is a refillable electrode, whichuses Orion 900011 or 900001 filling solution. Orion 91-79 is anon-refillable low maintenance gel-filled electrode.

Both orions have the capability to measure ORP and Temperaturesimultaneously without a separate reference electrode. Directmeasurements of redox potentials or potentiometric titrations canalso be performed with these ORP Triode electrodes. Orions 91-79and 91-80 are not designed for amperometric or constant currenttitrations, such as Karl Fischer analysis.

It is strongly recommended to use ORP standards, Cat. 967901 or967961, to ensure accurate measurements.

Figure 1

Orion 91-79 ORP Low Maintenance Triode,Orion 91-80 ORP Refillable Triode

1

Required Equipment

ORP Meter - ORP Triode™ electrodes are intended for use with thefollowing Orion meters:

• Orion 230Aplus Portable pH/mV/ORP/Temperature Meter

• Orion 250Aplus Advanced Portable pH/mV/ORP/Temperature Meter

Orion ORP Triode electrodes may also be used with Orion benchtopOrions 290A, 290Aplus, 410A, 410Aplus, 420A, 420Aplus, 520A,520Aplus, 525A, 525Aplus, 710A, 710Aplus, 920A, 920Aplus orprevious Orion meter orions with relative millivolt, and BNC electrodeinputs, and 8 pin DIN ATC inputs.

Required Solutions for Orion 91-80

NOTE: Orion 91-79 does not require any filling solution.

The electrode filling solutions below should be selected to bestmatch the ionic strength of the sample solution to minimize junction potentials:

• For dilute solutions with total ionic strength less than 0.2 M, useOrion 900001 filling solution that matches the potential of aconventional calomel electrode.

• For concentrated solutions with total ionic strength greater than0.2 M, use Orion 900011 filling solution, which is 4 M KClsaturated with Ag/AgCl.

2

Using the Electrode

Setup

To connect the electrode to the meter, insert the 8-pin DINconnector at the end of the cable to the ATC jack and the BNCconnector to the input jack of the meter.

Electrode Preparation

Filling Instructions for Orion 91-80

1. Remove electrode protective cap and keep the cap for storage.

2. Unplug the electrode fill hole cover on the electrode body.

3. Using the appropriate fill solution bottle, replace the flat cap onthe fill solution bottle with the flip-spout cap. Lift the spout tothe vertical position and insert into the fill hole.

4. Fill the electrode chamber up to a level just below the fill hole.

5. Shake down the electrode as you would with a thermometer toremove air bubbles.

IMPORTANT: Do not place the electrode fill hole cover backonto the electrode when making measurements!

3

Calibration Procedures

Manual ORP Calibration with Orions 230Aplus and 250Aplus

Relative mV Mode:

The function of the relative mV mode is to calculate the mV readingat a fixed user selected offset from absolute mV measured from theOrion ORP electrode Orions 91-79 or 91-80.

Relative mV Calibration Procedure:

1. Set the meter to the relative millivolt mode.See Meter Instruction Manual.

2. Place the ORP electrode in Orion ORP standard, Orion 967901 or 967961.

NOTE: If using Orion 91-80, make sure the proper fillingsolution is used and filling instructions are followed.

3. Calibrate the electrode by scrolling to the desired mV value of the ORP solution. (mV values for EH are on the bottle for Orion 967901 and see separate sheet for Orion 967961.) SeeMeter Instruction Manual for more detailed instructions.

4. Press YES key to accept value. Meter will automatically return toMEASURE mode and all relative millivolt measurements will bebased on the offset value.

NOTE: If error message displays on main field, press MODEkey to abort calibration. See Troubleshooting Section inMeter Instruction Manual.

4

Automatic ORP Calibration with Orions 230Aplusand 250Aplus

ORP (EH) Mode:

The function of the ORP mode is to calculate the equivalent mVreading which would be read by a Standard Hydrogen Electrode orNormal Hydrogen Electrode (NHE) using the measured input fromthe Orion ORP electrode Orion 91-79 or 91-80.

ORP (EH) Autocalibration Procedure:

1. Press MODE key to set the meter to the EH mode. (First timeuse of meter, dashes appear.)

2. Place the ORP electrode in Orion ORP standard, Orion 967901 or 967961.

NOTE: If using Orion 91-80, make sure the proper fillingsolution is used and filling instructions are followed.

3. Press the 2nd key and then Cal key. When meter is ready, the measured mV value which should be between the range of +160 mV and +280 mV is displayed and converted to the EH value.

NOTE: Error code “E-21” will be displayed if mV is notwithin this range. This error code is only a warningindicator. Press MODE key to switch out of the ORPautocalibration procedure to the mV mode. SeeTroubleshooting section.

4. Press YES key to accept the flashing EH value. Meter willautomatically switch back to the MEASURE mode.

5

Important Measurement Techniques

• Stir all standards and samples at a uniform rate during measurement.

• Magnetic stirrers may generate sufficient heat to change solution temperature. Place a piece of insulating material such as cork, cardboard or styrofoam between the stir plate andsample beaker.

• Always use fresh ORP standards for calibration.

• Always rinse electrode(s) with distilled water thoroughly between measurements. Gently shake electrode after rinsing to prevent solution carry-over, then blot dry with a lint-free tissue.

• Allow all standards and samples to come to room temperaturefor precise measurements.

• Make sure the electrode filling solution is appropriate for yoursample. See Electrode Preparation.

6

Electrode Measurements

Direct Measurement

Direct Redox Potential (ORP) measurements can be used to determine the oxidizing or reducing capability of a solution and arecommonly made in polluted streams, chlorinated waters, industrialwaste waters, and other water samples.

Measuring Procedure

1. After setting up the meter and calibrating the electrode, theelectrode is ready for measurements. When the meter switchesback to the MEASURE mode, place the electrode in the sample solution.

2. When the reading stabilizes, record the potential reading and the temperature.

NOTE: Refer to Table 1 or Table 2 for approximate absolutemillivolt readings compared against temperature when usingOrion ORP electrodes Orions 91-79 and 91-80 with Orion ORPsolution Orion 967901 or 967961. These values are forreference only. Actual readings may vary.

7

Table 1: Approximate Absolute Millivolt Values vs. Temperatureusing Orion ORP Solution with Orion 91-79 Electrode

Temp °C pH/ORP Gel

NOTE: Like all platinum redox electrodes, Orions 91-79 and91-80 may give unstable readings in solutions containingchromous, vanadous, titanous, and other ions that arestronger reducing agents than hydrogen or platinum.

8

0123456789

1011121314151617181920212223242526272829303132333435363738394041424344454647484950

222222222222223223223223223223223223224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224224

Table 2: Approximate Absolute Millivolt Values vs. Temperatureusing Orion ORP Solution with Orion 91-80 Electrode

Temp °C Orion 900011 Orion 900001Filling Solution Filling Solution

9

0123456789

1011121314151617181920212223242526272829303132333435363738394041424344454647484950

214214214215215215215215215215215215215215215215215215215215215215215215215215215215215215215215215214214214214214214214214214214213213213213213213213212

176176176176176176176176176175175175175175175175175174174174174174174173173173173173173172172172172172171171171171170170170170169169169169168168168168167

Oxidation Reduction Titrations

Oxidation-reduction, or redox titrations provide a simple, reliablemethod for determining many substances in solution. A redoxtitration consists of adding to an unknown sample of smallincrements of a titrant that converts the unknown to a differentoxidation state. After each addition of titrant, the platinum redoxelectrode develops a potential proportional to the logarithm of theratio of the activities of the two oxidation states. At the inflection,or end point, the titrant has completely oxidized or reduced theunknown, causing a sharp change in the logarithm of the ratio ofthe activities of the two oxidation states. A corresponding sharpchange in the potential is developed by the platinum electrode.Often several oxidizing or reducing species can be preciselydetermined in the same solution by a single titration with several inflection points.

Table 3 lists suitable titrants for different unknowns, the equationfor the titration reaction, interferences, and a reference whereinformation about preparing the sample and running the titrationcan be found. For similar information about unknowns not listed inthe table, consult the standard texts listed as references.

The following directions represent a general procedure forperforming a redox titration once the sample is prepared for measurement.

10

General Redox Manual Titration Procedure

1. Fill a 10 mL buret with a standard titrant solution whosenormality is 5 - 10 times that of the sample.

2. Connect electrode to the meter and turn the function switch tothe millivolt mode.

3. Pipet 50 mL sample into a 150 mL beaker. Stir with a magneticstirrer throughout the titration.

4. Add about 0.5 to 1 mL increments of titrant into the beaker,record the potential readings after each addition.

5. Near the end point, when large potential reading changes appear,decrease increments to 0.1 or to 0.2 mL. Continue the titration 3 to 4 mL past the end point.

6. Plot the electrode potential versus volume of added titrant on linear graph paper and draw a smooth curve through thepoints. The end point is the point of inflection (the point ofgreatest slope).

7. Calculate the normality of the sample, Nx, in equivalents per liter.

Nx = VtNt

Vx

where:

Nt = normality of titrant (Eq/1)

Vt = volume of titrant at end point (mL)

Vx = volume of sample (mL)

11

Table 3: Typical Redox Titration Methods

Unknown

antimony (Sb+3)

arsenic (As+3)

hydrogen peroxide (H2O2)

hypochlorite ion (CLO-) or chlorine (CL2)

iodine (I2)

iodine (I2)

iron (as Fe+2, Fe+3 or in steel)

iron (as Fe+2, Fe+3 or in steel)

manganese (as permanganate MnO4-)

manganese (as Mn+2)

stannous tin (Sn+2)

sulfur with dioxide (as sulfur SO2)

thallium (Ti+)

thiosulfate ion with (S2O3=)

uranium (as uranyl ion UO+2)

Zinc (Zn+2)

12

13

Interferences

As; Fe; SO2; V; organic substances and others interfere

other reducing agents

preservatives present in commercial H2O2 may interfere

Br2 and other oxidizing agents interfere by liberating I2

other reducing agents

direct sunlight, high acidity, copper salts and other catalysts promote air oxidation and cause false high results.

high levels of organic acids, such as acetic, oxalic, tartaric, and alcohols; F- if present in more than trace amounts; C1-, PO4

-3 (remove by adding acid)

other reducing agents

other oxidizing agents

other reducing agents

other reducing agents

S= and SO2= , remove by shaking with dioxide CdCO3, and filtering

other reducing agents

S= and SO3= , remove by shaking with CdCO3,

and filtering

other reducing agents

other reducing agents

References:

1. Furman (ed.), Scott’s Standard Methods of Chemical Analysis, 5th Ed., Van Nostrand, Princeton, N.J. 1938.

2. Hillebrand, Lundell, Bright, and Hoffman, Applied Inorganic Analysis, 2nd Ed., Wiley, New York, 1953.

3. Kolthoff and Sandell, Testbook of Quantitative Inorganic Analysis, 3rd. Ed., MacMillan, New York, 1952.

4. Oesper, Newer Methods of Volumetric Chemical Analysis, Van Nostrand, Princeton, N.J., 1938.

5. Treadwell and Hall, “Analytical Chemistry,” vol. 2, Quantitative Analysis, 8th Ed., Wiley, New York, 1935.

14

Suitable Titrants

potassium permanganate (KMnO4)

sodium bromate (NaBrO3)

potassium permanganate (KMnO4)

sodium iodide (NaI)

sodium iodate ( NaIO3 )

sodium thiosulfate (Na2S2O3)

ceric sulfate [Ce(SO4)2] (not recommended for samples containing Cl-)

potassium dichromate (K2Cr3O7), recommended for samples containing Cl-

ferrous sulfate (FeSO4)

potassium permanganate (KMnO4)

ceric sulfate [Ce(SO4)2]

iodine (I2)

sodium bromate (NaBrO3)

Iodine (I2)

potassium dichromate (K2 Cr2O7)

sodium iodate (NaIO3)

15

Titration Reaction Ref.

5Sb+3 + 2MnO4- + 16H+ � 2

5Sb+3 + 2Mn+2 + 8H2O

BrO3- + 3As+3 + 6H+ � 3

Br- + 3As+5 + 3H2O

5H2O2 + 2MnO4- + 6H+ � 5

5O2 + 2Mn+2 + 8H2O

in acid solution: Cl2 +2I- � 1I2 + 2Cl-, In basic solution:2ClO- + 2I- � I2 + 2Cl- + 2OH-

2I2 + IO3- + 5HCN + H+ � 4

5ICN+ 3H2O

I2 + 2S2O3= � 2I-+ S4O6

-2 3

Fe+2 + Ce+4 � 2Ce+3 + Fe+3

Cr2O7-2 + 6Fe+2 + 14H+ � 3

2Cr+3 + 6Fe+3 + 7H2O

MnO4- + 5 Fe+2 + 8H+ � 2

Mn+2 + 5Fe+3 + 4H2O

3Mn+2 + 2MnO4- + 7H2O � 1

5MnO3 + H2O + 4H+

Sn+2 + 2Ce+4 � Sn+4 4+ 2Ce+3

SO2 + I2 + 2H2O� 1SO4

-2 + 2I- + 4H+

BrO3- + 3Ti+ 6H+ � 3

Br- + 3Ti+3 3H2O

I2 + 2S2O3-2 � 2I- 3

+ S4O6

3UO+2 + Cr2O7-2 + 8H+� 3

3UO2+2 + 2Cr+3 + 4H2O

ZnHg(SCN)4 + 6IO3- + 2

6Cl- + 8H+ � Zn+2 + Hg+2

+ 6ICl + 4HCN + 4SO4-2

16

Electrode Maintenance

Orion 91-79

This low-maintenance ORP Triode™ electrode can be rinsed off withdistilled water from any salt build-up.

Orion 91- 80

This refillable ORP Triode electrode should be routinely cleaned. To remove precipitate from outside wall or on electrode tip, rinsewith distilled water. Make sure that the filling solution does notcrystallize or dry out. If crystallized, run the electrode underdistilled water or wipe the vent hole area with a damp tissue and then fill with filling solution. Always keep the electrode fill holeplug on to prevent salt build up while storing for a short period oftime up to one day. Fill hole must be open during measurements.

Cleaning Procedures

Orion 91-79 and Orion 91-80

To remove precipitate or salts that form on the exterior of theelectrode, rinse with distilled water.

Orion 91-80

To remove salt deposits formed inside the electrode, follow theprocedure below:

1. Fill a wash bottle to half with distilled water.

2. Invert electrode so that sensor points up.

3. Insert nozzle of wash bottle into electrode filling hole andsqueeze bottle.

4. Fill chamber with distilled water.

5. Take a 1 mL plastic disposable pipet and remove the liquid fromthe inverted electrode.

6. Repeat steps 2 to 4 until precipitate and deposits are removed.

7. Rinse with fresh filling solution. Remove filling solution with pipet.

8. Fill with fresh filling solution.

17

18

Electrode Storage

Short-term Storage (up to one day):

• Electrodes may be kept in distilled water or air.

Long-term Storage (more than 24 hours):

• Store electrodes dry. For Orion 91-79, rinse electrode, dry withlint-free tissues or air dry, and replace with electrode protectivecap. For Orion 91-80, remove salt crystals on the outside of theelectrode by rinsing with distilled water, drain filling solutionfrom chamber, flush out with distilled water and store dry. See Cleaning Procedures. Replace electrode protective caps toprevent sensor damage.

19

20

Troubleshooting

Checking Electrode Operation

Checking the electrode is necessary only when there is evidence of malfunction that cannot be traced to other causes.Solution temperature must be at 25±1 °C. For Orion 91-80, fill theelectrode with Orion 900011 filling solution prior to checkingprocedure.

Using Orion ORP Standard, Orion 967901 or 967961

1. Place electrode in the ORP solution and wait until the reading stabilizes.

2. The potential reading should be about 220 ±60 mV. If mV is out of range, see Troubleshooting section.

Alternative Method to Test Electrode

1. Prepare solution A (0.1 M potassium ferrocyanide and 0.05 M potassium ferricyanide): weigh out 4.22 g reagent-gradeK4Fe(CN)6 • 3H2O) and 1.65 g reagent-grade K3Fe(CN)6. Place in a 100 mL volumetric flask. Add about 50 mL distilledwater and swirl to dissolve solids. Dilute to volume with distilled water.

2. Prepare solution B (0.01 M potassium ferrocyanide, 0.05 M potassium ferricyanide, and 0.36 M potassium fluoride): weigh out 0.42 g reagent-grade K4Fe(CN)6 • 3H2O), 1.65 g reagent-grade K3Fe(CN)6 and 3.39 g reagent-grade KF • 2H2O. Place in a 100 mL volumetric flask. Add 50 mLdistilled water, and swirl to dissolve solids. Dilute to volumewith distilled water.

3. Transfer solution A to a 150 mL beaker. Place electrode in thesolution and wait until the reading stabilizes. The potentialshould be about 234 mV.

4. Rinse electrode and repeat the measurement with solution B.The potential should be about 66 mV greater in solution B thanin solution A.

21

Assistance

After troubleshooting all components of your measurement system,contact The Technical EdgeSM for Orion products. Within the UnitedStates call 1.800.225.1480, outside the United States call978.232.6000 or fax 978.232.6031. In Europe, the Middle East andAfrica, contact your local authorized dealer. For the most currentcontact information, visit www.thermo.com.

22

Electrode Characteristics

Reproducibility

Reproducibility is limited by factors such as temperaturefluctuations, drift, and noise. Within the electrode operating range,reproducibility is independent of concentration. With calibrationevery hour, direct electrode measurements reproducible to ±2% can be obtained.

Temperature Effects

Since electrode potentials are affected by changes in temperature,samples and standard solutions should be ±1 °C (±2 °F) of eachother. If temperature changes occur, meter and electrodes shouldbe recalibrated.

Table 4: Provides the ORP EH (mV) value at correspondingtemperature compared with the calculated mV using the following equation:

VR = V2 + dV

where:

V2 = Measured input in mV from electrode during calibration

dV = Calculated mV offset from calibration

VR = Displayed value in relative mV mode

23

Table 4: mV values for Normal Hydrogen Electrode (NHE) and calculated values from the calibration equation using any OrionORP electrode with Orion ORP solution Orion 967901 or 967961 and Orion 230A or 250A.

Deg. °C NHE Value Cal. Value

24

0.01.02.03.04.05.06.07.08.09.0

10.011.012.013.014.015.016.017.018.019.020.021.022.023.024.025.026.027.028.029.030.031.032.033.034.035.0

437.8437.2436.6435.9435.3434.6433.9433.3432.6431.9431.2430.5429.7429.0428.3427.5426.8426.0425.2424.4423.6422.8422.0421.2420.4419.5418.7417.8416.9416.1415.2414.3413.4412.5411.5410.6

437.8154437.1927436.5608435.9199435.2699434.6108433.9426433.2654432.579431.8836431.179430.4654429.7427429.0109428.27427.52426.761425.9928425.2155424.4292423.6338422.8293422.0157421.193420.3612419.5204418.6704417.8114416.9432416.066415.1797414.2843413.3798412.4663411.5436410.6118

25

WARRANTY

For the most current warranty information, visit www.thermo.com.

The Thermo Electron Corporation, Orion products warranty coversfailures due to manufacturer’s workmanship or material defects fromthe date of purchase by the user. User should return the warranty cardand retain proof of purchase. Warranty is void if product has beenabused, misused, or repairs attempted by unauthorized persons.

Warranties herein are for product sold/installed by Thermo or itsauthorized dealers.

Any product sold by a U.S. or Canadian distributor must be returnedto Thermo for any warranty work. Please contact our Technical Servicedepartment for further information. A Return Authorization Numbermust be obtained from The Technical EDGESM for Orion Productsbefore returning any product for in-warranty repair or replacement.

In the event of failure within the warranty period, Thermo will at thecompany’s option, repair or replace product not conforming to thiswarranty. There may be additional charges, including freight, forwarranty service performed in some countries. For service, callThermo or its authorized dealer outside the United States and Canada.Thermo reserves the right to ask for proof of purchase, such as theoriginal invoice or packing slip.

Field Service is available on Orion BOD AutoEZ™, EZ Flash® GCAccessory and TEA Analyzer®. Contact our Field Service departmentfor details on quotations, service and other field service-relatedactivities.

The following products are warranted to be free from defects inmaterial and workmanship in the period listed below from the date ofpurchase from the user or from the date of shipment from Thermo,whichever is earlier, provided use is in accordance with the operatinglimitations and maintenance procedures in the instruction manual andwhen not having been subjected to accident, alteration, misuse, abuseor breakage of electrodes:

Thirty-six months from date of purchase by the user (or forty-twomonths from date of shipment from Thermo)

26

• Waterproof Meters (Orion 630, 635, 830A, 835A, 260A, 261S,265A, 266S, 130A, 131S, 135A and 136S), Conductivity Meters(Orion 105Aplus, 115Aplus, 125Aplus, 145Aplus, 150Aplus and162A), PerpHect® pH/ISE Meters (Orion 310, 320, 330, 350, 370)pH/ISE Meters (Orion 210Aplus, 230Aplus, 250Aplus, 290Aplus,410Aplus, 420Aplus, 520Aplus, 525Aplus, 710Aplus, 720Aplusand 920Aplus), pHuture MMS™ Meters (Orion 535A and 555A),pH/Conductivity Meter (Orion 550A), Dissolved Oxygen Meters(Orion 805Aplus, 810Aplus, 850Aplus and 862A).

Twenty-four months from date of purchase by the user (or thirty-sixmonths from date of shipment from Thermo)

• Orion ROSS Ultra® Electrodes, Orion AQUAfast® IV Colorimeters,Orion AQUAfast® IV Turbidimeter, Orion 925 Flash Titrator™,Series 100 DuraProbe™ Conductivity Cells and Series 800Dissolved Oxygen Probes.

Twelve months from date of purchase by the user (or eighteenmonths from date of shipment from Thermo)

• Laboratory pH Meters, (Orion 301, 611 and 940), SensorLink®,pHuture™ pH Meters (Orion 610 and 620), Sage® Pumps, Cahn®

Balances, 930 Ionalyzer®, 950 ROSS™ FAST QC™ Titrator, 960Titrator PLUS®, Karl Fischer Titrators, Autosamplers, LiquidHandling Devices, Liquid Handling Automation Workstations(Orion AS2000, AS2500 and AS4000), Pumps (Orion SP201,SP201-HR, SP201-S, Peristaltic and Rinse), pHuture® ConversionBox, Wine Master®, 607 Switchbox, rf link™, AQUAfast® IIColorimeters, Vacuum Degasser and Flowmeter.

• Orion EZ Flash® GC Accessory, Orion TEA Analyzer® 610 and 510excluding consumable items carry twelve months warranty only.

• Orion Ion Selective Electrodes, ionplus® Electrodes, ROSS™

Electrodes, Sure-Flow® Electrodes, PerpHecT® Electrodes,AquaPro Professional Electrodes, No Cal™ pH electrodes,Standard Line pH Electrodes, Tris pH Electrodes, KNIpHE®

electrode, ORP Triode™ (Orion 9180BN), pHuture™ pH Probes(Orion 616500) and pHuture MMS™ Quatrode™ and Triode™

(Orion 616600 and 617900), Orion 97-08 DO Probe, Series 100Conventional Conductivity Cells, temperature probes andcompensators (except those products noted).

• Orion 93 and 97 ionplus Series sensing modules are warranted togive six months of operation if placed in service before the dateindicated on the package, except 93-07 and 97-07 Nitrate

27

modules are warranted to give ninety days of operation if placedin service before the date indicated on the package.

Six months from date of purchase by the user (or twelve monthsfrom date of shipment from Thermo)

• Orion Flash Titration™ Probe (Orion 092518), pHuture™ Electrode(Orion 615700), pHuture MMS™ Pentrode™ (Orion 617500),Quatrode™ (Orion 617800) and Triode™ (Orion 615800), LowMaintenance Triode™ (Orion 9107BN), ORP Low MaintenanceTriode™ (Orion 9179BN), and PerpHecT® Low MaintenanceTriode™ (Orion 9207BN), Waterproof Triode™ (Orion 9107WP,9107WL, 9109WL and 9109WP), QuiKcheK® Meters and MicroElectrodes.

Three months from date of purchase by the user (or six monthsfrom date of shipment from Thermo)

• Economy Line Electrodes, Orion 91-05, 91-06, 91-15, 91-16, 91-25, 91-26, 91-35, 91-36, 92-06. Warranty also includes failurefor any reason (excluding breakage), except abuse, provided theelectrode is not used in solutions containing silver, sulfide,perchlorate, or hydrofluoric acid; or in solutions more than one(1) Molar in strong acid or base at temperatures above 50 °C.

“Out-of-Box” Warranty - Should any of the following products failto work when first used, contact Thermo immediately forreplacement.

• Orion Solutions, Standards, Reagents, Cables, Ferrules, Tubing,Line adapters, Printers, Software, Cases, Stands, ProbeMembranes, AQUAfast® Test Strips, EZ Flash® columns, LiquidHandling Probes, Adapter Plates and Racks and generalaccessories.

For products in the catalog not listed in this warranty statement,please visit our website at: www.thermo.com.

THE WARRANTIES DESCRIBED ABOVE ARE EXCLUSIVE AND INLIEU OF ALL OTHER WARRANTIES WHETHER STATUTORY,EXPRESS OR IMPLIED INCLUDING, BUT NOT LIMITED TO, ANYIMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR APARTICULAR PURPOSE AND ALL WARRANTIES ARISING FROM THECOURSE OF DEALING OR USAGE OF TRADE. THE BUYER’S SOLEAND EXCLUSIVE REMEDY IS FOR REPAIR OR REPLACEMENT OFTHE NON-CONFORMING PRODUCT OR PART THEREOF, OR REFUNDOF THE PURCHASE PRICE, BUT IN NO EVENT SHALL THERMO (ITSCONTRACTORS AND SUPPLIERS OF ANY TIER) BE LIABLE TO THE

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BUYER OR ANY PERSON FOR ANY SPECIAL, INDIRECT,INCIDENTAL, OR CONSEQUENTIAL DAMAGES WHETHER THECLAIMS ARE BASED IN CONTRACT, IN TORT (INCLUDINGNEGLIGENCE), OR OTHERWISE WITH RESPECT TO OR ARISING OUTOF THE PRODUCT FURNISHED HEREUNDER.

REPRESENTATION AND WARRANTIES MADE BY ANY PERSON,INCLUDING ITS AUTHORIZED DEALERS, REPRESENTATIVES ANDEMPLOYEES OF THERMO WHICH ALTER OR ARE IN ADDITION TOTHE TERMS OF THIS WARRANTY SHALL NOT BE BINDING UPONTHERMO UNLESS IN WRITING AND SIGNED BY ONE OF ITSOFFICERS.

Ordering Information

Orion No. Description

900011 Electrode Fill Solution 5 x 60 mL

900001 Internal Fill Solution 5 x 60 mL

9179BN Gel-filled ORP Triode™ Electrode

9180BN Refillable ORP Triode Electrode

976901 ORP Standard, 475 mL bottle

976961 ORP Standard, 60 mL bottle

0230A2 Orion 230Aplus Portable Meter only

0250A2 Orion 250Aplus Portable Meter only

0290A2 Orion 290Aplus Portable Meter only

090043 Swing Arm Electrode Holder and Stand

090070 A-Series Electrode Holder and Stand

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Specifications

Orion 91-79 Orion 91-80

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Orion No.

Construction

length

body diameter

cable length

temperaturerange

connectors

filling solution

9179BN

gel-filled epoxy-body

120 mm

12 mm

1 m

0 - 80 °C

8-pin DIN and BNC

Not Required

9180BN

refillable epoxy-body

120 mm

12 mm

1 m

0 - 80 °C

8-pin DIN and BNC

Orion No. 900011 -suitable for use insamples having atotal ionic strengthgreater than 0.2 M

Orion No. 900001 -suitable for use insamples having atotal ionic strengthless then 0.2 M

specifications subject to change without notice