barton 753a gauge pressure transmitter user manual

BARTON® MODEL 753AGAGE PRESSURE TRANSMITTER

User ManualPart No. 9A-10840, Rev. 02

March 2020

ContentsSafety ............................................................................................................ 2

Section 1—Introduction ................................................................................. 3General ......................................................................................................... 3Product Description....................................................................................... 3

Gage Pressure Transducer ...................................................................... 3Electronic Transmitter................................................................................ 3Power Supply ............................................................................................ 4

Zero and Span Control.................................................................................. 4Zero Control .............................................................................................. 4Span Control ............................................................................................. 4

Specifications ............................................................................................... 5Section 2—Theory of Operation .................................................................... 7

Basic Components ........................................................................................ 7Gage Pressure Transducer ....................................................................... 7Electronic Transmitter................................................................................ 7

Basic Operation ............................................................................................ 7Surge Voltage Protection Circuit .............................................................. 8Reverse Polarity Protection ....................................................................... 8Regulator ................................................................................................... 8Strain Gage Bridge Network ..................................................................... 8Signal Amplifier.......................................................................................... 9Current Amplifier........................................................................................ 9

Temperature Compensation.......................................................................... 9Section 3—Installation, Startup, and Shutdown ........................................ 10

Overview ..................................................................................................... 10Unpacking/Inspection.................................................................................. 10Initial Calibration Check .............................................................................. 10Mounting ..................................................................................................... 10

Wall or Rack Mounting ............................................................................ 10Piping Guidelines .........................................................................................11Electrical Connections ................................................................................11

Loop Resistance Calculations ................................................................. 13Maximum Loop Resistance ..................................................................... 14

2

SafetyBefore installing this product, become familiar with the installation instruc-tions presented in Section 3 and all safety notes throughout.

! WARNING:Thissymbolidentifiesinformationaboutpracticesorcircum-stances that can lead to personal injury or death, property damage, oreconomic loss.

CAUTION: Indicates actions or procedures which if not performed correctly may lead to personal injury or incorrect function of the instrument or connected equipment.

IMPORTANT: Indicates actions or procedures which may affect instrument operation or may lead to an instrument response that is not planned.

EMI/RFI Shielding.........................................................................................14Startup Procedure.........................................................................................14Shutdown Procedure....................................................................................15

Section 4—Calibration and Maintenance.....................................................16General Field and Periodic Maintenance......................................................16

Electronic Transmitter................................................................................16Calibration.....................................................................................................16Test Equipment.............................................................................................16

Electrical Connections for Calibration.......................................................17Calibration Checkpoints............................................................................18Calibration Procedure................................................................................18

Troubleshooting............................................................................................20Section 5-Assembly Drawing and Parts List...............................................21Section 6-Dimensional Drawings..................................................................23Appendix A.....................................................................................................25

Safety Precautions........................................................................................25Flow Application........................................................................................25

Typical Piping/Startup Example....................................................................25Gas Flow...................................................................................................25

Product Warranty............................................................................................26Product Brand.................................................................................................26

3

Model 753A Gage Pressure Transmitter Section 1

Section 1—Introduction

GeneralThe Model 753A Gage Pressure Transmitter provides a 4-20 mA or 10-50 mA proportional-to-gage-pressure signal for transmission to remote receiving, control, or readout devices. Sources of gage pressure include liquid and gas flow through orifice plates, nozzles or venturis; static line pressures, etc.

Product DescriptionThe Model 753A utilizes a gage pressure transducer functioning in combina-tion with an electronic circuit. The 4-20 mA or 10-50 mA output is compati-ble with a wide range of electronic receiving, control, and readout equipment. The instrument utilizes surface mount electronic components, electronic circuits and a molecular-bonded strain gage sensing cantilever beam, actuated directly by a Bourdon tube pressure sensing element. In many applications, the electrical connections are contained within a junction box, as shown in Figure 3.1, page 12. However, the junction box is optional.

Gage Pressure Transducer

The mechanical actuating device for the Model 753A transmitter is a C-type Bourdon tube pressure sensing element enclosed in a pressure housing.

Figure 1.1—Gage pressure transducer assembly

Electronic Transmitter

The electronic transmitter supplies a 4-20 mA or 10-50 mA direct current output signal that is proportional to the gage pressure sensed by the Bourdon tube. The output signal is transmitted over two wires to remote receiving devices.

4

Section 1 Model 753A Gage Pressure Transmitter

Power Supply

A regulated direct current (DC) power supply is required to operate the trans-mitting loop. The voltage required will depend on the total loop resistance (load resistor, cable wiring, and any other resistance in the loop) as shown in Figure 3.3, page 13. Table 3.1, page 13 shows the resistances in ohms per 1000 feet of wiring for the various cable wire sizes. Once the total loop resistance has been determined, the power supply voltage can be calculated as follows:• For 4-20 mA output: VDC = 12 VDC + 2 VDC per 100-ohms load• For 10-50 mA output: VDC = 12 VDC + 5 VDC per 100-ohms loadExercise care when calculating the power supply voltage. A power supply specified at 50 VDC ±1 volt must be considered a 49 VDC source to insure the minimum required voltage at the transmitter. Use the actual value when available. Otherwise, use the "worst case" value.

Power supply wiring connections are shown in Figures 3.1 and 3.2, page 12.

Zero and Span ControlThe transmitter has two 10-turn potentiometers—one for zero adjustments, the other for span control. With these two controls, measurement can be made between any two points within the rated transmitter span. However, to ensure a high level of accuracy, combined zero and span adjustments should never exceed ±5% of the factory calibration.

IMPORTANT: Combined zero and/or span field adjustments exceeding ±5% of the fac-tory calibration can alter transmitter performance in direct proportion to the changes to the factory calibration. For example, if combined adjust-ments to zero and span change the factory calibration by a factor of 2, transmitter performance may be decreased by a factor of 2.

Zero Control

During calibration, the zero control is used to adjust the instrument’s output signal to 4 mA or 10 mA at the minimum pressure setting of the instrument.

Span Control

When a transmitter leaves the factory, it has a fixed range of 0-200 psig, 0-2500 psig, etc. Typically the output from the transmitter varies from 4-20mA or 10-50 mA. This output is linear with the measured variable, as shownin Figure 1.2, page 5.

5


During calibration, the span control is used to adjust the instrument’s output to 20 mA or 50 mA output signal at the maximum pressure setting of the instrument.

10

50

OR

ELE

CT

RO

NIC

SIG

NA

L m

A

4

20

20 40 60 80 100% OF FULL SCALE DP RANGE

Figure 1.2—Output calibrated to upper limit of DP range

Specifications

Input Range .................................... 0-108 psig to 0-4620 psig (Consult factory for other ranges)

Output ............................................. 4-20 mA or 10-50 mA, direct or reverse acting Reference Accuracy* ...................... ±0.5% of factory-calibrated span, including effects of

non-linearity, hysteresis, and repeatability(±0.25% accuracy optional)

Zero/Span Adjustments .................. Combined zero/span field adjustments are limited to ±5% of factory-calibrated span. See Zero Suppres-sion and Custom Span for additional options.

Zero Suppression ........................... Available as an option. 0% to 50% suppression of factory-calibrated span

Custom Span .................................. Available as an option. 20% to 100% of factory-calibrated span

Sensitivity* ...................................... ±0.01% of factory-calibrated spanPower Requirements (see Figure 3.3, page 13) 4-20 mA ....................................... 12 VDC plus 2 VDC per 100-ohms load (to 70 VDC

maximum) 10-50 mA ..................................... 12 VDC plus 5 VDC per 100-ohms load (to 70 VDC

maximum)Load Range (includes line and receiver; see Figure 3.3, page 13) 4-20 mA ....................................... 50 ohms per volt above 12 VDC (to 2900 ohms

maximum) 10-50 mA ..................................... 20 ohms per volt above 12 VDC (to 1160 ohms

maximum) Load Effect*

4-20 mA ....................................... ±0.025% of factory-calibrated span per 100-ohms change

10-50 mA ..................................... ±0.05% of factory-calibrated span per 100-ohmschange

6


Power Supply Effect*4-20 mA ....................................... ±0.025% of factory-calibrated span per 1 Volt

change10-50 mA ..................................... ±0.05% of factory-calibrated span per 1 Volt change

Noise* ............................................. 0.2% (peak-to-peak) maximum of factory-calibrated span

Thermal Effect*(combined effect on zero and span)........................................ ±1.0% of factory-calibrated span per 100ºF change

within the operating temperature range selectedOperating Temperature ................... 40ºF to 135ºF (standard), -15ºF to +135ºF (optional)Overpressure limit .......................... 1.5 × factory calibrated range without damage to unitProcess Connections...................... 1/4" NPT (female)Weight ............................................ 8 lbElectrical Interface .......................... 1/2 inch conduit connections to internal screw termi-

nals (external junction box optional)

*Note: Turndown has a directly proportional effect on the indicated specifications. Zeroor span field adjustments beyond ±5% may affect indicated performance. Calibration isby the end-point method with zero and full scale outputs held to ±0.5% of true calibratedvalues.

IMPORTANT: The Model 753A transmitter has no integral electronic interference sup-pression features. If an instrument is to be installed in an area containing EMI/RFI sources and this interference cannot be tolerated, take precau-tions to protect the transmitter signal. See also EMI/RFI Shielding, page 14. An optional EMI/RFI filter system is available upon request.

7


Section 2—Theory of Operation

Basic Components

Gage Pressure Transducer

The gage pressure sensing element is a C-type Bourdon tube. The C-type Bourdon tube is an arc-shaped metal tube, elliptical in cross-section and open at one end. The open end is attached to the pressure source. The closed end is free to move. When pressure is applied to the inside of the tube through the open end, the tube loses its circular shape and the sensing element is actuated.

The gage pressure transducer range is determined by the force required to move the C-type Bourdon tube bellows through its normal range of travel. To provide for various ranges, tubes are designed with different wall thicknesses and degrees of tube cross-section distortion.

Strain Gage Assembly. The strain gage assembly consists of a strain gage beam and a glass-to-metal seal feed-through assembly. Strain gages are bonded to opposite sides of the strain gage beam. The end of the strain gage beam is connected to the gage pressure sensing element. Any movement of the sensor causes a corresponding linear movement of the strain gage beam which acts upon the strain gages. Any action of the strain gages is monitored by the electronic transmitter circuit.


The 753A transmitter senses the pressure applied at the input of the gage pres-sure assembly and the electronic circuit converts to a 4-20 mA or 10-50 mA output signal. The pressure causes the closed end of the C-type Bourdon tube to move and the movement is mechanically transmitted to the strain gages by the strain gage beam. Motion of the end of the strain gage beam applies ten-sion to one gage and compression on the other. The gage in tension increases in resistance, while the one under compression decreases in resistance. The two gages are connected to form two active arms of a bridge circuit.

Basic OperationThe electronic transmitter is basically a loop current regulating device, where loop current is controlled by an input of mechanical force or motion. The block diagram (Figure 2.1, page 8) shows the relationships of the various stages and the main flow of the electrical currents. As shown, the transmitter, power supply, and load (line plus receiving device) are connected in series.

The current from the power supply enters the transmitter, passes through the reverse polarity protecting diode, then divides into two separate paths. The

8


main current flows through the current amplifier stage and returns to the loop. The remainder of the current passes through the electronic regulator where it divides into two paths, through the bridge circuit and the voltage amplifier. The current is then returned to the loop. The total loop current flows through the load and back to the power supply.

Surge Voltage Protection Circuit

Two gas discharge tubes and a Zener diode are placed in the input circuit to prevent transient voltages from entering the transmitter circuit.

Reverse Polarity Protection

Reverse input polarity protection is provided by the forward-conducting diode. In the event the polarity of the input is reversed, the diode blocks the input and prevents the reversed input power from damaging the electronic circuit components. The diode can accommodate a maximum of 80 Volts without damage.

Regulator

This stage of the circuit regulates that portion of the loop current which is not calibrated at the current amplifier stage, and provides stabilized voltage for bridge excitation and power for the signal amplifier.

Figure 2.1—Operational block diagram

Strain Gage Bridge Network

The strain gage bridge network consists of two silicone piezo-resistive strain sensors, the zero adjusting potentiometer, bridge completion resistors, and the temperature compensation components.

9


Signal Amplifier

The signal amplifier is an integrated circuit operational amplifier which pro-vides amplification of the strain gage bridge network output voltage.

Current Amplifier

The current amplifier circuit converts the signal amplifier output voltage to current. The amount of current is precisely regulated with the feedback net-work to make it proportional to the bridge output.

Temperature CompensationThe Model 753A transmitter is temperature-compensated at the factory. Only those repairs described in Section 4 of this manual may be performed in the field without voiding the certified performance.

10


Section 3—Installation, Startup, and Shutdown

OverviewThis section describes the steps required to install the instrument so that it will perform to its original factory calibration condition. Installation tasks include• initial calibration check• mounting the transmitter• installing piping• installing field wiring

Unpacking/InspectionThe instrument should be inspected at the time of unpacking to detect any damage that may have occurred during shipment.

IMPORTANT: The unit was checked for accuracy at the factory. Do not change any of the settings during examination or accuracy will be affected.

If the transmitter is Class II cleaned, it is shipped in a polyethylene bag to protect the instrument from contamination. Remove this bag only in a clean area.

Initial Calibration CheckThe Model 753A transmitter is factory-calibrated. However, to ensure that the calibration is intact following shipping, a calibration check is recommended prior to operating the instrument. See Calibration, page 16, for step-by-step instructions. Record the "as found" values and recalibrate, if necessary.

MountingMount the transmitter so that the transmitter cover is facing the operator and the controls are on the right side. Use mounting structures that are designed to minimize vibration and prevent resonance. Support connected process tubing and conduit using the same mounting as the instrument base to minimize rela-tive motion of the instrument and connections.

Wall or Rack Mounting1. Locate and drill four bracket mounting holes in the mounting surface.2. Attach the instrument to the wall using 5/16" (8 mm) bolts, Grade 5 or

better, and torque to 10-20 ft-lb.

11


Piping GuidelinesObserve the following practices when piping for flow and liquid level ap-plications.1. Install the transmitter as near the primary metering device as possible,

and choose a piping diameter accordingly. For distances up to 50 feet,use 1/4-inch pipe or tubing. For runs of 50 to 100 feet, use 1/2-inch pipeor tubing.

IMPORTANT: Distances greater than 100 feet should be used only if an air purge or blow-back system is installed.

2. Slope all piping at least one inch per linear foot to avoid liquid or gasentrapment in the lines or the instrument.• Slope all piping downward from the transmitter when used in gas

applications to prevent liquid entrapment.• Slope all piping upward from the transmitter when used in liquid ap-

plications to prevent liquid entrapment.3. If the process temperature exceeds 135ºF, provide a minimum of 2 feet

of uninsulated piping between the transmitter and the primary meteringdevice for each 100 degrees in excess of +135ºF.

4. Install a suitable pulsation dampening device upstream of the transmitter.Where severe pulsation is present, the accuracy of the flow measurementwill be affected.

5. For ease of operation and maintenance, install manifolds to allow sens-ing lines to be shut off while removing the instrument from the line orperforming a calibration. Appendix A, page 25, shows an example of atypical installation configuration.

6. Locate all shutoff valves so that they are readily accessible from the frontof the instrument. Locate block valves at the source of differential pres-sure lines.

7. Prevent leakage by using a suitable sealing compound on all joints. Mea-surement errors can be caused by leaks in the piping.

Electrical Connections

! WARNING: Ensure that the condulet cover is secure before applyingpower to instrument when used in hazardous areas. Failure to do thismay result in personal injury or property damage.

Flexible cable is recommended for electrical connections to the instrument.

12


Perform the following steps to complete field wiring.1. Connect the power supply and the receiver to the transmitter as shown in

Figures 3.1 and 3.2.2. Determine the total loop resistance required for the installation, using

Figure 3.3, page 13, for reference. The total loop resistance must be less than the maximum calculated value. Table 3.1, page 13, provides loop resistance values for various cable wire sizes.

3. Install a load resistor sized for the application.

! WARNING: Failure to properly calculate power supply DC output voltage may result in inaccurate transmitter readings, possibly leading to safety system performance degradation during design basis events. To avoid equipment inaccuracy hazards, follow the examples and tables in this section for determining the proper power supply DC output voltage.

Figure 3.1—Typical field wiring connections for Model 753A with junction box

Figure 3.2—Typical field wiring connections for Model 753A without junction box

13


Table3.1—CableSpecificationsLoop Resistance/1000 ft

[ohms @ 68°F (20°C)]Cable Wire Size

5.06 14 AWG, 2 Wires

8.04 16 AWG, 2 Wires

12.78 18 AWG, 2 Wires

20.30 20 AWG, 2 Wires

4-20 mA10

-50 m

A

200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000

29001160

70

60

50

40

30

20

10

Total Loop Resistance (Ohms) (Load Transmission Line)

Pow

er S

uppl

y R

ange

(Vol

ts)

Any voltage or resistance within the shaded area for the respective transmitter output is acceptable.

Figure 3.3—Power supply and loop resistance

Care must be exercised when calculating the power supply output voltage. A power supply specified as 50Vdc ±1 volt must be considered a 49Vdc source to ensure the minimum required voltage at the transmitter. Use the actual value when available; otherwise, use "worst case" value.

Use Figure 3.3 as a reference to determine if the maximum calculated value of RT = RLine + RLoad + RExt is correct.

Loop Resistance Calculations

Use the following method to calculate the loop resistance value.

Transmitter Current = IDC (20 mA or 50 mA)

RT = VDC - TVDC

IDC

Total Loop Resistance (RT) = RLine + RLoad + RExtPower Supply Voltage = VDC (70 V max. for 4-20 mA or 10-50 mA Systems)Maximum Transmitter Voltage = TVDC (70 V for both 4-20 mA and 10-50 mA Systems)Minimum Transmitter Voltage = TVDC (12 V for both 4-20 mA and 10-50 mA Systems)

14


Maximum Loop ResistanceExample 1: (Maximum loop resistance for 10-50 mA system):

VDC = 70 Vdc TVDC = 12 Vdc

IDC = 50 mA RT = = 1160 Ohms0.05

70-12

Example 2: (Maximum loop resistance for 4-20 mA system):


IDC = 20 mA RT = = 2,900 Ohms0.02

70-12

Example 3: (Calculation to determine maximum loop resistance withpower supply ≥12 Vdc, but ≤ 70 Vdc for 10-50 mA and 4-20 mA systems):


IDC = 50 mA RT = = 560 Ohms0.05

40-12

IDC = 20 mA RT = = 1400 Ohms0.02

40-12

EMI/RFI Shielding

IMPORTANT: The 753A transmitter has no integral electronic interference suppression features. If an instrument is to be installed in an area containing EMI/RFI sources and this interference cannot be tolerated, take precautions to protect the transmitter signal. An optional EMI/RFI filter is available upon request. Contact the factory for information.

The following precautions are recommended to limit EMI/RFI interference:1. Run signal wires in solid conduit or use high quality shielded cable to

connect the transmitter to the power equipment.2. House the transmitter leads in solid conduit up to the junction box where

the shielded cable is connected to the leads.3. Ground the electronic transmitter, junction box (including the cover),

conduit, and cable shield.

Startup ProcedureTo operate the transmitter, perform the following steps. See the installation diagram in Appendix A, page 25, for typical valve locations.1. Locate the block valves and make sure they are closed.

NOTE: The block valve is normally installed at the facility for the purpose of iso-lating the pressure lines (process being monitored) from the monitoring instruments.

2. Configure the test manifold’s control valves to connect the input pres-sure port of the gage pressure transducer to the appropriate pressure lines(process being monitored). Follow the guidelines in Appendix A that are

15


specific to your piping configuration.3. Open the block valve if applicable (recommended for liquid service, but

not for gas).

IMPORTANT: For gas service, it is recommended that a zero check be performed with the block valve closed. If the gas flow is pulsating, there may be a stand-ing wave effect in the process line which can displace the indicator and appear as a zero error.

4. Apply electrical power to the Model 753A transmitter.5. Check the transmitter calibration across all checkpoints, using the in-

structions provided in Calibration, page 16. If re-adjustment of the zeroand/or span is necessary, perform all 12 steps described in the CalibrationProcedure, page 18.

6. Check the manifold and piping for leaks as follows:a. Open the shutoff valve to pressurize the instrument.b. Close the shutoff valve.c. Check for a change (increase or decrease) in the transmitter output

that could indicate leakage.

IMPORTANT: Be careful not to subject the gage pressure transducer to unnecessary shock or overrange pressure during operations.

Shutdown ProcedureTo shut down operations, perform the following steps. 1. Remove electrical power from the Model 753A transmitter loop.2. Close the shut-off valve.3. Close the main block valve at the process connections.4. Open the vent/drain valve to remove all pressure from the unit.

16


Section 4—Calibration and Maintenance

General Field and Periodic Maintenance


The electronic transmitter circuits are basically maintenance-free and do not require routine preventative maintenance other than a periodic check of cali-bration. See Calibration below for details.

Calibration Each transmitter is calibrated at the factory prior to shipment. A 9-point cali-bration check is recommended upon receipt, and again before the transmitter is operated for the first time. If "as found" values are not within the specified range, a full calibration should be performed.

The transmitter should be recalibrated at periodic intervals, determined primarily by the usage of the transmitter, historical performance, the desired accuracy of the output signal, or indications that the instrument may be out of calibration. If a transmitter is installed after an extended period of storage, a calibration test should be performed before operating the transmitter to ensure correct performance.

Test Equipment

To perform the calibration procedure for an instrument with 0.5% accuracy, the test equipment should meet or exceed the requirements listed in Table 4.1, page 17. For calibrating instruments, the pressure source should have at least 4 times the accuracy of the instrument being tested. In the event equip-ment is substituted that does not meet these requirements, the accuracy of the recalibrated transmitter must be derated accordingly.

17


Table 4.1—Calibration EquipmentEquipment Requirements

Digital Voltmeter ±0.05% of reading accuracy at 10 VDC scale

Power Supply 12-70 Vdc, 60 mA minimum, regulation 3%, ripple 1% (see Electrical Connections, page 11)

Precision Load Resistor 200 ohms, ±0.05%, 1W (10-50 mA transmitter) 500 ohms, ±0.05%, 1W (4-20 mA transmitter)

Pressure Source Provides zero to full scale pressure (Accuracy: 4 times the accuracy of the instrument under test)

Electrical Connections for Calibration

The electrical connections required for calibrating the transmitter are shown in Figure 4.1.

! WARNING: Ensure that the condulet cover is secure before applying power to instrument when used in hazardous areas. Failure to do this may result in personal injury or property damage.

Figure 4.1—Electrical connections for calibration

Flexible cable is recommended for electrical connections to the instrument.Perform the following steps to complete field wiring.1. Connect the power supply and the DC voltmeter to the transmitter as

shown in Figure 4.1.2. Connect a milliammeter as shown, if desired.3. Determine the total loop resistance required for the installation, using

Figure 3.3, page 13, for reference. The total loop resistance must be less than the maximum calculated value. Table 3.1, page 13, provides

18


loop resistance values for various cable wire sizes. 4. Install a load resistor sized for the application.

! WARNING: Failure to properly calculate power supply DC output voltage may result in inaccurate transmitter readings, possibly leading to safety system performance degradation during design basis events. To avoid equipment inaccuracy hazards, follow the examples and tables in this section for determining the proper power supply DC output voltage.

Calibration Checkpoints

Table 4.2 presents the transmitter output values in current and voltage, along with the associated tolerance for instrument with 0.5% accuracy, for both the 4-20 mA and 10-50 mA variations. Instruments are held to the same toler-ances during factory calibration. For calibrating instruments with 0.25%accuracy, divide the tolerances shown by one-half.

Table 4.2—Calibration Checkpoints for Instrument with 0.5% Accuracy

Applied Calibration Pressure Checkpoint

(% of Span)

Output*4-20 mA Transmitter** 10-50 mA Transmitter***Current

(±0.08 mA)Voltage

(±0.04 Vdc)Current

(±0.2 mA)Voltage

(±0.04 Vdc)0% 4 mA 2 Vdc 10 mA 2 Vdc

25% 8 mA 4 Vdc 20 mA 4 Vdc

50% 12 mA 6 Vdc 30 mA 6 Vdc

75% 16 mA 8 Vdc 40 mA 8 Vdc

100% 20 mA 10 Vdc 50 mA 10 Vdc*This value includes the effects of conformance (non-linearity), deadband, hysteresis, and repeatability.**This value was obtained using a 500-ohms load resistor.***This value was obtained using a 200-ohms load resistor.

Calibration Procedure

The following procedure can be used to obtain "as found" calibration values or perform a full calibration.

• To obtain the “as found” calibration values (calibration check only),perform steps 1 through 6 and steps 10 through 12, skipping steps 7through 9.

• For periodic calibration or in cases where the “as found” calibrationvalues do not meet the tolerances specified in Table 4.2, perform all12 steps.

1. Verify that the transmitter is installed in accordance with the mountingguidelines on page 10 and the piping guidelines on page 11.

2. Locate the block valve and make sure it is closed. The block valve is nor-mally installed at the facility to isolate the process being monitored from

19


the monitoring instruments.3. Configure the test manifold control valve to connect the output of the test

pressure source to the input port of the gage pressure transducer.4. Verify that all electrical connections are properly installed (see electrical

connections in Figure 3.1, page 12.5. Apply the appropriate power supply voltage to the transmitter. (To deter-

mine this voltage, see Power Supply, page 4.) 6. Exercise the transmitter by applying 0% and 100% calibration pressures

(specified in Table 4.2, page 18) three times. If performing a calibra-tion check only, proceed to step 10.

7. Apply the calibration pressure for the 0% checkpoint (as specified in Table 4.2, page 18). Adjust the zero control potentiometer as required to produce the recommended output level.

8. Apply the calibration pressure for the 100% checkpoint (as specified in Table 4.2, page 18). Adjust the span control potentiometer as required to produce the recommended output level.

9. Repeat steps 7 and 8 until no further refinements can be made. 10. Apply the calibration pressures referred to in Table 4.2, page 18, start-

ing from 0% to 100%, and record the applied pressures and the output levels at each measurement.

11. Repeat the calibration checks in descending order, from 75% to 0%, and record the applied pressures and the output levels at each measurement.

12. Repeat steps 10 and 11 until you have completed three consecutive runs and have recorded all relevant data.

IMPORTANT: If correct readings cannot be obtained, refer to the troubleshooting sug-gestions in Table 4.3, page 20, or return the unit to the manufacturer for repair and calibration.

20


TroubleshootingRefer to Table 4.3, page 20, for troubleshooting information and Section 5, page 22, for part location.

Table 4.3—Transmitter TroubleshootingProblem Possible

SourceProbable Cause Corrective Action

No Output Power Source

Blown fuse, faulty component

Replace fuse, repair power supply

Transmission Cable

Loose terminal connection Tighten terminal connection; locate and replace broken wire

Receiver (or load)

Blown fuse, faulty component Replace fuse; repair or replace receiver or load

Transmitter Loose terminal, reversed power connection, faulty component

Tighten terminal, reverse power con-nection, return to factory for repair

Transmitter "zeros" but cannot get full output

Power Source

Low voltage Repair power source

Load Resistance

Resistance too high Replace load resis-tance or repair as required

Transmission Cable

Resistance or length of cable in excess of specifications

Measure cable loop resistance and bring within specifications

Electronic Module Amplifier

Loss of gain Return to factory for repair

Out of Calibration

Electronic Component value shifted Recalibrate or return to factory for repair

Erratic or Intermit-tent Operation

Terminal Connections

Loose or dirty Tighten and/or clean as required

Electronic Component

Defective component Return to factory for repair

Strain Gages Physical damage Return to factory for repair

Excess Output (will not "zero")

Transmitter Defective component Return to factory for repair

21


Section 5—Assembly Drawing and Parts List

Figure 5.1—Model 753A assembly drawing

22


Table 5.1—753A Parts List

ITEM DESCRIPTION PART NO. PER UNIT

1 TRANSDUCER ASSEMBLY CONSULT FACTORY 1

4753A PCB ASSY, 4-20 mA 9A-C0752-1269B

1753A PCB ASSY, 10-50 mA 9A-C0752-1270B

5 RING, RTNG, TRUARC 5103-25-H 9A-C0087-0040T 46 COVER, AMER.GRAY 9A-C0039-1045C 17 CASE ASSY 9A-C0753-1047B 18 BRACKET, MOUNTING - PIPE YOKE 9A-C0752-1026C 19 STANDOFF,1/4 HEX X 1-3/4,8-32M 9A-C0753-1006C 410 PLATE ASSEMBLY 9A-C0753-1010B 111 DATA PLATE, TRANSMITTER 9A-C0752-1172G 112 O-RING, 2-239, EPT E4 9A-C0001-1105R 113 CHAIN, BEADED 3 INCH LONG 9A-C0076-0007T 214 CAP 9A-C0752-1004C 215 SPRING AND SHAFT ASSEMBLY 9A-C0752-1100B 216 DRIVE SCREW,#00 9A-C0600-1001J 417 DRIVE SCREW,#2 X 3/16,SST 9A-C0600-1004J 419 O-RING, 2-012, EPT E4 9A-C0001-1051R 220 SCREW, PAN SL HD 6-32 X 3/8 9A-C0119-0007J 421 SCR, PAN HD, 6-32 X 1/4, SST 9A-C0119-0016J 222 WASHER, LOCK, IT, #6, SST 9A-C0003-0070K 623 TERMINAL BRACKET 9A-C0752-1112C 124 WASHER,LOCK, INTERNAL TOOTH - #8 STNL ST 9A-C0003-0066K 425 STRIP, MARKER - SILKSCREEN 9A-C0752-1113C 126 SCR, PAN HD, 8-32 X 1/4,316 SS 9A-C0119-0006J 227 SCR, PAN HD, 8-32 X 1/2,316 SS 9A-C0119-0005J 228 WIRE ASSEMBLY, RED 9A-C0752-1119B 129 WIRE ASSEMBLY, BLACK 9A-C0752-1120B 130 I.D. PLATE-SPAN ADJUST 9A-C0752-1121C 131 I.D. PLATE - ZERO ADJUST 9A-C0752-1122C 133 O-RING,2-214,EPT E4 9A-C0001-1077R 134 PLUG, DRAIN, X-PRF 9A-C0186-0001T 135 JUNCTION BOX 9A-C0752-1114C 136 TERMINAL BLOCK, 5 POSITION 9A-C0038-1170T 137 ADAPTER 9A-C0752-1111C 238 CONDUIT HUB 9A-C0024-1006T 239 O-RING, 2-115, EPT E4 9A-C0001-1130R 240 WASHER, SPLIT LOCK, #10, SST 9A-C0003-0032K 441 SCR, PAN HD, 10-32 X 7/16, SST 9A-C0119-0014J 442 HUMISEAL 9A-C0006-1007U A/R43 TAG, IDENTIFICATION (NOT SHOWN) 9A-C0199-0125C 1* GREASE, HIGH VACUUM DOW CORNING 9A-C0002-1003U A/RNotes:*Prior to installation, lubricate O-rings (Items 12, 19, 33 and 39) with HIVAC grease.

23


Section 6—Dimensional Drawings

Figure 6.1—Model 753A transmitter with junction box, front view

Figure 6.2—Model 753A transmitter with junction box, side view

24


Figure 6.3—Model 753A transmitter with junction box, bottom view

25

Model 753A Gage Pressure Transmitter

Appendix A

Safety PrecautionsSuggested piping diagrams and startup instructions for a typical application is presented below.

! WARNING: HIGH-PRESSURE HAZARD. TO PREVENT PERSONALINJURY OR DAMAGE TO EQUIPMENT, DIRECT ALL PIPING AWAY FROMTHE OPERATOR WHILE CONNECTING THE GAGE TRANSMITTER TOTHE SYSTEM PIPING.

! WARNING: EXPLOSION HAZARD. NO ORGANIC COMPOUNDS, OIL,GREASE, DIRT, OR SCALE OF ANY KIND CAN BE TOLERATED IN ANOXYGEN INSTALLATION.

Flow Application

IMPORTANT: Assure that the Gage Pressure Transducer input port is connected to the primary device.

IMPORTANT: To prevent overheating the Gage Pressure Transducer during blowdown, monitor the temperature by placing your hands on the pipe between the transducer and the manifold pipe containing the vent valves.

Typical Piping/Startup Example

Gas Flow

The following steps are recommended for a typical gas flow application.1. Open the main block valve with the drain/vent valves closed (Figure

A-1).2. Slowly open the shutoff valve to pressurize the instrument.3. Open the drain/vent valve(s) to bleed off any entrapped gas and then

close them.

Figure A.1—Gas flow

26

Model 753A Gage Pressure Transmitter

Product Warranty

A. WarrantyCameron International Corporation (“Cameron”) warrants that at the time of shipment, the products manufactured by Cameron and sold hereunder will be free from defects in mate-rial and workmanship, and will conform to the specifications furnished by or approved by Cameron.

B. Warranty Adjustment1. If any defect within this warranty appears, Buyer shall notify Cameron immediately2. Cameron agrees to repair or furnish a replacement for, but not install, any product

which within one (1) year from the date of shipment by Cameron shall, upon test and examination by Cameron, prove defective within the above warranty.

3. No product will be accepted for return or replacement without the written authoriza-tion of Cameron. Upon such authorization, and in accordance with instructions by Cameron, the product will be returned shipping charges prepaid by Buyer. Replace-ments made under this warranty will be shipped prepaid.

C. Exclusions from Warranty1. THE FOREGOING WARRANTY IS IN LIEU OF AND EXCLUDES ALL OTHER

EXPRESSED OR IMPLIED WARRANTIES OF MERCHANTABILITY, OR FIT-NESS FOR A PARTICULAR PURPOSE, OR OTHERWISE.

2. Components manufactured by any supplier other than Cameron shall bear only the warranty made by the manufacturer of that product, and Cameron assumes no respon-sibility for the performance or reliability of the unit as a whole.

3. “In no event shall Cameron be liable for indirect, incidental, or consequential dam-ages nor shall the liability of Cameron arising in connection with any products sold hereunder (whether such liability arises from a claim based on contract, warranty, tort, or otherwise) exceed the actual amount paid by Buyer to Cameron for the products delivered hereunder.”

4. The warranty does not extend to any product manufactured by Cameron which has been subjected to misuse, neglect, accident, improper installation or to use in violation of instructions furnished by Cameron.

5. The warranty does not extend to or apply to any unit which has been repaired or altered at any place other than at Cameron’s factory or service locations by persons not expressly approved by Cameron.

Product Brand

Barton® is a registered trademark of Cameron International Corporation (“Cameron”).

Cameron, a Schlumberger Company

Cameron Energy Services Corp.4040 Capitol AveCity of Industry, CA 90601Phone: 562.222.8440Fax: 562.222.8446https://www.products.slb.com/

Barton is a registered trademark of Cameron.© 2012 Cameron International Corporation (“Cameron”). All information contained in this publication is confidential and proprietary property of Cameron. Any reproduction or useof these instructions, drawings, or photographs without the express written permis-sion of an officer of Cameron is forbidden.

All Rights Reserved.Printed in the United States of America.

barton 753a gauge pressure transmitter user manual

Documents