Table of Contents
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Contents
Safety ............................................................................................................ 2
Section 1-Introduction ................................................................................. 3
General ......................................................................................................... 3
Product Description....................................................................................... 3
Gage Pressure Transducer ...................................................................... 3
Electronic Transmitter................................................................................ 3
Power Supply ............................................................................................ 4
Zero and Span Control.................................................................................. 4
Zero Control .............................................................................................. 4
Span Control ............................................................................................. 4
Specifications ............................................................................................... 5
Section 2-Theory of Operation .................................................................... 7
Basic Components ........................................................................................ 7
Gage Pressure Transducer ....................................................................... 7
Electronic Transmitter................................................................................ 7
Basic Operation ............................................................................................ 7
Surge Voltage Protection Circuit .............................................................. 8
Reverse Polarity Protection ....................................................................... 8
Regulator ................................................................................................... 8
Strain Gage Bridge Network ..................................................................... 8
Signal Amplifier.......................................................................................... 9
Current Amplifier........................................................................................ 9
Temperature Compensation.......................................................................... 9
Section 3-Installation, Startup, and Shutdown ........................................ 10
Overview ..................................................................................................... 10
Unpacking/Inspection.................................................................................. 10
Initial Calibration Check .............................................................................. 10
Mounting ..................................................................................................... 10
Wall or Rack Mounting ............................................................................ 10
Piping Guidelines .........................................................................................11
Electrical Connections ................................................................................11
Loop Resistance Calculations ................................................................. 13
Maximum Loop Resistance ..................................................................... 14
BARTON
GAGE PRESSURE TRANSMITTER
MODEL 753A
®
User Manual
Part No. 9A-10840, Rev. 02
March 2020
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Summary of Contents for Cameron BARTON 753A
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Page 1: Table Of Contents
BARTON MODEL 753A ® GAGE PRESSURE TRANSMITTER User Manual Part No. 9A-10840, Rev. 02 March 2020 Contents Safety ......................2 Section 1—Introduction ................. 3 General ......................3 Product Description..................3 Gage Pressure Transducer ..............3 Electronic Transmitter................3 Power Supply .................... 4 Zero and Span Control.................. -
Page 2: Safety
EMI/RFI Shielding..................14 Startup Procedure..................14 Shutdown Procedure..................15 Section 4—Calibration and Maintenance.............16 General Field and Periodic Maintenance............16 Electronic Transmitter................16 Calibration.....................16 Test Equipment.....................16 Electrical Connections for Calibration............17 Calibration Checkpoints................18 Calibration Procedure................18 Troubleshooting....................20 Section 5-Assembly Drawing and Parts List..........21 Section 6-Dimensional Drawings..............23 Appendix A.....................25 Safety Precautions..................25 Flow Application..................25 Typical Piping/Startup Example..............25... -
Page 3: Section 1-Introduction
Model 753A Gage Pressure Transmitter Section 1 Section 1—Introduction General The 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;... -
Page 4: Power Supply
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 Table 3.1, page 13 shows the resistances in ohms... -
Page 5: Specifications
Model 753A Gage Pressure Transmitter Section 1 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. % OF FULL SCALE DP RANGE Figure 1.2—Output calibrated to upper limit of DP range Specifications Input Range ........ - Page 6 Section 1 Model 753A Gage Pressure Transmitter Power Supply Effect* 4-20 mA ........±0.025% of factory-calibrated span per 1 Volt change 10-50 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)........
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Page 7: Section 2-Theory Of Operation
Model 753A Gage Pressure Transmitter Section 2 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. -
Page 8: Surge Voltage Protection Circuit
Section 2 Model 753A Gage Pressure Transmitter 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. -
Page 9: Signal Amplifier
Model 753A Gage Pressure Transmitter Section 2 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. -
Page 10: Section 3-Installation, Startup, And Shutdown
Section 3 Model 753A Gage Pressure Transmitter Section 3—Installation, Startup, and Shutdown Overview This 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 •... -
Page 11: Piping Guidelines
Model 753A Gage Pressure Transmitter Section 3 Piping Guidelines Observe the following practices when piping for flow and liquid level ap- plications. 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. - Page 12 Section 3 Model 753A Gage Pressure Transmitter 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.
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Page 13: Loop Resistance Calculations
Model 753A Gage Pressure Transmitter Section 3 Table 3.1—Cable Specifications Loop Resistance/1000 ft Cable Wire Size [ohms @ 68°F (20°C)] 5.06 14 AWG, 2 Wires 8.04 16 AWG, 2 Wires 12.78 18 AWG, 2 Wires 20.30 20 AWG, 2 Wires 2900 1160 Any voltage or resistance within the shaded area for the respective transmitter output is acceptable. -
Page 14: Maximum Loop Resistance
Section 3 Model 753A Gage Pressure Transmitter Maximum Loop Resistance Example 1: (Maximum loop resistance for 10-50 mA system): = 70 Vdc = 12 Vdc 70-12 = 50 mA = 1160 Ohms 0.05 Example 2: (Maximum loop resistance for 4-20 mA system): = 70 Vdc = 12 Vdc 70-12... -
Page 15: Shutdown Procedure
Model 753A Gage Pressure Transmitter Section 3 specific to your piping configuration. 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. -
Page 16: Section 4-Calibration And Maintenance
Section 4 Model 753A Gage Pressure Transmitter Section 4—Calibration and Maintenance General Field and Periodic Maintenance Electronic Transmitter 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. -
Page 17: Electrical Connections For Calibration
Model 753A Gage Pressure Transmitter Section 4 Table 4.1—Calibration Equipment Equipment 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 Precision Load Resistor 200 ohms, ±0.05%, 1W (10-50 mA transmitter) 500 ohms, ±0.05%, 1W (4-20 mA transmitter) Pressure Source... -
Page 18: Calibration Checkpoints
Section 4 Model 753A Gage Pressure Transmitter 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. - Page 19 Model 753A Gage Pressure Transmitter Section 4 the monitoring instruments. Configure the test manifold control valve to connect the output of the test pressure source to the input port of the gage pressure transducer. Verify that all electrical connections are properly installed (see electrical connections in Figure 3.1, page 5.
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Page 20: Troubleshooting
Section 4 Model 753A Gage Pressure Transmitter Troubleshooting Refer to Table 4.3, page 20, for troubleshooting information and Section 5, page 22, for part location. Table 4.3—Transmitter Troubleshooting Problem Possible Probable Cause Corrective Action Source No Output Power Blown fuse, faulty Replace fuse, repair Source component... -
Page 21: Section 5-Assembly Drawing And Parts List
Model 753A Gage Pressure Transmitter Section 5 Section 5—Assembly Drawing and Parts List Figure 5.1—Model 753A assembly drawing... - Page 22 Section 5 Model 753A Gage Pressure Transmitter Table 5.1—753A Parts List ITEM DESCRIPTION PART NO. UNIT TRANSDUCER ASSEMBLY CONSULT FACTORY 753A PCB ASSY, 4-20 mA 9A-C0752-1269B 753A PCB ASSY, 10-50 mA 9A-C0752-1270B RING, RTNG, TRUARC 5103-25-H 9A-C0087-0040T COVER, AMER.GRAY 9A-C0039-1045C CASE ASSY 9A-C0753-1047B BRACKET, MOUNTING - PIPE YOKE...
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Page 23: Section 6-Dimensional Drawings
Model 753A Gage Pressure Transmitter Section 6 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... - Page 24 Section 6 Model 753A Gage Pressure Transmitter Figure 6.3—Model 753A transmitter with junction box, bottom view...
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Page 25: Safety Precautions
Model 753A Gage Pressure Transmitter Appendix A Safety Precautions Suggested piping diagrams and startup instructions for a typical application is presented below. WARNING: HIGH-PRESSURE HAZARD. TO PREVENT PERSONAL INJURY OR DAMAGE TO EQUIPMENT, DIRECT ALL PIPING AWAY FROM THE OPERATOR WHILE CONNECTING THE GAGE TRANSMITTER TO THE SYSTEM PIPING. -
Page 26: Product Warranty
If any defect within this warranty appears, Buyer shall notify Cameron immediately 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. - Page 27 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.
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