Cameron BARTON 764 User Manual

Differential pressure transmitter

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Section 1—Introduction ................................................................................. 5

General ......................................................................................................... 5

Product Description....................................................................................... 5

Differential Pressure Unit (DPU) ............................................................... 5

Electronic Transmitter................................................................................ 5

Power Supply ............................................................................................ 5

Specifications ................................................................................................ 6

Performance .............................................................................................. 6

Application ................................................................................................. 7

Storage: ..................................................................................................... 8

Section 2—Theory of Operation .................................................................... 9

Basic Components ........................................................................................ 9

Differential Pressure Unit (DPU) ............................................................... 9

Draining or Venting.....................................................................................9

Temperature Compensation......................................................................10

Bellows......................................................................................................10

Strain Gage Assembly...............................................................................10

Range Springs..........................................................................................10

Electronic Transmitter...............................................................................10

Basic Operation ...........................................................................................11

Reverse Polarity Protection ......................................................................11

Regulator ................................................................................................. 12

Strain Gage Bridge Network.................................................................... 12

Signal Amplifier........................................................................................ 12

Current Amplifier...................................................................................... 12

Temperature Compensation........................................................................ 12

Section 3—Installation and Operation ........................................................ 13

Unpacking/Inspection.................................................................................. 13

Pre-Operating Instructions .......................................................................... 13

Mounting ..................................................................................................... 13

BARTON

DIFFERENTIAL PRESSURE

Part No. 9A-C10880, Rev. 05

MODEL 764

TRANSMITTER

User Manual

January 2020

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Page 1 ® BARTON MODEL 764 DIFFERENTIAL PRESSURE TRANSMITTER User Manual Part No. 9A-C10880, Rev. 05 January 2020 Contents Section 1—Introduction ................. 5 General ......................5 Product Description..................5 Differential Pressure Unit (DPU) ............... 5 Electronic Transmitter................5 Power Supply .................... 5 Specifications ....................
Page 2: Table Of Contents
Table of Contents Model 764 Differential Pressure Transmitter Vibration ....................13 Piping ......................14 Distance ....................14 Slope ....................... 14 Process Temperature ................14 Pulsation....................14 Leakage....................14 High-Pressure Connection ................14 Manifolding....................14 Electrical Connections................. 15 Load and Line Resistance Calculations ..........16 EMI/RFI Shielding ..................
Page 3 Model 764 Differential Pressure Transmitter Table of Contents Safety Before installing this product, become familiar with the installation instruc- tions presented in Section 3 and all safety notes throughout. W ARNING: This symbol identifies information about practices or circum- stances that can lead to personal injury or death, property damage, or economic loss.
Page 4 Table of Contents Model 764 Differential Pressure Transmitter...
Page 5 Model 764 Differential Pressure Transmitter Section 1 Section 1—Introduction General The Model 764 Differential Pressure Transmitter provides a 4-20 mA or 10- 50 mA proportional-to-differential pressure signal for transmission to remote receiving, control, or readout devices. The electronic components of the Model 764 transmitter are housed in a pressure-sealed enclosure.
Page 6 Section 1 Model 764 Differential Pressure Transmitter Specifications Performance Input Range ........0-60 inches (water column) to 0-320 psid Output ..........4-20 mA or 10-50 mA, direct and reverse acting Reference Accuracy* ...... ±0.5% of factory-calibrated span, including effects of conformance (non-linearity), deadband, hysteresis, and repeatability Adjustability ........
Page 7 Model 764 Differential Pressure Transmitter Section 1 LOCA Performance* ....... < ±5.0% error during the first five minutes of LOCA (420°F) < ±10.0% error thereafter to the conclusion of the LOCA test, as performed per Document No. 9A-CR3-764-9 The LOCA errors include the cumulative effects of thermal, mechanical, radiation, and seismic aging, as performed per Document No.
Page 8 Section 1 Model 764 Differential Pressure Transmitter DBE Environment ......Two 10-second temperature ramps to 486ºF maxi- mum; 24 hour duration chemical spray exposure; 15 day total exposure to saturated steam at 250ºF minimum Long Term Severe Environment ..85 days at 200ºF and 95% RH Seismic Qualifications ....
Page 9 Model 764 Differential Pressure Transmitter Section 2 Section 2—Theory of Operation Basic Components Differential Pressure Unit (DPU) Valve Stem HP Housing LP Housing HP Bellows LP Bellows Figure 2.1—DPU The differential pressure range of the dual-bellows type DPU is determined by the force required to move the bellows through their normal range of travel.
Page 10 Section 2 Model 764 Differential Pressure Transmitter when the unit is used in liquid installations, when installed in accordance with standard practices. Temperature Compensation. The high pressure side of the DPU has extra bellows convolutions to provide for expansion and contraction of the fill liquid caused by ambient temperature changes.
Page 11 Model 764 Differential Pressure Transmitter Section 2 compression decreases in resistance. The two gages are connected to form two active arms of a bridge circuit. The bridge output signal is conditioned and converted to a 4-20 mA or 10-50 mA output signal by the transmitter electronics.
Page 12 Section 2 Model 764 Differential Pressure Transmitter 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. 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...
Page 13: Vibration
Model 764 Differential Pressure Transmitter Section 3 Section 3—Installation and Operation WARNING: Failure to follow instructions for removing the transmitter cover may damage the transmitter cover and case. This could result in a serious degradation of transmitter performance during design basis events, resulting in a potential degradation of safety systems.
Page 14: Piping
Section 3 Model 764 Differential Pressure Transmitter Piping The practices described in this section should be followed for all instrument piping. Distance The distance between the primary device and the instrument should be as short as possible. Slope Slope all piping at least one inch per linear foot to prevent liquid or gas en- trapment in the lines or the instrument.
Page 15: Electrical Connections
Model 764 Differential Pressure Transmitter Section 3 Electrical Connections 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.
Page 16: Load And Line Resistance Calculations
Section 3 Model 764 Differential Pressure Transmitter Minimum resistance is based upon maximum transmitter power dissipation (Watts) at the maximum design temperature conditions, and qualified life limited by heat rise. For proper operation at post-accident conditions, this minimum resistance must exist. Figure 3.2—Power supply and loop resistance Load and Line Resistance Calculations Use the following method to calculate values of load and line resistance:...
Page 17 Model 764 Differential Pressure Transmitter Section 3 Example 2 : (Maximum loop resistance for 4-20 mA system): = 53 Vdc = 15 Vdc = 20 mA = (53-15) / 0.02 = 1900 Ohms Example 3 : (Calculation to determine maximum loop resistance with power supply ≥...
Page 18: Emi/Rfi Shielding
Section 3 Model 764 Differential Pressure Transmitter EMI/RFI Shielding IMPORTANT: The Model 764 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.
Page 19: Initial Calibration Adjustments
Model 764 Differential Pressure Transmitter Section 3 Initial Calibration Adjustments 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. Accuracy of the test equipment used for the calibration test should be ap- proximately four times the accuracy of the instrument under test.
Page 20 Section 3 Model 764 Differential Pressure Transmitter Figure 3.3—Electrical connections for calibration Table 3.1—Calibration Checkpoints Applied Calibration Output* Pressure Check- 4-20 mA Transmitter** 10-50 mA Transmitter*** point (% of Full Current Voltage Current Voltage Scale) (±0.08 mA) (±0.04 Vdc (±0.2 mA) (±0.04 Vdc) 4 mA 2 Vdc...
Page 21: Startup Procedure
Model 764 Differential Pressure Transmitter Section 3 Startup Procedure To operate the transmitter, perform the following steps. Close the transmitter shut-off valves. Close the transmitter drain valves and calibration connection valves. Open the main block valves at the process connections. Slowly open the transmitter shut-off valves.
Page 22: Section 4-Maintenance
Section 4 Model 764 Differential Pressure Transmitter Section 4—Maintenance General Field and Periodic Maintenance The electronic transmitter is basically maintenance-free and does not require a routine preventative maintenance program other than periodic calibration checks. WARNING: Except for cleaning the DPU and replacement of O-rings, fas- teners, and connector assemblies, no field repair or component replace- ment on the Model 764 transmitter is authorized.
Page 23: Periodic Calibration
Model 764 Differential Pressure Transmitter Section 4 All O-rings exposed during the preceding steps must be discarded. New O-rings installed during reassembly must be identical to those removed. Consult parts list (Table 5.1, 33) for correct part numbers. O- page rings should be given a light application of silicone grease prior to instal- lation.
Page 24 Section 4 Model 764 Differential Pressure Transmitter socket or a wrench. IMPORTANT: If there are no calibration access plugs in the cover, the cover must be removed to adjust calibration (see Transmitter Cover Removal, page 25). Connect the electrical readout device to the transmitter as shown in Fig- page 20, for either current or voltage readout.
Page 25: Transmitter Cover Removal
Model 764 Differential Pressure Transmitter Section 4 Transmitter Cover Removal WARNING: Never pry on the transmitter cover to remove it. The trans- mitter cover and/or case may be damaged. Operating a transmitter with a damaged cover and/or case may result in a serious degradation of transmitter performance during design basis events, resulting in a poten- tial degradation of safety systems.
Page 26: Operation Of The Egs Quick Disconnect Connector Assembly
Section 4 Model 764 Differential Pressure Transmitter Operation of the EGS Quick Disconnect Connector Assembly IMPORTANT: Make sure that the O-ring and the connector sealing surface are clean prior to performing the following steps. To secure the connector in a locked position, perform the following steps: Place the O-ring (Part No.
Page 27: Lead Wire/Connector Replacement
Cameron. The Barton style connector assembly previously used with Model 764 transmitters is not manufactured by Cameron and is no longer available for purchase. The EGS Quick Disconnect connector is an ideal replacement for the Barton connector assembly.
Page 28 Section 4 Model 764 Differential Pressure Transmitter hub in place with a wrench, carefully thread the QDC into the transmitter conduit hub and tighten to 50 to 75 ft-lb. Take care to protect the QDC leads during the connector tightening process. Connect the red and black signal leads to the transmitter circuit board (TB 1-7 &...
Page 29: Removal Of The Barton Style Connector Assembly
Removal of the Barton Style Connector Assembly A special connector tool is required for removal of the Barton style connector assembly, and is available from Cameron (Part No. 9A-0764-1174B). To remove the Barton style connector assembly, perform the following steps.
Page 30 Section 4 Model 764 Differential Pressure Transmitter Figure 4.3—Wiring for connector assembly (lead wire) replacement, shown with Barton style connector assembly...
Page 31: Troubleshooting
Model 764 Differential Pressure Transmitter Section 4 Troubleshooting WARNING: Except for cleaning the DPU and replacement of O-rings, fas- teners, and connector assemblies, no field repair or component replace- ment on the Model 764 transmitter is authorized. Unauthorized repairs void any certification to qualification reports for design basis event performance. Table 4.3—Troubleshooting Problem Possible Source Probable Cause Corrective Action No Output Power Source Blown fuse, faulty...
Page 32: Section 5-Assembly Drawing And Parts List
Section 5 Model 764 Differential Pressure Transmitter Section 5—Assembly Drawing and Parts List Figure 5.1—Model 764 assembly...
Page 33 Model 764 Differential Pressure Transmitter Section 5 WARNING: Except for cleaning the DPU, replacing O-rings, or replacing connector assembly, no field repair or component replacement on the Model 764 transmitter is authorized, if it is desirable to maintain certifica- tion of the instrument. Table 5.1—Model 764 Replacement Parts ITEM DESCRIPTION PART NO. UNIT Bolt, Hex Hd., 1/4-28 x 5/8 9A-C0116-1007J Washer, Lock, 1/4 9A-C0003-0037K Washer, Flat, 1/4...
Page 34: Section 6-Dimensional Drawings
Section 6 Model 764 Differential Pressure Transmitter Section 6—Dimensional Drawings Figure 6.1—Model 764 transmitter, front view (connector assembly not shown) Figure 6.2—Model 764 transmitter, rear view (connector assembly not shown) [109.54] Figure 6.3—Model 764 transmitter side view...
Page 35: 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 36 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 permission of an officer of Cameron is forbidden.

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