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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)

Figure 6.3—Model 764 transmitter side view

[109.54]

Summary of Contents for BARTON 764

Page 1: ...orage 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 Electr...

Page 2: ...ic Maintenance 22 DPU Inspection and Cleaning 22 Pressure Check 22 Cleaning the DPU 22 Periodic Calibration 23 Transmitter Cover Removal 25 Transmitter Cover Reinstallation 25 Operation of the EGS Qui...

Page 3: ...ntifies information about practices or circum stances that can lead to personal injury or death property damage or economic loss CAUTION Indicates actions or procedures which if not performed correctl...

Page 4: ...Table of Contents Model 764 Differential Pressure Transmitter...

Page 5: ...receiving control and readout equipment The in strument utilizes electronic circuits and a molecular bonded strain gage sens ing cantilever beam actuated directly by the bellows travel within the DPU...

Page 6: ...5 VDC per 100 Ohm load to 52 1 VDC 53 VDC maximum for 10 50 mA Load Range includes line and receiver 50 Ohms per volt above 15 VDC 4 20 mA 20 Ohms per volt above 15 VDC 10 50 mA Load Effect 0 05 of f...

Page 7: ...nit Process Connections 1 4 and 1 2 NPT on both high and low pressure sides Weight 20 5 pounds Electrical Interface 2 wire 16 AWG pigtail 20 long Note Turndown has a directly proportional effect on th...

Page 8: ...H Seismic Qualifications OBE 9 0 G series of 5 SSE 12 5 G 5 critical damping no resonance in frequencies below 75 Hz Mechanical Aging 500 000 pressure cycles during accelerated aging Cycled electrical...

Page 9: ...e strain gage beam which is actuated directly by the valve stem connect ing the two bellows If the bellows are subjected to a pressure greater than the differential pressure range of the DPU they will...

Page 10: ...gage beam The end of the strain gage beam is installed directly into a cutout in the valve stem con necting the two bellows of the DPU Any movement of the bellows in either direction causes a correspo...

Page 11: ...g 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 main current flo...

Page 12: ...tage 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 proporti...

Page 13: ...emoved only in a clean area Pre Operating Instructions The following steps must be performed at the time of installation to ensure that the instrument will perform to its original calibration 1 Verify...

Page 14: ...liquid applica tions to prevent gas entrapment Process Temperature If the process temperature exceeds 135 F provide a minimum of 1 foot of un insulated pipe between the instrument and the primary dev...

Page 15: ...ply DC output voltage Field wiring connections for the transmitter are presented in Figure 3 1 If the transmitter is equipped with an EGS Quick Disconnect connector assembly make sure the two halves o...

Page 16: ...and Line Resistance Calculations Use the following method to calculate values of load and line resistance Total Loop Resistance RT RLine RLoad RExt Power Supply Voltage VDC 53 V max for 4 20 mA or 10...

Page 17: ...supply if RLoad 200 Ohms Ex ample 1 maximum loop resistance and Example 4 minimum loop resis tance then RExt RLine must be 480 Ohms but 560 Ohms to satisfy both the maximum and minimum loop resistanc...

Page 18: ...take precau tions to protect the transmitter signal The following precautions are recommended to limit EMI RFI interference 1 Run signal wires in solid conduit or use high quality shielded cable to co...

Page 19: ...d to adjust calibration See Transmitter Cover Removal page 25 for instructions 2 Connect the electrical readout device to the transmitter as shown in Fig ure 3 3 for either current or voltage readout...

Page 20: ...mance non linearity deadband hysteresis and repeatability This value was obtained using a 500 Ohm load resistor This value was obtained using a 200 Ohm load resistor 7 Replace the calibration access p...

Page 21: ...Open the main block valves at the process connections 4 Slowly open the transmitter shut off valves 5 Apply electrical power to the transmitter loop Shutdown Procedure To shut down operations perform...

Page 22: ...the following pressure check procedure Pressure Check 1 Back off all housing bolts approximately 4 turns 2 Check for internal pressure by attempting to move the housing in and out along the bolts a If...

Page 23: ...n should consist of at least nine checkpoints from minimum to full scale calibrated pressure and back to minimum For optimum results the test equipment should meet the requirements noted in Table 4 1...

Page 24: ...ro and span potentiometers as required Table 4 2 Calibration Checkpoints Applied Calibration Pressure Checkpoint of Full Scale Output 4 20 mA Transmitter 10 50 mA Transmitter Current 0 08 mA Voltage 0...

Page 25: ...cap screws to break the seal between the cover and the O ring 4 Remove the cap screws from the jackholes and lift the cover from the instrument Transmitter Cover Reinstallation IMPORTANT Replacement...

Page 26: ...nt NOTE The EGS qualification report requires that the QDC O ring be replaced whenever the QDC is reconnected after one week or more installed service 2 Align the connector halves by positioning the m...

Page 27: ...2 Remove the transmitter cover see procedure on page 25 3 Disconnect the red and black signal leads from the transmitter circuit board TB 1 7 TB 2 6 as shown in Figure 4 2 page 28 4 Loosen or remove t...

Page 28: ...DC leads during the connector tightening process 4 Connect the red and black signal leads to the transmitter circuit board TB 1 7 TB 2 6 as shown in Figure 4 2 5 Install tighten the two base screws on...

Page 29: ...and carefully unscrew and remove the connector as sembly connector and two O rings as shown in Figure 4 3 page 30 Installation of the Barton Style Connector Assembly To install a Barton style connecto...

Page 30: ...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: ...zeros but cannot get full output Power Source Low voltage Repair power source Load Resistance Resistance too high Replace load resistance or repair as required Transmission Cable Resistance or length...

Page 32: ...32 Section 5 Model 764 Differential Pressure Transmitter Section 5 Assembly Drawing and Parts List Figure 5 1 Model 764 assembly...

Page 33: ...C0199 0215C 2 9 Assembly Connector EGS QDC 9A C0764 1304B 1 10 O ring Case 9A C0001 1057R 1 11 O ring Cover 9A C0001 1056R 1 12 Case Cover standard external adjustment 9A C0764 1262B 1 13 Case Cover...

Page 34: ...ure 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 Figure 6...

Page 35: ...G 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 tha...

Page 36: ...gistered 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...

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