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Disclaimer:   

No representations or warranties are made with respect to the contents of this Installation Guide.  GP:50 reserves the right to revise this guide                   

and  to make changes periodically to the content hereof, without obligation to notify any persons of such revisions.

1. INTRODUCTION

1.1

Product Description 

The Model 311 is an oil field service pressure transmitter with a ¼”NPT(F) pressure port fitting (standard -
optional ports available), 4-20 mA output and measures pressures up to 75,000 psi (5168 bar).   

1.2

Warning

Pressurized vessels and associated equipment are potentially dangerous.  The product described
in the guide should be operated only by personnel trained in the procedures that will assure safety to
themselves, to others, to the equipment, and to the product.  Specific warnings are noted as
in specific installation/operation sections.                    

1.3

Unpacking and Inspection

The Model 311 was carefully tested, inspected and packed.  Upon receipt of the shipment thoroughly 
inspect the transducer.  If you see any visible signs of obvious shipping damage, notify the freight                            
company immediately. 

1.4

Using this manual

This manual is intended to help the end user install, maintain, and provide general service of the GP:50
Model 311 pressure transmitter.  The user should have a general understanding of current loops &  gen-
eral instrument control.  The Model 311 is a precision instrument and should be given the same care as 
any other precision instrument during installation and operation.                                

INSTALLATION

1.5

Mounting/Process Connection

The standard Model 311 transducer is supplied with a ¼” NPT(F) pressure port.  Installation of the device
shall be in accordance with industry standard pipe fitting requirements for this size .Torque shall only be
applied to the transducer during installation (or removal) from the wrench flats provided on the pressure
port.  As a general rule of thumb, the device shall be torqued  “wrench-tight” to preclude leakage from the      
process connection.  Contact GP:50 sales personnel  for additional information if required, or for specific
installation requirements for non-standard process connections.          

Insure media is compatible with 15-5 SST (standard material, optional materials available, check part
number (Appendix A) to verify wetted material) to avoid premature corrosion of the diaphragm. This can    
cause performance degradation and eventual sensor rupture/failure.

Properly tighten process connections before applying pressure to insure no leaks or mechanical failure
can occur.    

Never insert sharp objects into diaphragm.  This could cause permanent damage the sensor and / or
mechanical failure/diaphragm rupture.   

1.6

Power Supply Connection

For best operation the pressure transmitter needs clean, regulated power with an output impedanance
less than 20 ohms.  Minimum voltage is 10 volts with no resistive loading, to a maximum of 36 Vdc 
(Z, P + X Series) (28 Vdc for I, AI + GI Series units). As loads are added to the current loop (galvanic bar 
riers, current measuring devices resistors), the minimum excitation voltage must increase in order to 
maintain proper operating voltage.  

Exceeding maximum supply voltage can damage electronics and cause malfunctions or failure. With In-
trinsically Safe units, this can cause an explosion. Please refer to the attached IS connection diagram   
(Appendix B), and applicable local codes, for proper electrical installation.
Always inspect/clean electrical connection and sealing surface prior to installation.

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Summary of Contents for 311

Page 1: ...tion Mounting process connection Power Supply Wiring Grounding Environment 3 Operation Maintenance Handling 4 Trouble Shooting Return Information 5 Warranty 6 Appendix A Specs Specs performance physical Part number configuration Available accessories 7 Appendix B Approval info C of C s D of C s INSTALLATION MANUAL INSTALLATION MANUAL www GlobalTestSupply com Find Quality Products Online at sales G...

Page 2: ...standard pipe fitting requirements for this size Torque shall only be applied to the transducer during installation or removal from the wrench flats provided on the pressure port As a general rule of thumb the device shall be torqued wrench tight to preclude leakage from the process connection Contact GP 50 sales personnel for additional information if required or for specific installation require...

Page 3: ...RES TOGETHER OR CLOSE SHUNT SWITCH SUPPLIED BY END USER TO ACTIVATE SHUNT Install only after verifying both input power and line pressure are off and at zero Avoid contact with exposed leads or connector pins high voltage may be present on leads and can cause electrical shock Observe safe ESD handling precautions to avoid static damage to sensitive components 1 8 Environment The typical operating ...

Page 4: ... requirements Check wiring connections Verify pressure if being applied Verify output load is not shorted Erratic output or zero drift Verify pressure applied is constant Verify power supply remains within specifications Inspect electrical connections for discontinuity or damage Verify output with a multi meter Check insulation resistance between amplifier and transmitter case Slow Response Verify...

Page 5: ...y GP 50 as shown in its shipping documents subject to the following terms and conditions Without charge GP 50 will repair or replace products found to be defective in materials or workmanship within the warranty period provided that 1 The product has not been subjected to abuse neglect accident incorrect wiring not provided by GP 50 improper installation or servicing or use in violation of instruc...

Page 6: ...www GlobalTestSupply com Find Quality Products Online at sales GlobalTestSupply com ...

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