Honeywell Pressure Transmitter STA725

All valves closed to isolate the Transmitter from the process

Vent in the process head opened to drain fluid from the Transmitter meter body

Transmitter removed from the process

Nuts removed from the bolts that hold the process head(s) to the meter body

Process heads and bolts removed

Gasket/ O-ring removed and interior of the process head cleaned using a soft bristle brush and an approved solvent

Barrier diaphragm inspected for signs of deterioration, corrosion, and distortion

Warning: Only trained personnel should perform this procedure.

Is the Transmitter operating in analog mode?

If not, refer to the ST 700 Series HART/DE Option User’s Manual, Document # 34-25-25-47.

Upload a photo of the Transmitter

Select the calibration tool used

If Honeywell Smart Field Communicator is used, refer to the Smart Field Communicator Operating Guide, Document # 34-ST-11-14.

Enter the output signal measurement range

Did the Transmitter pass the calibration test?

Sign off on the Transmitter calibration

Warning: This maintenance check requires trained personnel with PPE!

Clear piping of sediment or other foreign matter

Clean the Transmitter process heads, including the barrier diaphragms

Sign off on the Transmitter preventive maintenance

Loosen the end cap lock, and unscrew the end cap from the electronics side of the Transmitter housing

If equipped with a Display module, carefully depress the two tabs on the sides of the Display Module, and pull it off

If necessary, unplug the interface connector from the Communication module. Do not discard the connector

Loosen the two retaining screws, and carefully pull the Communication module from the Electronics compartment

Carefully align and connect the Sensor Ribbon Cable to the connector “J4” at the bottom of the Communication module

Carefully, insert the Communication module into the Electronics compartment. Ensure that the Sensor Ribbon Cable is not pinched

Tighten the two Communication module retaining screws

Refer to the SmartLine User's Manual to change the FAILSAFE, READ/WRITE, and SIM- OFF/SIM-ON (Fieldbus Only) configuration settings

Warning: This procedure requires trained personnel with PPE!

Device configuration data saved or recorded?

Transmitter removed from service and moved to a clean area?

End Cap Lock loosened and End Cap unscrewed from the electronics side of the Transmitter housing?

Warning: Avoid ESD damage when handling the Communication and Display Module assemblies

Display removed from the communication module assembly?

Two retaining screws loosened and Communications Module assembly removed from the electronics housing?

Sensor Cable disconnected from the Communications Board?