Honeywell Pressure Transmitter STD720

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 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

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

Save or record device configuration data.

Remove the Transmitter from service, and move it to a clean area before disassembling it.

Loosen the End Cap Lock, and unscrew the End Cap from the electronics side of the Transmitter housing.

If a display is present, press the two snaps along the side, and remove it from the communication module assembly.

Loosen the two retaining screws, and remove the Communications Module assembly, and remove the Communication Module assembly from the electronics housing.

Disconnect the Sensor Cable from the Communications Board.

Use a 2mm hex wrench to completely loosen the set screw on the outside of the housing to permit rotating the meter body.

Carefully turn the complete meter body counterclockwise to unscrew it from the electronics housing.

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's current state

Select the calibration tool used

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

Enter the Transmitter's output signal measurement range

Did the Transmitter pass the calibration test?

Sign off on the Transmitter calibration