Trim Ma Outputs Using The Field Communicator; Check Hart Communications - Emerson MICRO MOTION HFVM Series Configuration And Use Manual

Troubleshooting
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3.
10.13.2

Trim mA outputs using the Field Communicator

Trimming the mA output establishes a common measurement range between the
transmitter and the device that receives the mA output.
Important
You must trim the output at both ends (4 mA and 20 mA) to ensure that it is compensated
accurately across the entire output range.
Prerequisites
Ensure that the mA output is wired to the receiving device that will be used in production.
Procedure
1.
2.
3.
10.14

Check HART communications

If you cannot establish or maintain HART communications, or if the primary mA output is
producing a fixed value, you may have a wiring problem or a HART configuration problem.
Prerequisites
You may need one or more of the following:
•
142
Follow the instructions in the guided method.
Important
If you are using a HART/Bell 202 connection, the HART signal over the primary mA output
affects the mA reading. Disconnect the wiring between ProLink III and the transmitter
terminals when reading the primary mA output at the receiving device. Reconnect to
continue the trim.
Check the trim results. If any trim result is less than −200 microamps or greater than
+200 microamps, contact Micro Motion customer service.
Choose Service Tools > Maintenance > Routine Maintenance > Trim mA Output 1 or Service
Tools > Maintenance > Routine Maintenance > Trim mA Output 2.
Follow the instructions in the guided method.
Important
The HART signal over the primary mA output affects the mA reading. Disconnect the wiring
between the Field Communicator and the transmitter terminals when reading the primary
mA output at the receiving device. Reconnect to continue the trim.
Check the trim results. If any trim result is less than −200 microamps or greater than
+200 microamps, contact Micro Motion customer service.
The installation manual for your meter
Micro Motion ® Heavy Fuel Viscosity Meters (HFVM) Viscomaster ™