Collect Pickoff Voltage Data; Check For Electrical Shorts; Check The Sensor Coils - Emerson Micro Motion 1700 Configuration And Use Manual

10.27.1

Collect pickoff voltage data

Pickoff voltage data can be used to diagnose a variety of process and equipment
conditions. Collect pickoff voltage data from a period of normal operation, and use this
data as a baseline for troubleshooting.
Procedure
1.
2.
10.28

Check for electrical shorts

Shorts between sensor terminals or between the sensor terminals and the sensor case can
cause the sensor to stop working.
Table 10-11:
Possible cause
Moisture inside the junction box
Liquid or moisture inside the sensor
case
Internally shorted feedthrough
Faulty cable
Improper wire termination
10.28.1

Check the sensor coils

Checking the sensor coils can identify electrical shorts.
Restriction
This procedure applies only to 9-wire remote-mount transmitters and remote transmitters with
remote core processors..
Procedure
1.
Configuration and Use Manual
Navigate to the pickoff voltage data.
Observe and record data for both the left pickoff and the right pickoff, over an
appropriate period of time, under a variety of process conditions.
Possible causes and recommended actions for electrical shorts
Disconnect power to the transmitter.
CAUTION!
If the transmitter is in a hazardous area, wait 5 minutes before continuing.
Recommended action
Ensure that the junction box is dry and no corrosion is
present.
Contact Micro Motion.
Contact Micro Motion.
Replace the cable.
Verify wire terminations inside sensor junction box. The
Micro Motion document titled 9-Wire Flowmeter Cable Prepa-
ration and Installation Guide may offer some assistance.
Troubleshooting
201