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Overview
Drive gain data can be used to diagnose a variety of process and equipment conditions.
Collect drive gain data from a period of normal operation, and use this data as a baseline
for troubleshooting.
Procedure
1. Navigate to the drive gain data.
2. Observe and record drive gain data over an appropriate period of time, under a
variety of process conditions.
10.27 Check the pickoff voltage
If the pickoff voltage readings are unusually low, you may have any of a variety of process
or equipment problems.
To know whether your pickoff voltage is unusually low, you must collect pickoff voltage
data during the problem condition and compare it to pickoff voltage data from a period of
normal operation.
Possible causes and recommended actions for low pickoff voltageTable 10-10:
Possible cause Recommended actions
Air entrainment • Increase the inlet or back pressure at the sensor.
• If a pump is located upstream from the sensor, increase the
distance between the pump and sensor.
• The sensor may need to be reoriented. Consult the installation
manual for your sensor for recommended orientations.
Faulty wiring runs between
the sensor and transmitter
Verify wiring between sensor and transmitter.
Process flow rate beyond the
limits of the sensor
Verify that the process flow rate is not out of range of the sensor.
Slug flow Check for slug flow. See Section 10.25.
No tube vibration in sensor • Check for plugging.
• Ensure sensor is free to vibrate (no mechanical binding).
• Verify wiring.
• Test coils at sensor. See Section 10.28.1.
Moisture in the sensor elec-
tronics
Eliminate the moisture in the sensor electronics.
The sensor is damaged, or
sensor magnets may have be-
come demagnetized
Replace the sensor.
Troubleshooting
Configuration and Use Manual 187