Table 17-2: Possible causes and recommended actions for excessive (saturated) drive gain
(continued)
Possible cause
Recommended actions
Over-pressurized tubes
Contact customer support.
Plugged sensor tube
Check the pickoff voltages (see
). If either of them are close to
zero (but neither is zero), plugged tubes may be the source of your problem. Purge the
tubes. In extreme cases, you may need to replace the sensor.
Sensor case full of process
fluid
Replace the sensor.
Sensor imbalance
Contact customer support.
Sensor tubes not
completely full
Correct process conditions so that the sensor tubes are full.
Two-phase flow
Check for two-phase flow (slug flow)
.
Vibrating element not free
to vibrate
Ensure that the vibrating element is free to vibrate.
Erratic drive gain
Table 17-3: Possible causes and recommended actions for erratic drive gain
Possible cause
Recommended actions
Foreign material caught in sensor
tubes
•
Purge the sensor tubes.
•
Replace the sensor.
17.19 Check for internal electrical problems
Shorts between sensor terminals or between the sensor terminals and the sensor case can cause the sensor to
stop working.
Possible cause
Recommended action
Liquid or moisture inside the sensor case
Contact customer support.
Internally shorted feedthrough
Contact customer support.
Faulty cable
Replace the cable.
17.20 Check Frequency Output Fault Action
The
Frequency Output Fault Action
controls the behavior of the Frequency Output if the transmitter
encounters an internal fault condition. If the Frequency Output is reporting a constant value, the transmitter
may be in a fault condition.
Procedure
1. Check the status alerts for active fault conditions.
2. If there are active fault conditions, the transmitter is performing correctly. If you want to change its
behavior, consider the following options:
•
Change the setting of
Frequency Output Fault Action
.
Configuration and Use Manual
Troubleshooting
MMI-20025166
March 2019
Configuration and Use Manual
287