Possible causes and recommended actions for low pickoff voltage
(continued)
Table 10-9:
Possible cause Recommended actions
Process flow rate beyond the limits
of the sensor
Verify that the process flow rate is not out of range of the
sensor.
Two-phase flow Check for two-phase flow. See Section 10.23.
The vibrating element is not vibrat-
ing
• Check for plugging or deposition.
• Ensure that the vibrating element is free to vibrate (no
mechanical binding).
Moisture in the sensor electronics Eliminate the moisture in the sensor electronics.
The sensor is damaged, or sensor
magnets may have become de-
magnetized
Replace the sensor.
10.25.1 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. Navigate to the pickoff voltage data.
2. 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.
10.26 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 causes and recommended actions for electrical shortsTable 10-10:
Possible cause Recommended action
Liquid or moisture inside the sensor case Contact Micro Motion.
Internally shorted feedthrough Contact Micro Motion.
Faulty cable Replace the cable.
Troubleshooting
Configuration and Use Manual 165
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