Possible causes and recommended actions for low pickoff voltageTable 14-13:
Possible cause Recommended actions
Moisture, settling of two-phase or
three-phase fluids
• Increase the inlet or back pressure at the meter.
• If a pump is located upstream from the meter, increase
the distance between the pump and meter.
• Check for moisture inside the measurement chamber or
the reference chamber.
The vibrating element is not vi-
brating
• 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.
14.23.1 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.
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.
14.24
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 shorts
Table 14-14:
Possible cause Recommended action
Faulty cable Replace the cable.
Shorts to the housing created by trapped or damaged wires Contact Micro Motion.
Loose wires or connectors Contact Micro Motion.
Liquid or moisture inside the housing Contact Micro Motion.
Troubleshooting
170 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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