Collect Pickoff Voltage Data; Check For Internal Electrical Problems - Emerson Micro Motion SGM Series Configuration And Use Manual

Troubleshooting
Table 14-13:
Possible cause
Moisture, settling of two-phase or
three-phase fluids
The vibrating element is not vi-
brating
Moisture in the sensor electronics
The sensor is damaged, or sensor
magnets may have become de-
magnetized
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.
2.
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.
Table 14-14:
Possible cause
Faulty cable
Shorts to the housing created by trapped or damaged wires
Loose wires or connectors
Liquid or moisture inside the housing
170
Possible causes and recommended actions for low pickoff voltage
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
Recommended actions
• 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.
• Check for plugging or deposition.
• Ensure that the vibrating element is free to vibrate (no
mechanical binding).
Eliminate the moisture in the sensor electronics.
Replace the sensor.
®
Micro Motion
Recommended action
Replace the cable.
Contact Micro Motion.
Contact Micro Motion.
Contact Micro Motion.
Gas Specific Gravity Meters (SGM)