Tip
You can reduce the occurrence of two-phase flow alerts by setting Two-Phase Flow Low Limit to a
lower value, Two-Phase Flow High Limit to a higher value, or Two-Phase Flow Timeout to a higher
value.
Related information
Configure two‐phase flow parameters
10.24 Check the drive gain
Excessive or erratic drive gain may indicate any of a variety of process conditions or sensor
problems.
To know whether your drive gain is excessive or erratic, you must collect drive gain data
during the problem condition and compare it to drive gain data from a period of normal
operation.
Excessive (saturated) drive gain
Possible causes and recommended actions for excessive (saturated)
drive gain
Table 10-7:
Possible cause Recommended actions
Two-phase flow Check for two-phase flow. See Section 10.23.
Sensor tubes not completely
full
Correct process conditions so that the sensor tubes are full.
Plugged sensor tube Check the pickoff voltages (see Section 10.25). 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.
Cavitation or flashing; settling
of two-phase or three-phase
fluids
• 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 or repositioned. Con-
sult the installation manual for your sensor.
Drive board or module failure Contact Micro Motion.
Bent sensor tube Check the pickoff voltages (see Section 10.25). If either of them
are close to zero (but neither is zero), the sensor tubes may be
bent. The sensor will need to be replaced.
Cracked sensor tube Replace the sensor.
Sensor imbalance Contact Micro Motion.
Vibrating element not free to
vibrate
Ensure that the vibrating element is free to vibrate.
Open drive or left pickoff sen-
sor coil
Contact Micro Motion.
Troubleshooting
Configuration and Use Manual 163
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