Excessive Drive Gain; Erratic Drive Gain - Emerson Micro Motion 1000 Series Configuration And Use Manual

Troubleshooting
Table 12-7 Sensor pickoff values
(1)
Sensor
ELITE Model CMF sensors
Model D, DL, and DT sensors
Model F025, F050, F100 sensors
Model F200 sensors (compact case)
Model F200 sensors (standard case)
Model H025, H050, H100 sensors
Model H200 sensors
Model R025, R050, or R100 sensors
Model R200 sensors
Micro Motion T-Series sensors
CMF400 I.S. sensors
CMF400 sensors with booster amplifiers
(1) If your sensor is not listed, contact Micro Motion. See Section 12.3.
12.25.3

Excessive drive gain

See Table 12-8 for a list of possible causes of excessive drive gain.
Table 12-8 Excessive drive gain causes and remedies
Cause
Excessive slug flow
Plugged flow tube
Cavitation or flashing
Drive board or module failure, cracked flow tube,
or sensor imbalance
Mechanical binding at sensor
Open drive or left pickoff sensor coil
Flow rate out of range
Incorrect sensor characterization
12.25.4

Erratic drive gain

See Table 12-9 for a list of possible causes of erratic drive gain.
Configuration and Use Manual
Pickoff value
3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
0.5 mV peak-to-peak per Hz based on sensor flow tube frequency
2.7 mV peak-to-peak per Hz based on sensor flow tube frequency
3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
Possible remedy
See Section 12.17.
Purge the flow tubes or replace the sensor.
Increase inlet or back pressure at the sensor.
If a pump is located upstream from the sensor, increase the distance
between the pump and sensor.
Contact Micro Motion. See Section 12.3.
Ensure sensor is free to vibrate.
Contact Micro Motion. See Section 12.3.
Ensure that flow rate is within sensor limits.
Verify characterization. See Section 6.2.
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