Emerson MICRO MOTION 1500, Configuration And Use Manual, Page: 161 / 282

Configuration and Use Manual 151
Troubleshooting
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Custod
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Compensa
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12.25.3 Excessive drive gain
See Table 12-8 for a list of possible causes of excessive drive gain.
12.25.4 Erratic drive gain
See Table 12-9 for a list of possible causes of erratic drive gain.
Table 12-7 Sensor pickoff values
Sensor
(1)
(1) If your sensor is not listed, contact Micro Motion. See Section 12.3 .
Pickoff value
ELITE Model CMF sensors 3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
Model D, DL, and DT sensors 3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
Model F025, F050, F100 sensors 3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
Model F200 sensors (compact case) 2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
Model F200 sensors (standard case) 3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
Model H025, H050, H100 sensors 3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
Model H200 sensors 2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
Model R025, R050, or R100 sensors 3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
Model R200 sensors 2.0 mV peak-to-peak per Hz based on sensor flow tube frequency
Micro Motion T-Series sensors 0.5 mV peak-to-peak per Hz based on sensor flow tube frequency
CMF400 I.S. sensors 2.7 mV peak-to-peak per Hz based on sensor flow tube frequency
CMF400 sensors with booster amplifiers 3.4 mV peak-to-peak per Hz based on sensor flow tube frequency
Table 12-8 Excessive drive gain causes and remedies
Cause Possible remedy
Excessive slug flow See Section 12.17.
Plugged flow tube Purge the flow tubes or replace the sensor.
Cavitation or flashing 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.
Drive board or module failure, cracked flow tube,
or sensor imbalance Contact Micro Motion. See Section 12.3.
Mechanical binding at sensor Ensure sensor is free to vibrate.
Open drive or left pickoff sensor coil Contact Micro Motion. See Section 12.3.
Flow rate out of range Ensure that flow rate is within sensor limits.
Incorrect sensor characterization Verify characterization. See Section 6.2.