106 Micro Motion
®
Model 1500 Transmitters with the Filling and Dosing Application
Troubleshooting
11.23.3 Excessive drive gain
Excessive drive gain can be caused by several problems. See Table 11-8.
Table 11-7 Sensor pickoff values
Sensor
(1)
(1) If your sensor is not listed, contact Micro Motion. See Section 1.8
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 11-8 Excessive drive gain causes and remedies
Cause Possible remedy
Excessive slug flow See Section 11.17.
Plugged flow tube Purge the flow tubes.
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 1.8.
Mechanical binding at sensor Ensure sensor is free to vibrate.
Open drive or left pickoff sensor coil Contact Micro Motion. See Section 1.8.
Flow rate out of range Ensure that flow rate is within sensor limits.
Incorrect sensor characterization Verify characterization. See Section 4.2.
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