Emerson Process Management 1500 7 Sensor pickoff values, 11.23.3Excessive drive gain, Sensor1

Troubleshooting

Table 11-7Sensor pickoff values

Sensor(1)	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

(1) If your sensor is not listed, contact Micro Motion. See Section 1.8

11.23.3Excessive drive gain

Excessive drive gain can be caused by several problems. See Table 11-8.

Table 11-8Excessive 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,	Contact Micro Motion. See Section 1.8.
or sensor imbalance
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.

106 Micro Motion® Model 1500 Transmitters with the Filling and Dosing Application