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

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Emerson Process Management 1500 manual 7Sensor pickoff values, 8Excessive drive gain causes and remedies

1500 specifications

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