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Configuration and Use Manual 105
Troubleshooting
Troubleshooting DisplayDiagramsOperation
6.12.3 Excessive drive gain
The causes and possible solutions of excessive drive gain are listed in Table 6-7.
6.12.4 Erratic drive gain
The causes and possible solutions of erratic drive gain are listed in Table 6-8.
Model F200 sensors 2.0 mV peak to peak per Hz based on flow tube frequency
Model H025, H050, and H100 sensors 3.4 mV peak to peak per Hz based on flow tube frequency
Model H200 sensors 2.0 mV peak to peak per Hz based on flow tube frequency
Model R025, R050, or R100 sensor 3.4 mV peak to peak per Hz based on flow tube frequency
Model R200 sensor 2.0 mV peak to peak per Hz based on flow tube frequency
Micro Motion T-Series sensors 0.5 mV peak to peak per Hz based on flow tube frequency
(1) If your sensor model is not listed, contact Micro Motion Customer Support.
Table 6-7 Excessive drive gain causes and solutions
Cause Solution
Excessive slug flow Eliminate slugs.
Change the sensor orientation.
Plugged flow tube Purge the flow tubes. Sensor may need to be replaced.
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 Customer Service.
Mechanical binding at sensor Ensure sensor is free to vibrate.
Open drive or left pickoff sensor coil Contact Micro Motion Customer Service.
Flow rate out of range Ensure flow rate is within sensor limits.
Incorrect sensor characterization Verify characterization. See Section 3.3.
Table 6-8 Erratic drive gain causes and solutions
Cause Solution
Wrong K1 characterization constant for sensor Re-enter the K1 characterization constant. See
Section 3.3.
Polarity of pick-off reversed or polarity of
drive reversed
Contact Micro Motion Customer Service.
Slug flow Verify flow tubes are completely filled with process
fluid, and that slug flow limits and duration are properly
configured. See Section 4.12.
Foreign material caught in flow tubes Purge flow tubes. Sensor may need to be replaced.
Table 6-6 Sensor pickoff values (continued)
Sensor model
(1)
Pickoff value