CAUTION!
Do not operate the SGM with air in the system. Air in the system, combined with
corrosion, can create a source of ignition.
14.22 Check the drive gain
Use the following table to check drive gain values. If you see a value that is too high or too
low, there could be a problem with the process or with the device. Consider other
diagnostics along with drive gain values to determine whether or not you have a problem.
Abnormal drive gain, possible causes, and recommended actionsTable 14-10:
Drive gain value Possible causes Recommended actions
0% • The transmitter is not connected
to the sensor.
• The connection between the
transmitter and the sensor is dam-
aged.
• For integral installations, inspect
the connection between the
transmitter and the sensor and
check for visible problems.
• Contact Micro Motion customer
service.
Around 5% Normal operation No action required.
Up to 100% See Section 14.22.1
14.22.1 Excessive or erratic drive gain
Excessive or erratic drive gain may indicate any of a variety of process conditions or sensor
problems.
To know whether your drive gain is excessive or erratic, you must collect drive gain data
during the problem condition and compare it to drive gain data from a period of normal
operation.
Excessive (saturated) drive gain
Possible causes and recommended actions for excessive (saturated)
drive gain
Table 14-11:
Possible cause Recommended actions
Deposition on the vibrating ele-
ment or inner walls of the de-
vice
Check for deposition and clean the device if necessary.
Moisture, settling of two-phase
or three-phase fluids
• Increase the inlet or back pressure at the meter.
• If a pump is located upstream from the meter, increase the
distance between the pump and meter.
• Check for moisture inside the measurement chamber or the
reference chamber.
Troubleshooting
168 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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