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Procedure
Verify the configuration of all cutoffs.
Related information
Configure Density Cutoff
10.22 Check for two-phase flow (slug flow)
Two-phase flow can cause rapid changes in the drive gain. This can cause a variety of
measurement issues.
1. Check for two-phase flow alerts (e.g., A105).
If the transmitter is not generating two-phase flow alerts, two-phase flow is not the
source of your problem.
2. Check the process for cavitation, flashing, or leaks.
3. Monitor the density of your process fluid output under normal process conditions.
4. Check the settings of Two-Phase Flow Low Limit, Two-Phase Flow High Limit, and Two-Phase
Flow Timeout.
Tip
You can reduce the occurrence of two-phase flow alerts by setting Two-Phase Flow Low Limit to a
lower value, Two-Phase Flow High Limit to a higher value, or Two-Phase Flow Timeout to a higher
value.
Related information
Configure two‐phase flow parameters
10.23 Check the 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 10-7:
Possible cause Recommended actions
Two-phase flow Check for two-phase flow. See Section 10.22.
Troubleshooting
184 Micro Motion
®
Fork Viscosity Meters (FVM)