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Table 7-6: Incorrect Level Readings
(continued)
Symptom
Possible causes
Recommended actions
Measured value jumps to a lower value.
Level
Time
Multiple products in the tank,
e.g. thin oil layer on top of
water that is sometimes
detected, sometimes not.
Set Double Surface Handling to Track
Upper Surface or Track Lower Surface, see
.
Measured level fluctuates.
Level
Time
Excessive foaming or
turbulence.
•
Under turbulent conditions with low
level rates, consider increasing the
Damping value, see
•
Enable the Foam parameter or
Turbulent Surface parameter, or both.
See
.
Measured level is occasionally unstable.
Level
Time
May be caused by an empty
tank with the amplitude
threshold set too low.
Analyze the echo curve and check
amplitude thresholds, see
.
The product surface is close
to a suppressed false echo.
If possible, remove the disturbing object.
Measured level lags during rapid level
changes.
Level
Time
Damping value too high.
If there is a problem with lag during rapid
level changes, consider decreasing the
Damping value, see
.
Maximum Level Rate value
too low.
Verify Maximum Level Rate configuration.
Service and troubleshooting
Reference Manual
February 2020
00809-0100-4408
110
Reference Manual
Содержание Rosemount 5408
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