Troubleshooting
139
10.2 Possible calibration errors
Error Remedy
Incorrect measured value Check "actual distance"
a. "Actual distance" is incorrect
– For measurements in bypasses or ultrasound guide pipes:
Select the appropriate option in the "application parameters" parameter set.
– Perform tank map ("distance mapping")
b. "Actual distance" is correct
– Check "empty calibration" and "full calibration"
– Check the linearization
Measured value does not
change when filling or
emptying a vessel
a. Perform tank map (interference echo suppression)
b. clean sensor if necessary
c. choose better mounting position of the sensor (to avoid interference echos)
With an uneven surface the
measured value jumps
sporadically to higher levels
a. Perform tank map (interference echo suppression)
b. Select "turbulent surface" or "additional agitator" in the "process conditions"
parameter
c. Increase "output damping"
d. if possible: choose better mounting position and/or larger sensor
When filling the vessel, the
measured value sporadically
drops to lower levels
a. Change the "tank geometry" to "dome ceiling" or "horizontal cylinder"
("application parameters" parameter set)
b. If possible: avoid central mounting position of the sensor.
c. if possible: install sensor in bypass or ultrasound guide pipe.
Echo loss (Error E@@641) a. Check all settings in the "application parameters" parameter set.
b. if possible: choose better mounting position and/or larger sensor.
c. Align the sensor membrane parallely to the product surface (especially for solid
applications).
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