Page 98 SITRANS LU10 – INSTRUCTION MANUAL 7ML19985AN02
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Troubleshooting Guide
Measurement Difficulties
If a measurement difficulty occurs for greater than the Failsafe Timer (P070) setting, "LOE"
is flashed alternately with the Reading display. Under certain conditions, a measurement
difficulty may cause the SITRANS LU10 to "lock on" to a false echo and report a fixed or
wrong Reading.
Flashing "LOE" Display
If "LOE" is displayed, ensure the following:
1. Material (object) surface monitored is within the maximum range of the
transducer.
2. Transducer (P004) value matches the transducer used.
3. Transducer is located and aimed properly.
(See the Transducer manual for the maximum range, mounting and rough aiming
instructions.)
For optimum performance, adjust the transducer aiming while monitoring the Echo
Confidence (P805) for various material levels over the measurement range. When
complete, set the transducer aiming at the best angle for all levels.
To display Echo Confidence in the RUN mode
Press and hold for 4 seconds (Failsafe Time Left changes to the Short:Long
Confidence display).
To display Echo Confidence in the PROGRAM mode, access the Echo Confidence (P805)
parameter. To update the value displayed after each aiming adjustment
Press (5 times or more to verify stability)
If the condition persists (despite optimum aiming), optimize transducer performance.
Adjust Short Shot Frequency, (P842) and Long Shot Frequency, (P843) for maximum Echo
Confidence (P805).
Increase the Failsafe Timer (P070) value, if failsafe operation will not be compromised by
the larger value.
If "LOE" is displayed only when a sloped bottom vessel is near Empty, the echo is probably
being reflected away from the transducer. Install an empty "target plate" in the bottom of
the vessel. When exposed (not covered by material), the target plate provides the
reflective surface representative of an empty vessel.
Install a longer range transducer, enter the new Empty (P006) distance, and (if necessary)
optimize aiming and frequency again.
If a longer range transducer is not available, connect an oscilloscope to the SITRANS
LU10 (see Enhancement Parameters Scope Displays, P810).
If a discernible echo is observed (representative of the material / object surface), reduce
the Confidence Threshold (P804) while taking new measurements (in the RUN or
PROGRAM mode).
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