BERTHOLD TECHNOLOGIES LB 480 - 8.3 Trouble Shooting

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
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Volume 3 8 Error Handling
3
8.3 Trouble Shooting
Problem Cause Solution
No signal System is not working Check power supply
Count rate too low Shielding not open or not open correctly. Check lock and secure it in position OPEN
Alignment of the effective radiation
towards the detector is incorrect
Correct and optimize alignment
Container installations in the beam path Offset irradiation plane
Wall deposits in the container Remove wall deposits or perform new calibration if
wall deposits cannot be removed.
Source has reached the end of its service
life
Replace source
No or incorrect level
reading
Entry of final level end values incorrect Check calibration values and level reading
Level reading fluctu-
ates strongly
Time constant too small Increase time constant in the Parameter menu
(min. 20s)
Wrong calibration Check calibration values
Rapid switchover with too small Sigma
value
Increase Sigma value or disable automatic time
switch
Count rate too low
(see above)
Check age of source and irradiation level; replace
detector
Level reading shows
drifts
Detector stabilization faulty Replace detector
Multiplier faulty Exchange multiplier
Current output at
24mA
Current output faulty or defective. Recalibrate current output. Then restart detector by
Software Reset or by turning the power supply off/
on.
If the current output cannot be calibrated, the
detector needs to be repaired.