38477BA2B
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4 Repair, Maintenance and Service Volume 2
4.4 Trouble Shooting
Problem Probable cause Potential solution
No signal System out of work Check power supply check
fuses; is LED 1 on the digital
board flashing?
Count rate too
low
Shielding not or not cor-
rectly opened
Check lock and secure it in
position OPEN
Alignment of useful
beam toward detector
not correct
Correct and optimize align-
ment
Vessel installations in the
radiation channel
Offset irradiation levels
Wall deposit in vessels Remove wall deposits or
perform new calibration if
wall deposits cannot be
removed
Source has reached the
end of its service life
Renew source (Co-60 after 5
to 10 years, at the earliest)
No or incorrect
level reading
Entry of final level end
values incorrect
Check calibration values and
level reading
Level reading
fluctuates
strongly
Time constant too small Increase time constant in
the parameter menu (min
20s)
Wrong calibration Check calibration values
Rapid switch-over with
too small Sigma value
Disable rapid switch-over
Count rate too low (see
above)
Check age of source and
irradiation level. Replace
detector
Level reading
shows drifts
Detector stabilization
faulty
Replace detector
Photomultiplier faulty Replace multiplier
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