Uni-Probe LB 490
BERTHOLD TECHNOLOGIES GmbH & Co. KG
2 – 227
Volume 2 4 Repair, Maintenance and Service
2
4.8 Replacing the Multiplier (for Rod Detec-
tor)
Explosion hazard!
Spare parts for detectors used in hazardous areas may only be
installed by BERTHOLD TECHNOLOGIES service personnel or by
persons authorized by BERTHOLD TECHNOLOGIES. If this is not
possible, the complete detector has to be replaced or returned to
the manufacturer for repair.
When replacing the multiplier it may happen that the sensitivity of
the detector to Gamma radiation changes. Therefore, check the
level indication with empty and full vessel after replacement and, if
necessary, carry out a new calibration. The HV default value must
be determined new.
Dismantle the electronics module as described on page 2–222.
If the multiplier in a rod detector has been exchanged, proceed as
follows to re-assemble it:
Apply a drop of pure silicon oil (Berthold ID no. 18844) to the
center of the multiplier to establish optical connection between
scintillator fixture and multiplier.
Figure 4-4 Electronics with multiplier for rod detectors
Install the electronics module in the Uni-Probe as described on
page 2–223.
Replacement of the multiplier requires a new setting of detector
code and HV parameters. Please see Volume 2, "1.6 Detector
Codes", page 2–133, and Volume 3, "2.38 HV SETTINGS", page 3–
334.
Multiplier
Apply silicon oil in center
of the multiplier
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