54733-10BA2L
2 – 234 02.2017
4 Repair, Maintenance and Upkeep Volume 2
4.4 Replacing the Crystal-Multiplier Assem-
bly (for CrystalSENS)
Explosion hazard!
For detectors used in the Ex-area, the crystal-multiplier assembly
must be replaced solely by the BERTHOLD TECHNOLOGIES service
or by persons authorized by BERTHOLD TECHNOLOGIES. If this is
not possible, you must replace the entire detector or return it to the
manufacturer for repair.
Replacing the crystal-multiplier assembly can cause a change in
sensitivity of the detector for gamma radiation. Therefore, check
the calibration after the replacement and possibly perform a new
calibration.
You may carry out the activities described below only if the detector
is not used in an Ex-area.
Remove the electronics module as described on page 2-231.
Dismantle the crystal: loosen and remove the sleeve nut on top
of the overtube of the multiplier tube (PMT). Then pull the crys-
tal off the multiplier.
Remove the PMT overtube from the PCB holder.
Pull the multiplier from the base of the electronics.
Plug the new multiplier into the socket. Please observe the
encoding nose.
Install the electronics module into the detector as described on
page 2-233.
The replacement of the multiplier requires a readjustment of detec-
tor code and HV parameters. Please read also Volume 2, chapter
1.6, "Detector Codes", page 2-166, and Volume 3, chapter 2.42,
"Plateau Measurement", page 3-371.
Check the function of the measurement. If you detect any devi-
ations, carry out a new calibration, see Volume 3, chapter 5, on
page 3-393.
Separate User’s Manuals are available for user interfaces such
as SIMATIC PDM or FOUNDATION
™
Fieldbus.
This completes the exchange of the crystal-multiplier
assembly.
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