Fluke Biomedical 943-35 - Manual (Page 16)

Victoreen 942-35,943-36,943-36H, 943-37,943-237A
Operators Manual
4-2
Detector Assembly
If additional information is required, refer to the
assembly drawing in Appendix A.
1. Prior to assembly, inspect the following parts for damage:
All
P/N 46-35 Detector end plate o-ring
P/N 843-133-4 Detector crystal cushion
943-35
P/N 843-35-6 PMT alignment spacer
P/N 46-20 o-ring
943-36 & 943-36H
P/N 38-34 Inner/outer mounting rings
P/N 38-35 Crystal retaining ring
P/N 843-36-51 Crystal alignment mounting ring
P/N 46-73 o-ring
2. Lightly lubricate the 46-35 rear end plate o-ring with o-ring grease (MST-3306 or equivalent) and
install on end plate.
3. For the 943-36, 943-36H, 943-37, and 943-237A detectors install the PMT/crystal assembly into the
socket and insert the PMT/crystal and preamplifier assembly into the sleeve, ensuring the four
screw holes on the sleeve are aligned with the end plate holes.
4. For the 943-35 detector, install the PMT/crystal assembly into the socket assembly. Re-install the
P/N 843-35-6 PMT alignment spacer over the crystal, sliding it up to the PMT housing. Lightly
grease the P/N 46-20 o-ring and install in the groove provided on the crystal housing. This will
ensure proper alignment of the PMT/crystal assembly in the sleeve. Insert the PMT/crystal and
preamplifier assembly into the sleeve, ensuring the four screw holes on the sleeve are aligned with
the end plate holes. Press fit the unit together with moderate hand pressure.
5. Re-install the four screws on the base of the detector.
6. For the 943-36 and 943-36H detectors only the crystal retainers at the front of the detector must be
re-installed. First, re-install the P/N 38-34 inner retaining ring in the groove provided on the detector
sleeve to retain the PMT. Next, lightly grease P/N 46-73 o-ring and install in the groove provided on
the P/N 843-36-51 crystal alignment mounting ring. The P/N 38-35 retaining ring is then installed in
the groove provided on the crystal housing to properly position the crystal in the mounting ring. The
P/N 38-34 outer retaining ring is then installed in the outer sleeve groove to properly position the
complete assembly. The assembly is completed by filling in the entire area between the crystal and
the sleeve with RTV (MST-4341, GE #167, or equivalent) to prevent ambient air leakage path
through the detector.
7. Reconnect the detector cable to the readout device.
8. Detector is now ready for calibration.
NOTE