Fluke Biomedical 943-27 Detector - Manual (Page 12)

943-27 Beta Scintillation Detector
Operator Manual
3-2
Adapter Flange Installation: Lubricate the P/N 46-104 Quad lobed seat, the larger of the 2 seals, with O-
ring lubricant, Dow Corning #55, or equivalent. Insert the seal into the groove on the P/N 943-27-48
adaptor flange, the larger of the 2 flanges, with 2 sets of mounting holes. Place the adaptor flange over
the mating mounting surface. The quad lobed seal must be located between the adaptor flange and the
mating stationery mounting surface. Secure the adaptor flange to the mounting surface using the
hardware provided with the sampling geometry. Tighten the nuts securely (50 inch-lbs).
Detector Installation: Locate the P/N 943-27-47 detector-mounting flange, the smaller of the 2 flanges,
with 1 set of mounting holes. From the bottom of the detector, the end with the titanium window, slide the
detector flange over the body of the detector, up to the cables at the opposite end of the detector. The
groove cut into the flange must face the bottom of the detector. Lubricate the P/N 46-103 Quad lobed
seat, the smaller of the 2 seals, with O-ring lubricant, Dow Corning #55, or equivalent. Slide the quad
lobed seal over the body of the detector, up to the detector flange. Insert the seal into the groove on the
P/N 943-27-47 detector flange. The quad lobed seal must face the bottom, or sensitive end of the
detector to permit sealing to the adaptor flange.
Install the Model 943-27 detector, with detector flange and quad lobed seal, into the hole in the adaptor
flange and into the detector housing. Insert the detector into the detector housing until the sensitive end
of the detector rests on the support ring on the bottom of the detector tube. Use care to not damage the
thin, beta sensitive end window on the detector.
Detector Flange Installation: Slide the detector mounting flange and quad lobed seal down the body of
the detector until it stops on the detector adaptor flange. Install the 6, 10-32 x 0.62 inch long, stainless
steel, Socket head cap screws and lock washers into the holes provided in the detector flange. Line up
the holes in the detector flange with the threaded holes in the adaptor flange. Screw the cap screws into
the threaded mounting holes in the adaptor flange. Tighten the nuts securely (50 inch-lbs).
This completes the detector installation. The sampling geometry may now be pressure tested. The
maximum pressure for the system is 12 psig.
Detector Removal:
CAUTION
Due to the potential for high activity radioactive gasses in or
around the vicinity of the detector, protective Clothing should
be worn while installing or removing the detector.
WARNING
The sampling geometry is an accident range noble gas monitor,
and radioactive gasses may be present within the sampling
volume. The local plant Health Physicist should be consulted
prior to removing the Detector or opening the Grab sample valve.
Detector removal is the opposite of the typical detector installation described above. If the detector has
not been replaced for over 18 months, the 46-103 Quad lobed seal should be inspected for wear or
damage. If the seal is worn, it should be replaced at this time. When replacing the seal, the new seal
should be lubricated with O-ring lubricant, Dow Corning #55, or equivalent. If the detector adaptor flange
has not been replaced for over 6 years, the 46-104 Quad lobed adaptor flange seal should be inspected
for wear or damage. If the seal is worn, it should be replaced at this time. When replacing the seal, the
new seal should be lubricated with O-ring lubricant, Dow Corning #55, or equivalent