HP 5890 SERIES II Service Manual page 138

Due to the composition of the first heat shield gasket, it may be difficult to remove the
first heat shield window from the detector weldment. If difficulties are encountered, it
may be necessary to use a sharp implement to pry the first heat shield window out of
the detector weldment. This may cause chipping or breakage of the window, in which
case it must be replaced. Also, if chipping or breakage occurs, use an inert gas to
blow any fragments out of the detector weldment, and clean the weldment with an
approved solvent.
16. If the heat shield windows are not going to be replaced, wipe them clean using a lint- free lens
tissue. Be careful not to scratch the surface of the windows. (If necessary clean the windows
with a solution of soft soap and warm water. Rinse with distilled water.)
During assembly of the detector, always use new seals (o- rings, gaskets) and
discard the old ones.
17. Assemble the heat shield gasket (new), first heat shield window, heat shield disk, stainless steel
coupling and clamp to the detector weldment and secure using four screws and four lock
washers. (Tighten screws evenly to ensure a gas- and light- tight seal.)
18. Assemble the second heat shield window, associated o- rings (new), flange adapter, and
flange ring to the stainless steel coupling and secure using four screws. (Tighten screws evenly
to ensure a gas- and light- tight seal.)
19. Install the o- ring for the sulphur filter in the flange adapter.
20. Install the sulphur filter in the flange adapter.
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WELDMENT
HEAT SHIELD GASKET (19256- 80040)
FIRST HEAT SHIELD WINDOW
HEAT SHIELD DISK
STAINLESS STEEL
COUPLING
SCREW
LOCK WASHER
CLAMP
NOTE
NOTE
SVC 4- 68
O- RING (0905- 1104)
SECOND HEAT
SHIELD WINDOW
O- RING (0905- 0955)
FLANGE ADAPTOR
FLANGE RING
SCREW
O- RING (0905- 1103)