HP 5890 SERIES II Service Manual page 144

33. Locate the " U- shaped"slots on the instrument
to the left of the inlet. Bend the tubes from the
new jet to lay within these slots, and any in-
stalled clips, and route them to their associated
attachment points on the left side of the instru-
ment.
When installing tubing in the applicable flow
control component, ensure that all o- rings
are positioned properly.
34. Connect the tubes from the new jet weldment
to the flow manifold block. (The hydrogen tube
fitting is painted RED. Make sure each tube is
installed at the correct location on the flow
manifold block.)
35. If the PCOC fan and cover were removed, in-
stall them and secure using two screws.
36. Inspect the detector weldment in which the jet
weldment will be installed. If any evidence of
damage or excessive contamination are ob-
served, replace the detector weldment with a
new one.
37. Press the jet weldment into the base of the de-
tector weldment.
During assembly of the detector, always use new seals (o- rings, gaskets) and
discard the old ones.
38. Install a new heat shield gasket on the detector weldment.
39. Install a new first heat shield window.
40. Assemble the 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.)
41. 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. Then back off all screws except the top one, to allow
clamping of the weldment to its support bracket.)
42. Install the assembled detector weldment assembly vertically onto the transfer tube weldment,
being careful not to damage the fused silica liner.
43. Install the heater and sensor cartridges into the detector weldment.
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NOTE
SVC 4- 74
SLOTS