Models 947, 948 and 960 Leak Detectors Operations and Service Manual
4-19
8. When installing the ground slit plate
➃
, be sure that the snap prongs are facing up, then
align the slit at 90° with the side wall of the spectrometer tube, and concentrically align
the circular hole in the plate with the smaller guide hole in the bottom of the ion source
cavity (Figure 4-5, View A).
9. Wipe the new O-ring
➀
and mating surfaces with a clean, lint-free cloth and place the
new ion source
➁
in its cavity (Figure 4-6 on page 4-20) as follows:
❑
Place the locating pin
➂
approximately in the center of the guide hole.
❑
Ensure that pins 1 and 8
➃
are parallel to the side wall of the spectrometer tube as
shown in Figure 4-6 on page 4-20, View A.
❑
Tighten the flange cap
➄
evenly and firmly with the four Phillips head screws.
CAUTION
A short could result at power up if the alignment pin
touches the sides of the alignment hole.
10. Fit the magnet assembly
➅
back onto the spectrometer tube body.
11. With the grounding strap
➆
attached to the same screw from which it was removed,
replace and tighten the four screws that fit into the magnet assembly.
12. Insert the pole pieces
➇
and the black plastic knobs
➈
making sure that the pole pieces
are snug against the body, and tighten the 5-64 Allen set screws.
13. Leak check the assembly before reinstalling the spectrometer tube into the leak detector.
Содержание 947
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