General Maintenance 4
5975/5977 Series MSD Operation Manual 125
To Close the Analyzer Chamber
Procedure
1 Ensure all the internal analyzer electrical leads are correctly attached.
Wiring is not the same for both the EI and CI ion sources. The wiring is
described in “To Attach Wiring from the Ion Source to the feedthrough
board” on page 119.
Check the side plate O-ring.
Make sure the O-ring has a very light coat of Apiezon L high vacuum
grease. If the O-ring is very dry, it may not seal well. If the O-ring looks
shiny, it has too much grease on it. (Refer to the 5977 Series MS
Troubleshooting and Maintenance Manual for lubricating instructions.)
2 Swing the analyzer side plate closed.
The post-filter on the exit side of the quad helps to position the collision
cell when the analyzer door is closed. When closing, the door should give
minimal resistance while the quad is reseating the collision cell. The
analyzer should slide into place with minimal pressure.
3 Ensure the vent valve is closed.
4 If hydrogen or other flammable or toxic substance is used for carrier gas,
gently hand-tighten the top thumbscrew on the front analyzer side plate.
5 Pump down the MS. (See “To Pump Down the MS” on page 79.)
CAUTION
Do not force the analyzer door when closing, or you may damage the collision cell or
quadrupole.
WARNING
The top thumbscrew must be fastened if hydrogen (or other hazardous gas) is being
used as the GC carrier gas. In the unlikely event of an explosion, it may prevent the
side plate from opening.
CAUTION
Do not overtighten the thumbscrew; it can cause air leaks or prevent successful
pumpdown. Do not use a screwdriver to tighten the thumbscrew.
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