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To Close the Analyzer Chamber
Procedure
1
Do not force the analyzer door when closing, or you may damage the collision cell or
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quadrupole.
2
3
4
5
The top thumbscrew must be fastened if hydrogen (or other hazardous gas) is being
WARNING
used as the GC carrier gas. In the unlikely event of an explosion, it may prevent the
side plate from opening.
Do not overtighten the thumbscrew; it can cause air leaks or prevent successful
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pumpdown. Do not use a screwdriver to tighten the thumbscrew.
5975/5977 Series MSD Operation Manual
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
Troubleshooting and Maintenance Manual
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.
Ensure the vent valve is closed.
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.
Pump down the MS. (See
for lubricating instructions.)
"To Pump Down the MS"
General Maintenance
5977 Series MS
on page 79.)
4
125
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