5 General Maintenance
162 5975/5977 Series MSD Operating Manual
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 sources. (See “To Connect/Disconnect
Wiring from the EI XTR, SS, and Inert Sources” on page 140.)
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.
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 analyzer side plate.
5 Pumpdown the MSD. (See “To Pump Down the MS” on page 106.)
6 Once the MSD has pumped down, close the left analyzer cover and replace
the window cover.
7 Tune the MSD.
Do not force the analyzer door when closing, or you may damage the
quadrupole.
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.
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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