7 General Maintenance
To Close the Front Analyzer Chamber
7000/7010 Series TQ GC/MS Operating Manual 195
To Close the Front Analyzer Chamber
Procedure
1 Check the side plate O-ring.
Ensure 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 7000/7010 Series MS Troubleshooting and
Maintenance Manual for lubricating instructions.
2 Swing the front analyzer side plate closed.
The post-filter on the exit side of the quad helps to position the CC when the
analyzer door is closed. When closing, the door should give minimal
resistance while the quad is reseating the CC. The analyzer should slide
into place with minimal pressure.
3 Ensure the rear analyzer door is closed.
4 Ensure the vent valve is closed.
5 If hydrogen or an other flammable or toxic substance is used for carrier gas,
gently hand-tighten the top thumbscrew on the front analyzer side plate.
6 Pumpdown the MS. (See “To Pumpdown the MS” on page 120.)
7 Once the MS has pumped down, close the left analyzer cover and replace the
window cover.
8 Tune the MS.
Do not force the analyzer door when closing, or you may damage the CC or
quadrupole.
The top thumbscrew must be fastened if hydrogen (or other hazardous gas) is
being used as the GC carrier gas or if hydrogen is used for the JetClean
system. 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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