104 Troubleshooting and Maintenance Manual
6 Vacuum System
Side Plate
The side plate covers the large opening in the side of the manifold. There are
no user serviceable part accessible through the hinged side plate. The analyzer
assembly is attached to the side plate inside the analyzer chamber.
Several electrical feedthroughs are built into the side plate. Wires connect the
feedthroughs to analyzer components.
Thumbscrews are located at each end of the side plate. We recommend that
the thumbscrews be loosely tightened
Vacuum Seals
Several types of Viton elastomer O-ring seals are used to prevent air leaks into
the analyzer chamber. All these O-rings, and the surfaces to which they seal,
must be kept clean and protected from nicks and scratches. A single hair,
piece of lint, or scratch can produce a serious vacuum leak. Three of the
O-rings are lightly lubricated with Apiezon-L vacuum grease: the side plate
O-rings and the vent valve O-ring.
Contact Agilent to have these vacuum seals serviced.
Fasten the side plate thumbscrews for shipping or storage only. For normal operation,
both thumbscrews should be loose. Overtightening will warp the side plate and cause
air leaks. Do not use a tool to tighten the side plate thumbscrews.
When you turn on the power to pump down the MS, be sure to press on the side board
to ensure good seals.
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