Vacuum System 6
5977B Series MSD Troubleshooting and Maintenance Manual 163
Side Plate
The side plate for the HES version (See Figure 30 on page 164) or the non-HES
version (See Figure 31 on page 165) covers the large opening in the side of the
analyzer chamber. It is attached to the manifold with a hinge. The analyzer
assembly is attached to the side plate inside the analyzer chamber. The hinge
allows the side plate to swing away from the manifold for easy access to the
analyzer.
Several electrical feedthroughs are built into the side plate. Wires connect the
feedthroughs to analyzer components. The electronic side board is mounted on
the atmospheric side of the side plate.
Thumbscrews are located at each end of the side plate.
Fasten both side plate thumbscrews for shipping or storage only. For normal operation,
both thumbscrews should be loose. For operation with hydrogen carrier gas, or with
flammable or explosive CI reagent gases, the front thumbscrew should be fastened just
finger-tight. 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 MSD, press on the side board to ensure
a good seal.
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