To Close The Vacuum Manifold - HP 5973 Hardware Manual

2

To close the vacuum manifold

To close the vacuum manifold

Materials needed:
Gloves, clean, lint-free
1 Make sure all the internal analyzer electrical leads are correctly attached.
2 Check the side plate O-ring.
Make sure the O-ring has a very light coat of Apiezon 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. See page 140 for instructions for lubricating the side plate O-ring.
3 Close the side plate.
4 Reconnect the side board control cable and source power cable to the side
board.
5 Make sure the vent valve is closed.
6 Pump down the MSD (page 58).
7 Gently hand tighten the front side plate thumbscrew
This is only necessary for CI MSDs, or if hydrogen or other flammable or toxic sub-
stance is used for carrier gas.
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Do not overtighten the thumbscrew; it can cause air leaks or prevent successful
pumpdown. Do not use a screwdriver to tighten the thumbscrew.
8 Once the MSD has pumped down, reinstall the upper MSD cover.
Wait until after pumpdown to reinstall the upper MSD cover.
56
Operating the MSD
large (8650-0030)
small (8650-0029)