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To Monitor High Vacuum Pressure
Pressure monitoring requires an optional external G4363A Ion gauge and
controller. The readout for this gauge is mounted on top of the instrument.
Materials needed
• Ion gauge and controller (G4363A)
If you are using hydrogen as a carrier gas, do not turn on the Ion gauge and
WA R N I N G
controller if there is any possibility that hydrogen has accumulated in the analyzer
chamber. Read
gas. Pump down for 25 minutes before you turn on the vacuum gauge.
Procedure
1 Start up and pump down the MSD
2 Turn on the gauge controller mounted on top of the analyzer cover.
3 The vacuum readout is displayed on the front of the optional vacuum
The largest influence on operating pressure in EI mode is the carrier gas
(column) flow.
flows. These pressures are approximate and will vary from instrument to
instrument by as much as 30%.
5975T LTM GC/MSD Operation Manual
"Hydrogen Safety"
controller.
Table 15
Operating in Electron Impact (EI) Mode
before operating the MSD with hydrogen carrier
(page
106).
lists typical pressures for various helium carrier gas
3
83
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