Agilent Technologies G7035A Operation Manual page 77

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5977 Series MSD Operation Manual
In the Instrument Control view, Instrument menu, select MS Vacuum Control to
display the Vacuum Control dialog.
Remove the analyzer window cover (see
page 75).
Click Vent to begin the automated shutdown of the MSD. Follow the
instructions presented.
When prompted, turn the vent valve knob counterclockwise only 3/4 turns
or until you hear the hissing sound of air flowing into the analyzer
chamber.
Do not turn the knob too far or the O-ring may fall out of its groove. Be
sure to close the vent valve before pumping down.
Operating in Electron Ionization (EI) Mode
"To Open the MSD Covers"
Vent valve knob
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