Installation manual

Operating in Electron Impact (EI) Mode 3
5975 Series MSD Operation Manual 83
5 Remove the analyzer window cover (page 80)
6 Turn the vent valve knob (Figure 20) 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 retighten the knob before pumping down.
Figure 20 Venting the MSD
Vent valve knob
YES NO

WARNING
Allow the analyzer to cool to near room temperature before touching it.
CAUTION
Always wear clean gloves while handling any parts that go inside the analyzer
chamber.
WARNING
When the MSD is vented, do not put the ChemStation into Instrument Control view.
Doing so will turn on the interface heater.