4Operating in EI Mode
114 5977B Series MSD Operating Manual
3 Remove the analyzer window cover. (See “To Open the MSD Covers” on
page 112.)
4 Click Fast Vent if your system supports DCOMM communication between the
GC and MS, or click Vent if it does not. If your system supports DCOMM,
MassHunter will load the Fast Vent method to turn off the GC oven and
interface heaters, the source and quad heaters, and the turbo pump.
If your system does not support DCOMM, or if DCOMM has been disabled,
when prompted set the GC/MS interface heater and the GC oven
temperatures to ambient (room temperature).
5 Turn off the MS by pressing the power switch. (See Figure 1 on page 19.)
6 Unplug the MS power cord.
Figure 37 Vacuum control dialog
When the MS is vented, do not put the Agilent MassHunter GC/MS Acquisition
software into Instrument Control view. Doing so will turn on the interface heater.
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