4 Operating in EI Mode
To Vent the MS D
110 5977C GC/MSD Operating Manual
2 In the Instrument Control view, Instrument menu, select MS Vacuum Control
to display the Vacuum Control dialog. (See Figure 36 on page 110.)
3 Remove the analyzer window cover. (See “To Open the MSD Covers” on
page 108.)
4 Click Fast Vent if your system supports DCOMM communication between
the GC and MSD, 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/MSD interface heater and the GC oven
temperatures to ambient (room temperature).
5 Turn off the MSD by pressing the power switch. (See Figure 1 on page 17.)
6 Unplug the MSD power cord.
Figure 36 Vacuum control dialog
When the MSD 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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