5 Operating in EI Mode
To Vent the MS
124 7000/7010 Series TQ GC/MS Operating Manual
To Vent the MS
Agilent MassHunter GC/MS Acquisition software allows you to specify
parameters in a GC method that will automate and speed up the vent process if
direct communication (DCOMM) with the GC is established. You must predefine
a Fast Vent method to use this option. Refer to the MassHunter GC/MS
Acquisition software Online Help for information on how to configure a Fast Vent
method.
Procedure
1 Click the MS Tune icon from the Instrument Control panel.
2 Select the Manual Tune tab.
3 Select the Vacuum Control tab.
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 you must 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 18.)
6 Unplug the MS power cord.
If hydrogen is used as a carrier gas or JetClean system supply, the carrier and
JetClean system supply shutoff valves must be closed before turning off the
MS power. If the foreline pump is off, hydrogen will accumulate in the MS and
an explosion may occur. Read “Hydrogen Safety” on page 21 before operating
the MS with hydrogen gas.
Ensure the GC oven and the GC/MS interface are cool before turning off carrier
gas flow.
When the MS is vented, do not put the MassHunter software into Instrument
Control view. Doing so will turn on the interface heater.
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