Operating in EI Mode 4
5977B Series MSD Operating Manual 113
To Ve n t the MSD
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 7890B GC is established. You must
predefine a Fast Vent method to use this option. See the Agilent MassHunter
GC/MS Acquisition software Online Help for information on how to configure
a Fast Vent method.
Procedure
Agilent recommends that you create and save a Vent method, to ensure that
safe temperatures are applied to the GC/MS transfer line and MS.
1 If you do not have LVDS or DCOMM communication between the GC and
MS, in Instrument Control view select GC Parameters from the Instrument menu
to display the GC Edit Parameters dialog. Select Oven, and set the oven
temperature to room temperature. Also select Aux Heaters (MSD Transfer line)
and Inlets, and set those temperatures to room temperature. Click OK to
close the dialog and send this temperature to the GC.
2 In the Instrument Control view, Instrument menu, select MS Vacuum Control to
display the Vacuum Control dialog. (See Figure 37 on page 114.)
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 23 before operating the MSD
with hydrogen gas.
Ensure the GC oven and the GC/MSD interface are cool before turning off carrier gas
flow to prevent damage to the column.
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