5 Operating in EI Mode
To Vent the MSD
136 5977B Series MSD Operating Manual
To Vent 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 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/MSD interface and MSD.
1 If you do not have LVDS or DCOMM communication between the GC and
MSD, 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.
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
MSD power. If the foreline pump is off, hydrogen will accumulate in the MSD
and an explosion may occur. Read “Hydrogen Safety” on page 24 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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