134 Operation Manual
9 GC-MS Features
To Set Up a Vent Method
A good MS Vent method does the following:
• Turns off the MS transfer line heater.
• Turns off the inlet heater.
• Sets the oven to a low temperature, < 50 °C.
• Sets the column flow rate into the MS to as high a flow
as you feel is appropriate and safe. For turbo pumps, set
the flow to 15 mL/min or to the maximum flow rate
possible for the column configuration (note that rates
above 15 mL/min may not provide additional benefits).
For diffusion pumps, typically set the flow to 2 mL/min
(never exceed 4 mL/min).
You must create this method to use the fast venting feature.
To create and store the method:
1 Create the method by making the settings on the GC.
2 When the settings are entered, press [Method].
3 Scroll to MS Vent, then press [Store]. If prompted to
overwrite an existing MS Vent method, press [On/Yes] to
confirm.
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