4 Operating in EI Mode
To Pumpdown the MSD
114 5977C GC/MSD Operating Manual
10 In the Instrument Control view, from the Instrument menu, select MS
Vacuum Control to display the Vacuum Control dialog. (See Figure 39.)
11 Click Pump Down in the Vacuum Control dialog, and follow the system
prompts.
12 When prompted, turn on the GC/MSD interface heater and GC oven. Click OK
when you have done so.
The software will turn on the ion source and mass filter (quad) heaters. The
temperature setpoints are stored in the current autotune (*.u) file.
13 After the message Okay to run appears, wait 2 hours for the MSD to reach
thermal equilibrium. Data acquired before the MSD has reached thermal
equilibrium may not be reproducible.
14 If using the JetClean system, prepare the hydrogen system for use. Refer to
the JetClean system Operating manual for warnings regarding hydrogen
safety.
Figure 39 Vacuum Control dialog
Do not turn on any GC heated zones until carrier gas flow is on. Heating a
column with no carrier gas flow will damage the column.
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