Operating in Electron Impact (EI) Mode 3
To Pump Down the MS
Operation Manual 67
6 Select the MS Tune icon from the Instrument Control panel.
7 Select the Vacuum Control tab.
8 Click t
he Pumpdown button.
Figure 21 V
acuum Control tab
Within 10 to 15 minutes the turbo pump speed should be up to
80% (Figure 21). The pump speed should eventually reach 95%.
If these conditions are not met, the MS electronics will shut off
the foreline pump. In order to recover from this condition, you
must power cycle the MS. If the MS does not pump down
correctly, see the manual or online help for information on
troubleshooting air leaks and other vacuum problems.
9 Turn on the carrier gas flow after the vacuum pumps have
been running for 15 minutes.
10 When prompted, turn on the GC/MS interface heater and GC
oven. Click OK when you have done so. The software will turn
on the ion source and mass filter (quad) heater. The
temperature setpoints are stored in the current autotune file.
CAUTION
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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