6 Operating in CI Mode
To Pumpdown and Switch from EI to CI Mode
144 7000/7010 Series TQ GC/MS Operating Manual
To Pumpdown and Switch from EI to CI
Mode
This procedure assumes that the instrument is switching from EI to CI mode,
and will be PCI tuned using methane after the system is stable.
Procedure
1 Follow the instructions for the EI MS pumpdown. (See “To Pumpdown the
MS” on page 120.)
After the software prompts you to turn on the GC/MS interface heater and
GC oven, perform the following steps.
2 Load a PCI tune file by clicking on the Files and Report tab, then click Load in
the Tune File area. Select a PCI tune file, and click OK. Always start up and
verify system performance in PCI mode before switching to NCI.
3 In Instrument Control view, select Instrument > Gas Controller Configuration
to display the Gas Controller Configuration dialog. (See Figure 45.)
Figure 45. Gas controller configuration for CI
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