6 Operating in CI Mode
To Pumpdown and Switch from EI to CI Mode
7000/7010 Series TQ GC/MS Operating Manual 145
4 Select CI/JetClean - EI/CI system since this controller is installed for the CI
control option.
5 For Channel A gas, select Methane. Click OK.
6 Click the MS Tune icon in the Instrument Control panel to display the Triple
Quadrupole MS Tune window, and select the Vacuum Control tab to monitor
that the pressure is decreasing.
7 In the Triple Quadrupole MS Tune window, select the Manual Tune tab; then
select the Ion Source: CI+ tab, and then in the CI Reagent Gas Control area
select Gas Valve A for Methane gas. (See Figure 46.)
8 Set Gas A (methane) to 20%.
9 Set the GC/MS interface to 280 °C.
10 Let the system bake out and purge for at least 2 hours. If you will be running
NCI, for best sensitivity, bake out the MS overnight.
11 Click the MS Tune icon in the Instrument Control panel to display the Triple
Quadrupole MS Tune window and select the Autotune tab. The method
selects the correct PCI or NCI source and reagent gas setting.
12 Select the Tune from default settings check box because you have changed
the ion source.
13 Select the Print autotune report check box to automatically print a tune
report.
Figure 46. Setting reagent gas flow
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