6 Operating in CI Mode
To Set a Reagent Gas Flow
7000/7010 Series TQ GC/MS Operating Manual 141
To Set a Reagent Gas Flow
Procedure
1 In Instrument Control panel, select the MS Tune icon to display the Triple
Quadrupole MS Tune window. Select the Manual Tune tab, then select the
Ion Source tab to display the ion source parameters.
2 In the CI Reagent Gas Control area, select CI Gas A if you are using methane
for the reagent gas or select CI Gas B to use the reagent gas attached to the
CI reagent gas controller’s B gas inlet for the reagent gas.
3 Enter the reagent gas flow setpoint in the CI Gas Flow field. This value is
entered as a percentage of maximum flow rate. The recommended flow is
20% for a PCI source and 40% for an NCI source.
4 Click Set. The Flow Set indication is displayed.
The reagent gas is flowing into the ion source at the rate displayed next to the
setpoint.
5 Click the Files and Reports tab, then click Save to save your changes to the
currently loaded tune file.
After the system has been switched from EI to CI mode, or vented for any other
reason, the MS must be baked out for at least 2 hours before tuning.
Continuing with CI autotune if the MS has an air leak or large amounts of water
will result in severe ion source contamination. If this happens, you will need to
vent the MS and clean the ion source.
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