Operating in Chemical Ionization (CI) Mode 4
To Set a Reagent Gas Flow
Operation Manual 87
To Set a Reagent Gas Flow
Procedure
1 In Instrument Control panel, select the MS Tune icon to display
the GC/Q-TOF Tune dialog box. 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 the CI reagent gas you
are using.
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 the Set button. 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 the Save button to
save your changes to the currently loaded tune file.
CAUTION
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.
CAUTION
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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