88 Operation Manual
4 Operating in Chemical Ionization (CI) Mode
To Perform a CI Autotune
To Perform a CI Autotune
Procedure
1 Verify that the MS performs correctly in EI mode first.
2 Click the MS Tune icon in the Instrument Control panel to
display the GC/Q-TOF Tune dialog box.
3 If necessary, load a new tune file by clicking on the Files and
Report tab then click the Load button in the Tune File area.
Select a tune file and click the OK button.
The tune file must match the type of ion source in the
analyzer. For a CI ion source select a tune file created for a
positive or negative CI source.
4 Click the Autotune tab and select PCI source for a positive CI
source or NCI source for a negative CI source.
5 Select the reagent gas you are using from the dropdown
menu in the CI Reagent Gas area.
6 If a log file and associated data files of the tune are required,
click the Files and Reports tab and in the Log Files section, click
on the Browse button to create a directory and files for the
logs. Click on the required log and data files check boxes.
7 Click on the Manual Tune tab and select the Ion source tab. In
the CI Reagent Gas section, select the reagent gas and then
enter a CI Gas Flow rate of 20% for a PCI source or 40% for an
NCI source. Click on the Autotune tab to return to Autotune.
CAUTION
Always verify MS performance in EI before switching to CI operation.
CAUTION
Avoid tuning more often than is absolutely necessary; this will
minimize PFDTD background noise and help prevent ion source
contamination.
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