Operating in Chemical Ionization (CI) Mode 4
5975 Series MSD Operation Manual for MassHunter 115
8 Examine the displayed profile scan of the reagent ions.
• There should be no visible peak at m/z 32. A peak there indicates an air
leak. Repair the leak before proceeding. Operating in the CI mode with
an air leak will rapidly contaminate the ion source.
• The peak at m/z 19 (protonated water) is less than 50% of the peak at
m/z 17.
When prompted, click OK to perform the methane Flow Adjust.
Figure 22 Reagent ion scans
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