CI Troubleshooting 3
Troubleshooting and Maintenance Manual 63
Saturated methane/isobutane gas purifier
Replace the gas purifier. See “To Replace the Methane/Isobutane Gas Purifier”
on page 91
Poor quality methane (purity below 99.99%)
Replace the methane with high-purity methane. If necessary, clean and purge
the reagent gas lines and clean the ion source.
Reagent gas flows too high (in EI/PCI MSs)
Verify that the reagent gas setup is correct.
Peak at m/z 32
A visible peak at m/z 32 in methane pretune often indicates air in the system.
New or dirty reagent gas supply tubing
Purge the reagent gas supply lines and flow module for at least 60 minutes.
See the Agilent 7200 Accurate-Mass Q-TOF GC/MS System Operation Manual.
Air leak
Check for leaks and correct any that you find. See “Air Leaks” on page 52.
After all leaks have been corrected, clean the ion source.
Contaminated reagent gas supply. Suspect this if you have recently replaced
your gas tank, and you have ruled out air leaks.
Replace the reagent gas supply.
The capillary column is broken or disconnected.
Inspect the capillary column. Make sure it is not broken and it is installed
correctly.
Saturated methane/isobutane gas purifier
Replace the gas purifier.
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