Peak At M/Z 32 - HP 5973 MSD Hardware Manual

 Troubleshooting
3HDN DW P] 

Peak at m/z 32

A visible peak at m/z 32 in methane pre-tune often indicates air in the system.
Possible Cause
Residual air from recent venting — check for water indicated by a large peak at
m/z 19.
Action Bake out the system as described in the Maintenance chapter of this manual.
Possible Cause
New or dirty reagent gas supply tubing.
Action
Purge the reagent gas supply lines and flow module for at least 60 minutes as
described in the Maintenance chapter of this manual.
Possible Cause
Air leak.
Action Check for leaks and correct any that you find. See the Leaks section at the end of
this chapter for more information. After all leaks have been corrected, clean the ion
source.
Possible Cause Contaminated reagent gas supply. Suspect this if you have recently replaced your
gas tank, and you have ruled out air leaks.
Action
Replace the reagent gas supply.
Possible Cause
The capillary column is broken or disconnected.
Action Inspect the capillary column. Make sure it is not broken and it is installed correctly.
Possible Cause
Saturated methane / isobutane gas purifier.
Action
Replace the gas purifier.
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