HP 5973 MSD, Hardware Manual

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86
Troubleshooting
3HDNDWP]
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.