Air Leaks; How Do I Know If I Have An Air Leak - Agilent Technologies 7250 Troubleshooting And Maintenance Manual

3 CI Troubleshooting

Air Leaks

How do I know if I have an air leak?

Run an air and water check. See the software online help for additional
information.
Large air leaks can be detected by vacuum symptoms: loud gurgling noise from
the foreline pump, inability of the turbo pumps to reach 95% speed, or, in the case
of smaller leaks, high pressure readings on the high vacuum gauge controller.
The mass flow controller is calibrated for methane and the high vacuum gauge
controller is calibrated for nitrogen, so measurements are not accurate in
absolute terms:
Familiarize yourself with the measurements on your system under operating
conditions. Watch for changes that may indicate a vacuum or gas flow problem.
There should not be any peak visible at m/z 32 (O
an air leak.
Figure 5.
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Looking for air leaks
7250 Accurate-Mass Q-TOF Troubleshooting and Maintenance Manual
). This almost always indicates
2