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Troubleshooting
CAUTION
Often, major air leaks are accompanied by a hissing sound. These leaks may
be due to extremely loose fittings, improperly seated O-rings, or open valves.
If you suspect a major leak, do not turn on the electron multiplier, RF voltage,
or filament. Using the Diagnostics section, confirm that the turbomolecular
pump is operating at 100% speed or diffusion pump is ready. If it is not, you
may be sure there is a major air leak.
4. Enter System Control:
•
Click on Auto Tune Box
•
Click on Air/Water Check
•
Click on Start Auto Tune
5. Compare your air/water spectra to the following:
Air/water spectrum from an instrument with a gross air leak
•
If the peaks at masses 32 (O
2
+), 28 (N
2
+), and 18 (H
2
O+) are severely
broadened or undifferentiated, your system has a large air leak.
Immediately turn off Air/Water Check.
