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Thermo Fisher Scientific

Air leak


System air leak


Q Exactive GC

Exactive GC


Troubleshooting Tips:

  • Listen for a rush of air or a hissing sound inside the mass spectrometer. 
  • Possible causes of a major leak might be a loose or disconnected fitting, an improperly positioned O-ring, or an open valve.
  • If user suspects an air leak in the forevacuum region, check the vacuum tube for holes.
  • Check the clamp that fixes the vacuum tube to the forevacuum port (elbow) of the mass spectrometer. It might be loose because the forepump was shifted or the vacuum tube is twisted.


Sustained high pressure