Helium method (vacuum test)

Test medium: Helium

Detectable leakage rates: >0.000 000 01 cc/min

Method:
test piece is pressurized. Through leakages test gas emerges into a vacuum chamber enclosing the test piece which is connected to a mass spectrometer for determining the helium concentration. After calibration with a test leak the overall leakage rate can be determined quantitatively.

 

 

 

 

 

 

 

Example: Helium method (vacuum test)

Advantages:

  • extremely low leakage rates detectable
  • very short test sequences realisable
  • no influence on the measurement result through thermal or elastic effects

Drawbacks:

  • more expenditure for vacuum chamber and pumps
  • more expenditure for maintenance


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