leakage testingflow testfunctional testing

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
  • no influence on the measurement result through thermal effects
  • oldest and best-known gas detection method

Drawbacks:

  • expensive and sensitive sensor equipment
  • very high expenditure for peripheral applicances
  • high vacuum components required
  • sensitive to moisture and pollution
  • disturbances through natural occurrence of helium in the atmosphere
  • often unsuitable for testing plastic parts due to high permeation of helium
  • usually unsuitable for leakage rates >0.1 cc/min


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