Example: 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:
Drawbacks:
