詳細
The part to be tested is directly connected to a mass spectrometer and put inside a chamber. Vacuum is created inside the part and the helium concentration in the chamber is raised to 100%.
If a leakage is present, the molecules of helium migrate into the part and the leakage is measured by the spectrometer.
The possible leak range to be detected is from 5.0 x 10-3 mbar*L/s to 5.0 x 10-8 mbar*L/s.
This test is frequently used to check porosities in cast parts or for parts that operate under vacuum, as water pumps and brake pumps.
