App Note: High Efficiency Helium Leak Check
Using Alicat Instruments in High Efficiency Helium Leak Check via Helium Mass Spectrometer Leak Detection (HMSLD)
The interior of a test article is connected to a mass spectrometer leak test apparatus. This is placed in a chamber. The chamber is evacuated through a connection to an Alicat PCD-30PSIA-D Dual Valve Absolute Pressure Controller.
The chamber is then refilled to slightly above atmospheric pressure, with helium. This provides a pure helium environment for testing leakage flow from the outside of the test article to its interior. The interior of the test article is evacuated by the leak test apparatus.
- A stable, reproducible helium atmosphere is created around the test article.
- Helium usage is reduced as compared to continuous flow systems.