The Helium saturation chambers are used to inject helium into small, sealed devices in preparation for helium leak testing. The saturation method is commonly used when it is impractical to inject the helium tracer gas into the part during assembly. Generally, saturation is best suited for hermetically sealed devices with small internal cavities and is normally performed with batched parts.

During the saturation process helium flows into the test part through a leak defect. Following the saturation process, the part is placed in a separate vacuum chamber for helium leak testing. The helium that leaked into the part during the saturation will then leak out of the part during leak testing and the part will be classified as a leak.