As well as helium mass spectrometer leak detectors there are a wide range of leak detectors available using different technologies to recognise and respond to specific gases.
Helium is ideal as a leak test gas due to the small molecule and it͛s rarity in atmospheric air, however other gases can still be adequately detected in atmosphere or vacuum to an acceptable sensitivity for many industrial applications.
Most ͚Gas Specific͛ leak detectors will use an electronic sensor or a similar element which responds to the gas compare the sensor͛s response to the gas sample to it͛s response to atmospheric air highlighting and responding to any difference.
It's important to maintain a clear stable background when using gas specific detectors and if this is not possible the sensitivity can be reduced.
Portable / Hand-Held Trace Gas Detectors: