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Common helium leak detection methods for helium mass spectrometer leak detectors include the helium hood method and the spraying method

Common helium leak detection methods for helium mass spectrometer leak detectors include the helium hood method and the spraying method

The helium hood method involves enclosing the test piece with a test hood. Before leak detection, the air inside the hood is removed, and then 100 kPa of helium is introduced. When the leak detector output shows a change, it indicates that the test piece under the helium hood has a leak. The test hood can be made of plastic film. For large quantities of small parts, a dedicated rigid test hood can also be made, allowing the pressure of the introduced leak detection gas to be higher than 100 kPa to improve the leak detection sensitivity.

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