5.1.3 Test gases
The test gases that are used for leak detection (also called tracer gases) should satisfy the following prerequisites:
They should
- Be non-toxic to humans, animals and the environment
- Not displace air, as hazardous situations, such as suffocation, could otherwise occur Be inert, i.e. slow to react, and should neither react chemically nor be flammable
- Not be present in air, if possible. Only with a gas that is present in the smallest possible concentration in the ambient air is it possible to detect even the smallest leaks
- Cannot be mistaken for other gases
The test gas helium satisfies all of these requirements. As a noble gas, it is not capable of chemically reacting. Only 5 ppm of it is present in atmospheric air, thus enabling even the smallest leakage to be detected. Since it is lighter than air, it thus does not pose a health hazard.
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