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Leak detection knowledge

Why use helium as leak detection gas?

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1. Helium has small molecular weight, strong diffusivity and high permeability, so it can pass through very small pores.

2. The volume content of helium in the air is about 5ppm, which indicates that the helium content in the normal air environment is very small, that is, the helium background is very good.

3. Helium is a non-toxic, colorless and tasteless inert gas, which means that under normal circumstances, it can exist in all objects as a medium without reaction.

4. It is easy to distinguish from other substances in the spectrum of mass spectrometer.

5. Considering the above characteristics, helium is the best choice as a tracer gas for leak detection.

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