Instrument Gas Mixture
Leak Detection Mixture
It can detect much smaller leaks due to the size of the test gas molecules. Helium molecules are far smaller than nitrogen molecules and so are better able to pick up small leaks in a refrigeration system. Safe and easy to use, inert and non-flammable.
Few examples are given below
Halcarbon 12 0.5-3% + Nitrogen Balance
Helium 05-10% + Nitrogen Balance