The main characteristics of helium mass spectrometry leak detection

Helium, high-purity helium

① Helium is commonly used as a tracer gas for helium mass spectrometer leak detectors. Due to the very low helium content in the air, accounting for only about 200000 parts, the background value of helium is low, which is conducive to discovering extremely small amounts of helium:

② Helium molecules are small in volume, light in weight, easy to diffuse, easy to penetrate, and easy to identify leaks

③ Helium ions have a low charge to mass ratio and are easy to perform mass spectrometry analysis;  

④ Helium is an inert gas with stable chemical properties that will not corrode or damage equipment

⑤ Helium is non-toxic, non condensable, and extremely difficult to store in water.

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Compared with traditional hydraulic leak detection, helium mass spectrometry leak detection technology has the advantages of fast speed, high accuracy, high sensitivity, and non-destructive testing. The use of hydraulic leak detection results in complex on-site operations that require specific requirements for water quality, water temperature, pressurization procedures, and pressurization equipment. For smaller leaks, the leakage point is not easy to detect. In some cases, large-scale removal of insulation layers is worth considering in terms of construction time and cost. By using a helium mass spectrometer leak detector to track the gradient changes in helium concentration, microcracks in the weld seam covered by the insulation layer can be quickly and accurately located.