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Helium leak testing information

Helium leak testing is a testing method where helium gas is used to trace leaks. Due to the small atomic size helium passes easily through leaks, which makes it a very accurate and reliable testing method. Another benefit of helium for leak testing is that it's non-toxic, inert, non-condensable and non-flammable.

Helium leak testing is carried out using a helium leak detector, also called a Mass Spectrometer Leak Detector (MSLD). Helium leak detectors are used to locate the leak and measure the size of a leak. Helium as a tracer gas is introduced into a test part that is connected to the leak detector. The helium leaking through is measured by the detector and the result is displayed on the device.

Helium Leak testing in practise

What is necessary to perform helium leak tests in practise?

  • Spectrometer to detect the mass of helium
  • A vacuum system to maintain pressure
  • Fixturing to attach the test-part to the detector
  • A mechanical pump to evacuate the test-part
  • An amplifier and readout instrument.

Helium leak testing methods

In general there are two methods for helium leak testing: Vacuum Testing and pressure testing. The right method is to be chosen based on the working conditions of the part to be tested. Consult your dealer or go to a leak test centre.

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