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Tag: leak testing methods

How Is Leak Testing With Hydrogen Done?

A leak testing technique has been developed using a lighter gas-hydrogen. Hydrogen is the lightest and most viscous gas. It spreads quickly through test objects. 

Hydrogen can penetrate even the smallest leaks and is much more efficient at venting than other tracer gases. Hydrogen is more environmentally friendly than helium and costs less. Learn more about leak testing via

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Hydrogen can safely be used for leak tests if it is in the right concentration. The mixture of 5 percent hydrogen and 95% nitrogen is suitable for leak testing. This mixture can be purchased from most gas suppliers. 

Any hydrogen-nitrogen mixture less than 5.7 percent hydrogen, according to ISO 10156, is not flammable. Standard hydrogen-nitrogen combinations are used frequently as shielding gases in welding.

The cost of hydrogen detectors is much lower than mass spectrometers. Hydrogen detectors are equipped with microelectronic sensors, which gives them a high level of sensitivity and selectivity for hydrogen.

The operation of hydrogen leak detectors is simple. To search for hydrogen leaks, the test gas is injected into the object. A hand probe is connected to the hydrogen detector. It does not require suction so dust is not an issue. The probe can also be fitted with a protective cover to allow it to be used on damp objects.

An audio signal is sent by the detector to indicate leakage. The pitch of the signal will increase as the probe is closer to the leak site. It is not necessary to create a vacuum. This saves time and money.

A stationary sampling probe can be used to automate hydrogen leak testing. You can use the probe in either an accumulation chamber test, or a clampshell test.