Gas mixtures with helium are suitable for leak-testing of safety-critical components but helium gas is expensive. Witt’s modern gas technology makes it possible to reduce helium consumption, resulting in the lowering the costs.
The expensive nature of helium means the gas is generally not used in its pure form, but as part of gas mixtures, often with nitrogen.
Witt offers systems for the helium/nitrogen mixtures that counteract the price of helium and makes the process more economical.
The initial test gas mixture, e.g. 20% helium and 80% nitrogen, is generated used a WITT mixer. After the leak tightness test of the product, the mixture is discharged from the test sample into a pipeline or a buffer tank and analysed using a WITT gas analyser.
If helium has escaped during the test or if the test gas has mixed with ambient air from the test specimen, a WITT gas-dosing unit feeds in precisely enough helium to restore the required composition ratio of test gas.
The helium-nitrogen mixture prepared in this way can then be reused for further tests, all of which is done automatically.
Leak testing of systems and components is part of many industrial processes, such as the production of airbag inflators, gas containers, medical technology and more.
The physical properties of helium make it particularly suited to these tests: it has a small atomic radius, making it possible to detect the smallest leaks. It is also easy to detect, non-toxic, odourless and does not react with other materials.
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