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Helium leak detection basic principle of helium leak detection helium leak detection works by introducing helium to one side of a vacuum chamber wall, and using a highly sensitive mass spectrometer (tuned specifically to admit, ionize, and detect helium) to measure minute traces of the gas passing through the vessel wall. A sample of gas from within the container is drawn and passes through the mass spectrometer where any increase (over the background reading) in helium levels is indicative of a leak. The frequency of leak checks in a vacuum chamber largely depends on the usage and operational conditions of the chamber
For critical applications, such as those in research or manufacturing where vacuum integrity is paramount, routine leak checks should be performed monthly or even weekly. The chamber (or sample under test) is pressurised up with helium and the container is connected to the leak detector When it comes to locating vacuum chamber leaks, there are a few different methods that can be used depending on the vacuum level of the leak
What is a gas leak in a vacuum system
Understanding the different leak types, what is a leak rate and how to calculate leak size (gas) mass flow. A chamber test is critical for identifying leaks in sealed packaging or devices that lack accessible openings for traditional leak detection This technique, also known as metered volume fill, proves to be the most effective means of testing such products Zaxis leak testing equipment is the best solution for comprehensive leak detection on automation manufacturing lines
Leakage detection in vacuum systems any vacuum system may suffer leakages that prevents reaching the expected vacuum level to perform the required task Lowering the gas pressure inside the vacuum chamber causes the atoms and molecules to release in the chamber or penetrate through the leakage sources like holes and cracks into the chamber and hinders evacuating it (read more about effect of. An example of a virtual leak would be having a bolt inside of a vacuum chamber and when pulling a high vacuum, the air that is trapped between the bolt and vacuum chamber will be released into vacuum chamber making it look like there is a leak
Outgassing molecules released as gas or vapor from a material's surface or structure.
The main objective of helium leak testing is. The graphic bellow shows the distinction between the rate of rise curve related solely to desorption of gases from chamber walls and components in the vacuum system It is labeled 'pure gas desorption' There is also a line for 'pure leakage'
So in a system that has a leak the observer will see a combination of the two curves.
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