Types of Leaks
Typically there are two types of leaks in the detection of helium as a tracer for leak detection.
- Residual leak: A residual leak is a real leak that may be gross, or small, according to the sensitivity setting of the leak detector.
- Virtual leak: A virtual leak is the semblance of a leak in a vacuum system caused by slow release of trapped gases, as gases may adhere as pockets to the interior sides of a chamber. This can cause confusion to the operator as it may be a false indication of a present leak.
Read more about this topic: Helium Mass Spectrometer
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