What are some common methods for helium leak testing a vacuum system?

What are some common methods for helium leak testing a vacuum system?
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1 Answer

Answer :

It is common to have a location in the suction line of the pump to detect the helium. Then, the helium  source is passed over the flanges and other possible sources of leakage. This is done while monitoring  the detector at the pump suction for detectable amount of helium. Alternatively, if your system can take  pressure as well as vacuum you can try pressuring it up and looking for the leaks that way. As yet  another alternative, you can install an IR unit to the suction of the pump and spray isopropyl alcohol on  the flanges.
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