Mass Extraction – The leak test procedure under vacuum without tracer gas
The Mass Extraction method is carried out under vacuum. This results in an improved detection limit and thermal decoupling due to the vacuum’s insulating effect. This type of test is particularly suitable for packaging or sealed objects such as encapsulated electronic assemblies. During the test, the test unit is placed in a vacuum chamber and the chamber is evacuated. The leakage rate of the test unit is determined by the flow from the test unit to the vacuum reservoir. With this method, a detection limit of up to 7 · 10-7 mbar · l/s can be achieved.
In an alternative process of this measuring principle, the interior of the test unit is evacuated and the penetrating ambient air is measured. This method reduces the costs of the test equipment because it does not require a vacuum chamber.