Measuring and testing – With fluid pressure – Leakage
Patent
1995-02-14
1998-11-03
Brock, Michael
Measuring and testing
With fluid pressure
Leakage
73 407, G01M 332
Patent
active
058311475
ABSTRACT:
A method and apparatus for leak testing an article in which an evacuable test chamber and a mass spectrometer leak detector are provided. The conduit links the test chamber and the mass spectrometer. A first valve is provided nearer the test chamber and a second valve is provided nearer the leak detector for controlling the flow through the conduit and for defining between the valves the trapped volume that is associated with the conduit. The trapped volume is evacuated with the first valve closed and the second valve opened. The pressure differential between the first point situated intermediate the first valve and the test chamber is measured and a second point situated intermediate the second valve and the leak detector is measured. The pressure differential between the first and second points is measured and a pressure differential reference point is determined. The second valve is closed to form the trapped volume and the first valve is opened to communicate the trapped volume and the evacuation chamber. The pressure differential between the first and second points is then measured and compared with the pressure differential reference point. The rate of change of the pressure differential is measured between the first and second points subsequent to the communication of the trapped volume and the test chamber. The second valve is opened to allow further evacuation purging of the chamber and the conduit.
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Brock Michael
Pace Salvatore P.
Rosenblum David M.
The BOC Group plc
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