Patent ID: 7320243
Filing Date: 2008-01-22
Classification: G01M

Abstract:
1. Apparatus for leak detection comprising: a first sealable chamber configured to receive a test piece containing a trace gas; a second sealable chamber; a first valve coupled between the first and second chambers; a leak detector having a test port, the leak detector comprising an ion pump; a trace gas permeable member coupled between the second chamber and the test port of the leak detector, the trace gas permeable member allowing the trace gas to pass and blocking other gases, liquids and particles; a vacuum pump having an inlet; a second valve coupled between the second chamber and the inlet of the vacuum pump; and a controller to control the permeable member at a high trace gas permeability at a first pressure of about 100 millitorr in the second chamber and to control the permeable member at a low trace gas permeability at a second pressure in the second chamber, which is lower then said first pressure and is suitable for operation of said leak detector.