High pressure membrane introduction for a mass spectrometer

Details High pressure membrane introduction for a mass spectrometer High pressure membrane introduction for a mass spectrometer

2008-06-10

2008-06-10

Berman, Jack I. (Department: 2881)

Radiant energy

Ionic separation or analysis

With sample supply means

C250S281000, C250S292000, C073S863230, C073S864730

Reexamination Certificate

active

07385191

ABSTRACT:
A membrane-introduction mass spectrometer (MIMS) device has a sample inlet assembly provided with a membrane held by an outer retaining ring across the entrance of a central passage, a porous metal frit backing the membrane, and a cylindrical support piece supporting the frit. In a preferred embodiment, the membrane is a 10-micron thickness layer of silicone evenly coated upon an inert polymer backing material. The porous frit is a titanium or steel sponge metal. The cylindrical support piece is made of titanium with small, drilled thru-holes to allow passage of gases and volatile organics into the mass spectrometer. The sample inlet assembly includes a high-pressure temperature probe for sensing fluid temperature to correct for temperature variations in membrane diffusion rates. The sample inlet assembly is provided as a front end to an underwater sampling probe.

REFERENCES:
patent: 6727498 (2004-04-01), Fries et al.
patent: 2004/0089079 (2004-05-01), Engebretson

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