Selective gas sensor

Details Selective gas sensor Selective gas sensor

1990-10-30

1992-09-01

Warden, Robert J.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

422 98, 324663, G01N 2700, G01N 2704

Patent

active

051436965

ABSTRACT:
A sensor for selective determination of gases includes an electric capacitor having a gas permeable zeolite layer between 2 and 500 micrometer thick and being composed of a dielectric crystalline structure with a crystal size from 0.1 micrometer to 80 micrometer and having primary pores resulting in an internal surface from 100 to 1500 m.sup.2 /g, the diameter of the pores being between 0.1 and 1.5 nm which corresponds at least in order to magnitude to the kinetic diameter of the molecules of the gas to be detected, so that these molecules penetrate deep into the layer and its pores thereby changing the dielectric constant of the layer.

REFERENCES:
patent: 4164868 (1979-08-01), Suntola
patent: 4453151 (1984-06-01), Leary et al.
patent: 4564882 (1986-01-01), Baxter et al.
patent: 4654624 (1987-03-01), Hagan et al.
patent: 4795968 (1989-01-01), Madou et al.
patent: 4892834 (1990-01-01), Rauh
patent: 4893214 (1990-01-01), Nishiwak et al.

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