Apparatus for simultaneous detection of target gases

Details Apparatus for simultaneous detection of target gases Apparatus for simultaneous detection of target gases

1987-02-24

1990-03-27

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

73 23, 338 34, 422 90, 422 95, 422 98, 340634, G01N 3112

Patent

active

049118927

ABSTRACT:
A gas sensing thick film is positioned on an insulating substrate in contact with a pair of electrodes. A non-porous glass layer surrounds the film to stabilize it on the substrate. A heating element maintains the film at a preselected elevated temperature. The gas sensing thick film has a response characteristic for a preselected target gas to be detected which is enhanced by impregnating the film with platinum or palladium chlorine free compounds. The response characteristic of the gas sensing film is further increased by promoting combustion of interference gases on an outer filter layer fabricated of either conductive or nonconductive material. The incorporation of an insulating material between the gas sensing film and the outer filter layer also serves to increase the relative response of the gas sensing film to a preselected target gas.

REFERENCES:
patent: 3970431 (1976-07-01), Wise
patent: 4347732 (1982-09-01), Leary
patent: 4457161 (1984-07-01), Iwanaga et al.
patent: 4542640 (1985-09-01), Clifford

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