Gas sensor based on semiconductor oxide, for gaseous hydrocarbon

Details Gas sensor based on semiconductor oxide, for gaseous hydrocarbon Gas sensor based on semiconductor oxide, for gaseous hydrocarbon

1993-12-17

1995-03-28

Williams, Hezron E.

Measuring and testing

Gas analysis

Detector detail

340634, 422 98, G01N 2712

Patent

active

054006430

ABSTRACT:
A sensor device for gaseous hydrocarbons includes two semiconductor oxide-based sensitive elements, one of which is a sensitive reference element and the other a sensitive measuring element, this measuring element being covered with a layer of electrically insulating porous material containing a dispersed noble metal. The two sensitive elements are formed by silk-screen processes, are connected to an electronic signal comparison system, and are maintained at different temperatures when in operation. The sensor has improved selectivity in determining gaseous hydrocarbons, in particular methane, even if high concentrations of interfering gases such as ethanol are present.

REFERENCES:
patent: 4443791 (1984-04-01), Risgin et al.
patent: 4453397 (1984-06-01), Ohta et al.
patent: 4490715 (1984-12-01), Kusanagi et al.
patent: 4840913 (1989-06-01), Logothetis et al.
patent: 5104513 (1992-04-01), Lee et al.

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