Integrated gas sensitive unit comprising a gas sensitive semicon

Measuring and testing – Gas analysis – Gas chromatography

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338 34, G01N 2712

Patent

active

043779441

ABSTRACT:
For use in a gas sensor, an integrated gas sensitive unit comprises, on a single principal surface, a gas sensitive semiconductor element and a first resistor member connected to the element in series for deriving an electrical signal from the element. Both of the element and the first resistor member may be formed by the thick-film integration technique. A heating wire may be attached to the back surface opposite to the principal surface. A combination of secnd and third resistor members may be electrically connected to the series connection in parallel with the second and the third resistor members brought into electrical contact with the element and the first resistor member, respectively, to form a bridge circuit. The combination may be formed on the principal surface together with the series connection or separated from the series connection. Preferably, the first or the second resistor member has the same temperature dependency as the element when the heating wire is attached to the bridge circuit.

REFERENCES:
patent: 3578409 (1971-05-01), Silverman et al.
patent: 3901067 (1975-08-01), Boardman, Jr. et al.
patent: 4007435 (1977-02-01), Tien

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