CO gas detecting device and circuit for driving the same
First Claim
1. A CO gas detecting device comprising:
- a CO gas sensor provided with a gas sensitive member comprising an oxide semiconductor whose resistance value is changed when contacted with a reducing gas, a pair of electrodes provided on said gas sensitive member, and a catalyst layer comprising one or more catalyst metals selected from the group consisting of Pt, Pd and Rh and at least one carrier selected from the group consisting of Al2 O3, ZrO2 and SiO2, provided on said gas sensitive member; and
a reference sensor substantially without sensitivity to CO gas provided with a gas sensitive member comprising an oxide semiconductor whose resistance value is changed when contacted with a reducing gas, a pair of electrodes provided on said gas sensitive member, and an insulative catalyst layer comprising Ag and at least one carrier selected from the group consisting of Al2 O3, ZrO2 and SiO2, provided on said gas sensitive memberwherein said catalyst layers of each of said sensors comprise said catalyst metals in an amount of from about 0.05 to 20 wt. % based on the catalyst carrier in a thick film of from 10 to 50 μ
m and from about 1 to 90 wt. % based on the catalyst carrier in a thin film of from about 5 to 1000 nm, such that the amounts of said catalyst metals are below levels at which the electroconductivity of said layers hampers measurement of said resistance value.
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Accused Products
Abstract
Disclosed is a CO gas detecting device which comprises a CO gas sensor provided with a gas sensitive member made of SnO2, ZnO, Fe2 O3 or the like, a pair of electrodes provided on said gas sensitive member, and a catalyst layer comprising at least one kind of catalyst metals of Pt, Pd and Rh and at least one kind of carriers of Al2 O3, ZrO2 and SiO2, provided on said gas sensitive member; and a reference sensor substantially without sensitivity to CO gas provided with a gas sensitive member similar to the above gas sensitive member, a pair of electrodes provided on said gas sensitive member and a catalyst layer comprising Ag and at least one kind of carriers of Al2 O3, ZrO2 and SiO2, provided on said gas sensitive member. Also disclosed is a circuit for driving the device.
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Citations
16 Claims
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1. A CO gas detecting device comprising:
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a CO gas sensor provided with a gas sensitive member comprising an oxide semiconductor whose resistance value is changed when contacted with a reducing gas, a pair of electrodes provided on said gas sensitive member, and a catalyst layer comprising one or more catalyst metals selected from the group consisting of Pt, Pd and Rh and at least one carrier selected from the group consisting of Al2 O3, ZrO2 and SiO2, provided on said gas sensitive member; and a reference sensor substantially without sensitivity to CO gas provided with a gas sensitive member comprising an oxide semiconductor whose resistance value is changed when contacted with a reducing gas, a pair of electrodes provided on said gas sensitive member, and an insulative catalyst layer comprising Ag and at least one carrier selected from the group consisting of Al2 O3, ZrO2 and SiO2, provided on said gas sensitive member wherein said catalyst layers of each of said sensors comprise said catalyst metals in an amount of from about 0.05 to 20 wt. % based on the catalyst carrier in a thick film of from 10 to 50 μ
m and from about 1 to 90 wt. % based on the catalyst carrier in a thin film of from about 5 to 1000 nm, such that the amounts of said catalyst metals are below levels at which the electroconductivity of said layers hampers measurement of said resistance value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification