EP0328640A1
Expired / Lapsed
EP
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Combustible gas sensor
Assignee: Daikin Industries Ltd
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Filing: 1987-07-28
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Granted: —
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Expires: 2007-07-28
Abstract
Abstract A working electrode (2) and a counter electrode (4) are disposed with a predetermined spacing between them on the surface of an insulating substrate (1) and their surfaces are covered with a gas-permeable proton-conductive film (5) for integration. When a predetermined voltage is applied between both electrodes, a combustible gas that has permeated through the gas-permeable proton-conductive film is subjected to oxidation-reduction reaction on the surface of the working electrode and the generated proton migrates towards the counter electrode inside the gas-permeable proton-conductive film so that the concentration of the combustible gas can be measured. It is also possible to dispose a reference electrode in order to stablize the potential of the working electrode, and application to a field effect transistor type gas sensor is also possible.
Inventors
- 👤 Y. C/O Shiga Works Of Daikin Ind. Ltd. Nagata
- 👤 Satoru C/O Daikin Industries Ltd. Sato
- 👤 K. C/O Shiga Works Of Daikin Ind. Ltd. Furuya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 06:00
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/414; G01N27/4141; G01N27/416; G01N27/404; G01N27/4045
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
75 words
A flammable-gas sensor comprising: an insulating substrate (1), a working electrode (2) provided at the surface of said insulating substrate (1), a counter electrode (4) provided at a surface of said insulating substrate (1) and positioned with a set gap from said working electrode (2), and a gas-permeable, proton-conductive film (5) which covers said working electrode (2) and counter electrode (4) and forms an integrated whole with said working electrode (2) and counter electrode (4).
Claim 2
Dependent Claim
75 words
A flammable-gas sensor comprising: an insulating substrate (1), a working electrode (2) provided at the surface of said insulating substrate (1), a counter electrode (4) provided at a surface of said insulating substrate (1) and positioned with a set gap from said working electrode (2), and a gas-permeable, proton-conductive film (5) which covers said working electrode (2) and counter electrode (4) and forms an integrated whole with said working electrode (2) and counter electrode (4).
Claim 3
Dependent Claim
27 words
A flammable-gas sensor as claimed in Claim 1, wherein said counter electrode is larger in area than said working electrode by a factor of 10 or more.
Claim 4
Dependent Claim
107 words
A flammable-gas sensor comprising: an insulating substrate (1), a working electrode (2) provided at a surface of said insulating substrate (1), a counter electrode (4) provided at the surface of said insulating substrate (1) and positioned with a set gap from said working electrode (2), a reference electrode (3) provided at the surface of said insulating substrate (1) and positioned with set gaps from said working electrode (2) and counter electrode (4), a gas-permeable, proton-conductive film (5) which covers said working electrode (2), counter electrode (4) and reference electrode (3) and forms an integrated whole with said working electrode (2), counter electrode (4) and reference electrode (3).
Claim 5
Dependent Claim
107 words
A flammable-gas sensor comprising: an insulating substrate (1), a working electrode (2) provided at a surface of said insulating substrate (1), a counter electrode (4) provided at the surface of said insulating substrate (1) and positioned with a set gap from said working electrode (2), a reference electrode (3) provided at the surface of said insulating substrate (1) and positioned with set gaps from said working electrode (2) and counter electrode (4), a gas-permeable, proton-conductive film (5) which covers said working electrode (2), counter electrode (4) and reference electrode (3) and forms an integrated whole with said working electrode (2), counter electrode (4) and reference electrode (3).
Claim 6
Dependent Claim
25 words
A flammable-gas sensor as claimed in Claim 3, wherein said reference electrode and counter electrode form coaxial circles with said working electrode at the center.
Claim 7
Dependent Claim
20 words
flammable-gas sensor as claimed in Claim 3, wherein said reference electrode is positioned between said working electrode and counter electrode.
Claim 8
Dependent Claim
21 words
A flammable-gas sensor as claimed in Claim 3, wherein said counter electrode is positioned between said working electrode and reference electrode.
Claim 9
Dependent Claim
37 words
A flammable-gas sensor as claimed in Claim 3, wherein said working electrode is formed of a metal of a platinum group and said counter electrode is formed of a metal which does not react with flammable gases.
Claim 10
Dependent Claim
32 words
A flammable-gas sensor as claimed in Claim 3, wherein said working electrode is formed of gold and said counter electrode is formed of a metal which does not react with flammable gases.
Claim 11
Dependent Claim
26 words
A flammable-gas sensor as claimed in Claim 7, wherein each of said working electrode and counter electrode is formed of a metal of a platinum group.
Claim 12
Dependent Claim
21 words
A flammable-gas sensor as claimed in Claim 8, wherein each of said working electrode and counter electrode is formed of gold.
Claim 13
Dependent Claim
71 words
A flammable-gas sensor wherein one of a gate electrode and a source electrode of a field-effect transistor is formed of a metal of a platinum group and the other of the gate electrode and the source electrode is formed of a metal which does not react with flammable gases and a gas-permeable, proton-conductive film is provided to cover both said two electrodes and form an integrated whole with said two electrodes.
Claim 14
Dependent Claim
71 words
A flammable-gas sensor wherein one of a gate electrode and a source electrode of a field-effect transistor is formed of a metal of a platinum group and the other of the gate electrode and the source electrode is formed of a metal which does not react with flammable gases and a gas-permeable, proton-conductive film is provided to cover both said two electrodes and form an integrated whole with said two electrodes.
Claim 15
Dependent Claim
20 words
A flammable-gas sensor as claimed in Claim 11, wherein said metal which does not react with flammable gases is silver.
References Cited (Backward Citations)
No citation records indexed.
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