EP0247941A2
Expired / Lapsed
EP
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Gas sensor
Assignee: Terumo Corp
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Filing: 1987-05-26
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Granted: —
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Expires: 2007-05-26
Abstract
Abstract A gas sensor includes a multi-layered solid-state pH electrode and a reference electrode coated with a gas-sensitive layer (solid-state or gel-state) sensitive to an ion of interest, the surface of the combination being coated with a gas-permable layer. Also provided in a gas sensor having a pH electrode and a reference electrode immersed in a gas-sensitive solution within a gas-permeable layer. Preferably, a fixed distance is maintained between a sensitive portion of the pH electrode, a sensitive portion of the reference electrode and the gas-permeable layer isolated by means of a porous layer. In another embodiment, the gas sensor incorporates a common electrode and a thermister for temperature calibration.
Inventors
- 👤 Shuichiro Yamaguchi
- 👤 Norio Daikuhara
- 👤 Takeshi Shimomura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 00:43
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/403; G01N27/4035
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
81 words
A gas sensor comprising: a pH electrode which includes an electrically conductive substrate, a redox layer coating a surface of said electrically conductive substrate, and a hydrogen ion carrier layer coating a surface of said redox layer; a reference electrode; an insulating layer for insulating said pH electrode and said reference electrode; a gas-sensitive layer coating exposed surface portions of said pH electrode, said insulating layer and said reference electrode; and a gas-permeable layer coating a surface of said gas-sensitive layer.
Claim 2
Dependent Claim
81 words
A gas sensor comprising: a pH electrode which includes an electrically conductive substrate, a redox layer coating a surface of said electrically conductive substrate, and a hydrogen ion carrier layer coating a surface of said redox layer; a reference electrode; an insulating layer for insulating said pH electrode and said reference electrode; a gas-sensitive layer coating exposed surface portions of said pH electrode, said insulating layer and said reference electrode; and a gas-permeable layer coating a surface of said gas-sensitive layer.
Claim 3
Dependent Claim
23 words
The gas sensor according to claim l, wherein said reference electrode comprises a silver having a silver chloride formed on a surface thereof.
Claim 4
Dependent Claim
31 words
The gas sensor according to claim l, wherein said gas-sensitive layer comprises an aqueous solution of polyvinyl alcohol dissolved in a solvent which contains a salt derived from the interest gas.
Claim 5
Dependent Claim
15 words
The gas sensor according to claim l, wherein said gas-permeable layer comprises a silicone membrane.
Claim 6
Dependent Claim
47 words
A gas sensor comprising: a pH electrode having a sensitive portion; a reference electrode having a sensitive portion; and a gas-permeable layer contacting the sensitive portion of said pH electrode and the sensitive portion of said reference electrode through the intermediary of a gas-sensitive solution or gel.
Claim 7
Dependent Claim
47 words
A gas sensor comprising: a pH electrode having a sensitive portion; a reference electrode having a sensitive portion; and a gas-permeable layer contacting the sensitive portion of said pH electrode and the sensitive portion of said reference electrode through the intermediary of a gas-sensitive solution or gel.
Claim 8
Dependent Claim
29 words
The gas sensor according to claim 5, further comprising a porous layer for maintaining a constant spacing between the sensitive portion of said pH electrode and said gas-permeable layer.
Claim 9
Dependent Claim
12 words
The gas sensor according to claim 5, further comprising a common electrode.
Claim 10
Dependent Claim
45 words
The gas sensor according to claim 5, wherein said pH electrode comprises: an electrically conductive substrate; a redox layer coating a surface of said electrically conductive substrate; and a hydrogen ion carrier layer, which is sensitive to a hydrogen ion concentration, coating said redox layer.
Claim 11
Dependent Claim
40 words
The gas sensor according to claim 5, wherein said reference electrode comprises: an agar-agar gel containing saturated sodium chloride partitioned by at least two barrier walls penetrated by a hollow fiber, and a silver/silver chloride electrode in said agar-agar gel.
Claim 12
Dependent Claim
32 words
l0. The gas sensor according to claim 5, wherein said gas-sensitive solution comprises an aqueous solution of polyvinyl chloride dissolved in a solvent which contains a salt derived from the interest gas.
Claim 13
Dependent Claim
15 words
The gas sensor according to claim 5, wherein said gas-permeable layer comprises a silicone membrane.
Claim 14
Dependent Claim
49 words
A gas sensor comprising: a pH electrode having a sensitive portion; a reference electrode having a sensitive portion; a thermister; and a gas-permeable layer contacting the sensitive portion of said pH electrode, the sensitive portion of said reference electrode and said thermister through the intermediary of a gas-sensitive solution.
Claim 15
Dependent Claim
49 words
A gas sensor comprising: a pH electrode having a sensitive portion; a reference electrode having a sensitive portion; a thermister; and a gas-permeable layer contacting the sensitive portion of said pH electrode, the sensitive portion of said reference electrode and said thermister through the intermediary of a gas-sensitive solution.
Claim 16
Dependent Claim
33 words
The gas sensor according to claim l2, wherein said pH electrode further comprising a porous layer for maintaining a constant spacing between the sensitive portion of said pH electrode and said gas-permeable layer.
Claim 17
Dependent Claim
12 words
The gas sensor according to claim l2, further comprising a common electrode.
Claim 18
Dependent Claim
45 words
The gas sensor according to claim l2, .wherein said pH electrode comprises: an electrically conductive substrate; a redox layer coating a surface of said electrically conductive substrate; and a hydrogen ion carrier layer, which is sensitive to a hydrogen ion concentration, coating said redox layer.
Claim 19
Dependent Claim
40 words
The gas sensor according to claim l2, wherein said reference electrode comprises: an agar-agar gel containing saturated sodium chloride partitioned by at least two barrier walls penetrated by a hollow fiber, and a silver/silver chloride electrode in said agar-agar gel.
Claim 20
Dependent Claim
31 words
The gas sensor according to claim l2, wherein said gas-sensitive solution comprises an aqueous solution of polyvinyl chloride dissolved in a solvent which contains a salt derived from the interest gas.
Claim 21
Dependent Claim
15 words
The gas sensor according to claim l2, wherein said gas-permeable layer comprises a silicone film.
References Cited (Backward Citations)
No citation records indexed.
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