EP0154982A2
Expired / Lapsed
EP
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Electrochemical sensor
Assignee: Honeywell Inc
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Filing: 1985-03-13
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Granted: —
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Expires: 2005-03-13
Abstract
Abstract A thin-layer electrochemical cell for rapid detection of toxic chemicals and chemical agents has a large area thin- film sensing electrode (14) in contact with a very thin layer (17) of nonaqueous aprotic organic based electrolyte solution, and has a reference electrode (16) on the same surface (13) of a polymer membrane (11). A counter electrode (22, 23) is positioned in a different plane beyond the edge of the large area sensing electrode.
Inventors
- 👤 Hanumanthiya V. Venkatasetty
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 10:56
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/4045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
164 words
An electrochemical sensor for detection of toxic gas or vapor mulecules in the surrounding atmosphere. characterized by : a) a badge type enclosure (10) having an opening on one face for admitting gases and vapors to be sensed from the surrounding atmosphere; b) a porous polymer membrane (11) having an outer and an inner surface (13), a substantial portion of the inner surface of said membrane being coated/with an inert thin conducting film which forms a sensing electrode (14) the outer surface at said opening being in communication with said atmosphere; c) a reference electrode (16) fabricated on a separate portion of said inner surface (13) by coating said membrane (11) separate portion with a metal/metal ion film; d) a counter electrode inert film (22,23) located beyond the edge of said membrane (11) and electrically separated from said sensing (14) and reference (16) electrodes; and, e) a thin layer (17) of nonaqueous electrolyte solution in said enclosure (10) in contact with said electrodes (14,16).
Claim 2
Dependent Claim
164 words
An electrochemical sensor for detection of toxic gas or vapor mulecules in the surrounding atmosphere. characterized by : a) a badge type enclosure (10) having an opening on one face for admitting gases and vapors to be sensed from the surrounding atmosphere; b) a porous polymer membrane (11) having an outer and an inner surface (13), a substantial portion of the inner surface of said membrane being coated/with an inert thin conducting film which forms a sensing electrode (14) the outer surface at said opening being in communication with said atmosphere; c) a reference electrode (16) fabricated on a separate portion of said inner surface (13) by coating said membrane (11) separate portion with a metal/metal ion film; d) a counter electrode inert film (22,23) located beyond the edge of said membrane (11) and electrically separated from said sensing (14) and reference (16) electrodes; and, e) a thin layer (17) of nonaqueous electrolyte solution in said enclosure (10) in contact with said electrodes (14,16).
Claim 3
Dependent Claim
16 words
The sensor according to claim 1, characterized in that said porous polymer membrane (11) is polytetrafluoroethylene.
Claim 4
Dependent Claim
29 words
The sensor according to claim 1 or 2, characterized in that said film (14) of inert conducting material is selected from the group consisting of platinum, gold and carbon.
Claim 5
Dependent Claim
20 words
The sensor according to claim 1, 2 or 3, characterized in that said metal/metal ion film (16) is silber/silver ion.
Claim 6
Dependent Claim
20 words
The sensor according to claim 1, 2 or 3, characterized in that said metal/metal ion film (16) is silver/silver chloride.
Claim 7
Dependent Claim
27 words
The sensor according to one of the preceding claims, characterized in that the membrane (11) is of a non-wetting material with respect to said nonaqueous electrolyte solution.
Claim 8
Dependent Claim
23 words
The sensor according to one of the preceding claims, characterized in that said reference electrode (16) is planar with said sensing electrode (14).
Claim 9
Dependent Claim
52 words
The sensor according to one of the claim 1 to 7, characterized in that said nonaqueous electrolyte solution consists of a solvent selected from the group consisting of r-butyrolactone, propylene carbonate and N,N' dimethylformamide, and of an electrolyte selected from the group consisting of lithium perchlorate, tetraalkyl ammonium perchlorate and tetraethylammonium perchlorate.
Claim 10
Dependent Claim
65 words
A sensor according to one of the preceding claims, characterized in that the polymer membrane (11) supports both electrodes (14,16) in a coplanar arrangement; that the counter electrode (22,23) is located in a plane different from said membrane (11) and electrodes (14,16); that the thin layer (17) of nonaqueous electrolyte solution adjacent and enveloping said sensing and reference electrodes extends to envelop said counter electrode.
Claim 11
Dependent Claim
38 words
A sensor according to one of the preceding claims, characterized by a substrate (20), preferably a glas or ceramic substrate, supporting the thin layer (17) of nonaqueous electrolyte solution and the membran (11) with the associated electrodes (14,16).
References Cited (Backward Citations)
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