US5393399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amperometric measuring device having an electrochemical sensor
Assignee: Cylergie GIE
•
Filing: 1993-09-07
•
Granted: 1995-02-28
•
Expires: 2013-09-07
Abstract
Abstract An amperometric sensor device comprises in combination a sensor (21) having a planar structure obtained by photolithographic techniques and a circuit (22) for measuring the intensity of the electrochemical current generated by the sensor (21). The planar structure has an insulating substrate (23 to 25) and a set of electrodes composed of a working electrode (29), a counter electrode (30) and a reference electrode (31). A diffusion membrane (32) is deposited on the working electrode (29). Connection means (26) are provided to connect the electrodes (29,30,31) to the measuring circuit (22). According to the invention, the active conducting part of the working electrode (29), situated at the surface of the substrate (23) is entirely covered by the diffusion membrane (32) which overlaps this electrode (29) over its entire peripheral zone, whereas this membrane is entirely exposed so that, during the operation of the device (20) it is in contact with the fluid to be analysed over its entire surface. The invention has applications in measuring the content of an oxygen reducible substance in a fluid, notably of chlorine in drinking water.
Inventors
- 👤 Albert Van den Berg
- 👤 Alain Grisel
- 👤 Martial Archenault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:18
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/4045
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
167 words
An amperometric sensor device for measuring the content of an oxygen reducible substance in a liquid, having in combination a sensor having a planar structure obtained by photolithograpic techniques and a circuit for measuring the intensity of the electrochemical current generated by said sensor, said structure comprising an insulating substrate a set of electrodes composed of at least one working electrode., one counter electrode and one reference electrode, at least said working electrode being disposed on said insulating substrate, said working electrode having an active surface only defined by a conductive part at the surface of said substrate, said device further comprising a diffusion membrane covering said conductive part of said working electrode While Overlapping the entire periphery of said conductive part, and connection means to connect said electrodes to said measuring circuit, said diffusion membrane, said reference electrode and said counter electrode being entirely exposed so that, when said device is functioning, they are in contact over their entire surfaces with the liquid to be analyzed.
Claim 2
Dependent Claim
167 words
An amperometric sensor device for measuring the content of an oxygen reducible substance in a liquid, having in combination a sensor having a planar structure obtained by photolithograpic techniques and a circuit for measuring the intensity of the electrochemical current generated by said sensor, said structure comprising an insulating substrate a set of electrodes composed of at least one working electrode., one counter electrode and one reference electrode, at least said working electrode being disposed on said insulating substrate, said working electrode having an active surface only defined by a conductive part at the surface of said substrate, said device further comprising a diffusion membrane covering said conductive part of said working electrode While Overlapping the entire periphery of said conductive part, and connection means to connect said electrodes to said measuring circuit, said diffusion membrane, said reference electrode and said counter electrode being entirely exposed so that, when said device is functioning, they are in contact over their entire surfaces with the liquid to be analyzed.
Claim 3
Dependent Claim
47 words
An amperometric device according to claim 1, wherein said connection means includes at least one conductor connected to said working electrode and disposed on said insulating substrate at a level below the active surface of the working electrode and, extending beyond the periphery of said diffusion membrane.
Claim 4
Dependent Claim
16 words
An amperometric device according to claim 2, wherein the working electrode has a substantially circular shape.
Claim 5
Dependent Claim
26 words
An amperometric device according to claim 3, wherein said counter electrode and/or said reference electrode are arcuate in form and disposed concentrically about the working electrode.
Claim 6
Dependent Claim
16 words
An amperometric device according to claim 1, wherein the working electrode has a substantially circular shape.
Claim 7
Dependent Claim
26 words
An amperometric device according to claim 5, wherein said counter electrode and/or said reference electrode are arcuate in form and disposed concentrically about the working electrode.
Claim 8
Dependent Claim
47 words
An amperometric device according to claim 1, wherein said set of electrodes is surrounded by a packing fixed to said substrate and in that said connection means comprise liaison contacts with said measuring circuit situated outside the perimeter of said packing at the surface of said substrate.
Claim 9
Dependent Claim
34 words
An amperometric device according to claim 1, wherein said sensor is mounted on a printed circuit mounted in turn in a metal tube forming a casing and traversed by part of the connection means.
Claim 10
Dependent Claim
27 words
An amperometic device according to claim 1, wherein said sensor is disposed in a housing having the shape of a standardized DIL encapsulation housing for integrated circuits.
Claim 11
Dependent Claim
62 words
An amperometric device according to claim 1, further comprising a cylindrical tubular member having concentric inner and an outer tubes and two concentric channels respectively for communicating with one inlet and one outlet of the fluid to be analyzed, a packing and a support arranged to hold said tube abutting against said packing by one of the extremities of the outer tube.
Claim 12
Dependent Claim
44 words
An amperometric device according to claim 1, wherein said working electrode has several elements distributed on said substrate and in that said diffusion membrane has several elements covering respectively the elements of said working electrode by individually overlapping in relation to these electrode elements.
Claim 13
Dependent Claim
17 words
An amperometric device according to claim 1, wherein said working electrode has the shape of a comb.
References Cited (Backward Citations)
US3791953A
Cited
US4571292A
Cited
US4694834A
Cited
US4851088A
Cited
WO1988009500A1
Cited
EP0299780A2
Cited
EP0299779A2
Cited
EP0328640A1
Cited
US4948490A
Cited
US5120420A
Cited
US5120420B1
Cited
US5126034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-27 | 1998-08-29 | 1999-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-27 | 2002-08-29 | 2003-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-27 | 2006-08-29 | 2007-02-28 | $7700.00 | Window Closed / Lapsed |