EP0039136A2
Expired / Lapsed
EP
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Electrode device, method for its preparation, and dispersion useful in the method
Assignee: Radiometer AS
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Filing: 1981-03-26
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Granted: —
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Expires: 2001-03-26
Abstract
Abstract An electrode device for electrochemical measurement of the concentration of the partial pressure of a gas in a liquid or a gas mixture; comprises a measuring surface constituted by or comprising the sensitive part (4) of a measuring electrode and a membrane (6). placed in front of the measuring surface and delimiting a volume of electrolyte solution (5) which is in contact with the measuring electrode. The membrane is permeable to thegas to be determined, and a given distance is obtained and maintained between the measuring surface and the membrane by means of particles (7). When assembling the electrode device, a dispersion of the particles in the electrolyte to be incorporated in the electrode device is applied on the measuring surface and/or the membrane in excess, and the electrode device is assembled, whereby excess dispersion is pressed out. The dispersion of the particles in the electrolyte is gelled so that it is stable. By using particles for obtaining and maintaining the distance between the measuring surface and the membrane, it is possible to obtain very small distances between the measuring surface and the membrane, and the thickness of thin electrolyte layers is easy to control using particles, thus reducing the response time of the electrode. Furthermore, the thickness of the electrolyte layer is adjusted automatically when assembling the electrode device and the membrane between which a dispersion of particles is placed.
Inventors
- 👤 Jorgen Poulsen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 10:25
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/1468; A61B5/1477; A61B5/1491; G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/416; G01N27/4162
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
107 words
An electrode device for electrochemical measurement of the concentration or the partial pressure of a gas in a liquid or a gas mixture and comprising a measuring surface constituted by or comprising the sensitive part of a measuring electrode and a membrane which is placed in front of the measuring surface and limits a volume of an electrolyte solution which is in contact with the measuring electrode, said membrane being permeable to the gas species to be determined, said electrode device comprising essentially non-compressible particles between the measuring surface and the membrane in a sufficient amount to keep the membrane in a distance from the measuring surface.
Claim 2
Dependent Claim
107 words
An electrode device for electrochemical measurement of the concentration or the partial pressure of a gas in a liquid or a gas mixture and comprising a measuring surface constituted by or comprising the sensitive part of a measuring electrode and a membrane which is placed in front of the measuring surface and limits a volume of an electrolyte solution which is in contact with the measuring electrode, said membrane being permeable to the gas species to be determined, said electrode device comprising essentially non-compressible particles between the measuring surface and the membrane in a sufficient amount to keep the membrane in a distance from the measuring surface.
Claim 3
Dependent Claim
19 words
An electrode device according to claim 1, wherein the particles are in a monolayer and have approximately spherical form.
Claim 4
Dependent Claim
23 words
An electrode device according to claim 2, wherein the particles are particles of abrasives, especially of carborundum, or spheres of polymer or glass.
Claim 5
Dependent Claim
48 words
An electrode device according to any of the claims 1 - 3, wherein the particles have a size in the range of 2 - 50 microns, preferably a size in the range of 2 - 30 microns, especially a size in the range of 2 - 20 microns.
Claim 6
Dependent Claim
27 words
An electrode device according to any of the claims 1 - 4, wherein the thickness of the membrane is in the range of 12 - 30 microns.
Claim 7
Dependent Claim
24 words
An electrode device according to any of the claims 1 - 5, wherein the measuring electrode is a glass electrode or a platinum electrode.
Claim 8
Dependent Claim
150 words
A process for preparing an electrode device for electrochemical measurement of the partial pressure of a gas in a liquid or a gas mixture, said electrode device comprising a measuring surface constituted by or comprising the sensitive part of a measuring electrode and a membrane which is placed in front of the measuring surface and which. limits a volume of an electrolyte solution which is in contact with the measuring electrode, said membrane being permeable to the gas to be determined, comprising applying a dispersion of essentially non-compressible particles in the electrolyte solution which is to be used in the electrode device to the measuring surface and/or the membrane in an excess, and mounting the membrane on the electrode device in such a manner that excess dispersion is pressed out so that the particles in the form of a monolayer make contact with both the measuring surface and the membrane.
Claim 9
Dependent Claim
150 words
A process for preparing an electrode device for electrochemical measurement of the partial pressure of a gas in a liquid or a gas mixture, said electrode device comprising a measuring surface constituted by or comprising the sensitive part of a measuring electrode and a membrane which is placed in front of the measuring surface and which. limits a volume of an electrolyte solution which is in contact with the measuring electrode, said membrane being permeable to the gas to be determined, comprising applying a dispersion of essentially non-compressible particles in the electrolyte solution which is to be used in the electrode device to the measuring surface and/or the membrane in an excess, and mounting the membrane on the electrode device in such a manner that excess dispersion is pressed out so that the particles in the form of a monolayer make contact with both the measuring surface and the membrane.
Claim 10
Dependent Claim
19 words
A process according to claim 7, wherein the dispersion is gelled to such an extent that it is stable.
Claim 11
Dependent Claim
35 words
A process according to claim 8, wherein the dispersion is gelled using a thickening agent such as carboxymethyl cellulose, preferably in an amount of about 3%, or agarose, preferably in an amount of about 0.4%.
Claim 12
Dependent Claim
74 words
A dispersion of essentially non-compressible particles in an electrolyte, said dispersion being a monodisperse dispersion of particles having a particle size in the range of 2 - 50 microns in an electrolyte solution. which, with respect to its qualitative and quantitative composition, is suitable for being used as an electrolyte in a membrane-covered electrode device for polarographic or potentiometric determination of the partial pressure of a gas in a liquid or a gas mixture.
Claim 13
Dependent Claim
74 words
A dispersion of essentially non-compressible particles in an electrolyte, said dispersion being a monodisperse dispersion of particles having a particle size in the range of 2 - 50 microns in an electrolyte solution. which, with respect to its qualitative and quantitative composition, is suitable for being used as an electrolyte in a membrane-covered electrode device for polarographic or potentiometric determination of the partial pressure of a gas in a liquid or a gas mixture.
Claim 14
Dependent Claim
13 words
A dispersion according to claim 10, wherein the electrolyte solution contains a pH-buffer.
Claim 15
Dependent Claim
27 words
A dispersion according to claim 10 or 11, wherein the particles are particles of an abrasive, glass or polymer, preferably particles of an abrasive, especially of carborundum.
Claim 16
Dependent Claim
20 words
A dispersion according to claim 12, wherein the particles have a size in the range of 2 - 20 microns.
Claim 17
Dependent Claim
46 words
A dispersion according to claim 12 or 13 comprising carborundum particles having a size of about 3 microns in an amount of about 3 percent by weight or carborundum particles having a size of about 10 microns in an amount of about 5 percent by weight.
Claim 18
Dependent Claim
38 words
A dispersion according to any of the claims 11 - 14 which is gelled with a thickening agent such as carboxymethyl cellulose, preferably in an amount of about 3%, or agarose, preferably in an amount of about 0.4%.
References Cited (Backward Citations)
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