CA2305980A1 - A method for cleaning electrodes in measuring equipment - Google Patents
A method for cleaning electrodes in measuring equipment Download PDFInfo
- Publication number
- CA2305980A1 CA2305980A1 CA 2305980 CA2305980A CA2305980A1 CA 2305980 A1 CA2305980 A1 CA 2305980A1 CA 2305980 CA2305980 CA 2305980 CA 2305980 A CA2305980 A CA 2305980A CA 2305980 A1 CA2305980 A1 CA 2305980A1
- Authority
- CA
- Canada
- Prior art keywords
- electrodes
- coating
- potential
- cleaning
- measuring equipment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/38—Cleaning of electrodes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Cleaning In General (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a method for cleaning electrodes, especially in measuring equipments. The electrodes, when carrying a coating, are exposed to a cleaning electric pulse having saw-tooth wave form and an initial potential of -1,5V, which, at a rate of 1 V/sec is reduced to 0 V and then immediately returned to -1,5V, said cycle being repeated a number of times sufficient to remove the coating, whereupon the electrodes are normalized by being brought to a final 0 V potential.
Description
' CA 02305980 2000-04-18 A method for cleaning electrodes in measuring equipment The present invention relates to a method for cleaning electrodes, especially in measuring equipments.
Most of the electromechanical measuring equipments or conductivity measuring equipments today available in the marketplace suffer from the great problem caused by deposited coatings. Their presence result in changes of the resistance of the electrodes and of their surface structure, which produces a drift in the measuring instruments used. In certain specific cases it is troublesome to clean the electrodes in voltammetric systems for measuring residual chemicals in bleacheries. In such environments organic substances, such as resins, are frequently present. It is especially difficult to remove resin coatings since they stick firmly to the electrode surface and get hard when exposed to lowering temperatures.
The prior art methods used to keep measurement electrodes free from inter alia resins include use of: vibrating electrodes, moved by excenters, choke coils operating at the measurement frequency, supersonic energy applied directly to the electrode, mechanical scrapers, planing or brushing the electrode, vapour or high pressure water flushing, a voltage of opposite polarity to that of the measuring voltage applied to the electrode. The one of those prior art methods which is most suitable for use in voltammetric equipments is the one last mentioned.
The object of the present invention is to provide a method for cleaning the electrodes in measuring equipments by use of a pulse application technique eliminating the shortcomings of the prior art methods. The features characterizing the invention are set out in the annexed claims.
Thanks to the invention it has now become possible to provide a method excellently satisfying its purpose and, at the same time, being very simple and cost-effective. More specifically, the new . ~ ' CA 02305980 2000-04-18 method involves use of a pulse applied repeatedly. When it is applied there is generated a mechanical impact on the electrode coating which is in that way efficiently removed. Consequently, the new method does not require use of any mechanical means which often complicates the apparatus used and makes it more expensive.
It has been established that the new method is capable of keeping the electrodes free from coatings, also in such severe environments as printing works and paper mills.
A preferred embodiment of the invention is described below.
In accordance with that example the method of the invention is carried out in the following manner in connection with the cleaning of electrodes in measuring equipments. The coatings on the electrodes are exposed to a saw-tooth pulse having the characteristics mentioned below. An initial potential of -1,5V
is caused to drop, at a rate of 1V/sec, to 0 V and is then, at the maximum rate available, returned to -1,5V. This cycle is then repeated as many times as required, typically 20-60 times, in order completely to remove the coating.
As mentioned above, the pulse is applied repeatedly. When reaching the electrode it triggers a mechanical impact on the coating, hydrogen gas also being released on the electrode surface. The process detaches the coating from the electrode surface and the gas pushes it away therefrom. In order to normalize the electrode,i.e. prevent polarization, the potential reverts to 0 V at a slower rate than that used for the generation of the pulse and the cycle is eventually concluded at zero potential.
Most of the electromechanical measuring equipments or conductivity measuring equipments today available in the marketplace suffer from the great problem caused by deposited coatings. Their presence result in changes of the resistance of the electrodes and of their surface structure, which produces a drift in the measuring instruments used. In certain specific cases it is troublesome to clean the electrodes in voltammetric systems for measuring residual chemicals in bleacheries. In such environments organic substances, such as resins, are frequently present. It is especially difficult to remove resin coatings since they stick firmly to the electrode surface and get hard when exposed to lowering temperatures.
The prior art methods used to keep measurement electrodes free from inter alia resins include use of: vibrating electrodes, moved by excenters, choke coils operating at the measurement frequency, supersonic energy applied directly to the electrode, mechanical scrapers, planing or brushing the electrode, vapour or high pressure water flushing, a voltage of opposite polarity to that of the measuring voltage applied to the electrode. The one of those prior art methods which is most suitable for use in voltammetric equipments is the one last mentioned.
The object of the present invention is to provide a method for cleaning the electrodes in measuring equipments by use of a pulse application technique eliminating the shortcomings of the prior art methods. The features characterizing the invention are set out in the annexed claims.
Thanks to the invention it has now become possible to provide a method excellently satisfying its purpose and, at the same time, being very simple and cost-effective. More specifically, the new . ~ ' CA 02305980 2000-04-18 method involves use of a pulse applied repeatedly. When it is applied there is generated a mechanical impact on the electrode coating which is in that way efficiently removed. Consequently, the new method does not require use of any mechanical means which often complicates the apparatus used and makes it more expensive.
It has been established that the new method is capable of keeping the electrodes free from coatings, also in such severe environments as printing works and paper mills.
A preferred embodiment of the invention is described below.
In accordance with that example the method of the invention is carried out in the following manner in connection with the cleaning of electrodes in measuring equipments. The coatings on the electrodes are exposed to a saw-tooth pulse having the characteristics mentioned below. An initial potential of -1,5V
is caused to drop, at a rate of 1V/sec, to 0 V and is then, at the maximum rate available, returned to -1,5V. This cycle is then repeated as many times as required, typically 20-60 times, in order completely to remove the coating.
As mentioned above, the pulse is applied repeatedly. When reaching the electrode it triggers a mechanical impact on the coating, hydrogen gas also being released on the electrode surface. The process detaches the coating from the electrode surface and the gas pushes it away therefrom. In order to normalize the electrode,i.e. prevent polarization, the potential reverts to 0 V at a slower rate than that used for the generation of the pulse and the cycle is eventually concluded at zero potential.
Claims (2)
1. A method for cleaning electrodes, particularly in measuring equipments, characterized in that the electrodes, carrying a coating, are exposed to a cleaning electric pulse having a saw-tooth wave form and an initial potential of -1,5V
which, at a rate of 1 V/sec, assumes the value of 0 V, from which it rapidly reverts to -1,5V, said cycle being repeated a number of times sufficient to remove the coating, whereupon the electrodes are normalized by reduction of the potential to 0 V
as the final potential value.
which, at a rate of 1 V/sec, assumes the value of 0 V, from which it rapidly reverts to -1,5V, said cycle being repeated a number of times sufficient to remove the coating, whereupon the electrodes are normalized by reduction of the potential to 0 V
as the final potential value.
2. A method according to claim 1, characterized in that the potential is varied between its values about 20-60 times, as determined by the type of the coating.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9901446A SE9901446L (en) | 1999-04-22 | 1999-04-22 | Method for cleaning electrodes in measuring equipment |
| SE9901446-6 | 1999-04-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2305980A1 true CA2305980A1 (en) | 2000-10-22 |
Family
ID=20415317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2305980 Abandoned CA2305980A1 (en) | 1999-04-22 | 2000-04-18 | A method for cleaning electrodes in measuring equipment |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2001025717A (en) |
| CA (1) | CA2305980A1 (en) |
| FI (1) | FI20000965A (en) |
| FR (1) | FR2792726A1 (en) |
| SE (1) | SE9901446L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107110809A (en) * | 2014-11-10 | 2017-08-29 | 卡勒拉公司 | ion concentration measurement in the presence of organic matter |
| US10844496B2 (en) | 2015-10-28 | 2020-11-24 | Calera Corporation | Electrochemical, halogenation, and oxyhalogenation systems and methods |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6960466B2 (en) | 2001-05-31 | 2005-11-01 | Instrumentation Laboratory Company | Composite membrane containing a cross-linked enzyme matrix for a biosensor |
| US6872297B2 (en) * | 2001-05-31 | 2005-03-29 | Instrumentation Laboratory Company | Analytical instruments, biosensors and methods thereof |
| US6652720B1 (en) | 2001-05-31 | 2003-11-25 | Instrumentation Laboratory Company | Analytical instruments, biosensors and methods thereof |
| WO2004053483A2 (en) | 2002-12-11 | 2004-06-24 | Instrumentation Laboratory Company | Multi-analyte reference solutions |
| DE10309022A1 (en) * | 2003-03-01 | 2004-09-09 | Dr. A. Kuntze Gmbh | Process for cleaning electrode surfaces and device for carrying out the process |
| FR2858414B1 (en) * | 2003-07-29 | 2008-02-08 | Centre Nat Machinisme Agricole | METHOD FOR ACTIVATION-REGENERATION OF A REDOX SENSOR IN A PURIFICATION STATION |
-
1999
- 1999-04-22 SE SE9901446A patent/SE9901446L/en not_active IP Right Cessation
-
2000
- 2000-04-14 FR FR0004816A patent/FR2792726A1/en active Pending
- 2000-04-18 CA CA 2305980 patent/CA2305980A1/en not_active Abandoned
- 2000-04-19 JP JP2000117816A patent/JP2001025717A/en not_active Withdrawn
- 2000-04-25 FI FI20000965A patent/FI20000965A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107110809A (en) * | 2014-11-10 | 2017-08-29 | 卡勒拉公司 | ion concentration measurement in the presence of organic matter |
| US10844496B2 (en) | 2015-10-28 | 2020-11-24 | Calera Corporation | Electrochemical, halogenation, and oxyhalogenation systems and methods |
Also Published As
| Publication number | Publication date |
|---|---|
| FI20000965A0 (en) | 2000-04-25 |
| FI20000965A (en) | 2000-10-22 |
| SE512534C2 (en) | 2000-03-27 |
| JP2001025717A (en) | 2001-01-30 |
| FR2792726A1 (en) | 2000-10-27 |
| SE9901446L (en) | 2000-03-27 |
| SE9901446D0 (en) | 1999-04-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |