CN2857003Y - Electrochemical senser for trace dissolved oxygen - Google Patents
Electrochemical senser for trace dissolved oxygen Download PDFInfo
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- CN2857003Y CN2857003Y CN 200520029538 CN200520029538U CN2857003Y CN 2857003 Y CN2857003 Y CN 2857003Y CN 200520029538 CN200520029538 CN 200520029538 CN 200520029538 U CN200520029538 U CN 200520029538U CN 2857003 Y CN2857003 Y CN 2857003Y
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Abstract
An electrochemical sensor for trace amount dissolved oxygen comprises a housing, an anode electrode, a cathodic electrode, electrolyte and an oxygen permeability membrane, and is characterized in that: the anode electrode is a circular pipe and is provided with a fixing seat, which is built in the upper end of the housing, at the upper end and with a connector, which is built in the lower end of the housing, at the lower end; the cathodic electrode is arranged at the head of the connector and contacts, at the inner surface, with a temperature sensor arranged inside of the connector; the anode electrode, the cathodic electrode and the leads of temperature sensor are respectively fixed on the fixing seat, the anode electrode and the core of the connector; the electrolyte cavity is positioned between the anode electrode and the housing; the oxygen permeability membrane is arranged at the lower end of the housing and contacts, at the inner surface, with the cathodic electrode and the closed electrolyte. The cathodic electrode is made of passive metal material with a purity of not less than 99.9999%. The working surface of the cathodic electrode is circular with a diameter of 2-8 mm. The electrochemical sensor has the advantages of that: the sensitivity is high, the output current has a strong signal, the interference resistance capability is strong, the output is stabile, and the sensor is suitable to industrialization and suitable to the measuring of trace amount dissolved oxygen.
Description
Technical field
The utility model relates to electrochemical field, is a kind of trace dissolving oxygen electrochemical sensor.
Background technology
The detection of trace dissolving oxygen is usually used in the detection of special water quality, for example: the boiler feed water of fuel-burning power plant, nuclear power plant is desalination, deaerated water, and the content of dissolved oxygen DO otherwise can quicken the oxidation corrosion of pot wall generally below 7 μ g/L.The electric signal that the dissolved oxygen DO of low content like this produces in sensor is very faint, is generally 10
10A.
Existing common dissolved oxygen electrochemical sensor major defect is: though negative electrode also adopts inert metal materials such as gold, but the purity of material is not enough, other contained metallic impurity can carry out electrochemical reaction with anode in electrolytic solution, form the additional interference electric current, this interference current is when trace detection even greater than watt current; The working area of negative electrode is too little, and general diameter is between 0.3mm～1.0mm, and therefore the electric signal that redox reaction produces when trace detection is extremely faint; Insulator between negative electrode and the anode is a glass, and the insulation degree in electrolytic solution descends, and causes electric leakage, and this electric leakage influences when other dissolved oxygen sensing of mg/L level and can ignore, but can fall into oblivion useful signal when trace measurement.Existing common dissolved oxygen electrochemical sensor is only applicable to the detection of surface water owing to material therefor and structural restriction, and its content is the mg/L rank, and when being used for the super low loading detection reluctantly, error is very big and unstable.
The utility model content
The purpose of this utility model is that prior art is carried out substantial improvements, provide a kind of those skilled in the art to thirst for solving but achieving success as yet always, highly sensitive, output current signal is strong, antijamming capability is strong, output is stable, is fit to the trace dissolving oxygen electrochemical sensor of suitability for industrialized production.
The purpose of this utility model is realized by following technical scheme: a kind of trace dissolving oxygen electrochemical sensor, it comprises housing, anode electrode, cathode electrode, the electrolytic solution cavity volume, electrolytic solution, oxygen permeation membrane, it is characterized in that: anode electrode is a pipe, on the pipe anode electrode, the lower end is placed on the housing respectively, the holder that the lower end is built-in, on the connector, cathode electrode places the head end of connector, in connector, be provided with and the contacted temperature sensor of cathode electrode inside surface, with the pipe anode electrode, cathode electrode, the lead that temperature sensor connects is fixed in holder, the core of pipe anode electrode and connector, the electrolytic solution cavity volume is arranged between pipe anode electrode and the housing, oxygen permeation membrane is contained in the housing lower end by the film cap, and the inside surface of oxygen permeation membrane contacts with cathode electrode working surface and the electrolytic solution that is closed in the electrolytic solution cavity volume.Described cathode electrode is a kind of inert metal material in gold, platinum, palladium, ruthenium, the iridium, its purity 〉=99.9999%.Described cathode electrode working surface is circular, its diameter 2～8mm.Described connector, holder and housing adopt high insulation engineering plastics.
The advantage applies of trace dissolving oxygen electrochemical sensor of the present utility model exists:
1. because cathode electrode adopts inert metal materials such as gold or platinum, and purity 〉=99.9999%, make its stable performance in redox reaction, the interference of the reaction of avoiding mixing has strengthened interference free performance;
2. because the working area of cathode electrode is big, its diameter 2～8mm, sensor highly sensitive, output current signal is strong, and is directly proportional with the content of dissolved oxygen DO, has reduced the requirement to circuit in the measuring instrument, has improved the antijamming capability of detection system;
3. because connector, holder and housing adopt high insulation engineering plastics to make, good insulation preformance between cathode electrode and the anode electrode, leakage of current is bordering on zero under condition of work, the measurement that makes sensor satisfy the dissolved oxygen DO of trace level becomes possibility, can satisfy the measurement requirement of dissolved oxygen DO 1～200 μ g/L content.
4. be quick on the draw, output is stable;
5. be fit to suitability for industrialized production.
Description of drawings
Fig. 1 is the structure cross-sectional schematic of trace dissolving oxygen electrochemical sensor.
Among the figure: 1,2,3 leads, 4 loam cakes, 5 holders, 6 housings, 7 electrolytic solution cavity volumes, 8 filling materials, 9 anode electrodes, 10 connectors, 11 film caps, 12 temperature sensors, 13 cathode electrodes, 14 oxygen permeation membranes.
Embodiment
Utilize embodiment shown in the drawings that the utility model is further described below.
With reference to Fig. 1, trace dissolving oxygen electrochemical sensor has housing 6, anode electrode 9, cathode electrode 13, electrolytic solution cavity volume 7, electrolytic solution, oxygen permeation membrane 14, temperature sensor 12.Anode electrode 9 is a pipe, and pipe anode electrode 9 of the present utility model adopts thin-walled silver pipe, and its purity 〉=99.999% is good, and the worksheet area of pipe anode electrode 9 is about 45～60 times of cathodic surface area.The upper and lower end of pipe anode electrode 9 is placed on respectively on the built-in holder 5 of housing 6 upper and lower ends, the connector 10, is connected with housing 6 with loam cake 4 holder 5 is press-fited in the upper end of housing 6.Cathode electrode 13 is a kind of inert metal material in gold, platinum, palladium, ruthenium, the iridium, and its purity 〉=99.9999%, the working surface of cathode electrode 13 are circular, its diameter 2～8mm.Cathode electrode 13 places the head end of connector 10, be provided with in connector 10 and the contacted temperature sensor 12 of cathode electrode 13 inside surfaces, lead 2,3, the 1 usefulness filling material 8 that is connected with pipe anode electrode 9, cathode electrode 13, temperature sensor 12 is fixed in the core of holder 5, pipe anode electrode 9 and connector 10.Electrolytic solution cavity volume 7 is arranged between pipe anode electrode 9 and the housing 6, and oxygen permeation membrane 14 is contained in housing 6 lower ends by film cap 11, and the inside surface of oxygen permeation membrane 14 contacts with cathode electrode 13 working surfaces and the electrolytic solution that is closed in the electrolytic solution cavity volume 7.Connector 10, holder 5 and housing 6 adopt Noryl or the contour insulation engineering plastics of ABS.Filling material 8 adopts high insulation rapid solidification glue; Temperature sensor 12 adopts the NTC temperature sensor; Electrolytic solution adopts potassium chloride electrolytic solution; Oxygen permeation membrane 14 adopts fluorine plastic film, and its thickness is that 0.02～0.04mm is advisable.High insulation rapid solidification glue, NTC temperature sensor, potassium chloride electrolytic solution, oxygen permeation membrane are the commercially available prod.
During work: the oxygen permeation membrane 14 of trace dissolving oxygen electrochemical sensor places airtight flow path system, and detected water flows through oxygen permeation membrane 14 outside surfaces.Add between anode electrode 9 and cathode electrode 13+DC voltage of (0.75～0.85) V, detect the current in loop size, its size is directly proportional with dissolved oxygen content.The lead 2,3,1 of anode electrode 9, cathode electrode 13, temperature sensor 12 is connected with measuring instrument.
Claims (4)
1. trace dissolving oxygen electrochemical sensor, it comprises housing, anode electrode, cathode electrode, the electrolytic solution cavity volume, electrolytic solution, oxygen permeation membrane, it is characterized in that: anode electrode is a pipe, on the pipe anode electrode, the lower end is placed on the housing respectively, the holder that the lower end is built-in, on the connector, cathode electrode places the head end of connector, in connector, be provided with and the contacted temperature sensor of cathode electrode inside surface, with the pipe anode electrode, cathode electrode, the lead that temperature sensor connects is fixed in holder, the core of pipe anode electrode and connector, electrolytic solution cavity volume are arranged between pipe anode electrode and the housing, oxygen permeation membrane is contained in the housing lower end by the film cap, and the inside surface of oxygen permeation membrane contacts with cathode electrode working surface and the electrolytic solution that is closed in the electrolytic solution cavity volume.
2. trace dissolving oxygen electrochemical sensor according to claim 1 is characterized in that: described cathode electrode is a kind of inert metal material in gold, platinum, palladium, ruthenium, the iridium, its purity 〉=99.9999%.
3. trace dissolving oxygen electrochemical sensor according to claim 1 is characterized in that: described cathode electrode working surface is circle, its diameter 2～8mm.
4. trace dissolving oxygen electrochemical sensor according to claim 1 is characterized in that: described connector, holder and housing adopt high insulation engineering plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520029538 CN2857003Y (en) | 2005-12-10 | 2005-12-10 | Electrochemical senser for trace dissolved oxygen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520029538 CN2857003Y (en) | 2005-12-10 | 2005-12-10 | Electrochemical senser for trace dissolved oxygen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2857003Y true CN2857003Y (en) | 2007-01-10 |
Family
ID=37600307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520029538 Expired - Fee Related CN2857003Y (en) | 2005-12-10 | 2005-12-10 | Electrochemical senser for trace dissolved oxygen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2857003Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401052C (en) * | 2005-12-10 | 2008-07-09 | 吉林市恒诚电力设备有限责任公司 | Trace dissolving oxygen electrochemical sensor |
| CN103134842A (en) * | 2011-11-30 | 2013-06-05 | 李益峰 | Dissolved oxygen sensor |
| CN104049013A (en) * | 2014-07-08 | 2014-09-17 | 中农上润（福建）智能装备有限公司 | Water quality detection electrode capable of automatically exchanging membrane |
-
2005
- 2005-12-10 CN CN 200520029538 patent/CN2857003Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100401052C (en) * | 2005-12-10 | 2008-07-09 | 吉林市恒诚电力设备有限责任公司 | Trace dissolving oxygen electrochemical sensor |
| CN103134842A (en) * | 2011-11-30 | 2013-06-05 | 李益峰 | Dissolved oxygen sensor |
| CN104049013A (en) * | 2014-07-08 | 2014-09-17 | 中农上润（福建）智能装备有限公司 | Water quality detection electrode capable of automatically exchanging membrane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070110 Termination date: 20100111 |