CN87201222U - Dissolved oxygen transducer - Google Patents
Dissolved oxygen transducer Download PDFInfo
- Publication number
- CN87201222U CN87201222U CN 87201222 CN87201222U CN87201222U CN 87201222 U CN87201222 U CN 87201222U CN 87201222 CN87201222 CN 87201222 CN 87201222 U CN87201222 U CN 87201222U CN 87201222 U CN87201222 U CN 87201222U
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- utility
- dissolved oxygen
- model
- negative electrode
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Abstract
The utility model relates to a dissolved oxygen sensor which is used for measuring oxygen in water. The utility model improves a flowing coulomb oxygen sensor and provides a stirring shape complex membrane dissolved oxygen sensor which is provided with a small-size of double working cathode, a stirring rod and a measuring container. The utility model has the advantages of saving noble metal material, higher sensitivity, quick response, good reproducibility, high precision, long service life, small size and strong applicability, etc. The utility model is suitable for in-place measurement in labs and various harsh environment of fields, and is widely used for the inwater dissolved oxygen measurement in sea water, tap water, environmental water and polluted water.
Description
The utility model belongs to lambda sensor.
Dissolved oxygen sensor also claims dissolved oxygen electrode, is used for Determination of DO, existing polytype, but generally all adopt clarke (Clark) lambda sensor of two electrode structures or the lambda sensor of galvanic cell type.
Department of chemistry of Xiamen University has proposed SY type lambda sensor and oxygen analyser (seeing " Xiamen University's journal " (natural science edition) 19(1980) 54-63 and the 22(1983 of storehouse, mobile storehouse type) 499-505).
Its corresponding lambda sensor comprises two work negative electrodes and contrast electrode.The first work negative electrode is the garden plate-like, proof gold garden sheet; The second work negative electrode is the garden ring-type, and the back side keeps flat a slice garden annular anion-exchange membrane.Inner chamber is filled with 0.5M KCl+0.02M Na
2B
4O
7+ 2% agar is as electrolyte.
The lambda sensor of storehouse, above-mentioned mobile storehouse type has limited the phase counterdiffusion of oxygen in the inside and outside electrolyte solution in chamber and has disturbed because the second work negative electrode is positioned on the slype of the first work negative electrode and contrast electrode.The second work negative electrode in use adds constant decomposition voltage all the time, has overcome the influence of " edge effect " effectively, has improved analytical accuracy.The diaphragm of the second work cathode back stops the Trace Ag of contrast electrode stripping
+Be diffused on the negative electrode and reduce, avoid the contaminated electrode surface that sensor performance is progressively changed and lost efficacy, and can (produce OH after the hydrogen reduction by negative ion
-) reach electrobalance, so, make electrode potential stable, prolong serviceable life.
The purpose of this utility model is the improvement to storehouse, above-mentioned mobile storehouse type lambda sensor, a kind of electrode area and cavity volume of reducing proposed, be furnished with stirring system and airtight mensuration container, performance is further improved, the multiple film dissolved oxygen sensor of the small-sized agitating type that applicability is wide.
Dissolved oxygen sensor after the improvement is still established two work negative electrode K
1, K
2, a contrast electrode (anode) A, other is provided with stirring system and airtight mensuration container, at K
1And K
2The surface add a layer electrode membrane.K
2Be the garden dish type, diameter r
1Be 1mm＜r
1＜6mm; K
2Be the garden annular, internal diameter r
2Be 2mm＜r
2＜7mm.External diameter r
3Be 5mm＜r
3＜13mm.K
1And K
2Thickness d be 0.5mm＜d＜1mm, material is proof gold.In sensor cavity, be filled with electrolyte.K
2Be positioned at K
1On the slype of A, the phase counterdiffusion of oxygen is disturbed in the inside and outside electrolyte of restricted room better, reduces the disturbing factor of dissolved oxygen DO.The cavity volume V of sensor is 2ml＜V＜4ml.Overcome the influence of " edge effect " so effectively, improved the accuracy of measuring.Electrolyte adopts 0.5M KCl+0.02M Na
2B
4O
7+ 2% agar is the frozen glue state, can reduce the influence of environment mechanical shock, also contrast electrode is shielded, and is adapted to field condition and uses.
At K
2The back side one deck anion-exchange membrane is arranged.In addition at K
1And K
2The surface add the semi-transparent electrode film of last layer gas, shield, stop the pollution of determined water sample impurity, prolong electrode life.Require the good permeability of electrode film, acid-alkali-corrosive-resisting is for example selected polyethylene film or teflon etc. for use.
K
1Adopt plane formula garden dish type or mushroom hair style garden dish type, the former electrode film difficulty installs, and is often gapped; The latter's electrode film can increase the adhesion of electrode film near electrode, has improved response speed, as shown in Figure 1.
The utility model is furnished with stirring system, and stirring system comprises small machine and stirring rod etc.Owing to the effect of stirring, shortened the time of environmental balance.
In above-mentioned SY type lambda sensor, not disturbed in order to make water sample chamber and atmospheric isolation, adopt water sample to flow into the closed electrode chamber automatically, the general little water pump of adapted, more existing its sensitivity of agitating type lambda sensor are lower.The utility model adopts special-purpose airtight mensuration container and the close-fitting measure of dissolved oxygen sensor, so that water sample and atmosphere contacts in the isolated mensuration process.The opening of this container and the housing contacts of sensor are identical, tight, and material and size do not have strict restriction.
The utility model is owing to reduced the area of first and second work negative electrode, dwindle the cavity volume of sensor, adapted stirring system and airtight mensuration container are not only saved precious metal, and have further improved the performance of lambda sensor, it is higher to make it to have sensitivity, response is fast, favorable reproducibility, and zero wafts and temperature is waftd little, stable performance, accuracy are than characteristics such as height, and its main performance reaches: oxygen determination scope: 0～14ml-02/1 or 0～20.0mg/l.
Oxygen determination precision: ± 0.01ml-02/1 or ± 0.014mg/l.
Temperature compensation range: (10 ℃～30 ℃) ± 10 ℃.
Normal working temperature scope: 10 ℃～35 ℃.
Deviations in accuracy :≤± 0.10ml-02/1 or ± 0.14mg/l.
Response time :≤30sec.
Height-hypoxemia conversion error at measurment (the airtight mensuration container of adapted) :≤± 1～1.2%(instrument of the same type is up to ± 20～25%).
Table 1 provides the ratio of SY type lambda sensor and domestic and international similar lambda sensor and surveys the result.
Table 2 provides lambda sensor described in the utility model and surveys the result with the ratio of SY type lambda sensor.
The precision that table 3 provides lambda sensor described in the utility model and SY type lambda sensor mensuration seawater sample compares.
The precision that table 4 provides lambda sensor described in the utility model and SY type lambda sensor mensuration pond water sample compares.
In addition, owing to adopt multiple film measure, thereby avoided electrode surface to be polluted, change electrode film in good time, prolonged the serviceable life of electrode.
The utility model is small-sized easy, is easy to grasp, use, and both has been applicable to the laboratory, also is applicable to the on-site measurement of open-air various rugged surroundings.The oxygen in water that can be widely used in seawater, tap water, Environmental Water and sewage is measured, especially the determination of sewage in aquaculture and the environmental protection.
Fig. 1 compares the response time of plane formula garden dish type first work negative electrode and the mushroom hair style garden dish type first work negative electrode.
Fig. 2 is the dissolved oxygen sensor structural drawing.
Fig. 3 is first and second work negative electrode cut-open view.
Fig. 4 is the dissolved oxygen sensor outside drawing.
K among the figure
1Be the first work negative electrode, K
2Be the second work negative electrode, A is Ag/Agcl contrast electrode (anode), and (1) is contact conductor, and (2) are sensor outer housing, and (3) are electrolyte, and (4) are sensor cap, and (5) for stirring small machine, (6) are motor down-lead, and (7) are stirring rod.
Below provide embodiment of the present utility model.
The utility model all adopts twin cathode, and material is with 99.99% proof gold, and contrast electrode plates Agce in advance with 99.9 filamentary silver.Fill up 0.5M Kcl+0.02M Na in the chamber
2B
4O
7+ 2% agaropectin is the frozen glue state as electrolyte.Electrode film is a polyethylene film, and thickness is 10 μ m.The sensor outer housing organic glass.Small machine is selected the electronics speed-stable DC motor for use, and (6～12V), the material of stirring rod is with stainless steel, teflon, silicone tube.The size of negative electrode, shape, thickness see Table 5.
Table 1
Table 2
Table 4
Unit: mm
Claims (2)
1, a kind of dissolved oxygen sensor has the work negative electrode, K
1, K
2, contrast electrode (anode) A, stirring system, the sensor inner chamber is filled with electrolyte, K
2There is anion-exchange membrane at the back side, it is characterized in that:
A), the first work negative electrode K
1Diameter r
1Be 1mm＜r
1＜6mm, the second work negative electrode K
2Internal diameter r
2Be 2mm＜r
2＜7mm, external diameter r
3Be 5mm＜r
3＜13mm, the thickness d of first and second work negative electrode is 0.5mm＜d＜1mm;
B), the cavity volume V of sensor is 2ml＜V＜4ml;
C), at first and second work negative electrode K
1, K
2The surface add upper electrode film.
2, sensor as claimed in claim 1 is characterized in that first work negative electrode plane formula garden dish type or the mushroom hair style garden dish type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87201222 CN87201222U (en) | 1987-04-04 | 1987-04-04 | Dissolved oxygen transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87201222 CN87201222U (en) | 1987-04-04 | 1987-04-04 | Dissolved oxygen transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87201222U true CN87201222U (en) | 1988-01-20 |
Family
ID=4817549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87201222 Withdrawn CN87201222U (en) | 1987-04-04 | 1987-04-04 | Dissolved oxygen transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87201222U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306265C (en) * | 2002-02-05 | 2007-03-21 | 京瓷株式会社 | Oxygen sensor |
| 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 |
| CN102435646A (en) * | 2011-09-09 | 2012-05-02 | 大连赛恩仪表股份有限公司 | Hand-held trace dissolved oxygen analytic instrument with charging base and flow detection pool |
| CN104614418A (en) * | 2013-04-28 | 2015-05-13 | 天和自动化科技（苏州）股份有限公司 | Enclosed dissolved oxygen sensor |
| CN104614419A (en) * | 2013-04-28 | 2015-05-13 | 天和自动化科技（苏州）股份有限公司 | High precision dissolved oxygen detector |
| CN104698045A (en) * | 2013-04-28 | 2015-06-10 | 天和自动化科技（苏州）股份有限公司 | Dissolved oxygen (DO) electrochemical sensor |
| CN104698049A (en) * | 2013-04-28 | 2015-06-10 | 天和自动化科技（苏州）股份有限公司 | Environment-friendly dissolve oxygen (DO) sensor |
| CN104990970A (en) * | 2015-06-24 | 2015-10-21 | 中山欧麦克仪器设备有限公司 | Dissolved oxygen sensor with automatic temperature compensating |
-
1987
- 1987-04-04 CN CN 87201222 patent/CN87201222U/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306265C (en) * | 2002-02-05 | 2007-03-21 | 京瓷株式会社 | Oxygen sensor |
| 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 |
| CN102435646A (en) * | 2011-09-09 | 2012-05-02 | 大连赛恩仪表股份有限公司 | Hand-held trace dissolved oxygen analytic instrument with charging base and flow detection pool |
| CN104614418A (en) * | 2013-04-28 | 2015-05-13 | 天和自动化科技（苏州）股份有限公司 | Enclosed dissolved oxygen sensor |
| CN104614419A (en) * | 2013-04-28 | 2015-05-13 | 天和自动化科技（苏州）股份有限公司 | High precision dissolved oxygen detector |
| CN104698045A (en) * | 2013-04-28 | 2015-06-10 | 天和自动化科技（苏州）股份有限公司 | Dissolved oxygen (DO) electrochemical sensor |
| CN104698049A (en) * | 2013-04-28 | 2015-06-10 | 天和自动化科技（苏州）股份有限公司 | Environment-friendly dissolve oxygen (DO) sensor |
| CN104990970A (en) * | 2015-06-24 | 2015-10-21 | 中山欧麦克仪器设备有限公司 | Dissolved oxygen sensor with automatic temperature compensating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |