CN2599575Y - Closed dissolved-oxygen sensor - Google Patents
Closed dissolved-oxygen sensor Download PDFInfo
- Publication number
- CN2599575Y CN2599575Y CNU022916776U CN02291677U CN2599575Y CN 2599575 Y CN2599575 Y CN 2599575Y CN U022916776 U CNU022916776 U CN U022916776U CN 02291677 U CN02291677 U CN 02291677U CN 2599575 Y CN2599575 Y CN 2599575Y
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- bracing frame
- dissolved oxygen
- sensing probe
- oxygen sensor
- groove
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Abstract
A closed dissolved oxygen sensor comprises a sensitive probe and a sensor body, which is applied in a marine station, a buoy and other continuously working marine sites. An external shell of the sensitive probe is with the shape of an inverted cylinder. Four small semicircular postholes are evenly distributed in an internal wall of a round hole at the center of a top end of the external shell. The top end of the external shell together with an umbrella surface of an electrode supporting frame basically enclose a ion passage, so ions exchange with each other just through the four small semicircular post holes, which restricts the dissolved oxygen in the water from diffusing into the electrolyte of a electrode cavity and guarantees the long-term continuous working capability of the sensor. A wafer-shaped cathode is embedded in a groove of umbrella surface of the bearing frame, and a cathode lead wire goes through a small central hole of the groove and a hollow umbrella handle of the supporting frame. A cylindrical anode fits into the umbrella handle, and an anode lead wire leads downwards from an external side of the umbrella handle. The cathode lead wire and the anode lead wire go through a cylindrical electrode pedestal respectively and are connected with a circuit board inside the sensor body.
Description
Technical field
The utility model is the sensor of dissolved oxygen DO in the various water quality environments such as a kind of in-site measurement seawater, belongs to the surveying instrument technical field.
Background technology
Dissolved oxygen DO is the important factor of marine ecology physicochemical environment in the seawater, has influence on the variation of the halobiontic existence and the marine eco-environment.Dissolved oxygen DO is all significant for the research and the application of thalassochemistry, marine biology and marine environmental protection, sea-farming etc. in the seawater, is one of the most basic observation project of marine environment investigation, marine pollution monitoring.
At present, what the in-site measurement seawater dissolved oxygen adopted is Clarke (Clark) electrode type book film cover type Polarographic sensor, its working electrode is the negative electrode of gold electrode, dissolved oxygen of seawater plays reduction reaction by permeable membrane at negative electrode, and the size of reduction current depends on the osmotic pressure of dissolved oxygen DO in the seawater.Therefore, can determine the concentration of dissolved oxygen DO in the seawater according to the size of reduction current.
There are problems such as instability and measured value drift about in time in existing seawater dissolved oxygen sensor, influences its long-term continuous working.In existing galvanic cell type dissolved oxygen sensor, the ion path of sensitive electrode is open, leaves very big space around the negative electrode.In electrolyte chamber, electrolytic solution links to each other with cathode surface by the ion path, when dissolved oxygen DO is by permeable membrane arrival cathode surface in the tested seawater, also can diffuse in the electrolytic solution in the electrolyte chamber by the ion path.Diffuse to this part dissolved oxygen DO in the electrolytic solution, prolongation in time accumulates gradually, the phase counterdiffusion also turns back to cathode surface gradually again, participate in the reduction reaction of negative electrode, the dissolved oxygen DO that causes being diffused into the sensor sensing electrode surface constantly changes, and causes dissolved oxygen sensor to produce drift in long-continued work.
Have dissolved oxygen sensor life period drifting problem now, can not satisfy the occasion of long-term continuous working, as the on-the-spot actual needs of ocean observation station, oceanographic buoy etc.For ensureing the accuracy of dissolved oxygen sensing, sensor will often be calibrated in using, and this brings inconvenience to practical application.Therefore, improving long term operation stability, will be the subject matter of dissolved oxygen sensor technical development.
Summary of the invention
The closed dissolved oxygen sensor that the utility model is related is made up of sensing probe and body two parts.Whole device profile is that two different right cylinders of diameter are formed by connecting up and down, and the less right cylinder of upper diameter is the sensing probe of sensor, and negative electrode, anode and electrode holder are installed in the cylindrical shell of sensing probe; The right cylinder that lower diameter is bigger is a body, interior dress change-over circuit.Circuit board is connected with the lead-in wire of sensing probe electrode, and underpart has cable to draw.Sensing probe and body are fixed together by the electrodes base of short cylindrical shape.
The basic element of character of sensor sensing probe comprises negative electrode, anode, electrolytic solution and an electrolyte chamber of Sheng electrolytic solution and the semi-permeable diaphragm that tested seawater separates.
It is inverted cylindric that the sensor sensing probing shell is, and constitutes the top of sensing probe shell at the bottom of the cylinder.There is radian on sensing probe shell top and shows spirogyrate, and there is a circular hole center, shell top, four the semicircle pillar holes that evenly distribute on the inwall of circular hole, and four semicircle pillar holes penetrate the shell top.The other end of sensing probe barrel shrond is fixed on the electrodes base by epoxy resin.
There is electrode holder in centre in the sensor sensing probe, is used for the negative electrode and the anode of installing electrodes.Bracing frame is umbrella, and negative electrode is installed on the umbrella cover, and anode is installed on the umbrella handle.The size of bracing frame umbrella cover is big or small consistent with center, sensing probe shell top circular hole, and the bracing frame umbrella cover places in the circular hole on probing shell top.The bracing frame umbrella handle is the roundlet column of hollow, and umbrella handle is fixed on the electrodes base by epoxy resin.
The electrode holder umbrella cover has the groove of caving in, face in the form of a ring around the groove.There is an aperture at the groove center, and aperture communicates with the hollow of umbrella handle.The disk shape negative electrode of band radian is embedded in the groove of bracing frame umbrella cover.Negative electrode is gold electrode, i.e. working electrode.Circumferentia around the cathode surface, groove, sensing probe shell top three's radian are consistent.Cathode leg passes the hollow and the cylindrical electrode base of bracing frame groove central small hole, bracing frame umbrella handle, enters in the sensor body to be connected with circuit board.The polyvinyl fluoride semi-permeable diaphragm is posted on sensing probe shell top.Semi-permeable diaphragm, is close to the surface of circumferentia and disk negative electrode around probing shell top end surface, the groove on probing shell by O type circle hoop.
It is cylindric that anode is, and is enclosed within on the electrode holder umbrella handle.Plate lead draws down along the bracing frame umbrella handle outside, passes the cylindrical electrode base, enters in the sensor body to be connected with circuit board.
Annular spaces is an electrode cavity between sensing probe shell and the electrode holder, interior Sheng KCL electrolytic solution.
Closed dissolved oxygen sensor described in the utility model, its sensing probe shell top is with the electrode holder umbrella cover, base closed the ion path, ion is only exchanged by four semicircle pillar holes, limit oxygen in water and diffused in the interior electrolytic solution of electrode cavity, ensured the long-term continuous working ability of sensor.
Description of drawings
Fig. 1 is closed dissolved oxygen sensor structural representation.Among the figure, 1-sensing probe, 2-electrodes base, 3-body, the 4-negative electrode, 5-bracing frame umbrella cover, 6-semi-permeable diaphragm, 7-O type circle, 8-ion path, 9-bracing frame umbrella handle, the 10-anode, 11-electrolyte chamber, 12-plate lead, the 13-cathode leg, 14-circuit board, 15-circuit board support, the 16-body fuselage, 17-seals bottom, 18-cable.
Fig. 2 is a closed dissolved oxygen sensor sensing probe top vertical view.Among the figure, 1-negative electrode, 2-bracing frame umbrella cover, 3-ion path, 4-sensing probe shell top.
Embodiment
Now in conjunction with the accompanying drawings embodiment of the present utility model is described.As shown in Figure 1.There is a circular hole sensor sensing center, 1 shell top of popping one's head in, four the semicircle pillar holes that evenly distribute on the inwall of circular hole, and four semicircle pillar holes penetrate sensing probe shell top.Electrode holder in the sensing probe is umbrella, and the size of bracing frame umbrella cover 5 is big or small consistent with center, sensing probe shell top circular hole, and the bracing frame umbrella cover places in the circular hole on probing shell top.Bracing frame umbrella handle 9 is the small column of hollow, and umbrella handle is fixed on the electrodes base 2 by epoxy resin.
The electrode holder umbrella cover has the groove of caving in, and there is an aperture at the groove center, and aperture communicates with the hollow of umbrella handle.The disk shape negative electrode 4 of band radian is embedded in the groove of bracing frame umbrella cover 5, and circumferentia around the cathode surface, groove, sensing probe cover top portion three radian are consistent.Cathode leg 13 passes the hollow and the cylindric electrodes base 2 of bracing frame groove central small hole, bracing frame umbrella handle 9, enters in the sensor body 3 to be connected with circuit board 14.There is polyvinyl fluoride semi-permeable diaphragm 6 on sensing probe shell top, and semi-permeable diaphragm 6, is close to probing shell surface and disk shape cathode surface on probing shell by O type circle 7 hoops.
Claims (8)
1, a kind of closed dissolved oxygen sensor, form by sensing probe and body two parts, sensing probe and body are fixed together by the electrodes base of short cylindrical shape, it is characterized in that the sensing probe shell is inverted cylindric, constitute the top of sensing probe shell at the bottom of the cylinder, there is the electrode holder of umbrella in centre in the sensing probe, and the bracing frame umbrella cover places the top of sensing probe shell, and the bracing frame umbrella handle is fixed on the electrodes base.
2, according to the described closed dissolved oxygen sensor of claim 1, it is characterized in that there is radian on sensing probe shell top and shows spirogyrate, there is a circular hole center, shell top, and four semicircle pillar holes evenly distribute on the inwall of circular hole.
3, according to the described closed dissolved oxygen sensor of claim 1, the size that it is characterized in that the bracing frame umbrella cover is big or small consistent with center, sensing probe shell top circular hole, and the bracing frame umbrella cover places in the circular hole on probing shell top.
4,, it is characterized in that the bracing frame umbrella handle is the roundlet column of hollow according to the described closed dissolved oxygen sensor of claim 1.
5, according to claim 1 and the described closed dissolved oxygen sensor of claim 3, it is characterized in that the electrode holder umbrella cover has the groove that caves in, there is an aperture at the groove center, and aperture communicates with the hollow of bracing frame umbrella handle.
6, according to claim 1 and the described closed dissolved oxygen sensor of claim 5, it is characterized in that being embedded in the groove of bracing frame umbrella cover with the disk shape negative electrode of radian, circumferentia around the cathode surface, groove, sensing probe shell top three's radian are consistent, cathode leg passes the hollow and the electrodes base of bracing frame groove central small hole, bracing frame umbrella handle, enters in the sensor body to be connected with circuit board.
7, according to claim 1 and the described closed dissolved oxygen sensor of claim 4, it is characterized in that anode is cylindric, be enclosed within on the electrode holder umbrella handle that plate lead draws down along the bracing frame umbrella handle outside, pass the cylindrical electrode base, enter and be connected with circuit board in the sensor body.
8, according to claim 1 and the described closed dissolved oxygen sensor of claim 6, it is characterized in that sensing probe shell top posts the polyvinyl fluoride semi-permeable diaphragm, semi-permeable diaphragm, is close to circumferentia and disk cathode surface around probing shell top end surface, the bracing frame umbrella cover groove on probing shell by O type circle hoop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU022916776U CN2599575Y (en) | 2002-12-20 | 2002-12-20 | Closed dissolved-oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU022916776U CN2599575Y (en) | 2002-12-20 | 2002-12-20 | Closed dissolved-oxygen sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2599575Y true CN2599575Y (en) | 2004-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU022916776U Expired - Fee Related CN2599575Y (en) | 2002-12-20 | 2002-12-20 | Closed dissolved-oxygen sensor |
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| CN (1) | CN2599575Y (en) |
Cited By (4)
| 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 |
| CN101281161B (en) * | 2008-05-21 | 2012-01-04 | 中国人民解放军第三军医大学军事预防医学院 | Detector for fast detecting phthalic ester concentration |
| CN103353474A (en) * | 2013-04-28 | 2013-10-16 | 苏州天和自动化系统有限公司 | Dissolved oxygen sensor |
| 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 |
-
2002
- 2002-12-20 CN CNU022916776U patent/CN2599575Y/en not_active Expired - Fee Related
Cited By (5)
| 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 |
| CN101281161B (en) * | 2008-05-21 | 2012-01-04 | 中国人民解放军第三军医大学军事预防医学院 | Detector for fast detecting phthalic ester concentration |
| CN103353474A (en) * | 2013-04-28 | 2013-10-16 | 苏州天和自动化系统有限公司 | Dissolved oxygen sensor |
| CN103353474B (en) * | 2013-04-28 | 2015-03-04 | 苏州天和自动化系统有限公司 | Dissolved oxygen sensor |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |