CN202710503U - Four-electrode electrical conductivity sensor - Google Patents
Four-electrode electrical conductivity sensor Download PDFInfo
- Publication number
- CN202710503U CN202710503U CN2012201848160U CN201220184816U CN202710503U CN 202710503 U CN202710503 U CN 202710503U CN 2012201848160 U CN2012201848160 U CN 2012201848160U CN 201220184816 U CN201220184816 U CN 201220184816U CN 202710503 U CN202710503 U CN 202710503U
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- electrode
- lower house
- electrodes
- conductivity sensors
- shell body
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- 238000000034 method Methods 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 8
- 239000010439 graphite Substances 0.000 claims abstract description 8
- 238000005538 encapsulation Methods 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 9
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 239000007772 electrode material Substances 0.000 claims description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 1
- 239000003153 chemical reaction reagent Substances 0.000 description 13
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 12
- 229910052697 platinum Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Images
Abstract
The utility model discloses a four-electrode electrical conductivity sensor which comprises an upper shell body and a lower shell body. A conducting wire hole is machined in the upper shell body, the lower shell body is machined to be a vacant shell, and electrodes which are integrally machined comprise two current electrodes and two voltage electrodes. Before the process of embedment, the electrodes are fixed through electrode fixing parts and then fixed on the lower shell body through pins, the lower shell body is provided with a conducting wire fixing ring, random shaking of a conducting wire in the process of the embedment is avoided, and a disconnection rate is reduced. The electrodes of the four-electrode electrical conductivity sensor are machined in integrated mode by utilizing graphite as material, machining is easy, price is low, symmetry of the electrodes can be accurately ensured, and measurement accuracy is improved. The four-electrode electrical conductivity sensor has the advantages of being high in measurement accuracy, little in environmental pollution, good in stability of an instrument, simple in structure, low in cost, long in service life and the like.
Description
Technical field
The utility model relates to a kind of conductivity sensor of measuring solution ion concentration, particularly a kind of four electrode conductivity sensors.
Background technology
Conductivity sensor mainly contains two kinds of mode of operations, induction type and electric pole type, main employing is electric pole type at present, what traditional conductivity sensor adopted is two electric pole types, when measuring for two electrode conductivity sensors, add the voltage signal of uniform amplitude between two electrodes, certain electric current of flowing through on the electrode, size of current depends on the quantity of contained ion in the solution.In this two electrode technology measuring processes, electrode is galvanic electrode, is again voltage electrode.In fact, as long as have electric current to pass through on the electrode, will produce polarizing voltage on the surface of contact of solution and electrode, make to measure to produce certain error.
Four electric pole type conductivity sensors are focuses of studying both at home and abroad at present, and four electrode conductivity sensors mainly are comprised of electronic surveying unit and four electrode conductance ponds.Independently galvanic electrode and voltage electrode can be eliminated the error that polarization is brought in the solution measuring process in the four electrode method.
At present, the electrode of report four electrode conductivity sensors is comprised of platinum round dot group on the document, galvanic electrode is that a diameter is the platinum cylinder of 2mm, and voltage electrode is formed by one group of platinum round dot that the center of circle distributes take galvanic electrode, forms because galvanic electrode is some discrete points, therefore be difficult for arranging, and platinum soaks in sewage solution for a long time, measures, and easily is corroded, comes off, and often carry out wiping, and platinum is not easy processing, and is expensive.The Inorganic Non-metallic Materials that the electrode supporting plate adopts and the expansion coefficient of electrode material metal platinum have very big difference, bring very large difficulty for sintering and encapsulation.The electrode supporting plate adopts open, and through placing for a long time, corroding, back up pad easily deforms, and is difficult to guarantee the constancy of cell constant of conductometric vessel.
The utility model content
In order to solve the problems of the prior art, the utility model provides a kind of four novel electrode conductivity sensors, and the electrode of this sensor is that the fine and close graphite of employing is material.Graphite is easily processed, low price.Electrode adopts whole processing, can accurately guarantee the symmetry of each electrode.Graphite and the encapsulation liquid that adopts have the expansion coefficient that approaches very much, and electrode and encapsulating housing are not easily separated when being subject to temperature variation.Further, the utility model provides a kind of effective solution for the discharge of bubble in the encapsulation process.In a word, the utility model can provide a kind of conductivity sensor, and it has, and high, the anti-environmental pollution of measuring accuracy is little, stability of instrument good, characteristics simple in structure, with low cost.
In order to achieve the above object, the technical scheme that adopts of the utility model is:
A kind of four electrode conductivity sensors, comprise upper and lower two housings, in encapsulation process by in housing, pouring into the mixture of epoxy resin and hardening agent, electrode and wire are encapsulated in the housing, it is characterized in that: be provided with the wire set collar in lower house, described wire set collar limits the layout trend of wire in lower house.
Described four electrode conductivity sensors is characterized in that: described electrode material is graphite.
Described four electrode conductivity sensors is characterized in that: described electrode comprises cylindric galvanic electrode and is placed in the outer ring-type voltage electrode of described cylindric galvanic electrode.
Described four electrode conductivity sensors is characterized in that: described electrode is fixed by electrode fixuture, and described electrode fixuture is fixed in the inside ghost of lower house by the pin that radially passes the lower house shell wall.
Described four electrode conductivity sensors is characterized in that: described electrode integral processes, and by secondary processing electrode is divided into independently four after encapsulation, two galvanic electrodes and two voltage electrodes.
Described four electrode conductivity sensors is characterized in that: centered by described pin, mill a straight trough shape through hole at described lower house during secondary processing.
Described four electrode conductivity sensors is characterized in that: be provided with bleeder vent and electrode cable groove on the described electrode.
Described four electrode conductivity sensors is characterized in that: what be used for removing air in the described lower house when also comprising encapsulated electrode vacuumizes vessel and vacuum pump.
Described four electrode conductivity sensors is characterized in that: encapsulation reagent adopts the mixture of 2023 epoxies and 2105c hardening agent, and mixing ratio is 2:1.
The utility model beneficial effect is: the electrode of four electrode conductivity sensors of the present utility model is that the fine and close graphite of employing is material, conveniently processes, reduced cost.Electrode adopts whole processing, can accurately guarantee the symmetry of each electrode.Graphite and the encapsulation liquid that adopts have the expansion coefficient that approaches very much, and electrode and encapsulating housing are not easily separated when being subject to temperature variation.Special packaging technology is more advantageously discharged the bubble in the encapsulation process.The conductivity cell structure of this patent is firm, has guaranteed the constancy of cell constant of conductometric vessel.In a word, this conductivity sensor have that high, the anti-environmental pollution of measuring accuracy is little, stability of instrument good, characteristics simple in structure, with low cost.
Description of drawings
Figure 1A is the utility model measuring principle figure;
Figure 1B is A-A cut-open view among Fig. 1;
Fig. 2 A is external structure schematic diagram after the utility model encapsulation;
Fig. 2 B inner structure schematic diagram of the present utility model;
Fig. 3 is the electrode structure schematic diagram among Fig. 2 B;
Fig. 4 A is that the utility model carries out external structure schematic diagram after the secondary processing;
Fig. 4 B is that the utility model carries out inner structure schematic diagram after the secondary processing.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Shown in Fig. 2 A, Fig. 2 B, four electrode conductivity sensors of the present utility model, it has a upper shell 2 and a lower house 4, is processed with the wire guide 10 that connects to lower house 4 in the upper shell 2, can hold wire 1 in the wire guide 10 and pass.Lower house 4 is processed into ghost 5, and electrode 8 is fixed by electrode fixuture 9, and then the shell wall that is passed lower house by pin 11 is fixed to electrode fixuture 9 in the inside ghost 5 of lower house 4.Wire 1 one ends link to each other with the silver-gilt copper wire ring 7 of lower house 4 interior settings, and the wire guide 10 of the other end in upper shell 2 passes.The unlikely wire 1 that damages during for secondary processing, the layout of wire 1 in lower house 4 is fixed by wire set collar 3, wire 1 links to each other with silver-gilt copper wire ring 7, silver-gilt copper wire ring 7 is fixed on the electrode 8 by electrode cable groove 6, make in the embedding process that wire 1 is unlikely arbitrarily to be rocked, and silver-gilt copper wire ring 7 and electrode 8 are combined firmly, reduce burn out rate.
As shown in Figure 3, be electrode 8 structures among Fig. 2 B, it contains galvanic electrode 82 and voltage electrode 81, be separated into two galvanic electrodes 82 and two voltage electrodes 81 after the secondary processing, accurately symmetrical in twos in order to guarantee secondary processing after-current electrode 82 and voltage electrode 81, adopt whole processing, gap length between galvanic electrode 82 and the voltage electrode 81 is the annulus of 1mm, narrow space, in order to make encapsulation reagent enter annular section between two electrodes, be processed with air hole 84 at electrode, be fixed on the electrode 8 in order to make plain conductor, can be processed with electrode cable groove 6 thereon.
Prepare encapsulation reagent: owing to space between conductivity meter probe inside, the electrode is little, require the epoxy resin viscosity little, just be easy to embedding; Consider conductivity meter environment for use and instrument performance, require simultaneously epoxy resin that the characteristics such as high-adhesive-strength, cure shrinkage is little, chemical-resistance good, electrical insulating property is good, product size is stable, water-intake rate is low are arranged.Epoxy resin adopts the 2023(single-component epoxy compound resin of triple bond company in the present embodiment), hardening agent adopts the 2105c of triple bond company, mixing ratio is 2:1, epoxy resin with stir after hardening agent mixes with proportioning, be put into homemade vacuumizing in the vessel, the bubble that produces in the mixed process is driven out of, in order to guarantee the dilutability of mix reagent, whole process will be finished as early as possible, avoids mix reagent phenomenon to occur solidifying.
Encapsulation process: encapsulate after all parts install, during encapsulation, take off upper shell 2, slowly (make the mix reagent of the epoxy of getting ready in advance and hardening agent the air in the lower house have time enough to discharge) and pour into lower house 4, if until reagent had not just had wire set collar 3(reagent too many, when vacuumizing, gas can be taken reagent out of lower house 4), there is filling the lower house 4 of mix reagent to put into self-control and vacuumizes vessel, the air that is detained in the lower house 4 of rushing.From vessel, take out instrument, continue to inject mix reagent to lower house 4, until fill.Then, lower house 4 is put into slowly heating in the high-low temperature chamber, Temperature Setting is 40 °, for the air that may carry in the mix reagent of adding after driving out of, after 1 hour, take out lower house 4, upper shell 2 is screwed in, reagent in the lower house 4 can be squeezed in the wire guide 10 of upper casing 2 bodies naturally, is full of whole wire guide 10.Again whole sensor is put into high-low temperature chamber, temperature transfers to 60 ° and was heating and curing 2 hours, closes the incubator switch, and it is cooled off naturally, takes out sensor after 24 hours, encapsulates complete.Sensor after the encapsulation is shown in Fig. 2 A, Fig. 2 B.
Sensor shown in Fig. 2 A, Fig. 2 B forms the sensor construction shown in Fig. 4 A, Fig. 4 B through secondary processing.Process is: the pin 11 that takes out first sensor behind the package curing, centered by center, two pins, 11 hole, mill the long 20mm that is at lower house 4, wide is the straight trough mouth through hole 12 of 5mm, this straight trough mouth through hole 12 is the conductance cell of sensor, the electrode 8 of integral body processing is blocked to be divided into four electrodes simultaneously two galvanic electrodes 82,84, two voltage electrodes 81,83, and accurately symmetrical in twos.
Below introduce in detail lower measuring principle of the present utility model:
Shown in Figure 1A, Figure 1B, this conductance cell has two cylindric galvanic electrodes 82,84 and two ring- type voltage electrodes 81,83, is installed in respectively on the supporting surface of two parallel and insulation.Pass through in the slit of fluid to be measured 100 between two supporting plane galvanic electrodes during measurement.Because the galvanic electrode two ends have applied an AC signal and by electric current, have set up electric field in fluid media (medium), respond to generation voltage by two voltage electrodes.Exchange current by between the control galvanic electrode makes electric current I
cKeep constant, when electrical conductivity of solution changes, the voltage V at voltage electrode two ends
cCorresponding changing.There is certain corresponding relation in the voltage in voltage electrode loop corresponding to the conductivity of detected solution, can try to achieve by the voltage of measuring voltage electrode loop the conductivity of solution according to this relation.Expressed by following formula:
In the formula:
C is the fluid to be measured conductivity;
K is cell constant of conductometric vessel;
R
cImpedance for conductance cell;
V
cBe R
cThe pressure drop at two ends (being voltage between the voltage electrode);
I
cBe the electric current by galvanic electrode.
Claims (8)
1. electrode conductivity sensor, comprise upper and lower two housings, in encapsulation process by in housing, pouring into the mixture of epoxy resin and hardening agent, electrode and wire are encapsulated in the housing, it is characterized in that: be provided with the wire set collar in lower house, described wire set collar limits the layout trend of wire in lower house.
2. four electrode conductivity sensors according to claim 1, it is characterized in that: described electrode material is graphite.
3. four electrode conductivity sensors according to claim 2 is characterized in that: described electrode comprises cylindric galvanic electrode and is placed in the outer ring-type voltage electrode of described cylindric galvanic electrode.
4. four electrode conductivity sensors according to claim 3, it is characterized in that: described electrode is fixed by electrode fixuture, and described electrode fixuture is fixed in the inside ghost of lower house by the pin that radially passes the lower house shell wall.
5. according to claim 2,3 or 4 described four electrode conductivity sensors, it is characterized in that: described electrode integral processes, and by secondary processing electrode is divided into independently four after encapsulation, two galvanic electrodes and two voltage electrodes.
6. four electrode conductivity sensors according to claim 5 is characterized in that: centered by described pin, mill a straight trough shape through hole at described lower house during secondary processing.
7. four electrode conductivity sensors according to claim 5 is characterized in that: be provided with bleeder vent and electrode cable groove on the described electrode.
8. four electrode conductivity sensors according to claim 2 is characterized in that: what be used for removing air in the described lower house when also comprising encapsulated electrode vacuumizes vessel and vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201848160U CN202710503U (en) | 2012-04-27 | 2012-04-27 | Four-electrode electrical conductivity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201848160U CN202710503U (en) | 2012-04-27 | 2012-04-27 | Four-electrode electrical conductivity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202710503U true CN202710503U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201848160U Expired - Lifetime CN202710503U (en) | 2012-04-27 | 2012-04-27 | Four-electrode electrical conductivity sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN202710503U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592341A (en) * | 2013-11-12 | 2014-02-19 | 广州中国科学院先进技术研究所 | Contact type four-electrode salinity sensor based on MEMS (micro electro mechanical systems) technology and detection method of salinity sensor |
| CN103601147A (en) * | 2013-11-12 | 2014-02-26 | 广州中国科学院先进技术研究所 | Preparation method of contact type four-electrode salinity sensor based on micro electro mechanical systems (MEMS) technology |
| CN107132419A (en) * | 2017-06-21 | 2017-09-05 | 华南理工大学 | A kind of high conductivity graphite sensor |
| CN107290591A (en) * | 2016-04-04 | 2017-10-24 | 青岛大学 | A kind of resistivity test device of vertical liquid |
| CN109946346A (en) * | 2014-11-10 | 2019-06-28 | 音-斯图公司 | Cleanable conductivity sensor and the method for carrying out conductivity measurement in a liquid |
| CN111486977A (en) * | 2020-04-20 | 2020-08-04 | 德州尧鼎光电科技有限公司 | Four-electrode conductance adjustable temperature sensor |
-
2012
- 2012-04-27 CN CN2012201848160U patent/CN202710503U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103592341A (en) * | 2013-11-12 | 2014-02-19 | 广州中国科学院先进技术研究所 | Contact type four-electrode salinity sensor based on MEMS (micro electro mechanical systems) technology and detection method of salinity sensor |
| CN103601147A (en) * | 2013-11-12 | 2014-02-26 | 广州中国科学院先进技术研究所 | Preparation method of contact type four-electrode salinity sensor based on micro electro mechanical systems (MEMS) technology |
| CN109946346A (en) * | 2014-11-10 | 2019-06-28 | 音-斯图公司 | Cleanable conductivity sensor and the method for carrying out conductivity measurement in a liquid |
| CN107290591A (en) * | 2016-04-04 | 2017-10-24 | 青岛大学 | A kind of resistivity test device of vertical liquid |
| CN107132419A (en) * | 2017-06-21 | 2017-09-05 | 华南理工大学 | A kind of high conductivity graphite sensor |
| CN107132419B (en) * | 2017-06-21 | 2023-04-21 | 华南理工大学 | High conductivity graphite sensor |
| CN111486977A (en) * | 2020-04-20 | 2020-08-04 | 德州尧鼎光电科技有限公司 | Four-electrode conductance adjustable temperature sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID ELECTRIC POWER RESEARCH INSITITUTE NANJ Free format text: FORMER OWNER: NANJING NARI CO., LTD. Effective date: 20130709 Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: STATE GRID ELECTRIC POWER RESEARCH INSITITUTE Effective date: 20130709 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 210003 NANJING, JIANGSU PROVINCE TO: 100031 XICHENG, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130709 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: State Grid Electric Power Research Insititute Patentee after: Nanjing Nari Co., Ltd. Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Patentee before: State Grid Electric Power Research Insititute Patentee before: Nanjing Nari Co., Ltd. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20171211 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: State Grid Electric Power Research Insititute Patentee after: State Grid Corporation of China Co-patentee after: NARI Technology Development Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: State Grid Electric Power Research Insititute Patentee before: State Grid Corporation of China Co-patentee before: Nanjing Nari Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130130 |
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| CX01 | Expiry of patent term |