CN214472932U - Compound four-electrode conductivity sensor - Google Patents
Compound four-electrode conductivity sensor Download PDFInfo
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- CN214472932U CN214472932U CN202021246259.1U CN202021246259U CN214472932U CN 214472932 U CN214472932 U CN 214472932U CN 202021246259 U CN202021246259 U CN 202021246259U CN 214472932 U CN214472932 U CN 214472932U
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Abstract
The utility model discloses a composite four-electrode conductivity sensor, which comprises an electrode tube, a four-electrode element, a temperature sensing element, a high-temperature lead and an insulating part; the four-electrode element comprises an inner graphite cylinder, an intermediate insulating layer and an outer graphite ring; the diameter of the inner cylinder is 1-5mm, the ring width of the middle insulating layer is 0.5-5mm, and the ring width of the outer circular ring is 0.1-5 mm. The sensor adopts a graphite four-electrode element with a specific size and shape, a temperature sensor with the precision of A level and a stable connection mode of a high-temperature lead and graphite, and the higher accuracy and stability of a measuring result are ensured together. The utility model discloses a real-time accurate measurement of conductivity and temperature in the solution can be realized to compound conductivity sensor, has characteristics such as rational in infrastructure, processing convenience, measuring range are wide, measurement accuracy is high.
Description
Technical Field
The utility model relates to a sensor and water quality monitoring technical field, concretely relates to compound four-electrode conductivity sensor.
Background
With the development of science and technology and the enhancement of environmental awareness, people put higher demands on accurate measurement and analysis of the electrical conductivity of water media (domestic water, industrial water and the like). The conductivity of a solution is the general phenomenon of all ionic movements of the solution, and generally we measure the conductivity (inverse of resistivity) of a conductor. The conductivity is one of five conventional parameters of water quality in an automatic water quality monitoring project, and the accurate measurement of the conductivity has important significance in the fields of environmental monitoring, chemical industry, medical treatment, food, ocean development and the like.
The electrode type conductivity sensor can realize accurate measurement of the conductivity of the solution. The existing electrode type conductivity sensors are generally classified into two electrodes and a multi-electrode. Two-electrode conductivity sensors typically consist of a pair of plate electrodes, the area and distance of which determine the electrode constant. The two-electrode constants are typically divided into 0.01, 0.1, 1 and 10, with corresponding measurement ranges of 0-2uS/cm, 2-200uS/cm, 200-2000uS/cm, 2-20mS/cm and 20-200mS/cm, respectively. At present, the two-electrode conductivity sensor is most applied domestically and has the characteristics of simple structure, convenience in manufacturing, high measurement precision and the like, but the electrode has the problems of narrow measurement range, serious electrode polarization phenomenon and the like in the application process.
Multi-electrode conductivity sensors are one of the future development directions for conductivity sensors. The four-electrode conductivity sensor is the most widely used multi-electrode conductivity sensor at present, and generally comprises two voltage electrodes and two current electrodes. When the alternating current is adopted for power supply, the current on the voltage electrode is almost zero, the electrolytic action of the electrode on the solution is eliminated, the electrode polarization phenomenon can be effectively avoided, and the measurement precision and the measurement range of the conductivity are finally improved. With the wide popularization of intelligent sensors and multifunctional sensors, it is necessary to develop a composite four-electrode conductivity sensor.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a compound four-electrode conductivity sensor device to reach the purpose that reduces the preparation degree of difficulty, improves measurement range and measurement accuracy, extends conductivity sensor range of application.
In order to achieve the technical purpose, the utility model adopts the following technical scheme: a composite four-electrode conductivity sensor comprises an electrode tube, a four-electrode element, a temperature sensing element, a high-temperature lead and an insulating part;
the four-electrode element is positioned inside the electrode tube, and the temperature sensing element is exposed outside the electrode tube or fixed inside the electrode tube;
the four-electrode element includes: the graphite electrode comprises a metal rod, an inner graphite cylinder, a middle insulating layer and an outer graphite ring; the diameter of the inner graphite cylinder is 1-5mm, the ring width of the middle insulating layer is 0.5-5mm, and the ring width of the outer circular ring is 0.1-5 mm;
the metal rod is embedded in the inner graphite cylinder, and the high-temperature lead is welded on the metal rod after the metal rod is fixed by insulating glue.
Further, the material of the four-electrode element can also be stainless steel, titanium alloy or platinum.
Furthermore, the electrode tube is one of PVC, ABS, PC, PTFE or PEEK, and the diameter of the electrode tube is 5mm-20 mm.
Further, the temperature sensing element can be an NTC, PT-1000 or PT-100 temperature sensor.
Furthermore, the high-temperature wire can be made of copper wire or tinned copper wire, and the insulation resistance of the high-temperature wire is 1010Omega or more.
Furthermore, the outer diameter of the bare wire of the high-temperature wire is 0.2mm-1mm, and the outer diameter of the covered wire is 0.3mm-2 mm.
Further, the insulating part material is epoxy resin, phenolic resin or polyurethane.
Be different from prior art, the utility model discloses the beneficial technological effect who has is: a high-precision temperature sensor is integrated, and two constants of conductivity and temperature can be accurately measured in real time; specific proportional size among the four graphite electrodes is designed, conductivity measurement precision (higher than 1.5 FS%) and measurement range (wider than 0-200mS/cm) are improved, and the method can be applied to industrial production and laboratory conductivity measurement; the mode that the original high-temperature wire of the inner electrode is directly wound on the outer surface of the graphite piece is changed into the mode that the metal rod is embedded in the graphite piece, the high-temperature wire is finally welded on the metal rod after the metal rod is fixed by insulating glue, and the connection mode improves the conductive stability of a four-electrode original piece and reduces the preparation difficulty of a four-electrode element.
Drawings
Fig. 1 is a schematic structural diagram of a four-electrode conductivity sensor according to the present invention;
fig. 2 is an enlarged view of a portion a in fig. 1.
In the figure: 1-electrode tube; 2-a four-electrode element; 3-a temperature sensing element; 4-an insulating portion; 5-high temperature wire; 6-copper bar.
Detailed Description
In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the following will combine the accompanying drawings to describe the technical solution of the embodiments of the present invention in further detail. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a composite four-electrode conductivity sensor according to the present invention. Comprises an electrode tube 1, a four-electrode element 2, a temperature sensing element 3, an insulating part 4 and a high-temperature lead 5; the four-electrode element is positioned inside the electrode tube, and the temperature sensing element is exposed outside the electrode tube or fixed inside the electrode tube; the four-electrode element 2 includes: the graphite electrode comprises a metal rod 6, an inner graphite cylinder, a middle insulating layer and an outer graphite ring; the diameter of the inner graphite cylinder is 1-5mm, the ring width of the middle insulating layer is 0.5-5mm, and the ring width of the outer circular ring is 0.1-5 mm.
The metal rod 6 is embedded in the inner graphite cylinder, and the high-temperature lead 5 is welded on the metal rod 6 after the metal rod 6 is fixed by insulating glue. Preferably, the metal rod 6 is a copper rod.
In other embodiments, the material of the four-electrode element 2 may also be stainless steel, titanium alloy or platinum.
Preferably, the electrode tube 1 is one of PVC, ABS, PC, PTFE or PEEK, and the diameter of the electrode tube 1 is 5mm-20 mm.
The high-temperature lead 5 can be made of copper wire or tinned copper wire, and the insulation resistance of the high-temperature lead is 1010Omega or more. The outer diameter of a bare wire of the high-temperature wire 5 is 0.2mm-1mm, and the outer diameter of a covered wire is 0.3mm-2 mm.
Preferably, the insulating part 4 is made of epoxy resin, phenolic resin, polyurethane and the like with good insulating property; the temperature sensing element 3 can be exposed outside the electrode tube 1 or fixed inside the electrode tube 1, and the temperature sensing element 3 can be a temperature sensor such as an NTC, PT-1000, PT-100 and the like.
The composite four-electrode conductivity sensor provided by the patent comprises a conductivity and temperature two-parameter testing element. The following description is given with reference to specific examples:
example 1
The electrode tube 1 of the four-electrode sensor adopts a PC tube with the diameter of 12 mm; the four-electrode component 2 is made of graphite materials, the diameter of an inner cylinder of the four-electrode component is 3mm, the ring width of the middle insulating layer is 2mm, and the ring width of an outer circular ring is 3 mm; the temperature sensing element 3 is PT-1000 and is exposed out of the electrode tube part; the insulating part 4 is made of epoxy resin with stable performance; the high-temperature lead 5 is a tinned copper wire with the outer diameter of 0.4mm (including the outer diameter of a covered wire of 0.6 mm). (see Table 1 for test data)
Example 2
The electrode tube 1 of the four-electrode sensor adopts a PC tube with the diameter of 10 mm; the four-electrode component 2 is made of graphite materials, the diameter of an inner cylinder of the four-electrode component is 2mm, the ring width of the middle insulating layer is 2mm, and the ring width of an outer circular ring is 2 mm; the temperature sensing element 3 is PT-1000 and is exposed out of the electrode tube part; the insulating part 4 is made of epoxy resin with stable performance; the high-temperature lead 5 is a tinned copper wire with the outer diameter of 0.4mm (including the outer diameter of a covered wire of 0.6 mm).
Example 3
An electrode tube 1 of the four-electrode sensor adopts a PEEK tube with the diameter of 10 mm; the four-electrode component 2 is made of graphite, the diameter of an inner cylinder of the four-electrode component is 1.5mm, the ring width of the middle insulating layer is 2mm, and the ring width of an outer circular ring is 1.3 mm; the temperature sensing element adopts NTC-30K and is hidden in the electrode tube; the insulating part 4 is made of epoxy resin with stable performance; the high-temperature lead 5 is a tinned copper wire with the outer diameter of 0.4mm (including the outer diameter of a covered wire of 0.6 mm).
Example 4
An electrode tube 1 of the four-electrode sensor adopts an ABS tube with the diameter of 10 mm; the four-electrode component 2 is made of graphite, the diameter of an inner cylinder of the four-electrode component is 2.5mm, the ring width of the middle insulating layer is 2mm, and the ring width of an outer circular ring is 2 mm; the temperature sensing element adopts NTC-30K and is hidden in the electrode tube; the insulating part 4 is made of polyurethane with stable performance; the high-temperature lead 5 is a tinned copper wire with the outer diameter of 0.4mm (including the outer diameter of a covered wire of 0.6 mm).
TABLE 1.25 deg.C composite four-electrode conductivity sensor test data sheet
| Marking liquid | Measurement of indicated value | Error of indication (less than or equal to +/-1.5% FS) |
| 146.5μS/cm | 145.6μS/cm | -0.04％FS |
| 1408μS/cm | 1410μS/cm | 0.1％FS |
| 12.85mS/cm | 12.90mS/cm | 0.25％FS |
| 100mS/cm | 99.3mS/cm | -0.35％FS |
| 200mS/cm | 199.2mS/cm | 0.4％FS |
It should be understood by those skilled in the art that the structure of the present invention is not limited to the embodiments described in the detailed description, and the above detailed description is only for the purpose of explaining the present invention and is not intended to limit the present invention. The technical solution according to the present invention is used by those skilled in the art to derive other embodiments, which also belong to the technical innovation scope of the present invention, and the protection scope of the present invention is defined by the claims and their equivalents.
Claims (7)
1. A composite four-electrode conductivity sensor is characterized by comprising an electrode tube, a four-electrode element, a temperature sensing element, a high-temperature lead and an insulating part;
the four-electrode element is positioned inside the electrode tube, and the temperature sensing element is exposed outside the electrode tube or fixed inside the electrode tube;
the four-electrode element includes: the graphite electrode comprises a metal rod, an inner graphite cylinder, a middle insulating layer and an outer graphite ring; the diameter of the inner graphite cylinder is 1-5mm, the ring width of the middle insulating layer is 0.5-5mm, and the ring width of the outer circular ring is 0.1-5 mm;
the metal rod is embedded in the inner graphite cylinder, and the high-temperature lead is welded on the metal rod after the metal rod is fixed by insulating glue.
2. The composite four-electrode conductivity sensor according to claim 1, wherein the material of the four-electrode element is stainless steel, titanium alloy or platinum.
3. A composite four-electrode conductivity sensor according to claim 1, wherein the electrode tube is one of PVC, ABS, PC, PTFE or PEEK, and the diameter of the electrode tube is 5mm-20 mm.
4. A composite four-electrode conductivity sensor according to claim 1, wherein said temperature sensing element is an NTC, PT-1000, PT-100 temperature sensor.
5. The composite four-electrode conductivity sensor according to claim 1, wherein the high temperature conductive wire is made of copper wire or tin-plated copper wire, and has an insulation resistance of 1010Omega or more.
6. The composite four-electrode conductivity sensor according to claim 5, wherein the bare wire outer diameter of the high temperature wire is 0.2mm-1mm, and the covered wire outer diameter is 0.3mm-2 mm.
7. The composite four-electrode conductivity sensor according to claim 1, wherein the insulating portion material is an epoxy resin, a phenolic resin or a polyurethane material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021246259.1U CN214472932U (en) | 2020-06-30 | 2020-06-30 | Compound four-electrode conductivity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021246259.1U CN214472932U (en) | 2020-06-30 | 2020-06-30 | Compound four-electrode conductivity sensor |
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| Publication Number | Publication Date |
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| CN214472932U true CN214472932U (en) | 2021-10-22 |
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| CN202021246259.1U Active CN214472932U (en) | 2020-06-30 | 2020-06-30 | Compound four-electrode conductivity sensor |
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| CN (1) | CN214472932U (en) |
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