Disposable four-electrode conductivity detection device convenient to disassemble and assemble

Abstract

The utility model discloses a disposable four-electrode conductivity detection device convenient to disassemble and assemble, which is characterized in that two ends of a mounting pipe body are connected with pipeline joints, so that the device is convenient to disassemble, assemble and use; an electrode tube is sleeved in the mounting tube body, the temperature sensor is fixed on the electrode tube, four electrodes are equidistantly distributed on the electrode tube along the length direction of the electrode tube, one end of each of the four electrodes is connected with a direct-current power supply by winding a lead, and the other end of each of the four electrodes is connected with equipment to be measured; the four electrodes comprise a second electrode plate and a third electrode plate which are located on the inner side and used for measuring voltage, and a first electrode plate and a fourth electrode plate which are located on the outer side and used for measuring current. According to the scheme, a four-electrode connection mode is adopted, the length of a wire can be prevented from being limited, the detection result is more stable, and the accuracy of conductivity measurement is improved; in addition, compared with a traditional platinum electrode, the cost of the titanium alloy electrode is reduced, and the titanium alloy electrode is disposable.

Description

Technical Field

[0001] The utility model relates to a machine for high-precision conductivity detection, in particular to a disposable four-electrode conductivity detection device which is easy to assemble and disassemble, and belongs to the technical field of biomedicine research and development and production. Background Art

[0002] In the biopharmaceutical field, the conductivity of materials needs to be monitored during many stages such as fermentation, purification, and testing. The detection instruments used to monitor conductivity should be connected to the production equipment. Usually, such detection instruments require multiple installation steps and the assembly method is relatively complicated.

[0003] Furthermore, existing conductivity measuring instruments often use a two-electrode connection structure, resulting in long wiring and large measurement errors. Furthermore, the required electrode materials are often made of platinum, which is difficult to process and expensive to use, making it unsuitable for single-use applications. Therefore, it is necessary to improve existing measuring devices to enhance the stability and accuracy of conductivity measurements. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide a disposable four-electrode conductivity detection device that is easy to disassemble and assemble, so as to solve the problem of too long two-electrode lines in the prior art and improve detection and use performance.

[0005] The technical solution of this utility model is: a disposable four-electrode conductivity detection device that is easy to assemble and disassemble, comprising a hollow mounting tube body, with pipe joints movably connected to both ends of the mounting tube along its length. The device is characterized by: an electrode tube is sheathed within the mounting tube body, and the electrode tube has four electrodes equidistantly distributed along its length. One end of the four electrodes is connected to a DC power supply via a wound wire, and the other end is connected to the device to be measured. The four electrodes are all located within a housing, and the housing is mounted on the mounting tube body. The four electrodes include a second electrode sheet and a third electrode sheet located on the inside for measuring voltage, and a first electrode sheet and a fourth electrode sheet located on the outside for measuring current. The device also includes a temperature sensor fixed to the electrode tube.

[0006] Furthermore, in the above-mentioned disposable four-electrode conductivity detection device that is easy to assemble and disassemble, the pipeline connector is a TC chuck connector or a pagoda connector.

[0007] Furthermore, in the above-mentioned disposable four-electrode conductivity detection device that is easy to assemble and disassemble, the four electrodes and the mounting tube body are formed by insert injection molding.

[0008] Furthermore, in the above-mentioned disposable four-electrode conductivity detection device that is easy to assemble and disassemble, the first electrode sheet, the second electrode sheet, the third electrode sheet and the fourth electrode sheet are all made of titanium alloy material.

[0009] Furthermore, in the above-mentioned disposable four-electrode conductivity detection device that is easy to disassemble and assemble, the temperature sensor is a round hole patch type pt100 thermocouple temperature sensor.

[0010] Furthermore, in the above-mentioned disposable four-electrode conductivity detection device that is easy to disassemble and assemble, the temperature sensor is connected to a single-wire high-temperature long wire, and is connected to an external display instrument through the high-temperature long wire.

[0011] Furthermore, the disposable four-electrode conductivity detection device that is easy to disassemble and assemble, wherein: the high-temperature long wire is made of tinned copper wire, and its insulation resistance is 10 8 Ω or above.

[0012] Furthermore, in the above-mentioned disposable four-electrode conductivity detection device that is easy to assemble and disassemble, a terminal for connecting a wire is provided on the housing.

[0013] By adopting the technical solution of the present invention, the installation tube body is directly connected to the pipeline to be tested through the TC chucks or pagoda heads at both ends. When the fluid passes through the pipeline, the first electrode sheet and the fourth electrode sheet (current injection electrodes) contact the liquid to be tested or other conductive materials, maintaining a certain distance; the second electrode sheet and the third electrode sheet (voltage measurement electrodes) contact the liquid to be tested or other conductive materials, and maintain a certain distance, ensuring that the distance between them and the current injection electrodes is far enough to avoid the voltage generated by the current injection electrodes being sensed by the measuring electrodes and causing errors. Each electrode sheet is connected to the measuring equipment, and finally the conductivity can be measured through the equipped electronic system.

[0014] Compared with the existing technology, after adopting the technical solution of the utility model, conductivity detection is performed through a four-electrode connection method, which not only avoids the limitation of wire length, but also separates current and voltage, reduces the error caused by the electrode, makes the measurement result more stable, and improves the accuracy of conductivity measurement; moreover, the four electrodes are all made of titanium alloy, the manufacturing process is simple, can effectively avoid rust problems, and at the same time reduces the cost compared with traditional platinum electrodes.

[0015] In addition, TC chucks or pagoda heads are used at both ends of the installation tube body in this case, which is not only convenient for disassembly and assembly, but also can be adapted to various pipeline installations; the installation tube body and the outer shell are made of FDA-certified PP plastic material, which is lightweight and suitable for disposable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is the main view of the utility model;

[0017] Figure 2 It is a left view of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of the utility model;

[0019] Figure 4 This is a schematic diagram of the installation pipe structure of the utility model.

[0020] The meanings of the reference numerals in the figure are: 1-installation tube body, 2-pipe joint, 3-first electrode sheet, 4-second electrode sheet, 5-third electrode sheet, 6-fourth electrode sheet, 7-temperature sensor, 8-high-temperature long wire, 9-housing, 10-terminal. DETAILED DESCRIPTION

[0021] The following further illustrates the technical solution of the present invention with reference to the accompanying drawings to facilitate understanding and grasp. The components involved, such as the mounting tube 1, housing 9, and terminal 10, are commonly used components commonly known to those skilled in the art and are not subject to special requirements in this application. The terms "first," "second," "third," and "fourth" used in the description are intended solely for distinction and do not indicate a ranking.

[0022] like Figure 1 and Figure 2 As shown, the present invention provides a disposable four-electrode conductivity detection device that is easily assembled and disassembled. The device comprises a hollow mounting tube 1, with pipe connectors 2 movably connected to both left and right ends along its length. The pipe connectors 2 are either TC chuck connectors or pagoda connectors. TC chuck connectors prevent liquid accumulation, save cleaning time, and prevent leaks and detachments. They are suitable for various pipe connections, particularly in high-load bioprocesses and sterile liquid handling processes, such as filters and culture bags. Pagoda connectors are suitable for use with a variety of media, are corrosion-resistant, highly stable, and offer rapid response. They are suitable for quick-connect pipe connections and facilitate hose installation.

[0023] like Figure 3 and Figure 4As shown, according to the technical solution of the present invention, an electrode tube is sheathed within the mounting tube 1. Four electrodes are evenly spaced along its length. One end of each electrode is connected to a DC power supply via a wire loop, and the other end is connected to the device to be measured. Each of the four electrodes is housed within a housing 9 attached to the mounting tube 1. A four-terminal electrode method is employed, comprising a second electrode sheet 4 and a third electrode sheet 5 located on the inner side, used for voltage measurement; and a first electrode sheet 3 and a fourth electrode sheet 6 located on the outer side, used for current measurement. This connection eliminates contact resistance and lead resistance compared to a two-electrode connection, improving measurement accuracy. Furthermore, the larger the spacing between the current injection electrode and the voltage measurement electrode, the better, and the more uniform the arrangement, the better. Properly selecting the size and distance of each electrode sheet helps ensure conductivity measurement accuracy. A temperature sensor 7 is also fixed to the electrode tube, connected to the first electrode sheet 3, the second electrode sheet 4, the third electrode sheet 5, and the fourth electrode sheet 6, respectively.

[0024] Preferably, in the above structure: the four electrodes and the mounting tube body 1 are formed by insert injection molding, so that the assembly between the four electrodes and the mounting tube body 1 has good high repeatability and reliability, wherein the main functions of the insert include improving the local strength, rigidity, hardness and wear resistance of the plastic part, increasing the stability of the shape and size of the plastic part, and reducing the consumption of plastic; a terminal 10 is provided on the shell 9, and the wire is connected to the external device (for example: display instrument, etc.) through the provided terminal 10 for control use.

[0025] Preferably, the four electrodes include a cathode, an anode, a grid and a screen (compared with two electrodes, four electrodes have higher precision and a wider range of applications). The synergistic effect between the four maintains the normal operation of the electrode tube and is efficiently used in the detection and measurement of conductivity. The four-electrode method calculates conductivity by accurately measuring voltage and current. Through appropriate circuit configuration, the influence of wire resistance and contact resistance on the measurement results can be minimized, thereby ensuring the accuracy of the measurement and accurately reflecting the conductive properties of the material. Therefore, it is not affected by the length of the relevant connecting wires. Moreover, the first electrode sheet 3, the second electrode sheet 4, the third electrode sheet 5 and the fourth electrode sheet 6 are all made of titanium alloy material. On the one hand, the application of titanium alloy as electrode material is based on its excellent conductivity and corrosion resistance, and it has high efficiency and stability in conductivity detection applications; on the other hand, titanium alloy material has a lower cost than platinum material and is easier to process.

[0026] More preferably, the temperature sensor 7 is a circular hole patch type PT100 thermocouple temperature sensor, which has a good linear relationship between resistance value and temperature and has the advantage of a wide temperature measurement range. In addition, the platinum resistor installed inside it has good stability and repeatability, and can still maintain high measurement accuracy during long-term use. Platinum, as a temperature sensing element, has good chemical stability and mechanical strength, and can also operate stably for a long time in relatively harsh working environments. Circular hole patch type PT100 thermocouple temperature sensors are usually installed using threaded or flange mounting methods, which are simple to install and easy to maintain.

[0027] Specifically, the temperature sensor 7 is connected to a single-wire high-temperature long wire 8, which is connected to an external display instrument through the high-temperature long wire 8 to observe the detection data. The high-temperature long wire 8 is made of tinned copper wire, which has the advantages of anti-oxidation, high temperature resistance, good conductivity and improved wire performance, and can extend the service life of the high-temperature long wire 8. Its insulation resistance is 10 8 Ω or above, which can effectively protect circuit components and further reduce the occurrence of insulation material aging.

[0028] In the technical solution of this utility model, the four-electrode connection method is set, and the electrode sheets are made of titanium alloy materials. The combination of these two aspects is the technical key of this case. Figure 3 and Figure 4 The focus is on the components involved in the four-electrode connection method. With this four-terminal electrode method, the electric field can be adjusted by adjusting the voltage and frequency, thereby improving conductivity detection accuracy. For mounting components such as the tube body 1, housing 9, and terminal 10, those skilled in the art can perform conventional setup based on existing techniques. This application does not require any special requirements regarding model selection or combination.

[0029] In this way, the technical solution of the present invention is adopted, and the installation tube body 1 is directly connected to the pipeline to be tested through the TC chucks or pagoda heads at both ends. When the fluid passes through the pipeline, the first electrode piece 3 and the fourth electrode piece 6 (current injection electrodes) contact the liquid to be tested or other conductive materials, maintaining a certain distance; the second electrode piece 4 and the third electrode piece 5 (voltage measurement electrodes) contact the liquid to be tested or other conductive materials, and maintain a certain distance, ensuring that the distance between them and the current injection electrode is far enough to avoid the voltage generated by the current injection electrode being sensed by the measuring electrode and causing errors. Each electrode piece is connected to the measuring equipment, and finally the conductivity can be measured through the equipped electronic system.

[0030] From the above description, it can be found that compared with the prior art, after adopting the technical solution of the present invention, conductivity detection is performed through a four-electrode connection method, which not only avoids the limitation of wire length, but also separates current and voltage, reduces the error caused by the electrode, makes the measurement result more stable, and improves the accuracy of conductivity measurement; moreover, the four electrodes are all made of titanium alloy material, the manufacturing process is simple, can effectively avoid rust problems, and at the same time reduces the cost compared to traditional platinum electrodes; in addition, TC chucks or pagoda heads are used at both ends of the mounting tube body, which is not only easy to disassemble and assemble, but also can be adapted to a variety of pipeline installations; in addition, the mounting tube body and the outer shell are made of FDA-certified PP plastic material, which is light in weight and suitable for disposable use.

[0031] The above describes the technical solution, working process and implementation effect of the utility model in detail. It should be noted that what is described is only a typical example of the utility model. In addition, the utility model can also have many other specific implementation methods. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the utility model.

Claims

1. A disposable four-electrode conductivity detection device that is easy to assemble and disassemble, comprising a hollow mounting tube (1), wherein the mounting tube (1) is movably connected to a pipeline joint (2) at both left and right ends along its length direction, and characterized in that: An electrode tube with a temperature sensor (7) is sleeved inside the mounting tube body (1), and four electrodes are evenly distributed along the length of the electrode tube. One end of the four electrodes is connected to a DC power supply through a wire winding, and the other end is connected to the device to be measured. The four electrodes are all located in a shell (9), and the shell (9) is provided on the mounting tube body (1). The four electrodes include a second electrode sheet (4) and a third electrode sheet (5) located on the inner side for measuring voltage, and a first electrode sheet (3) and a fourth electrode sheet (6) located on the outer side for measuring current.

2. The disposable four-electrode conductivity detection device that is easy to assemble and disassemble according to claim 1, characterized in that: The pipeline joint (2) is a TC chuck joint or a pagoda joint.

3. The disposable four-electrode conductivity detection device that is easy to assemble and disassemble according to claim 1, characterized in that: The four electrodes and the mounting tube body (1) are formed by insert injection molding.

4. The disposable four-electrode conductivity detection device that is easy to assemble and disassemble according to claim 1, characterized in that: The first electrode sheet (3), the second electrode sheet (4), the third electrode sheet (5) and the fourth electrode sheet (6) are all made of titanium alloy material.

5. The disposable four-electrode conductivity detection device that is easy to assemble and disassemble according to claim 1, characterized in that: The temperature sensor (7) is a round hole patch type PT100 thermocouple temperature sensor.

6. The disposable four-electrode conductivity detection device that is easy to assemble and disassemble according to claim 5, characterized in that: The temperature sensor (7) is connected to a single-wire high-temperature long wire (8), and is connected to an external display instrument via the high-temperature long wire (8).

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