A wide range fast response conductivity test electrode structure

Abstract

The utility model provides a kind of wide-range fast-response conductivity test electrode structure, including positive, negative two electrode pieces, for installing electrode piece fixed block, the fixed block is equipped with flow channel hole, two electrode pieces are equipped in the two sides of the central axis of flow channel hole, the fixed block corresponding place is equipped with the through slot for installing two electrode pieces, test gap for testing liquid flow between two electrode pieces is equipped with intercommunication flow channel hole, the electrode piece and fixed block between still be equipped with limit structure. The utility model wide-range, response speed is fast.

Description

Technical Field

[0001] This utility model relates to the field of conductivity testing technology, and in particular to a conductivity testing electrode structure with a wide range of fast response. Background Technology

[0002] TOC (Total Organic Carbon) is an important indicator for measuring the organic matter content in water for injection and is one of the universally accepted standards worldwide. A lower TOC content indicates less organic matter in the water for injection and higher safety for human health. Typically, the TOC content is obtained by measuring the conductivity of the solution and integrating the results. There is a demand in the market for both high-concentration and low-concentration TOC testing.

[0003] Conductivity measurements are typically performed by applying a potential between two electrodes immersed in a water sample. The conductivity of the sample is determined by measuring the applied voltage and the resulting current intensity. This measurement method is affected by the geometry of the conductivity cell, the total effective surface area (S) of the electrodes, and the distance between the electrodes (L). The latter two parameters define the conductivity cell constant (K): K = L / S. Theoretically, for a given voltage, the larger the surface area of ​​the electrodes (larger S) or the smaller the electrode spacing (smaller L), the greater the current intensity produced, and the more accurate the current measurement. This means that a smaller conductivity cell constant K value is generally more advantageous for accurate measurements of low-conductivity solutions. However, electrodes with smaller K values ​​have a relatively narrow applicable measurement range, mainly targeting the low conductivity range. For high-conductivity solutions, small K-value electrodes are prone to polarization effects and other problems, leading to inaccurate measurements. Therefore, to cover a wide range of TOC detection needs from low to high concentrations, the current common practice is to use instruments with different K-value electrodes (i.e., different detection ranges). This operation is relatively cumbersome, increasing the cost and complexity of use. Utility Model Content

[0004] To address the problems of the prior art, this invention provides a highly sensitive conductivity testing structure that increases the K value, expands the conductivity detection range, and is compatible with the detection of water with both low and high conductivity.

[0005] The technical solution adopted is as follows: A wide-range, fast-response conductivity testing electrode structure includes two electrode plates, positive and negative, and a fixing block for mounting the electrode plates. The fixing block has a flow channel hole, and the two electrode plates are located on both sides of the central axis of the flow channel hole. The fixing block has corresponding slots for mounting the two electrode plates, and a test gap is provided between the two electrode plates to connect the flow channel hole and allow the test liquid to flow through. A limiting structure is also provided between the electrode plates and the fixing block.

[0006] Furthermore, the length of the test gap along the X-axis is greater than or equal to the side length of the flow channel hole along the X-axis; the length of the electrode sheet in the Y-axis direction is greater than or equal to the side length of the flow channel hole along the Y-axis.

[0007] Furthermore, the fixing block can be integrally set, or the fixing block includes two mating blocks with mating surfaces of the two blocks touching each other, forming a flow channel hole for the test liquid to flow through and a through groove for installing two electrode plates at the touching point.

[0008] Furthermore, both ends of the fixed block are provided with flow channel ends, including a first flow channel end and a second flow channel end.

[0009] Furthermore, the first flow channel end is connected to the inlet connector, and the second flow channel end is connected to the outlet connector.

[0010] Furthermore, the cross-section of the flow channel hole is square, meaning that the lengths of the four sides of the flow channel hole are all equal.

[0011] Furthermore, a temperature sensor is provided at the end of the flow channel.

[0012] Furthermore, the limiting structure includes a limiting plate located at the end of the electrode sheet, and the fixing block has a groove that mates with the limiting plate.

[0013] Furthermore, the groove is provided in two places, with the two grooves respectively located at the openings at both ends of the through groove, and the two grooves located on the same side or different sides of the through groove.

[0014] Furthermore, the side length of the cross-section of the flow channel hole is 0.4 mm.

[0015] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention provides a wide-range, fast-response conductivity testing electrode structure. The electrode is fixed by combining the electrode sheet with a fixing block, making installation and disassembly convenient and allowing for quick replacement. A small flow channel hole is set in the center of the fixing block; under a constant water flow rate, the less water flows through and the shorter the flow time, the faster the response speed. By reducing the facing area of ​​the electrode sheet and increasing the K value, the conductivity detection range is expanded, making it compatible with both low and high conductivity water, resulting in a wider testing range. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a schematic diagram showing the disassembly of the electrode sheet and the fixing block; Figure 3 This is a disassembly diagram of the structure of this utility model; Figure 4This is a side view of the present invention; Figure 5 for Figure 4 A cross-sectional view facing direction AA; Figure 6 for Figure 5 Enlarged view of point a; wherein, electrode sheet 1, fixing block 2, flow channel hole 3, flow channel end 4, first flow channel end 401, second flow channel end 402, inflow end connector 5, outflow end connector 6, through groove 7, temperature sensor 8, liquid inlet pipe 9, liquid outlet pipe 10, limiting structure 11, limiting plate 1101, groove 1102. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments.

[0018] refer to Figure 1-6 A wide-range, fast-response conductivity testing electrode structure includes two electrode plates 1 (positive and negative) and a fixing block 2 for mounting the electrode plates. The fixing block 2 has a flow channel hole 3. The two electrode plates 1 are located on opposite sides of the central axis of the flow channel hole 3. Corresponding slots 7 are provided on the fixing block 2 for mounting the two electrode plates. A test gap is provided between the two electrode plates, connecting to the flow channel hole 3, allowing the test liquid to flow through. A limiting structure 11 is also provided between the electrode plates and the fixing block 2. The test gap of the electrode plate 1 connects to the flow channel hole 3, meaning that the test liquid enters from the flow channel hole 3 and passes through the test gap, allowing the electrode plate 1 to test the conductivity of the liquid. The length of the test gap along the X-axis is greater than or equal to the side length of the flow channel hole along the X-axis; the length of the electrode plate along the Y-axis is greater than or equal to the side length of the flow channel hole along the Y-axis. Preferably, the length of the test gap along the X-axis is equal to the side length of the flow channel hole along the X-axis; the length of the electrode plate along the Y-axis is equal to the side length of the flow channel hole along the Y-axis.

[0019] The limiting structure 11 includes a limiting plate 1101 located at the end of the electrode piece 1, and a groove 1102 on the fixing block 2 that mates with the limiting plate 1101. The limiting structure 11 restricts the depth of the electrode piece inserted into the through groove. The limiting plate 1101 engages with the groove 1102 on the fixing block 2, thus limiting the electrode piece 1. The limiting plate 1101 facilitates the insertion and removal of the electrode piece 1, and manually pulling the limiting plate 1101 facilitates the installation and removal of the electrode piece 1. Two grooves are respectively located at the openings at both ends of the through groove, corresponding to the limiting plates 1101 of the two electrode pieces 1. The two grooves may be located on the same side or different sides of the through groove. In this embodiment, the two grooves are located on different sides of the through groove.

[0020] Preferably, the cross-section of the flow channel hole 3 is square, that is, the lengths of the four sides of the flow channel hole 3 are all equal.

[0021] In this embodiment, the side length of the cross-section of the flow channel hole is 0.4 mm, and the length of the two electrode plates 1 along the Y-axis, i.e., the thickness of the electrode plates 1, is also 0.4 mm. The height of the fixing block 2 can be adjusted according to actual needs, i.e., the length of the entire flow channel hole can be adjusted according to actual needs. In this embodiment, the height of the electrode plates is 10 mm, so the test volume is: 0.4 × 0.4 × 10 = 1.6 mm³ = 1.6 uL. In the prior art, the test volume of the electrode is more than 100 uL. Compared with the test volume of conventional electrode settings, this utility model greatly reduces the test volume by inserting the electrode plates into the fixing block. Under the condition of constant flow rate, the smaller the volume, the less water flows, the shorter the time it takes to flow through the flow channel hole, and the shorter the response time of the electrode is shortened by 50 times.

[0022] Furthermore, the reduced test volume is achieved by altering the cross-sectional area of ​​the flow channel holes, rather than decreasing their length. Based on the formula for the cell conductivity constant, K = L / A (where L is the distance between the electrode plates and A is the area of ​​the opposing electrode plates), the cell conductivity constant in this embodiment can be calculated as: K = 0.04cm / (0.04cm × 1cm) = 1cm -1 The cell constant of an electrode determines its detection accuracy and range. Electrodes with different K values ​​are suitable for measurements of different conductivity ranges; the electrode constant for a conventional electrode is K=0.01.

[0023] Preferably, the K value is controlled within the range of 0.8 to 1.5 by controlling the cross-sectional size of the flow channel hole and the size of the electrode sheet. In this embodiment, the K value is equal to 1, resulting in a wider detection range.

[0024] The fixing block can be integrally set, or the fixing block includes two mating blocks with mating surfaces of the two blocks touching each other, forming a flow channel hole for the test liquid to flow through and a through groove for installing two electrode plates at the touching point.

[0025] This utility model provides a way for the fixing block 2 to be snapped into the electrode plate 1, which facilitates the installation and removal of the electrode plate. It can not only fix the electrode plate 1, but also minimize the volume of the flow channel hole and improve the response speed of the electrode.

[0026] The fixed block 2 has flow channel ends 4 at both ends, including a first flow channel end 401 and a second flow channel end 402. The first flow channel end 401 is connected to the inlet connector 5, and the second flow channel end 402 is connected to the outlet connector 6. The inlet connector 5 is provided with an inlet pipe 9 for the test liquid to flow in, and the outlet connector 6 is provided with an outlet pipe 10 for the test liquid to flow out. The test liquid flows from the inlet pipe 9 of the inlet connector 5, through the first flow channel end 401, into the flow channel hole 3 of the fixed block 2, and then flows out through the second flow channel end 402 from the outlet pipe 10 of the outlet connector 6.

[0027] A temperature sensor 8 is provided on the flow channel end 4. The temperature sensor 8 is located on the first flow channel end 401 or the second flow channel end 402. In this embodiment, the temperature sensor 8 is provided on the first flow channel end 401. The temperature sensor is provided to compensate for the conductivity with the actual temperature, thereby improving the detection accuracy. The above description is only an optional embodiment of this utility model and does not limit the patent scope of this utility model. All equivalent structural transformations made under the inventive concept of this utility model using the content of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this utility model.

Claims

1. A wide-range fast-response conductivity test electrode structure comprising two electrode pads (1) of positive and negative polarity, a fixing block (2) for mounting the electrode pads, characterized in that: The fixing block (2) is provided with a flow channel hole (3), and two electrode plates (1) are provided on both sides of the central axis of the flow channel hole (3). The fixing block (2) is provided with a through groove (7) for installing the two electrode plates. The two electrode plates are provided with a connecting flow channel hole (3) and a test gap for the test liquid to flow through. The electrode plates and the fixing block (2) are also provided with a limiting structure (11).

2. The wide range, fast response conductivity test electrode structure of claim 1, wherein: The length of the test gap along the X-axis is greater than or equal to the side length of the flow channel hole along the X-axis; the length of the electrode sheet along the Y-axis is greater than or equal to the side length of the flow channel hole along the Y-axis.

3. The conductivity testing electrode structure with wide-range fast response as described in claim 1, characterized in that: The fixing block (2) can be integrally set, or the fixing block (2) includes two mating blocks with mating surfaces of the two blocks touching each other, forming a flow channel hole (3) for the test liquid to flow through and a through groove (7) for installing two electrode plates at the touching point.

4. The conductivity testing electrode structure with wide-range fast response as described in claim 1, characterized in that: The fixed block (2) is provided with flow channel ends (4) at both ends, including a first flow channel end (401) and a second flow channel end (402).

5. The wide-range fast-response conductivity testing electrode structure as described in claim 4, characterized in that: The first flow channel end (401) is connected to the inflow end connector (5), and the second flow channel end (402) is connected to the outflow end connector (6).

6. The wide range, fast response conductivity test electrode structure of claim 1, wherein: The cross-section of the flow channel hole (3) is square, that is, the lengths of the four sides of the flow channel hole (3) are all equal.

7. The wide range, fast response conductivity test electrode structure of claim 4, wherein: A temperature sensor (8) is provided on the flow channel end (4).

8. The wide range, fast response conductivity test electrode structure of claim 1, wherein: The limiting structure (11) includes a limiting plate (1101) located at the end of the electrode sheet (1), and the fixing block (2) is provided with a groove (1102) that cooperates with the limiting plate (1101).

9. The wide range, fast response conductivity test electrode structure of claim 8, wherein: The groove is provided in two places, and the two grooves are respectively located at the openings at both ends of the through groove. The two grooves are located on the same side or different sides of the through groove.

10. The wide range, fast response conductivity test electrode structure of claim 6, wherein: The side length of the cross-section of the flow channel hole is 0.4 mm.

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