A multifunctional water quality detection pen

Abstract

The present invention discloses a multifunctional water quality detection pen, which relates to the field of water quality detection and includes a pen body, a detection component, and a TDS value correction system of the water quality detection pen. The detection end of the pen body is provided with an integrally formed end protective shell, and a partition is fixedly provided on the inner wall of the middle portion of the end protective shell. The multifunctional water quality detection pen can prevent the conductivity of the glass membrane bulb of the pH electrode from affecting the current of the TDS probe during operation, thereby ensuring the calibration accuracy of the TDS value of the detection pen. It is also beneficial to ensure that the conductive area of the produced TDS probes is the same. At the same time, it can also make the conductive path between the two conductive surfaces relatively stable, so that the conductivity measured by the TDS probe is also relatively stable, further ensuring the calibration accuracy of the TDS value of the water quality detection pen. In addition, through the TDS value correction system of the water quality detection pen and the correction method of the TDS value correction system, the influence of the pH value of the water being tested on the initial TDS value is corrected, thereby ensuring the calibration accuracy of the TDS value.

Description

Technical Field

[0001] The invention relates to the technical field of water quality detection, in particular to a multifunctional water quality detection pen. Background Art

[0002] The quality of drinking water is closely related to human health. With the development of social economy, scientific progress and the improvement of people's living standards, people's requirements for the quality of drinking water are constantly increasing, and the drinking water quality standards are also constantly developing and improving accordingly. The popularity of household water quality testing pens is also increasing.

[0003] The test items of the multifunctional water quality test pen for domestic water generally include TDS value, pH value and temperature value:

[0004] TDS value is generally used to measure the purity of purified water. The TDS value represents the content of dissolved impurities in water, which refers to the concentration of total dissolved solids in water. The unit is milligrams per liter (mg / L). It indicates how many milligrams of dissolved solids are dissolved in 1 liter of water. It mainly reflects the concentration of ions such as calcium ions, magnesium ions, sodium ions and potassium ions in water, and has a good correspondence with the hardness and conductivity of water. The smaller the TDS value, the lower the concentration of ions such as calcium ions, magnesium ions, sodium ions and potassium ions in water, and the lower the conductivity. Therefore, existing water quality test pens use TDS probes and sampling circuits to obtain the conductivity of water to calibrate the TDS value of water;

[0005] The pH value is the acidity and alkalinity of water, also known as the hydrogen ion concentration index. Existing water quality testing pens use the pH electrode to produce a primary battery reaction with hydrogen ions in the water, and then generate the pH value information of the water based on the size of the electromotive force generated by the primary battery reaction and combined with the sampling circuit.

[0006] Based on the existing technology of the multifunctional water quality detection pen, the following technical problems still exist:

[0007] 1. When the pH electrode is placed in water for testing, a reference voltage must be provided to the pH reference electrode first. The reference electrode and the test electrode (glass membrane bulb) undergo ion exchange with the liquid being tested, and a voltage difference will be generated between the pH test probe and the reference electrode. Different voltage differences correspond to different pH values. During the test, the liquid being tested and the glass membrane bulb of the pH electrode need to undergo ion exchange. Therefore, the glass membrane bulb itself has a certain conductivity. In current portable water quality test pens, the distance between the glass membrane bulb of the pH electrode and the TDS probe is relatively close, and they are in the same detection cavity. Therefore, when the pH electrode and TDS probe are immersed in water for testing, the conductivity of the glass membrane bulb itself will affect the current size of the TDS probe when it is working, thereby having a certain impact on the conductivity of the water, and further affecting the calibration accuracy of the sampling circuit for the TDS value;

[0008] 2. Regarding the TDS probe, the TDS probe of the current water quality test pen is composed of two metal needles. A DC voltage is applied to the metal needles through a sampling circuit, and the conductivity of the water is obtained according to the current in the circuit to calibrate the TDS value of the water. However, due to the limitations of the TDS probe production process, it is difficult to ensure that the area of the exposed surface of the TDS probe is the same, so it is difficult to ensure that the contact area between the TDS probe and the water is the same. Moreover, when the metal needles are inserted into the water, the conductive paths of the two metal needles in the water are divergent and messy, so the conductivity of the water measured by the two metal needles is not stable, which affects the calibration accuracy of the sampling circuit for the TDS value.

[0009] 3. Currently, the multi-functional water quality test pen uses the conductivity of water as a reference object in the process of calibrating the TDS value of water. The conductivity of water is not only related to the concentration of total dissolved solids in water, but also to the pH value of water, that is, the concentration ratio of hydrogen ions and hydroxide ions in water. Through experiments, it is known that when the pH value of water is greater than 7, the higher the pH value, the higher the conductivity. When the pH value of water is less than 7, the lower the pH value, the higher the conductivity. The conductivity gain value caused by the concentration difference between hydrogen ions and hydroxide ions should not be included in the TDS value. Therefore, the pH value of water will have a certain impact on the conductivity, thereby having a certain impact on the TDS value calibrated by the water quality test pen. It can be seen that in the process of calibrating the TDS value of water, the initially calibrated TDS value needs to be corrected again according to the pH value of water to ensure the calibration accuracy of the TDS value.

[0010] To this end, we provide a multifunctional water quality testing pen to solve the above problems. Summary of the Invention

[0011] The purpose of the present invention is to make up for the technical deficiencies in the above-mentioned technical problems 1, 2 and 3, and to provide the following technical solutions:

[0012] A multifunctional water quality testing pen, comprising a pen body, a testing assembly, and a TDS value correction system for the water quality testing pen. The testing end of the pen body is provided with an integrally formed end protection shell. A partition is fixedly provided on the inner wall of the middle portion of the end protection shell, forming two testing cavities between the inner cavity of the end protection shell and the testing end of the pen body through the partition.

[0013] The detection assembly includes a pH electrode, a temperature sensor and a TDS probe fixedly mounted on the detection end of the pen body. The glass membrane bulb of the pH electrode and the TDS probe are respectively located in two detection cavities. This can prevent the conductivity of the glass membrane bulb of the pH electrode itself from affecting the current of the TDS probe during operation, thereby ensuring the calibration accuracy of the TDS value of the detection pen.

[0014] The TDS probe includes an insulating block and a conductive column 1 and a conductive column 2 fixedly embedded in the insulating block. The opposite sides of the conductive column 1 and the conductive column 2 are fixedly connected to the conductive block. The outer surfaces of the conductive column 1, the conductive column 2 and the conductive block are coated with an insulating coating. The material of the insulating coating is preferably epoxy resin or polyamide-imide. The opposite sides of the two conductive blocks are polished to remove the insulating coating to form a smooth conductive surface, and the conductive surface is gold-plated to form a gold-plated surface.

[0015] The relative cross-sectional areas of the two conductive blocks are the same, the areas of the conductive surfaces of the two opposite sides of the conductive blocks after deep polishing are equal to the areas of the conductive surfaces after shallow polishing, and the two conductive blocks can be standard cubes, cuboids or cylinders.

[0016] In the structure of the TDS probe, since the outer surfaces of conductive pillars 1, 2, and the conductive block are all coated with an insulating coating, when the probe is inserted into water, a conductive circuit is formed in the water only through the two conductive surfaces. In addition, the conductive surface is formed by grinding off the insulating coating on the side of one of the conductive blocks. As long as the cross-sectional areas of the two conductive blocks are the same, the areas of the two conductive surfaces can be guaranteed to be the same. At the same time, the conductive path between the two conductive surfaces can also be made relatively stable. Therefore, the conductivity measured by the TDS probe is also relatively stable, which can further ensure the calibration accuracy of the TDS value of the water quality test pen.

[0017] The TDS value correction system includes a temperature calibration unit, a pH value calibration unit, a TDS value preliminary calibration unit, a TDS value correction calibration unit, a data processing module, and a correction method of the TDS value correction system. The correction method is as follows:

[0018] Ⅰ. Generate the temperature calibration value of the tested water through the temperature sensor and the temperature calibration unit;

[0019] II. Generate the TDS sampling value of the water being tested through the TDS probe and the TDS value preliminary calibration unit, perform temperature compensation according to the temperature calibration value, and then generate the initial TDS value of the water being tested, marked as TDS△a;

[0020] Ⅲ. Generate the pH sampling value of the water being tested through the pH calibration unit and the pH electrode, and perform temperature compensation according to the temperature calibration value to generate the pH calibration value of the water being tested, which is marked as pH△a;

[0021] IV. The TDS value correction calibration unit calculates the TDS revised value of the tested water according to the pH calibration value PH△a generated by the pH calibration unit and the initial TDS value TDS△a generated by the TDS value preliminary calibration unit 9, and marks it as TDS△b. The specific conversion relationship is as follows:

[0022] When the pH calibration value PH△a=7,

[0023] Then the TDS revised value TDS△b=TDS initial value TDS△a;

[0024] When the pH calibration value PH△a<7 or the pH calibration value PH△a>7,

[0025] When the pH calibration value PH△a is a variable,

[0026] TDS revised value TDS△b=TDS initial value TDS△a-K;

[0027] Among them, K is the variable coefficient of the influence of the pH calibration value PH△a on the TDS initial value TDS△a, that is, the gain value caused to the TDS initial value TDS△a due to the influence of the pH value of the tested water. When the pH calibration value PH△a changes, the K value will also change. The pH calibration value PH△a is obtained by using the pH value calibration unit 8, and the variable coefficient K is obtained through experimental data. A data relationship table corresponding to the pH calibration value PH△a as a variable and the K value is prepared. Finally, the TDS value correction calibration unit 10 is used to generate the TDS revised value TDS△b according to the data relationship table and the above-mentioned conversion relationship.

[0028] By using the correction method of the TDS value correction system, the TDS value correction calibration unit 10 and the correction method of the TDS value correction system are used to correct the influence of the pH value of the detected water on the initial TDS value, thereby ensuring the calibration accuracy of the TDS value.

[0029] The above-mentioned method for determining the K value is as follows:

[0030] First of all, it should be noted that the TDS value refers to the total dissolved solids, and the unit of measurement is milligrams per liter (mg / L). It indicates how many milligrams of dissolved solids are dissolved in 1 liter of water, and its value is positively correlated with the conductivity of the solution;

[0031] The pH value is an index of the hydrogen ion concentration in a solution. Generally, the pH value of a solution ranges from 0 to 14. When the hydrogen ion concentration in the solution = the hydroxide ion concentration, the pH value is 7, and the solution is neutral. When the hydrogen ion concentration in the solution is greater than the hydroxide ion concentration, the pH value is less than 7, and the solution is acidic. When the hydrogen ion concentration in the solution is less than the hydroxide ion concentration, the pH value is greater than 7, and the solution is alkaline.

[0032] Through experiments, we know that when the pH value is 7 and the solution is neutral, the hydrogen ions and hydroxide ions in the solution will not affect the conductivity of the liquid. At this time, the conductivity of the solution only depends on the concentration of dissolved solids in the solution. Therefore, when the pH calibration value PH△a=7, the TDS revised value TDS△b=TDS initial value TDS△a;

[0033] Through experiments, we know that when the pH value of water is greater than 7, the higher the pH value, the higher the conductivity. When the pH value of water is less than 7, the smaller the pH value, the higher the conductivity.

[0034] Based on the above experimental conclusions, under standard experimental conditions, the K value can be formulated through the following operation examples:

[0035] Step A: Take 0.5 grams of available solid and dissolve it completely in 999.5 grams of pure water to prepare a 1000 gram test sample. At this time, the total soluble solid content of the test sample is 500 milligrams per liter (mg / L), that is, the TDS correction value of the test sample is TDSΔb = 500. It should be noted that the weight values of the soluble solid and pure water are quantitative. The sample solution prepared by dissolving the soluble solid in pure water is acidic or alkaline. Soluble solids can be selected from sodium bisulfate, sodium hydroxide, potassium hydroxide, etc. To achieve different pH values of the solution, different types and proportions of soluble solids need to be selected to obtain more detailed experimental data.

[0036] Step B: Measure the pH calibration value PH△a of the sample solution and set it as y. Use the TDS probe and the TDS value preliminary calibration unit to preliminarily calibrate the sample solution's TDS preliminary value TDS△a. Since the solution is acidic or alkaline, its conductivity increases, so the measured TDS preliminary value TDS△a>TDS revised value TDS△b. Set the TDS preliminary value TDS△a of the tested water generated by the TDS probe and the TDS value preliminary calibration unit to be f. That is, when the pH calibration value PH△a of the sample solution is y, the K value is f-500.

[0037] By combining the operating theories of steps A and B, adjusting the variables of the experimental operation, that is, selecting soluble solids of different types and proportions to make the pH value of the sample solution different, a data relationship table corresponding to the pH calibration value PH△a and K value can be obtained.

[0038] As mentioned above, in the TDS value correction system, the temperature calibration value of the tested water is generated by the temperature calibration unit, the initial TDS value of the tested water is generated by the TDS value preliminary calibration unit, and the TDS revised value is generated by the TDS value correction calibration unit. All of them are analyzed and processed by the data processing module and then fed back to the display unit of the water quality testing pen for display.

[0039] Furthermore, two first water immersion grooves are provided on the upper surface of the end protective shell, and the two first water immersion grooves are respectively located at the top of the two detection cavities; two second water immersion grooves are provided on the bottom surface of the end protective shell, and the two second water immersion grooves are respectively located at the bottom of the two detection cavities; and water immersion holes are provided on the left and right sides of the end protective shell.

[0040] The multifunctional water quality detection pen has the following beneficial effects:

[0041] 1. The present invention forms two detection cavities between the inner cavity of the end protective shell and the detection end of the pen body through the end protective shell provided at the detection end of the pen body and the partition fixedly provided on the inner wall of the end protective shell. The glass membrane bulb of the pH electrode and the TDS probe are respectively arranged in the two detection cavities. In this way, the conductivity of the glass membrane bulb of the pH electrode itself can be prevented from affecting the current of the TDS probe during operation, thereby ensuring the calibration accuracy of the TDS value of the detection pen.

[0042] 2. In the structure of the TDS probe of the present invention, conductive blocks are fixedly connected to the opposite sides of the conductive pillar 1 and the conductive pillar 2, and the outer surfaces of the conductive pillar 1, the conductive pillar 2 and the conductive block are coated with an insulating coating. Then, the opposite sides of the two conductive blocks are polished to remove the insulating coating to form a smooth conductive surface, which can easily ensure that the areas of the two conductive surfaces are the same. At the same time, it can also make the conductive path between the two conductive surfaces relatively stable, so that the conductivity measured by the TDS probe is also relatively stable, which can further ensure the calibration accuracy of the TDS value of the water quality detection pen.

[0043] 3. The present invention uses the TDS value correction system of the water quality test pen and the correction method of the TDS value correction system to correct the influence of the pH value of the tested water on the initial TDS value, thereby ensuring the calibration accuracy of the TDS value.

[0044] Other advantages, objects and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the pen body of the present invention;

[0046] Figure 2 Schematic diagram of the structure of the detection end portion of the pen body of the present invention;

[0047] Figure 3 Schematic diagram of the three-dimensional structure of the TDS probe of the present invention;

[0048] Figure 4 2. It is a cross-sectional view of the internal structure of the TDS probe of the present invention;

[0049] Figure 5 System diagram of the system for correcting the TDS value of the water quality test pen;

[0050] Figure 6 A diagram illustrating a method for correcting a TDS value correction system according to the present invention;

[0051] Figure 7 This is a relationship diagram of some experimental data of the initial TDS value, revised TDS value and pH value in the present invention.

[0052] Figure 8 This is a diagram showing the relationship between some experimental data of pH value and K value in the present invention.

[0053] In the picture:

[0054] 1. Pen body;

[0055] 2. End shield; 21. First immersion tank; 22. Second immersion tank; 23. Immersion hole;

[0056] 3. Partition; 4. pH electrode; 5. Temperature sensor;

[0057] 6. TDS probe; 61. Insulation block; 62. Conductive column 1; 63. Conductive column 2; 64. Conductive block; 65. Insulation coating; 66. Conductive surface;

[0058] 7. Temperature calibration unit; 8. pH value calibration unit; 9. TDS value preliminary calibration unit; 10. TDS value correction calibration unit; 11. Data processing module. DETAILED DESCRIPTION

[0059] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0060] See also Figure 1-6 The present invention provides a technical solution: a multifunctional water quality testing pen, comprising a pen body 1, a testing component, and a TDS value correction system for the water quality testing pen. The testing end of the pen body 1 is provided with an integrally formed end protective shell 2, and a partition 3 is fixedly provided on the inner wall of the middle portion of the end protective shell 2. The partition 3 forms two testing cavities between the inner cavity of the end protective shell 2 and the testing end of the pen body 1;

[0061] Please pay attention to Figure 2 The detection component includes a pH electrode 4, a temperature sensor 5 and a TDS probe 6 fixedly installed at the detection end of the pen body 1. The temperature sensor 5 is located in any detection cavity, and the glass membrane bulb of the pH electrode 4 and the TDS probe 6 are located in two detection cavities respectively. This can prevent the conductivity of the glass membrane bulb of the pH electrode 4 from affecting the current of the TDS probe 6 during operation, thereby ensuring the calibration accuracy of the TDS value of the detection pen.

[0062] Please pay attention to Figure 3 and Figure 4 The TDS probe 6 includes an insulating block 61 and a conductive column 1 62 and a conductive column 2 63 fixedly embedded in the insulating block 61. The opposite sides of the conductive column 1 62 and the conductive column 2 63 are fixedly connected to a conductive block 64. The outer surfaces of the conductive column 1 62, the conductive column 2 63 and the conductive block 64 are coated with an insulating coating 65. The material of the insulating coating 65 is preferably epoxy resin or polyamide-imide. The opposite sides of the two conductive blocks 64 are polished to remove the insulating coating 65 to form a smooth conductive surface 66. The conductive surface 66 is gold-plated to form a gold-plated surface to prevent the conductive surface 66 from being corroded.

[0063] The relative cross-sectional areas of the two conductive blocks 64 are the same. The areas of the conductive surfaces 66 of the opposite sides of the two conductive blocks 64 after deep grinding are equal to the areas of the conductive surfaces 66 after shallow grinding. The two conductive blocks 64 can be standard cubes, rectangular blocks or cylinders.

[0064] In the structure of the TDS probe 6, since the outer surfaces of the conductive column 1 62, the conductive column 2 63 and the conductive block 64 are all coated with an insulating coating 65, when the probe is inserted into water, a conductive circuit is formed in the water only through the two conductive surfaces 66. In addition, the conductive surface 66 is formed by grinding off the insulating coating 65 on one side of the conductive block 64. As long as the cross-sectional areas of the two conductive blocks 64 are the same, the areas of the two conductive surfaces 66 can be the same. At the same time, the conductive path between the two conductive surfaces 66 can also be made relatively stable. Therefore, the conductivity measured by the TDS probe 6 is also relatively stable, which can further ensure the calibration accuracy of the TDS value of the water quality detection pen.

[0065] For further information, please refer to Figure 2 The top surface of the end housing 2 is provided with two first immersion grooves 21, located at the tops of the two detection cavities. The bottom surface of the end housing 2 is provided with two second immersion grooves 22, located at the bottoms of the two detection cavities. Immersion holes 23 are provided on both the left and right sides of the end housing 2. The first immersion grooves 21, second immersion grooves 22, and immersion holes 23 provided on the end housing 2 facilitate rapid entry of the monitored water into the detection cavities within the end housing 2, thereby improving detection speed.

[0066] Please pay attention to Figure 5 and Figure 6 The TDS value correction system includes a temperature calibration unit 7, a pH value calibration unit 8, a TDS value preliminary calibration unit 9, a TDS value correction calibration unit 10, a data processing module 11 and a correction method of the TDS value correction system. The correction method is as follows:

[0067] Ⅰ. Generate a temperature calibration value of the water being tested through the temperature sensor 5 and the temperature calibration unit 7;

[0068] II. Generate a TDS sampling value of the water being tested through the TDS probe 6 and the TDS value preliminary calibration unit 9, perform temperature compensation according to the temperature calibration value, and then generate a preliminary TDS value of the water being tested, marked as TDS△a;

[0069] III. Generate a pH sampling value of the water being tested through the pH calibration unit 8 and the pH electrode 4, and perform temperature compensation according to the temperature calibration value to generate a pH calibration value of the water being tested, which is marked as pH△a;

[0070] IV. The TDS value correction calibration unit 10 converts the pH calibration value PH△a generated by the pH value calibration unit 8 and the initial TDS value TDS△a generated by the TDS value preliminary calibration unit 9 into a TDS revised value of the tested water, which is marked as TDS△b. The specific conversion relationship is as follows:

[0071] When the pH calibration value PH△a=7,

[0072] Then the TDS revised value TDS△b=TDS initial value TDS△a;

[0073] When the pH calibration value PH△a<7 or the pH calibration value PH△a>7,

[0074] When the pH calibration value PH△a is a variable,

[0075] TDS revised value TDS△b=TDS initial value TDS△a-K;

[0076] Among them, K is the variable coefficient of the influence of the pH calibration value PH△a on the TDS initial value TDS△a, that is, the gain value caused to the TDS initial value TDS△a due to the influence of the pH value of the tested water. When the pH calibration value PH△a changes, the K value will also change. The pH calibration value PH△a is obtained by using the pH value calibration unit 8, and the variable coefficient K is obtained through experimental data. A data relationship table corresponding to the pH calibration value PH△a as a variable and the K value is prepared. Finally, the TDS value correction calibration unit 10 is used to generate the TDS revised value TDS△b according to the data relationship table and the above-mentioned conversion relationship.

[0077] By using the correction method of the TDS value correction system, the TDS value correction calibration unit 10 and the correction method of the TDS value correction system are used to correct the influence of the pH value of the detected water on the initial TDS value, thereby ensuring the calibration accuracy of the TDS value.

[0078] The above-mentioned method for determining the K value is as follows:

[0079] First of all, it should be noted that the TDS value refers to the total dissolved solids, and the unit of measurement is milligrams per liter (mg / L). It indicates how many milligrams of dissolved solids are dissolved in 1 liter of water, and its value is positively correlated with the conductivity of the solution;

[0080] The pH value is an index of the hydrogen ion concentration in a solution. Generally, the pH value of a solution ranges from 0 to 14. When the hydrogen ion concentration in the solution = the hydroxide ion concentration, the pH value is 7, and the solution is neutral. When the hydrogen ion concentration in the solution is greater than the hydroxide ion concentration, the pH value is less than 7, and the solution is acidic. When the hydrogen ion concentration in the solution is less than the hydroxide ion concentration, the pH value is greater than 7, and the solution is alkaline.

[0081] Through experiments, we know that when the pH value is 7 and the solution is neutral, the hydrogen ions and hydroxide ions in the solution will not affect the conductivity of the liquid. At this time, the conductivity of the solution only depends on the concentration of dissolved solids in the solution. Therefore, when the pH calibration value PH△a=7, the TDS revised value TDS△b=TDS initial value TDS△a;

[0082] Through experiments, we know that when the pH value of water is greater than 7, the higher the pH value, the higher the conductivity. When the pH value of water is less than 7, the smaller the pH value, the higher the conductivity.

[0083] Based on the above experimental conclusions, under standard experimental conditions, the K value can be formulated through the following operation examples:

[0084] Step A: Take 0.5 grams of available solid and dissolve it completely in 999.5 grams of pure water to prepare a 1000 gram test sample. At this time, the total soluble solid content of the test sample is 500 mg / L mg / L, that is, the TDS correction value of the test sample is TDS Δb = 500. It should be noted that the weight values of the soluble solid and pure water are both quantitative. The sample solution prepared by dissolving the soluble solid in pure water is acidic or alkaline. Soluble solids can be selected from sodium bisulfate, sodium hydroxide, potassium hydroxide, etc. In order to achieve different pH values of the solution, different types and proportions of soluble solids need to be selected to obtain more detailed experimental data;

[0085] Step B: Measure the pH calibration value PHΔa of the sample solution and set it as y. Use the TDS probe 6 and the TDS value preliminary calibration unit 9 to preliminarily calibrate the sample solution's TDS preliminary value TDSΔa. Since the solution is acidic or alkaline, its conductivity increases. Therefore, the measured TDS preliminary value TDSΔa> the TDS revised value TDSΔb. Assume that the TDS preliminary value TDSΔa of the tested water generated by the TDS probe 6 and the TDS value preliminary calibration unit 9 is equal to f. That is, when the pH calibration value PHΔa of the sample solution is equal to y, the K value is equal to f-500.

[0086] By combining the operating theories of steps A and B, adjusting the variables of the experimental operation, that is, selecting soluble solids of different types and proportions to make the pH value of the sample solution different, a data relationship table corresponding to the pH calibration value PH△a and K value can be obtained.

[0087] The following is part of the experimental data obtained by the inventor under standard experimental conditions:

[0088] 1. For the corresponding relationship between TDS initial value, TDS revised value and pH value, please refer to the attached figure in the manual. Figure 7 :

[0089] 2. For the corresponding relationship between pH value and K value, please refer to the attached figure in the manual. Figure 8 :

[0090] 3. Data relationship table corresponding to pH value and K value:

[0091]

[0092] The data in the above chart is only a part of the experimental data. By adjusting the variables of the experimental operation, a complete data relationship table of pH calibration value PH△a and K value corresponding to each other can be obtained.

[0093] In the above-mentioned TDS value correction system, the temperature calibration value of the tested water is generated by the temperature calibration unit 7, the initial TDS value of the tested water is generated by the TDS value preliminary calibration unit 9, and the TDS correction value is generated by the TDS value correction calibration unit 10. All of them are analyzed and processed by the data processing module 11 and then fed back to the display unit of the water quality test pen for display, so that the water quality test pen can display the temperature value, TDS value and pH value of the water.

[0094] The working principle of the TDS value correction system of the water quality detection pen has been shown above. The specific implementation plan for the preliminary calibration of the TDS value through the temperature calibration unit 7 and the TDS value preliminary calibration unit 9 can be implemented with reference to the existing technology, such as the invention patent CN103675022B. The specific implementation plan for calibrating the pH value by the pH value calibration unit 8 can also be implemented according to the existing technology, and reference can be made to the encyclopedia entries: "PH electrode" and "PH test pen".

[0095] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional water quality detection pen, comprising a pen body (1), a detection component and a TDS value correction system of the water quality detection pen, characterized in that: The detection end of the pen body (1) is provided with an integrally formed end protective shell (2), and a partition (3) is fixedly provided on the inner wall of the middle portion of the end protective shell (2), so that two detection cavities are formed between the inner cavity of the end protective shell (2) and the detection end of the pen body (1) through the partition (3); The detection assembly comprises a pH electrode (4), a temperature sensor (5) and a TDS probe (6) fixedly mounted on the detection end of the pen body (1); the glass membrane bulb of the pH electrode (4) and the TDS probe (6) are respectively located in two detection cavities; the TDS probe (6) comprises an insulating block (61) and a conductive column 1 (62) and a conductive column 2 (63) fixedly embedded in the insulating block (61); the conductive column 1 (62) and the conductive column 2 (63) are both fixedly connected to a conductive block (64) on opposite sides; the outer surfaces of the conductive column 1 (62), the conductive column 2 (63) and the conductive block (64) are all coated with an insulating coating (65); the insulating coating (65) is removed from the opposite sides of the two conductive blocks (64) by a grinding process to form a smooth conductive surface (66); The TDS value correction system comprises a temperature calibration unit (7), a pH value calibration unit (8), a TDS value preliminary calibration unit (9), a TDS value correction calibration unit (10), a data processing module (11), and a correction method of the TDS value correction system, wherein the correction method is as follows: Ⅰ. Generate a temperature calibration value of the water being tested through a temperature sensor (5) and a temperature calibration unit (7); II. Generate a TDS sampling value of the water being tested through the TDS probe (6) and the TDS value preliminary calibration unit (9), perform temperature compensation according to the temperature calibration value, and then generate a preliminary TDS value of the water being tested, which is marked as TDS△a; III. Generate a pH sampling value of the water being tested through the pH calibration unit (8) and the pH electrode (4), and perform temperature compensation according to the temperature calibration value to generate a pH calibration value of the water being tested, which is marked as pH△a; IV. The TDS value correction calibration unit (10) is used to convert the pH calibration value pH△a generated by the pH value calibration unit (8) and the TDS initial value TDS△a generated by the TDS value preliminary calibration unit (9) to obtain the TDS revised value of the tested water, which is marked as TDS△b. The specific conversion relationship is as follows: When the pH calibration value pH△a=7, Then the TDS revised value TDS△b=TDS initial value TDS△a; When the pH calibration value pH△a<7 or the pH calibration value pH△a>7, That is, when the pH calibration value pH△a is a variable, TDS revised value TDS△b=TDS initial value TDS△a-K; Among them, K is the variable coefficient of the influence of the pH calibration value pH△a on the TDS initial value TDS△a, that is, the gain value caused by the influence of the pH value of the tested water on the TDS initial value TDS△a. When the pH calibration value pH△a changes, the K value will also change. The pH calibration value pH△a is obtained using the pH value calibration unit (8). The variable coefficient K is obtained through experimental data, and a data relationship table corresponding to the pH calibration value pH△a as a variable and the K value is prepared. Finally, the TDS value correction calibration unit (10) is used to generate the TDS revised value TDS△b according to the data relationship table and the above conversion relationship.

2. The multifunctional water quality testing pen according to claim 1, characterized in that: In the TDS value correction system, a temperature calibration value of the water to be tested is generated by a temperature calibration unit (7), a preliminary TDS value of the water to be tested is generated by a TDS value preliminary calibration unit (9), and a revised TDS value is generated by a TDS value correction calibration unit (10). All of these are analyzed and processed by a data processing module (11) and then fed back to the display unit of the water quality test pen for display.

3. The multifunctional water quality testing pen according to claim 1, characterized in that: Two first immersion grooves (21) are provided on the upper surface of the end protective shell (2), and the two first immersion grooves (21) are respectively located at the tops of the two detection cavities; two second immersion grooves (22) are provided on the bottom surface of the end protective shell (2), and the two second immersion grooves (22) are respectively located at the bottoms of the two detection cavities; and immersion holes (23) are provided on the left side and the right side of the end protective shell (2).

4. The multifunctional water quality testing pen according to claim 1, characterized in that: The relative cross-sectional areas of the two conductive blocks (64) are the same, and the areas of the conductive surfaces (66) after deep grinding and shallow grinding of the relative sides of the two conductive blocks (64) are equal.

5. The multifunctional water quality testing pen according to claim 1, characterized in that: The material of the insulating coating (65) is preferably epoxy resin or polyamide-imide, and the conductive surface (66) is formed into a gold-plated surface through gold plating.

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