A method to improve the detection accuracy of low-precision residual chlorine sensors

Abstract

This invention discloses a method for improving the detection accuracy of low-precision residual chlorine sensors, comprising: 1. setting up a high-precision residual chlorine sensor and each low-precision residual chlorine sensor in a test water tank; 2. quantitatively injecting tap water containing residual chlorine concentration into the test water tank and recording the detected residual chlorine concentration value; 3. calculating the correlation coefficient between the high-precision residual chlorine sensor and each low-precision residual chlorine sensor at a first water level; 4. adding sodium hypochlorite disinfectant to the test water tank multiple times and calculating the correlation coefficient at different residual chlorine concentrations; 5. calculating the average correlation coefficient at the first water level; 6. emptying the test water tank and repeating steps 2-5 to obtain the average correlation coefficient at different water levels; 7. plotting a precision table of water level-average correlation coefficient, and improving the detection accuracy of each low-precision residual chlorine sensor based on the precision table. This method improves the detection accuracy of low-precision residual chlorine sensors by correcting the correlation coefficient, thereby reducing costs.

Description

Technical Field

[0001] This invention relates to the field of secondary water supply detection technology, and in particular to a method for improving the detection accuracy of low-precision residual chlorine sensors. Background Technology

[0002] Currently, the vast majority of urban drinking water (commonly known as tap water) in my country is disinfected using chlorine-based disinfectants. Adding chlorine-based disinfectants to tap water maintains a sufficient residual chlorine concentration in the tap water network for an extended period, ensuring that microorganisms in the tap water are controlled within acceptable limits. Residual chlorine refers to the amount of available chlorine remaining in the water after the chlorine-based disinfectant has been in contact with the water for a certain period of time.

[0003] With the increasing number of secondary water supply pump stations in urban high-rise residential buildings, the safety of water quality in these secondary water supply tanks has become a major concern. To effectively protect the water quality for urban secondary water supply users, based on health department regulations and actual secondary water supply conditions, secondary water supply pump stations need to be equipped with online water quality monitoring and automatic disinfection systems for water tanks. This allows for the automatic replenishment of disinfectant when the residual chlorine concentration in the tap water falls below a set value.

[0004] To address this, patent document CN113233557A discloses a precise control system for intelligent chlorination and disinfection in secondary water supply systems. This system utilizes a distributed circulating dosing system to evenly distribute disinfectant throughout the water tank, ensuring rapid and uniform mixing and guaranteeing accurate and reliable data from the real-time residual chlorine sampling and detection system. Simultaneously, a high-precision residual chlorine sensor accurately detects the residual chlorine level in the tank, making the dosing dosage of the chlorination system safer and more accurate, improving the control precision of residual chlorine in the secondary water supply tank, and effectively ensuring the safety of the secondary water supply quality. However, in practical applications, this system requires a high-precision residual chlorine sensor to detect the residual chlorine concentration. These sensors cost approximately 20,000 RMB per set, which is expensive and contributes to the high overall cost, hindering widespread adoption. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned problems existing in the prior art and to provide a method for improving the detection accuracy of a low-precision residual chlorine sensor. This method improves the detection accuracy of the low-precision residual chlorine sensor by finding the correlation coefficient between the high-precision and low-precision residual chlorine sensors and correcting the correlation coefficient, thereby achieving the goal of replacing the high-precision residual chlorine concentration sensor with a low-precision residual chlorine sensor and reducing costs.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A method for improving the detection accuracy of a low-precision residual chlorine sensor, characterized by comprising the following steps:

[0008] Step 1: Prepare one high-precision residual chlorine sensor and multiple low-precision residual chlorine sensors, and set the high-precision residual chlorine sensor and the low-precision residual chlorine sensor in the test water tank respectively;

[0009] Step 2: Quantitatively inject tap water containing residual chlorine into the test water tank. After the residual chlorine concentration in the tap water stabilizes, record the residual chlorine concentration values ​​detected by the high-precision residual chlorine sensor and each low-precision residual chlorine sensor at the first water level.

[0010] Step 3: Calculate the correlation coefficient between the high-precision residual chlorine sensor and each low-precision residual chlorine sensor at the first water level based on the residual chlorine concentration values ​​of the high-precision residual chlorine sensor and the low-precision residual chlorine sensor respectively.

[0011] Step 4: Add sodium hypochlorite disinfectant to the test water tank multiple times to increase the residual chlorine concentration of the tap water. After each addition of sodium hypochlorite disinfectant, record the residual chlorine concentration values ​​corresponding to the high-precision residual chlorine sensor and the low-precision residual chlorine sensor, and calculate the correlation coefficient between the high-precision residual chlorine sensor and each low-precision residual chlorine sensor under different residual chlorine concentrations.

[0012] Step 5: Calculate the average correlation coefficient between the high-precision residual chlorine sensor and each low-precision residual chlorine sensor at the first water level based on the results of Step 3 and Step 4.

[0013] Step 6: Empty the test water tank, then inject different amounts of tap water into the test water tank multiple times, and then repeat steps 2-5 to obtain the average correlation coefficient between the high-precision residual chlorine sensor and each low-precision residual chlorine sensor at different water levels.

[0014] Step 7: Based on the results of Step 5 and Step 6, plot the accuracy table of each low-precision residual chlorine sensor with respect to the water level-average correlation coefficient, thereby improving the detection accuracy of each low-precision residual chlorine sensor according to the accuracy table.

[0015] In step 3, the correlation coefficient is calculated as follows:

[0016] x=A / B

[0017] Where x is the correlation coefficient, A is the residual chlorine concentration value detected by the high-precision residual chlorine sensor, and B is the residual chlorine concentration value detected by the low-precision residual chlorine sensor.

[0018] In step 1, the volume of the test tank is 5-50 tons.

[0019] In step 1, the number of low-precision residual chlorine sensors is 5-30. Each low-precision residual chlorine sensor is arranged in a ring, line or array in the test water tank, and the high-precision residual chlorine sensor is set at the center of each low-precision residual chlorine sensor.

[0020] In step 4, each time sodium hypochlorite disinfectant is added, the residual chlorine concentration in the tap water is increased by 5%-10%.

[0021] In step 4, sodium hypochlorite disinfectant is added 3-6 times.

[0022] In step 6, the amount of tap water injected into the test tank each time is 5-10 tons.

[0023] The advantages of using this invention are:

[0024] 1. The method for improving the detection accuracy of low-precision residual chlorine sensors described in this invention mainly uses a high-precision residual chlorine sensor as a benchmark. Under the same conditions, the correlation coefficient between other low-precision residual chlorine sensors and the high-precision sensor is found to correct and improve the detection accuracy of the low-precision residual chlorine sensors. Using this method, in practical applications, only one high-precision residual chlorine sensor needs to be purchased to effectively utilize the low-precision residual chlorine sensor. This not only achieves the goal of replacing high-precision residual chlorine concentration sensors with low-precision sensors and effectively reducing costs, but also facilitates the promotion of the technology.

[0025] 2. By preparing multiple low-precision residual chlorine sensors simultaneously, this invention facilitates the determination of the correlation coefficients of multiple low-precision sensors in one go.

[0026] 3. This invention, by injecting different amounts of tap water into the test tank multiple times and replenishing the test tank with sodium hypochlorite disinfectant multiple times, can not only obtain the average correlation coefficient between the high-precision residual chlorine sensor and each low-precision residual chlorine sensor at different water levels, but also help to further improve the accuracy of the correlation coefficient, thereby facilitating more accurate detection results in practical applications.

[0027] 4. In this invention, each low-precision residual chlorine sensor is set in a ring, line, or array shape in the test water tank, and a high-precision residual chlorine sensor is set at the center of each low-precision residual chlorine sensor. Its advantage is that a more accurate residual chlorine concentration value can be obtained in each test, which is conducive to improving the accuracy of the correlation coefficient. Attached Figure Description

[0028] Figure 1 This is a flowchart of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the present invention (I);

[0030] Figure 3 This is a schematic diagram (II) of the structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the present invention (III).

[0032] The following are labeled in the diagram: 1. Test water tank, 2. High-precision residual chlorine sensor, 3. Low-precision residual chlorine sensor. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of this application.

[0034] Example 1

[0035] like Figure 1 As shown, a method for improving the detection accuracy of a low-precision residual chlorine sensor includes the following steps:

[0036] Step 1: Prepare a test water tank 1, a high-precision residual chlorine sensor 2, and multiple low-precision residual chlorine sensors 3. The volume of test water tank 1 should be 5-50 tons, specifically 10 tons; the number of low-precision residual chlorine sensors 3 should be 5-30, specifically 12 sensors. Then, install the high-precision residual chlorine sensor 2 and the low-precision residual chlorine sensors 3 in test water tank 1 respectively.

[0037] Step 2: Quantitatively inject tap water containing residual chlorine into test water tank 1. The amount of tap water injected can be the lowest water level in test water tank 1. After the residual chlorine concentration in the tap water stabilizes, record the residual chlorine concentration value detected by the high-precision residual chlorine sensor 2 and the residual chlorine concentration values ​​detected by each low-precision residual chlorine sensor 3 at the first water level.

[0038] Step 3: Calculate the correlation coefficients between the high-precision residual chlorine sensor 2 and each low-precision residual chlorine sensor 3 at the first water level based on the residual chlorine concentration values ​​of the high-precision residual chlorine sensor 2 and the low-precision residual chlorine sensor 3.

[0039] In this step, the correlation coefficient is calculated as follows:

[0040] x=A / B

[0041] Where x is the correlation coefficient, A is the residual chlorine concentration value detected by the high-precision residual chlorine sensor, and B is the residual chlorine concentration value detected by the low-precision residual chlorine sensor.

[0042] Specifically, if each low-precision residual chlorine sensor 3 is designated as sensor 1, sensor 2, sensor 3... sensor 12, then this step will yield 12 correlation coefficients after calculation.

[0043] Step 4: Add sodium hypochlorite disinfectant to test water tank 1 multiple times to increase the residual chlorine concentration of tap water. After each addition of sodium hypochlorite disinfectant, record the corresponding residual chlorine concentration value detected by high-precision residual chlorine sensor 2 and the corresponding residual chlorine concentration value detected by low-precision residual chlorine sensor 3. Then, calculate the correlation coefficient between high-precision residual chlorine sensor 2 and each low-precision residual chlorine sensor 3 under different residual chlorine concentrations.

[0044] It should be noted that, based on actual needs and the requirement to improve the accuracy of the correlation coefficients, this step preferably involves adding sodium hypochlorite disinfectant 3-6 times, for example, 4 times. Each addition of sodium hypochlorite disinfectant increases the residual chlorine concentration in the tap water by 5%-10%. Furthermore, after each addition of sodium hypochlorite disinfectant, this step will ultimately yield 12 correlation coefficients; if 4 additions are made, this step will ultimately yield 48 correlation coefficients.

[0045] Step 5: Calculate the average correlation coefficient between the high-precision residual chlorine sensor 2 and each low-precision residual chlorine sensor 3 at the first water level based on the results of Steps 3 and 4. Since this average correlation coefficient is calculated by combining the 12 correlation coefficients in Step 3 and the 48 correlation coefficients in Step 4, its accuracy is further improved.

[0046] Step 6: Empty test water tank 1, then inject different amounts of tap water into test water tank 1 in multiple batches, each time injecting 5-10 tons of tap water, until the maximum water level of test water tank 1 is reached. Then repeat steps 2-5 to obtain the average correlation coefficient between the high-precision residual chlorine sensor 2 and each low-precision residual chlorine sensor 3 at different water levels.

[0047] Step 7: Based on the results of Step 5 and Step 6, draw the accuracy table of each low-precision residual chlorine sensor 3 with respect to the water level-average correlation coefficient. Then, correct the detection accuracy of each low-precision residual chlorine sensor according to the average correlation coefficient in the accuracy table. This will enable the low-precision residual chlorine sensor 3 to obtain more accurate detection results, thereby improving the detection accuracy of each low-precision residual chlorine sensor.

[0048] In practical use, this invention first calculates the average correlation coefficient of each low-precision residual chlorine sensor 3 at different water levels. Then, based on the average correlation coefficient, it corrects the residual chlorine concentration values ​​detected by the low-precision residual chlorine sensor 3 at different water levels, thus obtaining a result with similar detection accuracy to the high-precision residual chlorine sensor 2. In summary, in practical applications, this invention only requires the purchase of one high-precision residual chlorine sensor 2 to effectively utilize the low-precision residual chlorine sensor 3. This not only achieves the goal of replacing the high-precision residual chlorine concentration sensor with the low-precision residual chlorine sensor 3 and effectively reducing costs, but also facilitates the promotion of the technology.

[0049] Example 2

[0050] To improve the accuracy of the correlation coefficient, this embodiment further specifies the arrangement of the residual chlorine sensor in the test water tank 1 based on Embodiment 1. For example... Figure 2-4 As shown, taking 12 low-precision residual chlorine sensors 3 as an example, in this embodiment, each low-precision residual chlorine sensor 3 can be arranged in a ring, a line or an array in the test water tank 1, while the high-precision residual chlorine sensor 2 is set at the center of each low-precision residual chlorine sensor 3, so as to further improve the accuracy of the correlation coefficient calculation.

[0051] The above description is merely a specific embodiment of the present invention. Any feature disclosed in this specification may be replaced by other equivalent or similar features unless otherwise specified. All features or steps in the disclosed methods or processes may be combined in any way, except for mutually exclusive features and / or steps.

Claims

1. A method for improving the detection accuracy of a low-precision residual chlorine sensor, characterized in that, Includes the following steps: Step 1: Prepare a high-precision residual chlorine sensor (2) and multiple low-precision residual chlorine sensors (3), and set the high-precision residual chlorine sensor (2) and the low-precision residual chlorine sensor (3) in the test water tank (1) respectively; Step 2: Quantitatively inject tap water with residual chlorine concentration into the test water tank (1). After the residual chlorine concentration in the tap water stabilizes, record the residual chlorine concentration values ​​detected by the high-precision residual chlorine sensor (2) and each low-precision residual chlorine sensor (3) at the first water level. Step 3: Calculate the correlation coefficients between the high-precision residual chlorine sensor (2) and each low-precision residual chlorine sensor (3) at the first water level based on the residual chlorine concentration values ​​of the high-precision residual chlorine sensor (2) and the low-precision residual chlorine sensor (3); Step 4: Add sodium hypochlorite disinfectant to the test water tank (1) multiple times to increase the residual chlorine concentration of the tap water. After each addition of sodium hypochlorite disinfectant, record the residual chlorine concentration values ​​corresponding to the high-precision residual chlorine sensor (2) and the low-precision residual chlorine sensor (3), and calculate the correlation coefficient between the high-precision residual chlorine sensor (2) and each low-precision residual chlorine sensor (3) under different residual chlorine concentrations. Step 5: Calculate the average correlation coefficient between the high-precision residual chlorine sensor (2) and each low-precision residual chlorine sensor (3) at the first water level based on the results of Step 3 and Step 4; Step 6: Empty the test water tank (1), then inject different amounts of tap water into the test water tank (1) multiple times, and then repeat steps 2-5 to obtain the average correlation coefficient between the high-precision residual chlorine sensor (2) and each low-precision residual chlorine sensor (3) at different water levels. Step 7: Based on the results of Step 5 and Step 6, draw the accuracy table of each low-precision residual chlorine sensor (3) with respect to the water level-average correlation coefficient, thereby improving the detection accuracy of each low-precision residual chlorine sensor according to the accuracy table.

2. The method for improving the detection accuracy of a low-precision residual chlorine sensor according to claim 1, characterized in that: In step 3, the correlation coefficient is calculated as follows: x=A / B Where x is the correlation coefficient, A is the residual chlorine concentration value detected by the high-precision residual chlorine sensor, and B is the residual chlorine concentration value detected by the low-precision residual chlorine sensor.

3. The method for improving the detection accuracy of a low-precision residual chlorine sensor according to claim 1, characterized in that: In step 1, the volume of the test water tank (1) is 5-50 tons.

4. The method for improving the detection accuracy of a low-precision residual chlorine sensor according to claim 1, characterized in that: In step 1, the number of low-precision residual chlorine sensors (3) is 5-30. Each low-precision residual chlorine sensor (3) is arranged in a ring, line or array in the test water tank (1). The high-precision residual chlorine sensor (2) is set at the center of each low-precision residual chlorine sensor (3).

5. The method for improving the detection accuracy of a low-precision residual chlorine sensor according to claim 1, characterized in that: In step 4, each time sodium hypochlorite disinfectant is added, the residual chlorine concentration in the tap water is increased by 5%-10%.

6. The method for improving the detection accuracy of a low-precision residual chlorine sensor according to claim 1, characterized in that: In step 4, sodium hypochlorite disinfectant is added 3-6 times.

7. The method for improving the detection accuracy of a low-precision residual chlorine sensor according to claim 1, characterized in that: In step 6, the amount of tap water injected into the test water tank (1) each time is 5-10 tons.

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