Membrane conductivity method organic carbon analyzer measurement compensation method

Abstract

The invention provides a measurement compensation method for a membrane conductivity method organic carbon analyzer, which comprises the following steps of: measuring the temperature of a measuring electrode and a gas-liquid separator in real time, and establishing a mathematical model by combining the temperature measurement signals of the two parts according to different materials and response characteristics of the two parts in a system to form a compensation algorithm; the compensation algorithm is corrected through actual data measurement, then the algorithm is verified and corrected through testing, and finally the method is applied to a measurement system, so that a more accurate and stable testing result is obtained, a correction result is obtained by correcting a deviation testing result of the influence of the temperature on the electrode, and the measurement accuracy is improved. According to the method, the gas-liquid separator is corrected, the deviation of the gas-liquid separator influenced by the temperature is calculated according to the correction result, the corrected result is obtained, the final measurement value is obtained, the corrected measurement value is more accurate and stable, the influence of the temperature is small, and the measurement accuracy and stability of test system equipment or devices at different environment temperatures are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of machine detection and machine measurement, in particular to a measurement compensation method for a membrane conductivity method organic carbon analyzer. Background Art

[0002] In existing detection and measurement machines, the temperature of a certain component often causes deviations in the measured data. Taking the membrane conductivity organic carbon analyzer as an example, the gas-liquid separator and conductivity measurement cell in its test circuit will be affected by the ambient temperature during operation and produce different working characteristics, which directly affects the conductivity measurement results, resulting in large measurement errors and seriously affecting the normal use of the machine.

[0003] In order to solve this problem, existing products often measure the temperature in the conductivity measuring cell and make a temperature compensation for the measured value, which compensates for the influence of ambient temperature to a certain extent and improves the use characteristics of the machine. However, in actual work, it is also found that the working characteristics of other components are affected by ambient temperature. For example, the material of the gas-liquid separator in this case will also be affected by temperature and produce measurement errors. Therefore, these changes must also be corrected or compensated by the algorithm. Summary of the invention

[0004] In order to solve the problems existing in the prior art during use, the present invention provides a measurement compensation method for a membrane conductivity organic carbon analyzer which can relatively accurately improve the test results.

[0005] A membrane conductivity organic carbon analyzer measurement compensation method is provided, which measures the temperature of the measuring electrode and the gas-liquid separator in real time, and combines the temperature measurement signals of the two components to establish a mathematical model based on their different materials and the response characteristics of the system to form a compensation algorithm, which is corrected by actual data measurement, and then verified and corrected by testing, and finally applied in the measurement system; the specific steps are as follows: step 1, correcting the deviation of the electrode affected by temperature according to formula 1 to obtain the corrected result ; Formula 1, In the formula, x1 is the first compensation value, b is the conductivity measurement result of the conductivity test cell, k is the compensation coefficient of the conductivity test cell, T1 is the temperature measured on the conductivity test cell, is the first calibration temperature reference point; Step 2, substitute the x1 value obtained in Step 1 into Formula 2, calculate and correct the deviation of the gas-liquid separator affected by temperature, and obtain the corrected result , Output as test result; Formula 2, Wherein, x2 is the second compensation value, q is the compensation coefficient of the gas-liquid separator, is the temperature measured on the gas-liquid separator, is the second calibration temperature reference point.

[0006] As a further improvement, the conductivity test cell is provided with a first temperature sensor for detecting temperature; and the gas-liquid separator is provided with a second temperature sensor for detecting temperature.

[0007] As a further improvement, the value of k is 0.010 to 0.45; It can be 25℃.

[0008] As a further improvement, the value of q is -0.20 to +0.20; It can be 25℃.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a membrane conductivity organic carbon analyzer measurement compensation method, which measures the temperature of the measuring electrode and the gas-liquid separator in real time, and combines the temperature measurement signals of the two components to establish a mathematical model based on the different materials and the response characteristics of the system to form a compensation algorithm, which is corrected by actual data measurement, and then verified and corrected by testing, and finally applied in the measurement system, thereby obtaining a relatively accurate and stable test result. The correction result is obtained by correcting the deviation test result of the electrode affected by temperature, and the correction result is used to calculate the deviation of the gas-liquid separator affected by temperature to obtain the corrected result and the final measurement value. The corrected measurement value is more accurate and stable, less affected by temperature, and greatly improves the measurement accuracy and stability of the test system equipment or device under different ambient temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a comparison curve diagram of the b value changes before and after correction in machine 1; Figure 2 is the ambient temperature of machine 1 when measuring; Figure 3 is a comparison curve diagram of the b value changes before and after correction in machine 2; Figure 4 The ambient temperature when measuring machine 2; Figure 5 is a comparison curve diagram of the b value changes before and after correction in machine 3; Figure 6 The ambient temperature when measuring machine 3; Figure 7 It is a simplified schematic diagram of a membrane conductivity organic carbon analyzer; Among them, conductivity test cell 1, first temperature sensor 2, gas-liquid separator 3, second temperature sensor 4; Figure 1 , 3 ,5, the X-axis represents the test order, and the Y-axis represents the two test data before and after the correction corresponding to the test order; Figure 2 , 4 In 6, the x-axis represents the test order and the y-axis represents the temperature. DETAILED DESCRIPTION

[0011] The present invention is further described below in conjunction with specific embodiments.

[0012] refer to Figure 1-7 A membrane conductivity organic carbon analyzer measurement compensation method, real-time temperature measurement of the measuring electrode and the gas-liquid separator 3, and the temperature measurement signals of the two components are combined to establish a mathematical model based on their different materials and the response characteristics of the system to form a compensation algorithm, which is corrected by actual data measurement, and then verified and corrected by testing, and finally applied in the measurement system; The specific steps are as follows: Step 1, correct the deviation of the electrode affected by temperature according to formula 1 to obtain the corrected result ; Formula 1, In the formula, x1 is the first compensation value, b is the conductivity measurement result of conductivity test cell 1, k is the compensation coefficient of conductivity test cell 1, T1 is the temperature measured on the conductivity test cell, is the first calibration temperature reference point; Step 2, substitute the x1 value obtained in Step 1 into Formula 2, calculate and correct the deviation of the gas-liquid separator affected by temperature, and obtain the corrected result , Output as test result; Formula 2, Wherein, x2 is the second compensation value, q is the compensation coefficient of the gas-liquid separator, is the temperature measured on the gas-liquid separator, is the second calibration temperature reference point.

[0013] In the test loop of the analyzer, the conductivity test cell 1 and the gas-liquid separator 3 are both affected by temperature and will produce measurement errors, such as Figure 7 , is a schematic diagram of a test circuit, which includes a conductivity test cell 1 and a corresponding first temperature sensor 2, the first temperature sensor 2 is used to measure the temperature in the conductivity test cell 1, and also includes a gas-liquid separator 3 and a corresponding second temperature sensor 4, the second temperature sensor 4 is used to measure the temperature of the gas-liquid separator 3. The conductivity test cell 1 is provided with a first temperature sensor 2 for detecting temperature, which can be used to test T1; the gas-liquid separator 3 is provided with a second temperature sensor 4 for detecting temperature, which can be used to test T2.

[0014] The k value is generally in the range of 0.010 to 0.45. Due to the different materials and structural structures of the conductivity test cell, the k value is generally in the range of 0.010 to 0.45. It is generally 25°C, and other temperature reference points can also be selected based on the actual temperature response characteristics of the conductivity test cell.

[0015] The value of q is generally in the range of -0.20 to +0.20. Due to the different materials used and structural composition in the gas-liquid separator, the Generally it is 25°C, but other temperature reference points may be selected according to the actual temperature response characteristics of the gas-liquid separator.

[0016] refer to Figure 1-6 The present invention verifies the correction effect of the correction method in three machines and compares the ambient temperature at that time. Figure 1 , 3 , 5 are the comparison curves of the b value changes before and after correction measured by machine 1, machine 2, and machine 3 respectively.

[0017] Among them, Figure 1, the test data is as follows: Among them, the test data of machine 2 is as follows: Among them, Figure 3, the test data is as follows: Among them, TC: total carbon, IC: inorganic carbon, TOC: total organic carbon; the relationship between the three variables is: TOC=TC-IC.

[0018] Figure 2 , 4 , 6 are the curves of the change of ambient temperature of machine 1, machine 2 and machine 3 during the test respectively. According to the b-value curves of the three machines, it can be seen that: with the change of ambient temperature, the change of b-value before correction is larger than that of b-value after correction, especially when the ambient temperature changes greatly, the change of b-value before correction is also relatively larger, indicating that b-value before correction is affected by temperature, and the change of ambient temperature will affect the accuracy of the measured data value, making the measurement effect of b-value poor and the stability poor; while the change of the curve after correction is less affected by temperature, or almost not affected by temperature, and the test is more stable and accurate.

[0019] It can be concluded that in practical applications, the temperature compensation method of the present invention can reduce the influence of temperature on the test results. In this case, x2 is output as the test result. This value has overcome the working performance deviation of the conductivity test cell and the gas-liquid separator in the test system equipment or device caused by changes in ambient temperature, making each measurement more accurate and stable, and the test results are close to and approximately equal to the true value, thereby improving the accuracy of the instrument test data.

[0020] Taking this as an example, if there are other factors (components) affected by temperature in the test system equipment or device, additional calculation steps and parameter adjustments can be performed according to their response characteristics to the ambient temperature to achieve a satisfactory compensation effect. It should be noted that the basic technologies required but not mentioned in the present invention can adopt existing technical solutions.

[0021] Therefore, similar system equipment or devices in this professional and industrial field can also be applied and learned from this method. They are not listed one by one here. They should all be regarded as within the spirit and principles of the present invention. Any modifications, equivalent substitutions, improvements, etc. made should be included in the scope of protection of the present invention.

Claims

1. A membrane conductivity organic carbon analyzer measurement compensation method, characterized in that: The temperature of the measuring electrode and the gas-liquid separator is measured in real time, and the temperature measurement signals of the two components are combined to establish a mathematical model based on their different materials and the response characteristics of the system to form a compensation algorithm. The compensation algorithm is corrected through actual data measurement, and then the algorithm is verified and corrected through testing, and finally applied in the measurement system; The specific steps are as follows: Step 1, correct the deviation of the electrode affected by temperature according to formula 1 to obtain the corrected result ; Formula 1, In the formula, x1 is the first compensation value, b is the conductivity measurement result of the conductivity test cell, k is the compensation coefficient of the conductivity test cell, T1 is the temperature measured on the conductivity test cell, is the first calibration temperature reference point; Step 2, substitute the x1 value obtained in Step 1 into Formula 2, calculate and correct the deviation of the gas-liquid separator affected by temperature, and obtain the corrected result , Output as test result; Formula 2, Wherein, x2 is the second compensation value, q is the compensation coefficient of the gas-liquid separator, is the temperature measured on the gas-liquid separator, is the second calibration temperature reference point.

2. The membrane conductivity organic carbon analyzer measurement compensation method according to claim 1, characterized in that: The conductivity test cell is provided with a first temperature sensor for detecting temperature; the gas-liquid separator is provided with a second temperature sensor for detecting temperature.

3. The membrane conductivity organic carbon analyzer measurement compensation method according to claim 1, characterized in that: The value of k is 0.010 to 0.45; It can be 25℃.

4. The membrane conductivity organic carbon analyzer measurement compensation method according to claim 1, characterized in that: The q value is -0.20 to +0.20; It can be 25℃.

Images