Method and system for calibrating secondary instrument of micro-dissolved oxygen meter and storage medium

Abstract

The application relates to a micro-dissolved oxygen meter secondary instrument calibration method, system and storage medium, and relates to the technical field of secondary instrument calibration. The calibration process of the micro-dissolved oxygen meter is imperfect, and the calibration of the secondary instrument of the micro-dissolved oxygen meter is insufficient, so that the calibration accuracy and reliability of the micro-dissolved oxygen meter are low. The method comprises the following steps: determining the target priority of a plurality of preset secondary instrument calibration modes according to the measurement indexes of the secondary instrument to be measured; the target priority represents the initial order of calling each preset secondary instrument calibration mode for calibration; according to the target priority, each preset secondary instrument calibration mode is called to calibrate each measurement index of the secondary instrument to be measured, and a calibration report is obtained; the plurality of measurement indexes include one or more of the following: a dissolved oxygen concentration measurement value, a temperature measurement value or a temperature-compensated dissolved oxygen concentration measurement value; one preset secondary instrument calibration mode corresponds to one measurement index.

Description

Technical Field

[0001] This application relates to the field of secondary instrument calibration technology, and in particular to calibration methods, systems and storage media for secondary instruments of trace dissolved oxygen meters. Background Technology

[0002] Large-capacity generator sets have extremely high requirements for water and steam quality. Accurate monitoring of water and steam quality is a necessary measure to ensure the safe and economical operation of thermal power generator sets. Given that most online chemical instruments have measurement errors, regular calibration is required. However, currently, the calibration method for trace dissolved oxygen meters to check water and steam quality only calibrates the primary and secondary instruments of the trace dissolved oxygen meter as a whole unit, lacking calibration of the secondary instrument of the trace dissolved oxygen meter. This makes it difficult to detect the measurement deviation of the trace dissolved oxygen meter, resulting in inaccurate measurement results, low measurement accuracy and poor reliability. Consequently, the problem of water and steam quality deterioration cannot be detected in time, causing corrosion, scaling and salt accumulation in the generator set's water and steam system. Summary of the Invention

[0003] This invention provides a calibration method, system, and storage medium for the secondary instrument of a trace dissolved oxygen meter, addressing the problem that incomplete calibration procedures for trace dissolved oxygen meters, particularly the lack of calibration of the secondary instrument, lead to low accuracy and poor reliability in the calibration of these meters. The technical solution of this invention is as follows:

[0004] According to a first aspect of the present invention, a calibration method for a secondary instrument of a trace dissolved oxygen meter is provided. The method includes: determining a target priority of multiple preset secondary instrument calibration methods based on the measurement indicators of the secondary instrument to be tested; the target priority represents the order in which the various preset secondary instrument calibration methods are invoked for calibration; the multiple preset secondary instrument calibration methods include: a first whole-machine calibration method, a second current-to-dissolved oxygen relationship calibration method, a third temperature signal calibration method, and a fourth temperature-compensated signal calibration method; according to the target priority, invoking each preset secondary instrument calibration method to calibrate each measurement indicator of the secondary instrument to be tested, and obtaining a calibration report; the multiple measurement indicators include one or more of the following: dissolved oxygen concentration measurement value, temperature measurement value, or temperature-compensated dissolved oxygen concentration measurement value; one preset secondary instrument calibration method corresponds to one measurement indicator.

[0005] As one implementation method, according to the target priority, each preset secondary instrument verification method is called to verify each measurement index of the secondary instrument under test, and a verification report is obtained. This report includes: according to the target priority call sequence, the preset secondary instrument verification method corresponding to the target call sequence is called to verify the target measurement index of the secondary instrument under test, and the measurement accuracy result is obtained. The measurement accuracy result represents the measurement error value of the secondary instrument under test for the target measurement index. The measurement accuracy result includes the first measurement accuracy result corresponding to the first whole machine verification method, the second measurement accuracy result corresponding to the second current-to-dissolved oxygen relationship verification method, the third measurement accuracy result corresponding to the third temperature signal verification method, and the fourth measurement accuracy result corresponding to the fourth temperature compensation signal verification method. If the target measurement error value of the target measurement accuracy result exceeds the preset error range, the verification report is determined to indicate that the secondary instrument under test has a fault, and the verification ends. Otherwise, the preset secondary instrument verification method corresponding to the next level call sequence is called to verify the measurement index corresponding to the secondary instrument under test, until all preset secondary instrument verification methods are traversed, and the measurement accuracy results corresponding to multiple measurement indexes are obtained. The verification report of the secondary instrument under test is then determined to be the measurement accuracy result corresponding to all measurement indexes.

[0006] As one implementation method, based on the feedback signal of the secondary instrument under test, the target priority of multiple preset secondary instrument calibration methods is determined, including: determining the first whole-machine calibration method as the highest priority; the fourth temperature compensation signal calibration method as the lowest priority; and determining the priority level of the second current-to-dissolved oxygen relationship calibration method and the third temperature signal calibration method based on the measurement indicators of the secondary instrument under test.

[0007] As one implementation method, the preset secondary instrument calibration method corresponding to the target call sequence is invoked to calibrate the target measurement index of the secondary instrument under test. This includes: determining the preset secondary instrument calibration method corresponding to the target call sequence as the first whole-machine calibration method; determining multiple first calibration points based on the measurement range of dissolved oxygen concentration; each first calibration point corresponds to a different first standard dissolved oxygen concentration value; under the preset whole-machine environment, detecting the dissolved oxygen concentration measurement value of the secondary instrument under test in the measurement environment corresponding to each first calibration point to obtain multiple first dissolved oxygen concentration measurement values; characterizing the measurement environment by simulating different dissolved oxygen concentration values ​​in the water sample by mixing oxygen mixtures of different preset concentrations; determining the difference between the first dissolved oxygen concentration measurement value and the first standard dissolved oxygen concentration value corresponding to different first calibration points to obtain multiple first dissolved oxygen concentration errors; and selecting the first target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error from the multiple first dissolved oxygen concentration errors to obtain the first measurement accuracy result.

[0008] In this implementation, the secondary instrument under test is installed within the original overall measurement system. This allows for a more macroscopic and practical evaluation of the accuracy, reliability, and stability of its final output. The overall system calibration method overcomes the limitations of individual calibration in assessing the compatibility and environmental adaptability of the primary (sensor) and secondary instruments, establishing a complete and comprehensive instrument performance evaluation system. Only through both individual calibration (ensuring its own measurement accuracy) and overall system calibration (system collaboration) can the reliability of the trace dissolved oxygen meter's measurement results be better guaranteed.

[0009] As one implementation method, the preset secondary instrument calibration method corresponding to the target call sequence is determined as the second current-to-dissolved oxygen relationship calibration method; based on the linear relationship between the current signal and the dissolved oxygen concentration, multiple second calibration points are determined; multiple second calibration points correspond to multiple second current signals that can uniformly cover the entire dissolved oxygen concentration range; the corresponding second current signals of each second calibration point are input into the secondary instrument under test to detect the dissolved oxygen concentration value, resulting in multiple second dissolved oxygen concentration measurements; based on the nonlinear relationship between the current signal and the dissolved oxygen concentration, a target current-dissolved oxygen mapping curve model is established; the current signals corresponding to the multiple second calibration points are input into the target current-dissolved oxygen mapping curve model, resulting in multiple second standard dissolved oxygen concentration values; the difference between the second dissolved oxygen concentration measurements corresponding to each second calibration point and the second standard dissolved oxygen concentration values ​​is determined, resulting in multiple second dissolved oxygen concentration errors; and from the multiple second dissolved oxygen concentration errors, the second target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error is selected to obtain the second measurement accuracy result.

[0010] In this embodiment, the secondary instrument is completely separated from the sensor to which it is connected, and a separate, more accurate, and absolutely reliable current standard source is used to simulate the sensor signal, thereby verifying the accuracy of the algorithm and mapping curve inside the secondary instrument independently.

[0011] As one implementation method, a target current-dissolved oxygen mapping curve model is established based on the nonlinear relationship between the current signal and the dissolved oxygen concentration. This includes: pre-setting multiple dissolved oxygen calibration points; these multiple calibration points represent multiple dissolved oxygen concentration values ​​that can uniformly cover the dissolved oxygen concentration from trace to saturation; determining the standard current signal corresponding to each dissolved oxygen calibration point; obtaining a multi-point calibration dataset based on the multiple standard current signals and their corresponding dissolved oxygen concentration values; fitting the nonlinear relationship between the current signal and the dissolved oxygen concentration using a pre-set algorithm to construct an initial curve model; and training the initial curve model based on the multi-point calibration dataset to obtain the target current-dissolved oxygen mapping curve model.

[0012] In this implementation, theoretically there is a linear relationship between the current signal and the dissolved oxygen concentration. However, in the environment, the relationship between the current signal and the dissolved oxygen concentration is non-linear. By establishing a current-dissolved oxygen mapping curve model, the accurate dissolved oxygen concentration corresponding to the current signal can be determined intelligently. Based on this, the calibration of the secondary instrument under test can be performed more accurately to verify whether the compensation algorithm inside the secondary instrument under test is accurate, thereby obtaining the calibration result more efficiently and accurately.

[0013] As one implementation method, the preset secondary instrument calibration method corresponding to the target call sequence is determined as the third temperature signal calibration method; based on the linear relationship between resistance signal and temperature, multiple third calibration points are determined; multiple third calibration points represent multiple first resistance signals that can uniformly cover the entire temperature range; multiple third calibration points correspond to multiple third standard temperature values; the first resistance signals corresponding to each third calibration point are input into the temperature value detected by the secondary instrument under test to obtain multiple third temperature measurement values; the sum and difference between the third temperature measurement values ​​corresponding to different third calibration points and the third standard temperature values ​​are determined to obtain multiple third temperature errors; and from the multiple third temperature errors, the third target temperature error value with the largest temperature error is selected to obtain the third measurement accuracy result.

[0014] In this embodiment, since dissolved oxygen concentration is affected by temperature, verifying the accuracy of the dissolved oxygen concentration readings of the secondary instrument requires verifying the accuracy of the temperature measurement. When a dissolved oxygen meter is inaccurate, the problem may lie with the dissolved oxygen sensor itself or with the temperature sensor. Therefore, this temperature calibration method, by directly inputting a standard resistance signal, perfectly isolates the external temperature sensor, allowing for a more direct verification of the temperature measurement accuracy of the secondary instrument.

[0015] As one implementation method, the preset secondary instrument calibration method corresponding to the target call sequence is determined as the fourth temperature compensation signal calibration method; multiple fourth calibration points are determined; each fourth calibration point corresponds to a different fourth current signal and a second resistance signal; an identical fourth current signal is matched with multiple different second resistance signals; a temperature dynamic compensation model is constructed based on the correlation between dissolved oxygen concentration and temperature; the fourth current signal and the second resistance signal corresponding to each fourth calibration point are input into the temperature dynamic compensation model to obtain multiple fourth standard dissolved oxygen concentration values; the fourth current signal and the second resistance signal corresponding to each fourth calibration point are input into the secondary instrument under test to detect the dissolved oxygen concentration value to obtain multiple fourth dissolved oxygen concentration measurement values; the sum and difference between the fourth dissolved oxygen concentration measurement values ​​and the fourth standard dissolved oxygen concentration values ​​corresponding to different fourth calibration points are determined to obtain multiple fourth dissolved oxygen concentration errors; and from the multiple fourth dissolved oxygen concentration errors, the fourth target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error is selected to obtain the fourth measurement accuracy result.

[0016] In this implementation, a multi-dimensional test environment is constructed by synchronously and in pairs inputting simulated oxygen and temperature signals. This allows for direct verification of the accuracy of the internal temperature dynamic compensation model of the secondary instrument, ensuring the reliability of the instrument's output results under various real and complex operating conditions.

[0017] According to a second aspect of the present invention, a calibration system for a secondary instrument of a trace dissolved oxygen meter is provided, the system comprising:

[0018] The whole machine calibration module is configured to calibrate the dissolved oxygen concentration measurement accuracy of the secondary instrument under test in a preset whole machine environment according to the first whole machine calibration method, and obtain the first measurement accuracy result.

[0019] The current-to-dissolved oxygen relationship verification module is configured to verify the dissolved oxygen concentration measurement accuracy of the secondary instrument under test according to the second current-to-dissolved oxygen relationship verification method, and obtain the second measurement accuracy result.

[0020] The temperature signal verification module is configured to verify the temperature measurement accuracy of the secondary instrument under test according to the third temperature signal verification method, and obtain the third measurement accuracy result.

[0021] The temperature compensation signal verification module is configured to verify the dissolved oxygen concentration measurement accuracy of the secondary instrument under test after temperature compensation according to the fourth temperature compensation signal verification method, and obtain the fourth measurement accuracy result.

[0022] The control and data processing module is configured to determine the target priority of various preset secondary instrument calibration methods based on the measurement indicators of the secondary instrument under test; according to the target priority, call each preset secondary instrument calibration method to calibrate each measurement indicator of the secondary instrument under test and obtain a calibration report.

[0023] The calibration system for the secondary instrument of the trace dissolved oxygen meter is configured to perform a calibration method for the secondary instrument of the trace dissolved oxygen meter as described in the first aspect and any possible implementation thereof.

[0024] According to a third aspect of the present invention, a calibration device for a secondary instrument of a trace dissolved oxygen meter is provided, the device being configured to perform a calibration method for a secondary instrument of a trace dissolved oxygen meter as described in the first aspect and any possible implementation thereof.

[0025] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, on which instructions are stored, such that when the instructions in the computer-readable storage medium are executed by a processor of a calibration device for a trace dissolved oxygen meter secondary instrument, the calibration device for the trace dissolved oxygen meter secondary instrument is able to perform a calibration method for a trace dissolved oxygen meter secondary instrument as described in the first aspect and any possible implementation thereof.

[0026] According to a fifth aspect of the present disclosure, a computer program product is provided, the computer program product including computer instructions, which, when executed on a calibration device for a trace dissolved oxygen meter secondary instrument, cause the calibration device for the trace dissolved oxygen meter secondary instrument to perform the calibration method for the trace dissolved oxygen meter secondary instrument described in the first aspect and any possible implementation thereof.

[0027] The technical solution provided by the embodiments of the present invention brings at least the following beneficial effects: In order to ensure the accuracy of the calibration of the trace dissolved oxygen meter, in addition to the whole-machine calibration of the trace dissolved oxygen meter, a calibration method for the secondary instrument of the trace dissolved oxygen meter is added, thereby improving the calibration process of the trace dissolved oxygen meter. The calibration method of the secondary instrument includes a first whole-machine calibration method, a second current-to-dissolved oxygen relationship calibration method, a third temperature signal calibration method, and a fourth temperature compensation signal calibration method. Based on the calibration logic dependency relationship of different measurement indicators of the secondary instrument, from basic single measurement indicator calibration, such as the dissolved oxygen concentration measurement accuracy and temperature measurement accuracy of the secondary instrument, to complex composite measurement indicators, such as the dissolved oxygen concentration measurement accuracy after temperature compensation, the target priority of each secondary instrument calibration method is preset. In this way, the priority mechanism provides decision logic for the automated calibration system, reduces manual intervention and subjective judgment, and significantly improves the integrity, efficiency and intelligence level of the calibration. Furthermore, during the calibration process, different secondary instrument calibration methods operate independently, automatically matching different measurement indicators output by the secondary instruments and independently verifying their measurement indicators. This avoids cross-interference of signals, ensuring the accuracy and stability of signal input during calibration. Based on a preset target priority order, the secondary instruments are calibrated sequentially, yielding multi-dimensional and multi-indicator calibration results. This ensures the comprehensiveness of the secondary instrument calibration and improves the accuracy and reliability of the trace dissolved oxygen meter's measurement results. This further provides technical support for real-time and accurate monitoring of power plant water and steam systems, reduces the risk of equipment corrosion due to measurement errors, and extends the service life of generator sets.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure, and are not intended to unduly limit this disclosure.

[0030] Figure 1 This is a schematic diagram illustrating a calibration system for a secondary instrument of a trace dissolved oxygen meter according to an exemplary embodiment;

[0031] Figure 2This is a flowchart illustrating a calibration method for a secondary instrument of a trace dissolved oxygen meter according to an exemplary embodiment;

[0032] Figure 3 This is a schematic diagram of a calibration device for a secondary instrument of a trace dissolved oxygen meter, according to an exemplary embodiment. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0034] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0035] Before providing a detailed description of the calibration method for the secondary instrument of the trace dissolved oxygen meter provided in this application embodiment, let's briefly introduce the application scenarios and implementation environment involved in this application embodiment.

[0036] Research has revealed that large-capacity generator units have extremely high requirements for steam and water quality. Accurate monitoring of steam and water quality is essential for ensuring the safe and economical operation of thermal power generating units. However, due to the difficulty in calibrating the accuracy of most online chemical instruments, steam and water quality deterioration cannot be detected in a timely manner, leading to corrosion, scaling, and salt accumulation in the generator unit's steam and water system, resulting in significant economic losses. While many power plants achieve high steam and water quality compliance rates, corrosion, scaling, and salt accumulation problems are still quite serious. The root cause lies in the measurement errors of online chemical instruments, necessitating regular calibration, particularly for trace dissolved oxygen meters, whose calibration accuracy is insufficient.

[0037] Currently, the calibration method for trace dissolved oxygen meters, which are used to test water vapor quality, only involves calibrating the primary and secondary instruments of the trace dissolved oxygen meter as a whole unit. There is a lack of independent calibration of the secondary instrument of the trace dissolved oxygen meter, which makes it difficult to detect the measurement deviation of the trace dissolved oxygen meter, resulting in inaccurate measurement results, low measurement accuracy and poor reliability. Consequently, the problem of water vapor quality deterioration cannot be detected in time, causing corrosion, scaling and salt accumulation in the water vapor system of the generator set.

[0038] To address the aforementioned issues, this application proposes a calibration method for the secondary instrument of a trace dissolved oxygen meter. This method establishes multiple calibration modes for the secondary instrument, considering its accuracy in dissolved oxygen concentration measurement, temperature measurement, and temperature-compensated dissolved oxygen concentration measurement. It automatically matches different measurement indicators output by the secondary instrument, independently verifying each indicator. During the calibration process, different calibration modes operate independently, avoiding cross-interference of signals and ensuring the accuracy and stability of signal input during calibration. Finally, it integrates all calibration results to obtain a secondary instrument calibration report, thereby improving the accuracy and reliability of the trace dissolved oxygen meter's measurement results.

[0039] Secondly, the implementation architecture involved in this application will be briefly introduced below.

[0040] Figure 1 This is a schematic diagram of a calibration system for a secondary instrument of a trace dissolved oxygen meter provided in this application. Figure 1 As shown, the calibration system of the secondary instrument of the trace dissolved oxygen meter includes a whole machine calibration module 11, a current-to-dissolved oxygen relationship calibration module 12, a temperature signal calibration module 13, a temperature compensation signal calibration module 14, and a control and data processing module 15.

[0041] The aforementioned whole machine verification module 11, current-to-dissolved oxygen relationship verification module 12, temperature signal verification module 13, temperature compensation signal verification module 14, and control and data processing module 15 are connected via wired or wireless communication.

[0042] The whole machine calibration module 11 is configured to calibrate the dissolved oxygen concentration measurement accuracy of the secondary instrument under test in a preset whole machine environment according to the first whole machine calibration method, and obtain the first measurement accuracy result.

[0043] The current-to-dissolved oxygen relationship verification module 12 is configured to verify the dissolved oxygen concentration measurement accuracy of the secondary instrument under test according to the second current-to-dissolved oxygen relationship verification method, and obtain the second measurement accuracy result.

[0044] The temperature signal verification module 13 is configured to verify the temperature measurement accuracy of the secondary instrument under test according to the third temperature signal verification method, and obtain the third measurement accuracy result.

[0045] The temperature compensation signal verification module 14 is configured to verify the dissolved oxygen concentration measurement accuracy of the secondary instrument under test after temperature compensation according to the fourth temperature compensation signal verification method, and obtain the fourth measurement accuracy result.

[0046] The control and data processing module 15 is configured to determine the target priority of various preset secondary instrument calibration methods based on the measurement indicators of the secondary instrument under test; according to the target priority, call each preset secondary instrument calibration method to calibrate each measurement indicator of the secondary instrument under test and obtain a calibration report.

[0047] In one implementation, the whole-machine calibration module 11, the current-to-dissolved oxygen relationship calibration module 12, the temperature signal calibration module 13, the temperature compensation signal calibration module 14, and the control and data processing module 15 are connected to the secondary instrument under test. After powering on and starting the calibration system, the control and data processing module 15 initiates a self-test program to confirm that the connection channels between each module are working properly. Subsequently, each calibration module performs a single calibration task, records the measured data in real time, and determines the calibration result. After completing all calibration tasks, the calibration system automatically generates a calibration report based on the calibration results of each calibration module, indicating whether the calibration accuracy of the secondary instrument under test is qualified, and uploads the calibration report to the main control system through the communication interface.

[0048] In this implementation, data synchronization between modules is achieved through high-precision interface circuits, ensuring stable and reliable signal transmission and avoiding calibration deviations caused by communication delays or interference. The instrument feedback signal is input to the control system, which outputs corresponding concentration signals, actual temperature conditions, and temperature compensation through self-matching and self-learning functions to perform overall accuracy verification of the instrument under test. The system automatically compares the output data deviation and adjusts the calibration parameters according to the preset algorithm to ensure that the secondary instrument has stable and reliable measurement accuracy across the entire range. Based on this, a dynamic compensation mechanism is further introduced to correct the measured value in real time according to changes in environmental parameters, effectively reducing measurement errors caused by temperature fluctuations, air pressure changes, or sensor aging. The dynamic compensation mechanism relies on a high-precision environmental sensing unit and a historical data learning model to continuously optimize the calibration curve, improving the long-term stability and reliability of the instrument. The entire calibration process requires no manual intervention, achieving fully automatic closed-loop calibration.

[0049] The calibration system for the secondary instrument of this trace dissolved oxygen meter is configured to determine the target priority of multiple preset secondary instrument calibration methods based on the measurement indicators of the secondary instrument under test. The target priority represents the order in which the various preset secondary instrument calibration methods are invoked for calibration. The multiple preset secondary instrument calibration methods include: a first whole-machine calibration method, a second current-to-dissolved oxygen relationship calibration method, a third temperature signal calibration method, and a fourth temperature-compensated signal calibration method. According to the target priority, each preset secondary instrument calibration method is invoked to calibrate each measurement indicator of the secondary instrument under test, and a calibration report is obtained. The multiple measurement indicators include one or more of the following: dissolved oxygen concentration measurement value, temperature measurement value, or temperature-compensated dissolved oxygen concentration measurement value. One preset secondary instrument calibration method corresponds to one measurement indicator.

[0050] As one implementation method, according to the target priority, each preset secondary instrument calibration method is invoked to calibrate each measurement index of the secondary instrument under test, and a calibration report is obtained. This includes: according to the calling sequence of the target priority, the preset secondary instrument calibration method corresponding to the target calling sequence is invoked to calibrate the target measurement index of the secondary instrument under test, and a measurement accuracy result is obtained. The measurement accuracy result represents the measurement error value of the secondary instrument under test for the target measurement index. The measurement accuracy result includes the first measurement accuracy result corresponding to the first whole machine calibration method, the second measurement accuracy result corresponding to the second current-to-dissolved oxygen relationship calibration method, the third measurement accuracy result corresponding to the third temperature signal calibration method, and the fourth measurement accuracy result corresponding to the fourth temperature compensation signal calibration method. If the target measurement error value of the target measurement accuracy result exceeds the preset error range, the calibration report is determined to indicate that the secondary instrument under test has a fault, and the calibration ends. Otherwise, the preset secondary instrument calibration method corresponding to the next level calling sequence is invoked to calibrate the measurement index corresponding to the secondary instrument under test, until all preset secondary instrument calibration methods are traversed, and measurement accuracy results corresponding to multiple measurement indexes are obtained. The calibration report of the secondary instrument under test is then determined to be the measurement accuracy result corresponding to all measurement indexes.

[0051] As one implementation method, based on the feedback signal of the secondary instrument under test, the target priority of multiple preset secondary instrument calibration methods is determined, including: determining the first whole-machine calibration method as the highest priority; the fourth temperature compensation signal calibration method as the lowest priority; and determining the priority level of the second current-to-dissolved oxygen relationship calibration method and the third temperature signal calibration method based on the measurement indicators of the secondary instrument under test.

[0052] As one implementation method, the preset secondary instrument calibration method corresponding to the target call sequence is invoked to calibrate the target measurement index of the secondary instrument under test. This includes: determining the preset secondary instrument calibration method corresponding to the target call sequence as the first whole-machine calibration method; determining multiple first calibration points based on the measurement range of dissolved oxygen concentration; each first calibration point corresponds to a different first standard dissolved oxygen concentration value; under the preset whole-machine environment, detecting the dissolved oxygen concentration measurement value of the secondary instrument under test in the measurement environment corresponding to each first calibration point to obtain multiple first dissolved oxygen concentration measurement values; characterizing the measurement environment by simulating different dissolved oxygen concentration values ​​in a water sample by mixing oxygen mixtures of different preset concentrations; determining the difference between the first dissolved oxygen concentration measurement value and the first standard dissolved oxygen concentration value corresponding to different first calibration points to obtain multiple first dissolved oxygen concentration errors; and selecting the first target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error from the multiple first dissolved oxygen concentration errors to obtain the first measurement accuracy result.

[0053] As one implementation method, the preset secondary instrument calibration method corresponding to the target call sequence is determined as the second current-to-dissolved oxygen relationship calibration method; based on the linear relationship between the current signal and the dissolved oxygen concentration, multiple second calibration points are determined; multiple second calibration points correspond to multiple second current signals that can uniformly cover the entire dissolved oxygen concentration range; the corresponding second current signals of each second calibration point are input into the secondary instrument under test to detect the dissolved oxygen concentration value, resulting in multiple second dissolved oxygen concentration measurements; based on the nonlinear relationship between the current signal and the dissolved oxygen concentration, a target current-dissolved oxygen mapping curve model is established; the current signals corresponding to the multiple second calibration points are input into the target current-dissolved oxygen mapping curve model, resulting in multiple second standard dissolved oxygen concentration values; the difference between the second dissolved oxygen concentration measurements corresponding to each second calibration point and the second standard dissolved oxygen concentration values ​​is determined, resulting in multiple second dissolved oxygen concentration errors; and from the multiple second dissolved oxygen concentration errors, the second target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error is selected to obtain the second measurement accuracy result.

[0054] As one implementation method, a target current-dissolved oxygen mapping curve model is established based on the nonlinear relationship between the current signal and the dissolved oxygen concentration. This includes: pre-setting multiple dissolved oxygen calibration points; these multiple calibration points represent multiple dissolved oxygen concentration values ​​that can uniformly cover the range from trace to saturation; determining the standard current signal corresponding to each dissolved oxygen calibration point; obtaining a multi-point calibration dataset based on the multiple standard current signals and their corresponding dissolved oxygen concentration values; fitting the nonlinear relationship between the current signal and the dissolved oxygen concentration using a pre-set algorithm to construct an initial curve model; and training the initial curve model based on the multi-point calibration dataset to obtain the target current-dissolved oxygen mapping curve model.

[0055] As one implementation method, the preset secondary instrument calibration method corresponding to the target call sequence is determined as the third temperature signal calibration method; based on the linear relationship between resistance signal and temperature, multiple third calibration points are determined; multiple third calibration points represent multiple first resistance signals that can uniformly cover the entire temperature range; multiple third calibration points correspond to multiple third standard temperature values; the first resistance signals corresponding to each third calibration point are input into the temperature value detected by the secondary instrument under test to obtain multiple third temperature measurement values; the sum and difference between the third temperature measurement values ​​corresponding to different third calibration points and the third standard temperature values ​​are determined to obtain multiple third temperature errors; and from the multiple third temperature errors, the third target temperature error value with the largest temperature error is selected to obtain the third measurement accuracy result.

[0056] As one implementation method, the preset secondary instrument calibration method corresponding to the target call sequence is determined to be the fourth temperature compensation signal calibration method; multiple fourth calibration points are determined; each fourth calibration point corresponds to a different fourth current signal and a second resistance signal; one identical fourth current signal is matched with multiple different second resistance signals; a temperature dynamic compensation model is constructed based on the correlation between dissolved oxygen concentration and temperature; the fourth current signal and the second resistance signal corresponding to each fourth calibration point are input into the temperature dynamic compensation model to obtain multiple fourth standard dissolved oxygen concentration values; the fourth current signal and the second resistance signal corresponding to each fourth calibration point are input into the secondary instrument under test to detect the dissolved oxygen concentration value to obtain multiple fourth dissolved oxygen concentration measurement values; the sum and difference between the fourth dissolved oxygen concentration measurement values ​​corresponding to different fourth calibration points and the fourth standard dissolved oxygen concentration values ​​are determined to obtain multiple fourth dissolved oxygen concentration errors; and from the multiple fourth dissolved oxygen concentration errors, the fourth target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error is selected to obtain the fourth measurement accuracy result.

[0057] For ease of understanding, the calibration method of the secondary instrument of the trace dissolved oxygen meter provided in this application will be described in detail below with reference to the accompanying drawings.

[0058] Figure 2 This is a flowchart illustrating a calibration method for a secondary instrument of a trace dissolved oxygen meter according to an exemplary embodiment, such as... Figure 2 As shown, the calibration method for the secondary instrument of the trace dissolved oxygen meter includes the following steps.

[0059] S21, based on the measurement indicators of the secondary instrument under test, determine the target priority of various preset secondary instrument calibration methods.

[0060] The target priority indicates the order in which the various preset secondary instrument verification methods are invoked for verification.

[0061] Multiple preset secondary instrument calibration methods include: first, whole-machine calibration method; second, current-to-dissolved oxygen relationship calibration method; third, temperature signal calibration method; and fourth, temperature compensation signal calibration method.

[0062] Multiple measurement indicators include one or more of the following: dissolved oxygen concentration measurement, temperature measurement, or temperature-compensated dissolved oxygen concentration measurement.

[0063] A preset secondary instrument calibration method corresponds to a measurement index.

[0064] The trace dissolved oxygen meter consists of a primary instrument and a secondary instrument. The primary instrument is composed of multiple detection sensors, and the secondary instrument receives the detection signal transmitted by the primary instrument and converts the signal into the corresponding measurement value.

[0065] Specifically, the first whole-machine verification method is determined to be the highest priority; the fourth temperature compensation signal verification method is the lowest priority; and the priority levels of the second current-to-dissolved oxygen relationship verification method and the third temperature signal verification method are determined according to the measurement indicators of the secondary instrument under test.

[0066] In one implementation, the calibration process of the secondary instrument under test is performed by calling calibration methods according to a preset priority order. The first whole-machine calibration method verifies whether the secondary instrument under test can correctly and promptly receive the detection signal sent by the primary instrument when the micro-dissolved oxygen meter is running. If the secondary instrument under test cannot correctly display the measured value of the measured index under the micro-dissolved oxygen meter running environment, confirming a fault in the secondary instrument under test, then subsequent independent calibration results are invalid. Therefore, the first whole-machine calibration method has the highest priority. The fourth temperature compensation signal calibration method verifies that after the secondary instrument under test can accurately measure dissolved oxygen concentration and water temperature, it investigates the correlation between dissolved oxygen concentration and temperature to determine whether the secondary instrument under test can accurately determine the dissolved oxygen concentration after temperature changes. The fourth temperature compensation signal calibration method can only be performed after confirming that the dissolved oxygen concentration calibration and temperature calibration of the secondary instrument under test are normal. Therefore, the fourth temperature compensation signal calibration method has the lowest priority. The second current-to-dissolved oxygen relationship verification method and the third temperature signal verification method have the same priority level. The priority order of the two can be preset according to the actual use environment or the verification requirements of the measurement indicators of the secondary instrument under test.

[0067] S22, according to the target priority, call the preset secondary instrument calibration methods to calibrate each measurement index of the secondary instrument under test and obtain a calibration report.

[0068] The calibration report indicates that the secondary instrument under test has a fault, or that the calibration results show the measurement accuracy of each measurement index of the secondary instrument under test in all calibration results.

[0069] One implementation of determining the verification report specifically includes the following two steps:

[0070] First, according to the priority of the target, the preset secondary instrument verification method corresponding to the target call order is called to verify the target measurement index of the secondary instrument under test and obtain the measurement accuracy result.

[0071] The measurement accuracy result characterizes the measurement error value of the secondary instrument under test for the target measurement index. The measurement accuracy result includes: the first measurement accuracy result corresponding to the first whole-machine calibration method, the second measurement accuracy result corresponding to the second current-to-dissolved oxygen relationship calibration method, the third measurement accuracy result corresponding to the third temperature signal calibration method, and the fourth measurement accuracy result corresponding to the fourth temperature compensation signal calibration method.

[0072] Secondly, it detects whether the target measurement error value of the target measurement accuracy result exceeds the preset error range.

[0073] If the target measurement error value exceeds the preset error range, the calibration report indicates that the secondary instrument under test is faulty, and the calibration ends.

[0074] If the target measurement error value is within the preset error range, the preset secondary instrument verification method corresponding to the next level call sequence is called to verify the measurement index of the secondary instrument under test, until all preset secondary instrument verification methods are traversed, the measurement accuracy results corresponding to multiple measurement indexes are obtained, and the verification report of the secondary instrument under test is determined to be the measurement accuracy results corresponding to all measurement indexes.

[0075] Understandably, the secondary instrument calibration methods are invoked sequentially according to priority, with each method corresponding to a different measurement specification of the secondary instrument. Each calibration method pre-sets multiple calibration points based on the measurement range of the calibration specification. The input signal at each calibration point corresponds to a different standard value, and these multiple calibration points evenly cover the entire measurement range of the calibration specification, ensuring the comprehensiveness of the calibration process. The measured value obtained by the secondary instrument from the input signal is compared with the standard value to determine the measurement accuracy of the secondary instrument. The calibration methods are performed sequentially, and the result of the higher-priority calibration determines whether to proceed to the next higher-priority calibration.

[0076] Specifically, the specific verification methods for each preset secondary instrument verification method are as follows: four verification methods.

[0077] First, the preset secondary instrument verification method corresponding to the target call sequence is determined to be the first whole machine verification method.

[0078] Based on the measurement range of dissolved oxygen concentration, multiple first calibration points are determined; each first calibration point corresponds to a different first standard dissolved oxygen concentration value; under a preset overall environment, the dissolved oxygen concentration measurement values ​​of the secondary instrument under test are detected in the measurement environment corresponding to each first calibration point, resulting in multiple first dissolved oxygen concentration measurement values; the differences between the first dissolved oxygen concentration measurement values ​​corresponding to different first calibration points and the first standard dissolved oxygen concentration values ​​are determined, resulting in multiple first dissolved oxygen concentration errors. From these multiple first dissolved oxygen concentration errors, the first target dissolved oxygen concentration error value with the largest error is selected to obtain the first measurement accuracy result.

[0079] Among them, the environmental characterization measurement simulates different dissolved oxygen concentrations in water samples by mixing oxygen mixtures with different preset concentrations.

[0080] In one implementation, the measurement environment can be selected in three ways.

[0081] First, a standard trace dissolved oxygen gas calibration environment is established. By mixing oxygen and nitrogen gases of different concentrations, the dissolved oxygen content in actual water samples is simulated. This allows for the preset of multiple standard dissolved oxygen concentration values. By comparing the measured values ​​of the secondary instrument under test in the preset environment with the standard dissolved oxygen concentration values, the measurement accuracy is determined.

[0082] Second, high-precision reference instruments are used for synchronous measurement, and the measurement accuracy level of the tested instruments is evaluated by data comparison.

[0083] Third, the overall performance of the instrument is tested under simulated real-world measurement conditions, taking into account factors such as temperature, pressure, and flow rate, to recreate the actual operating conditions. This verifies the stability and reliability of the secondary instruments in complex environments.

[0084] In this implementation, the secondary instrument under test is installed within the original overall measurement system. This allows for a more macroscopic and practical evaluation of the accuracy, reliability, and stability of its final output. The overall system calibration method overcomes the limitations of individual calibration in assessing the compatibility and environmental adaptability of the primary (sensor) and secondary instruments, establishing a complete and comprehensive instrument performance evaluation system. Only through both individual calibration (ensuring its own measurement accuracy) and overall system calibration (system collaboration) can the reliability of the trace dissolved oxygen meter's measurement results be better guaranteed.

[0085] Secondly, the preset secondary instrument verification method corresponding to the target call sequence is determined to be the dissolved oxygen relationship verification method corresponding to the second current.

[0086] Based on the linear relationship between the current signal and dissolved oxygen concentration, multiple second calibration points are determined. These second calibration points correspond to multiple second current signals that can uniformly cover the entire dissolved oxygen concentration range. The corresponding second current signals of each second calibration point are input into the secondary instrument under test to detect the dissolved oxygen concentration value, resulting in multiple second dissolved oxygen concentration measurements. Based on the nonlinear relationship between the current signal and dissolved oxygen concentration, a target current-dissolved oxygen mapping curve model is established. The current signals corresponding to the multiple second calibration points are input into the target current-dissolved oxygen mapping curve model, resulting in multiple second standard dissolved oxygen concentration values. The difference between the second dissolved oxygen concentration measurements corresponding to each second calibration point and the second standard dissolved oxygen concentration values ​​is determined, resulting in multiple second dissolved oxygen concentration errors. From these multiple second dissolved oxygen concentration errors, the second target dissolved oxygen concentration error value with the largest error is selected to obtain the second measurement accuracy result.

[0087] In one implementation, multiple calibration points are set during the calibration process to accurately simulate the entire process from trace to saturated dissolved oxygen. A high-precision current source outputs a standard current signal corresponding to the trace dissolved oxygen concentration to accurately simulate the sensor's output at different oxygen concentrations, thereby verifying the secondary instrument's ability to resolve current signals and its linear response characteristics.

[0088] The specific process for establishing the target current-dissolved oxygen mapping curve model is as follows.

[0089] Multiple dissolved oxygen calibration points are preset; these calibration points represent multiple dissolved oxygen concentration values ​​that can uniformly cover the range from trace to saturation; the standard current signal corresponding to each dissolved oxygen calibration point is determined; based on the multiple standard current signals and their corresponding dissolved oxygen concentration values, a multi-point calibration dataset is obtained; a preset algorithm is used to fit the nonlinear relationship between the current signal and the dissolved oxygen concentration to construct an initial curve model; based on the multi-point calibration dataset, the initial curve model is trained to obtain the target current-dissolved oxygen mapping curve model.

[0090] In this implementation, traditional calibration methods assume a perfect linear relationship between current and dissolved oxygen concentration. However, in reality, due to sensor aging, component characteristics, and other factors, this relationship is often non-linear. Therefore, establishing a target current-dissolved oxygen mapping curve model more closely reflects the actual physical characteristics of the sensor. This ensures higher calibration accuracy and better reflects reality for this current-to-dissolved oxygen relationship calibration method. Furthermore, establishing the target mapping curve model allows the entire calibration process, from input current to obtaining the standard value, to be automated, reducing errors that may be introduced by manual table lookups and calculations, and improving calibration efficiency and consistency.

[0091] Third, the preset secondary instrument verification method corresponding to the target call sequence is determined to be the third temperature signal verification method.

[0092] Based on the linear relationship between resistance signal and temperature, multiple third calibration points are determined. These multiple third calibration points represent multiple first resistance signals that can uniformly cover the entire temperature range. Each of the multiple third calibration points corresponds to a multiple third standard temperature value. The first resistance signal corresponding to each third calibration point is input into the temperature value detected by the secondary instrument under test to obtain multiple third temperature measurement values. The sum and difference between the third temperature measurement values ​​corresponding to different third calibration points and the third standard temperature values ​​are determined to obtain multiple third temperature errors. From the multiple third temperature errors, the third target temperature error value with the largest temperature error is selected to obtain the third measurement accuracy result.

[0093] In one embodiment, the trace dissolved oxygen meter temperature signal calibration system calibrates the secondary instrument of the trace dissolved oxygen analyzer using a controllable signal. It accurately calibrates the temperature measurement accuracy of the secondary instrument by sending a resistance-simulated signal. The temperature sensor output signal can be simulated in two ways: directly inputting a resistor or using different temperature sensors to simulate the output signal, such as PT100, PT1000, and various thermistor temperature sensors. The two methods are detailed below:

[0094] One approach is to directly input a resistor and output its resistance value, with an output range of 0.01Ω to 1MΩ and an accuracy of 0.01%, thus simulating the signal output by a temperature sensor through the resistance signal.

[0095] Another method is to directly input the temperature. The instrument will calculate the resistance of the sensor used at that temperature and display and output the corresponding temperature signal.

[0096] In this embodiment, since dissolved oxygen concentration is affected by temperature, verifying the accuracy of the dissolved oxygen concentration readings of the secondary instrument requires verifying the accuracy of the temperature measurement. When a dissolved oxygen meter is inaccurate, the problem may lie with the dissolved oxygen sensor itself or with the temperature sensor. Therefore, this temperature calibration method, by directly inputting a standard resistance signal, perfectly isolates the external temperature sensor, allowing for a more direct verification of the temperature measurement accuracy of the secondary instrument.

[0097] Fourth, the preset secondary instrument verification method corresponding to the target call sequence is determined to be the fourth temperature compensation signal verification method.

[0098] Multiple fourth calibration points are identified; each fourth calibration point corresponds to a different fourth current signal and a second resistance signal; an identical fourth current signal is matched with multiple different second resistance signals; a temperature dynamic compensation model is constructed based on the correlation between dissolved oxygen concentration and temperature; the fourth current signal and second resistance signal corresponding to each fourth calibration point are input into the temperature dynamic compensation model to obtain multiple fourth standard dissolved oxygen concentration values; the fourth current signal and second resistance signal corresponding to each fourth calibration point are input into the secondary instrument under test to detect the dissolved oxygen concentration value, resulting in multiple fourth dissolved oxygen concentration measurements; the sum and difference between the fourth dissolved oxygen concentration measurements and the fourth standard dissolved oxygen concentration values ​​at different fourth calibration points are determined to obtain multiple fourth dissolved oxygen concentration errors; and from these multiple fourth dissolved oxygen concentration errors, the fourth target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error is selected to obtain the fourth measurement accuracy result.

[0099] The relationship between dissolved oxygen concentration and temperature is as follows: under the same pressure, the higher the water temperature, the less oxygen can dissolve in the water (solubility decreases); the lower the water temperature, the more oxygen can dissolve in the water (solubility increases). However, the permeability of the dissolved oxygen sensor membrane to oxygen changes with temperature. The higher the temperature, the faster oxygen diffuses through the membrane to the electrodes.

[0100] The effects of temperature on water solubility and on the sensor itself show opposite trends. As temperature increases, solubility decreases, leading to a downward trend in instrument readings; however, increased sensor membrane permeability and reaction rate result in an upward trend in instrument readings. Therefore, temperature compensation is necessary, requiring correction of the sensor's thermosensitive characteristics based on the temperature value. Consequently, the temperature compensation algorithm of the secondary instrument must be validated.

[0101] In one implementation, a dynamic compensation model is constructed based on a mathematical model of dissolved oxygen changing with temperature. The model automatically calculates and outputs a standard signal after temperature compensation to verify the effectiveness and accuracy of the instrument compensation algorithm. The system has a multi-segment temperature point setting function, which can continuously simulate the heating and cooling process, detect the response stability of the instrument in a variable temperature environment, effectively ensure the reliability of the calibration data, and ensure the stability and reliability of the measurement results under variable temperature conditions. The two work together to improve the adaptability and accuracy of the secondary instrument under complex working conditions.

[0102] In this implementation, a multi-dimensional test environment is constructed by synchronously and in pairs inputting simulated oxygen and temperature signals. This allows for direct verification of the accuracy of the internal temperature dynamic compensation model of the secondary instrument, ensuring the reliability of the instrument's output results under various real and complex operating conditions.

[0103] All four calibration methods for secondary instruments described above involve establishing multiple calibration points based on the measurement parameters to ensure uniform coverage of the measurement range and comprehensive measurement accuracy. Furthermore, each calibration point corresponds to a standard value and the secondary instrument's measured value. The error value corresponding to each calibration point is determined, and the maximum error is selected, adhering to the "worst-case scenario principle" in metrological calibration, thus ensuring the conservatism and reliability of the calibration conclusions. If the error at any calibration point within the measurement range exceeds the allowable range, the entire measurement parameter is deemed unqualified, indicating a fault in the secondary instrument. This effectively prevents the potential risk of "average performance meeting standards, but local measurement inaccuracies," ensuring the reliability of the calibration.

[0104] Figure 3 This is a schematic diagram of a calibration device for a secondary instrument of a trace dissolved oxygen meter provided in this application. Figure 3The verification device 50 includes: a first processor 501, a communication bus 502, a memory 503, a communication interface 504, an output device 505, an input device 506, and a second processor 507.

[0105] The calibration device 50 for the secondary instrument of the trace dissolved oxygen meter may include at least one first processor 501 and a memory 503 for storing processor-executable instructions. The first processor 501 is configured to execute the instructions in the memory 503 to implement the calibration method for the secondary instrument of the trace dissolved oxygen meter in the following embodiments.

[0106] In addition, the calibration device 50 for the secondary instrument of the trace dissolved oxygen meter may also include a communication bus 502, at least one communication interface 504, an input device 506, and an output device 505.

[0107] The first processor 501 may be a processor (central processing unit, CPU), a microprocessor unit, an ASIC, or one or more integrated circuits for controlling the execution of programs according to the present application.

[0108] The communication bus 502 may include a path for transmitting information between the aforementioned components.

[0109] Communication interface 504 uses any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.

[0110] Input device 506 is used to receive input signals and output device 505 is used to output signals.

[0111] Memory 503 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed discs, laser discs, optical discs, digital universal discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. Memory may exist independently and be connected to the processing unit via a bus. Memory may also be integrated with the processing unit.

[0112] The memory 503 stores instructions for executing the scheme of this application, and the execution is controlled by the first processor 501. The first processor 501 executes the instructions stored in the memory 503 to realize the functions of the method of this application.

[0113] In a specific implementation, as one example, the first processor 501 may include one or more CPUs, for example... Figure 3 CPU0 and CPU1 in the CPU.

[0114] In a specific implementation, as one example, the calibration device 50 for the secondary instrument of the trace dissolved oxygen meter may include multiple processors, such as... Figure 3 The first processor 501 and the second processor 507 are described. Each of these processors can be a single-core processor or a multi-core processor. A processor here can refer to one or more devices, circuits, and / or processing cores used to process data (such as computer program instructions).

[0115] The calibration equipment for the secondary instrument of the trace dissolved oxygen meter is as follows: Figure 3 The diagram shows a first processor 501 and a memory 503 for storing executable instructions of the first processor 501. The first processor 501 is configured to execute the executable instructions to implement the calibration method for a secondary instrument of a trace dissolved oxygen meter as described in any of the possible embodiments above. Since the same technical effects can be achieved, further details are omitted here to avoid repetition.

[0116] This application also provides a computer-readable storage medium. When the instructions in the computer-readable storage medium are executed by the processor of the calibration device for a trace dissolved oxygen meter secondary instrument, the calibration device for the trace dissolved oxygen meter secondary instrument is able to perform the calibration method for the trace dissolved oxygen meter secondary instrument as described in any of the above possible embodiments. And it can achieve the same technical effect; to avoid repetition, it will not be described again here.

[0117] This application also provides a computer program product, including a computer program or instructions, which are executed by a processor as described in any of the possible embodiments above for calibrating a secondary instrument of a trace dissolved oxygen meter. This achieves the same technical effect, and to avoid repetition, it will not be described again here.

[0118] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0119] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for calibrating a secondary instrument of a micro-dissolved oxygen meter, characterized in that, The method comprises: According to a plurality of measurement indexes of the secondary instrument to be tested, target priorities of a plurality of preset secondary instrument verification modes are determined; the target priorities represent the order of calling each preset secondary instrument verification mode for verification; the plurality of preset secondary instrument verification modes comprise a first whole machine verification mode, a second current corresponding dissolved oxygen relationship verification mode, a third temperature signal verification mode, and a fourth temperature compensation signal verification mode; According to the target priorities, each of the preset secondary instrument verification modes is called to verify each of the measurement indexes of the secondary instrument to be tested, and a verification report is obtained; the plurality of measurement indexes comprise a dissolved oxygen concentration measurement value under a preset whole machine environment, a second current corresponding dissolved oxygen concentration measurement value, a temperature measurement value, and a temperature compensated dissolved oxygen concentration measurement value; one of the preset secondary instrument verification modes corresponds to one of the measurement indexes.

2. The method of claim 1, wherein the method further comprises: According to the target priorities, each of the preset secondary instrument verification modes is called to verify each of the measurement indexes of the secondary instrument to be tested, and a verification report is obtained, which comprises: According to the target priorities, each of the preset secondary instrument verification modes is called to verify each of the measurement indexes of the secondary instrument to be tested, and a verification report is obtained, which comprises: If a target measurement error value of a target measurement accuracy result exceeds a preset error range, it is determined that the verification report indicates that the secondary instrument to be tested has a fault, and the verification is ended; Otherwise, the preset secondary instrument verification mode corresponding to a next level of the calling bit sequence is called to verify the measurement index corresponding to the secondary instrument to be tested, until all of the preset secondary instrument verification modes are traversed, the measurement accuracy results corresponding to the plurality of measurement indexes are obtained, and it is determined that the verification report of the secondary instrument to be tested indicates the measurement accuracy results corresponding to the plurality of measurement indexes.

3. The method of claim 2, wherein the method further comprises: According to the feedback signal condition of the secondary instrument to be tested, the target priorities of the plurality of preset secondary instrument verification modes are determined, which comprises: It is determined that the first whole machine verification mode has the highest priority, and the fourth temperature compensation signal verification mode has the lowest priority; According to the target measurement index of the secondary instrument to be tested, the priority levels of the second current corresponding dissolved oxygen relationship verification mode and the third temperature signal verification mode are determined.

4. The method of claim 2, wherein the method further comprises: The preset secondary instrument verification mode corresponding to the target calling bit sequence is called to verify the target measurement index of the secondary instrument to be tested, which comprises: It is determined that the preset secondary instrument verification mode corresponding to the target calling bit sequence is the first whole machine verification mode; Determine a plurality of first check points according to a measurement range of the dissolved oxygen concentration; each of the first check points corresponds to a different first standard dissolved oxygen concentration value; Under a preset whole machine environment, detect the dissolved oxygen concentration measurement value of the secondary instrument to be measured under a measurement environment corresponding to each of the first check points to obtain a plurality of first dissolved oxygen concentration measurement values; the measurement environment represents that different dissolved oxygen concentration values in water samples are simulated by mixing oxygen mixed gas with different preset concentrations; Determine the difference between the first dissolved oxygen concentration measurement value corresponding to each of the first check points and the first standard dissolved oxygen concentration value to obtain a plurality of first dissolved oxygen concentration errors; and from the plurality of first dissolved oxygen concentration errors, screen out a first target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error to obtain the first measurement accuracy result.

5. The method of claim 2, wherein the method further comprises: The method further comprises: Determine that the preset secondary instrument verification mode corresponding to the target call bit sequence is the second current corresponding dissolved oxygen relationship verification mode; Determine a plurality of second check points according to the linear relationship between the current signal and the dissolved oxygen concentration; the plurality of second check points correspond to a plurality of second current signals capable of uniformly covering the entire dissolved oxygen concentration range; Input the second current signal corresponding to each of the second check points into the secondary instrument to be measured to detect the dissolved oxygen concentration value, to obtain a plurality of second dissolved oxygen concentration measurement values; According to the nonlinear relationship between the current signal and the dissolved oxygen concentration, a target current-dissolved oxygen mapping curve model is established; Input the current signal corresponding to each of the second check points into the target current-dissolved oxygen mapping curve model to obtain a plurality of second standard dissolved oxygen concentration values; Determine the difference between the second dissolved oxygen concentration measurement value corresponding to each of the second check points and the second standard dissolved oxygen concentration value to obtain a plurality of second dissolved oxygen concentration errors; and from the plurality of second dissolved oxygen concentration errors, screen out a second target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error to obtain the second measurement accuracy result.

6. The method of claim 5, wherein the method further comprises: The method further comprises: Pre-set a plurality of dissolved oxygen calibration points; the plurality of dissolved oxygen calibration points represent a plurality of dissolved oxygen concentration values capable of uniformly covering the dissolved oxygen concentration from trace to saturation; Determine a standard current signal corresponding to each of the dissolved oxygen calibration points; Obtain a plurality of point calibration data sets according to a plurality of standard current signals and corresponding dissolved oxygen concentration values; Fit the nonlinear relationship between the current signal and the dissolved oxygen concentration by using a preset algorithm to construct an initial curve model; According to the plurality of point calibration data sets, train the initial curve model to obtain the target current-dissolved oxygen mapping curve model.

7. The method of claim 2, wherein the method further comprises: The method further comprises: Determine that the preset secondary instrument verification mode corresponding to the target call bit sequence is the third temperature signal verification mode; According to the linear relationship between the resistance signal and the temperature, a plurality of third check points are determined; the plurality of third check points represent a plurality of first resistance signals capable of uniformly covering the entire temperature range; the plurality of third check points correspond to a plurality of third standard temperature values respectively; The corresponding first resistance signal of each third check point is input into the temperature value detected by the secondary instrument to be tested to obtain a plurality of third temperature measurement values; The difference between the third temperature measurement value corresponding to different third check points and the third standard temperature value is determined to obtain a plurality of third temperature errors; and from the plurality of third temperature errors, the third target temperature error value with the largest temperature error is screened out to obtain the third measurement accuracy result.

8. The method of claim 2, wherein the method further comprises: The method further comprises: The target call bit sequence corresponds to the fourth temperature compensation signal verification mode; A plurality of fourth check points are determined; each fourth check point corresponds to a different fourth current signal and a second resistance signal; one same fourth current signal matches a plurality of different second resistance signals; According to the correlation between the dissolved oxygen concentration and the temperature, a temperature dynamic compensation model is constructed; The fourth current signal and the second resistance signal corresponding to each fourth check point are input into the temperature dynamic compensation model respectively to obtain a plurality of fourth standard dissolved oxygen concentration values; The fourth current signal and the second resistance signal corresponding to each fourth check point are input into the dissolved oxygen concentration value detected by the secondary instrument to be tested to obtain a plurality of fourth dissolved oxygen concentration measurement values; The difference between the fourth dissolved oxygen concentration measurement value corresponding to different fourth check points and the fourth standard dissolved oxygen concentration value is determined to obtain a plurality of fourth dissolved oxygen concentration errors; and from the plurality of fourth dissolved oxygen concentration errors, the fourth target dissolved oxygen concentration error value with the largest dissolved oxygen concentration error is screened out to obtain the fourth measurement accuracy result.

9. A calibration system for a secondary instrument for a micro-dissolved oxygen meter, characterized by, The system comprises: The whole machine verification module is configured to verify the dissolved oxygen concentration measurement accuracy of the secondary instrument to be tested in a preset whole machine environment according to a first whole machine verification mode to obtain a first measurement accuracy result; The current corresponding dissolved oxygen relationship verification module is configured to verify the dissolved oxygen concentration measurement accuracy of the secondary instrument to be tested according to a second current corresponding dissolved oxygen relationship verification mode to obtain a second measurement accuracy result; The temperature signal verification module is configured to verify the temperature measurement accuracy of the secondary instrument to be tested according to a third temperature signal verification mode to obtain a third measurement accuracy result; The temperature compensation signal verification module is configured to verify the dissolved oxygen concentration measurement accuracy of the secondary instrument to be tested after temperature compensation according to a fourth temperature compensation signal verification mode to obtain a fourth measurement accuracy result; The control and data processing module is configured to determine the target priority of a plurality of preset secondary instrument verification modes according to a plurality of measurement indexes of the secondary instrument to be tested; and according to the target priority, each preset secondary instrument verification mode is called to verify each measurement index of the secondary instrument to be tested to obtain a verification report; A method of calibrating a microdissolved oxygen meter secondary instrument configured to perform any of the methods of claims 1-8.

10. A computer-readable storage medium having stored thereon instructions, the computer-readable storage medium comprising: The instructions in the computer-readable storage medium, when executed by a processor of an electronic device, enable the electronic device to perform the method of calibrating a microdissolved oxygen meter secondary instrument as claimed in any of claims 1-8.

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