A method and apparatus for correcting the flow rate setpoint error of an ion chromatograph, and a computer-readable storage medium.

Abstract

This invention relates to the field of ion chromatography technology and provides a method for correcting the flow rate setpoint error of an ion chromatograph. Based on the theoretical flow rate of the mobile phase and the actual rotational speed of the motor, the actual flow rate of the mobile phase and the actual rotational speed of the motor are calculated and verified. Finally, the compressibility coefficient under a certain pressure multiplier condition is calculated, and the actual rotational speed of the motor is adjusted according to the compressibility coefficient so that the instantaneous flow rate of the mobile phase at the outlet equals the set theoretical flow rate, thus completing the correction of the ion chromatograph flow rate setpoint error. This not only ensures the stability of sample separation in the ion chromatograph but also improves the accuracy of the detection results. This application also discloses a device for correcting the flow rate setpoint error of an ion chromatograph and a computer-readable storage medium.

Description

Technical Field

[0001] This invention belongs to the field of ion chromatography technology, and particularly relates to a method and apparatus for correcting the error of the flow rate setpoint of an ion chromatograph, as well as a computer-readable storage medium. Background Technology

[0002] Currently, ion chromatography is mainly used to analyze anions and cations in aqueous solutions. Ion separation is achieved through reversible exchange between dissociable ions on ion exchange resins and solute ions with the same charge in the mobile phase, as well as by analyzing the difference in affinity of the solute for the exchanger. During ion chromatography, the flow rate of the mobile phase is a critical factor. Typically, a theoretical flow rate is set before detection. However, if the flow rate changes during detection, an error will occur between the actual and theoretical flow rates. A large error indicates extreme flow rate instability, which can alter the retention times of components in the sample, potentially leading to incomplete separation or peak overlap, affecting peak area and height measurements, and impacting accurate analysis of sample components. Furthermore, sudden changes in flow rate during detection may loosen or damage the stationary phase, affecting the lifespan of the chromatographic column.

[0003] To solve the above-mentioned technical problems, this invention provides a method and apparatus for correcting the error of the flow rate setting value of an ion chromatograph, as well as a computer-readable storage medium. Summary of the Invention

[0004] This invention provides a method and apparatus for correcting the error of the flow rate setpoint of an ion chromatograph, as well as a computer-readable storage medium, aiming to solve the problem of large errors in the flow rate setpoint of an ion chromatograph.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a method for correcting the flow rate setpoint error of an ion chromatograph, wherein the ion chromatograph includes a high-pressure cam pump, the high-pressure cam pump includes a motor, and the method for correcting the flow rate setpoint error of the ion chromatograph includes the following steps: S1, set the theoretical flow rate of the mobile phase in the ion chromatograph to be... Calculate the theoretical speed of the motor ; S2, at theoretical speed Run the motor and set the pressure multiplier of the high-pressure cam pump to the i-th pressure multiplier. p i After running for a period of time until the ion chromatograph reaches steady state, the first actual flow rate of the mobile phase is measured by a balance. ; S3, based on the first actual flow velocity of the mobile phase Calculate the first actual speed of the motor The calculation formula is as follows:

[0006] S4, the first actual speed of the motor Perform verification at the same voltage multiplier. p i After restarting the ion chromatograph until it reaches steady state, the second actual flow rate of the mobile phase was measured using a balance. ; S5, based on the second actual flow velocity of the mobile phase and the first actual speed Calculate the second actual speed of the motor The calculation formula is as follows:

[0007] S6, Determine Is it equal to ,exist If the verification is successful, calculate the compression coefficient of the motor speed.

[0008] exist In the case of nth actual flow rate, repeat steps S4 and S5. equal When the verification is successful, calculate the nth actual speed of the motor. The calculation formula is as follows:

[0009] S7, Calculate the compression coefficient for motor speed. The calculation formula is as follows:

[0010] S8, based on the compression coefficient Adjust the actual speed of the motor so that the instantaneous flow velocity of the mobile phase at the outlet is equal to the set theoretical flow velocity.

[0011] Based on the above technical solution, the high-pressure cam pump further includes a cam, and in step S1, the theoretical speed of the motor... The calculation formula is as follows:

[0012] In the above formula, 2.5 is the transmission ratio between the cam and the motor, 200 is the number of steps in one revolution of the motor, and 60 is the unit converted to seconds. The volume of liquid discharged from the ion chromatograph per cycle of the cam operation.

[0013] Based on the above technical solution, in step S2, 0≤p i ≤20, p i -p i-1 =0.1MPa.

[0014] Based on the above technical solution, step S2 includes the following steps: A1, based on theoretical rotational speed Run the motor and set the pressure multiplier of the high-pressure cam pump to the i-th pressure multiplier. p i Run the instrument for a period of time until the ion chromatograph reaches a steady state; A2, using multiple measurements of the outflowing mobile phase mass m over time t using a balance as a set of data, calculate multiple actual flow velocities. F for

[0015] In the above formula, The density of the mobile phase at the experimental temperature; A3, based on multiple actual flow rates in a set of data F Calculate the setpoint error and traffic stability The calculation formula is as follows:

[0016]

[0017] In the above formula, This represents the arithmetic mean of multiple actual flow velocities F within the same data set. This represents the maximum value of multiple actual flow velocities F within the same set of data. It represents the minimum value of multiple actual flow velocities F in the same set of data; A4, in the set value error and traffic stability If all of them are located within the target interval, determine The first actual flow velocity F 1.

[0018] Based on the above technical solution, in step A4, the set value error The target range is -1.5% to 1.5%, and the flow stability is... The target range is 0 to 0.5%.

[0019] Based on the above technical solution, in steps S2 and S4, the time to reach steady state is 20 min to 30 min.

[0020] Based on the above technical solution, in step S8, according to the compression coefficient... Adjust the actual motor speed; adjust the actual motor speed to...

[0021] In the above formula, For system constants, This is the calibration coefficient.

[0022] Based on the above technical solution, in step S8, the error range between the instantaneous flow velocity of the mobile phase at the outlet and the set theoretical flow velocity is 0~0.17%.

[0023] In a second aspect, the present invention provides an apparatus for correcting the flow rate setpoint error of an ion chromatograph, comprising a processor and a memory storing program instructions, the processor being configured to execute, when running the program instructions, a method for correcting the flow rate setpoint error of an ion chromatograph as described in any of the above embodiments.

[0024] Thirdly, the present invention provides a computer-readable storage medium storing program instructions that, when executed, cause a computer to perform a method for correcting the flow rate setpoint error of an ion chromatograph as described in any of the above embodiments.

[0025] Compared with related technologies, the beneficial effects of the present invention are as follows: This invention calculates the theoretical speed of the motor based on the theoretical flow rate of the ion chromatograph. While the motor is running at its theoretical speed, the first actual flow rate of the ion chromatograph is measured under a certain pressure multiplication condition with a high-pressure cam pump. The first actual speed of the motor is then calculated based on this first actual flow rate. After calculation, a verification process is required. The actual flow rate is measured again under the same pressure multiplication condition, and it is observed whether the actual flow rate is equal to the theoretical flow rate. If they are equal, the verification is complete. If they are not equal, the measurement is repeated until the measured actual flow rate equals the theoretical flow rate. The actual speed of the motor is then calculated, and the compression coefficient is calculated based on the actual speed. The motor speed is controlled according to the compression coefficient, ensuring that the instantaneous flow rate of the ion chromatograph equals the set theoretical flow rate, reducing the error in the set value and improving flow rate stability.

[0026] In this way, the retention time and separation degree of each component in the sample within the chromatographic column become relatively stable, ensuring the stability of the separation effect. During ion chromatography detection, constant flow mode ensures relatively stable residence time and concentration changes of compounds in the detector, resulting in more accurate measurements of peak area and peak height. Furthermore, the mobile phase passes through the column with uniform force and speed, reducing impact and wear on the stationary phase within the column, helping to maintain normal column function, extend its lifespan, and reduce operating costs. Simultaneously, constant flow mode ensures that the mobile phase flow rate is consistent in each experiment, making experimental conditions more uniform and improving the comparability and reliability of experimental results. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0028] Figure 1 This is a flowchart of the method for correcting the flow rate setpoint error of an ion chromatograph provided by the present invention; Figure 2 This is a three-dimensional curve of fitting the compressibility coefficient with different pressure multipliers and theoretical flow rates provided by the present invention; Figure 3 This is a schematic diagram of the device for correcting the flow rate setting error of an ion chromatograph provided by the present invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and examples: Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Combination Figure 1 As shown in the figure, this disclosure provides a method for correcting the flow rate setpoint error of an ion chromatograph. The ion chromatograph includes a high-pressure cam pump, which includes a motor. The method for correcting the flow rate setpoint error of the ion chromatograph includes the following steps: S1, set the theoretical flow rate of the mobile phase in the ion chromatograph to be... Calculate the theoretical speed of the motor ; S2, at theoretical speed Run the motor and set the pressure multiplier of the high-pressure cam pump to the i-th pressure multiplier. p i After running for a period of time until the ion chromatograph reaches steady state, the first actual flow rate of the mobile phase is measured by a balance. ; S3, based on the first actual flow velocity of the mobile phase Calculate the first actual speed of the motor The calculation formula is as follows:

[0033] S4, the first actual speed of the motor Perform verification at the same voltage multiplier. p i After restarting the ion chromatograph until it reaches steady state, the second actual flow rate of the mobile phase was measured using a balance. ; S5, based on the second actual flow velocity of the mobile phase and the first actual speed Calculate the second actual speed of the motor The calculation formula is as follows:

[0034] S6, Determine Is it equal to ,exist If the verification is successful, calculate the compression coefficient of the motor speed.

[0035] exist In the case of nth actual flow rate, repeat steps S4 and S5. equal When the verification is successful, calculate the nth actual speed of the motor. The calculation formula is as follows:

[0036] S7, Calculate the compression coefficient for motor speed. The calculation formula is as follows:

[0037] S8, based on the compression coefficient Adjust the actual speed of the motor so that the instantaneous flow velocity of the mobile phase at the outlet is equal to the set theoretical flow velocity.

[0038] The method for correcting the flow rate setpoint error of an ion chromatograph provided in this embodiment calculates the theoretical speed of the motor based on the theoretical flow rate of the ion chromatograph. While the motor is running at the theoretical speed, the first actual flow rate of the ion chromatograph is measured under a certain pressure multiplication condition with the high-pressure cam pump. The first actual speed of the motor is then calculated based on this first actual flow rate. After calculation, a verification process is required. The actual flow rate is measured again under the same pressure multiplication condition, and it is observed whether the actual flow rate is equal to the theoretical flow rate. If they are equal, the verification is complete. If they are not equal, the measurement is repeated until the measured actual flow rate is equal to the theoretical flow rate. The actual speed of the motor is then calculated, and the compression coefficient is calculated based on the actual speed. The motor speed is controlled according to the compression coefficient, ensuring that the instantaneous flow rate of the ion chromatograph equals the set theoretical flow rate, thereby reducing the setpoint error and improving flow rate stability.

[0039] In this way, the retention time and separation degree of each component in the sample within the chromatographic column become relatively stable, ensuring the stability of the separation effect. During ion chromatography detection, constant flow mode ensures relatively stable residence time and concentration changes of compounds in the detector, resulting in more accurate measurements of peak area and peak height. Furthermore, the mobile phase passes through the column with uniform force and speed, reducing impact and wear on the stationary phase within the column, helping to maintain normal column function, extend its lifespan, and reduce operating costs. Simultaneously, constant flow mode ensures that the mobile phase flow rate is consistent in each experiment, making experimental conditions more uniform and improving the comparability and reliability of experimental results.

[0040] Based on the above technical solution, the high-pressure cam pump further includes a cam, and in step S1, the theoretical speed of the motor... The calculation formula is as follows:

[0041] In the above formula, 2.5 is the transmission ratio between the cam and the motor, 200 is the number of steps in one revolution of the motor, and 60 is the unit converted to seconds. The volume of liquid discharged from the ion chromatograph per cycle of the cam operation.

[0042] Based on the above technical solution, in step S2, 0≤ p i ≤20, p i -p i-1 =0.1MPa.

[0043] In this embodiment, the pressure multiplier of the high-pressure cam pump is set at an interval of 0.1 MPa. It can be understood that the pressure multiplier interval can also be 0.2 MPa, 0.05 MPa, 0.02 MPa or 0.01 MPa. This application does not limit the pressure multiplier interval, as long as the set value error can meet the actual use requirements of the pump.

[0044] Based on the above technical solution, step S2 includes the following steps: A1, based on theoretical rotational speed Run the motor and set the pressure multiplier of the high-pressure cam pump to the i-th pressure multiplier. p i Run the instrument for a period of time until the ion chromatograph reaches a steady state; A2, using multiple measurements of the outflowing mobile phase mass m over time t using a balance as a set of data, calculate multiple actual flow velocities. F for

[0045] In the above formula, The density of the mobile phase at the experimental temperature; A3, based on multiple actual flow rates in a set of data F Calculate the setpoint error and traffic stability The calculation formula is as follows:

[0046]

[0047] In the above formula, This represents the arithmetic mean of multiple actual flow velocities F within the same data set. This represents the maximum value of multiple actual flow velocities F within the same set of data. It represents the minimum value of multiple actual flow velocities F in the same set of data; A4, in the set value error and traffic stability If all of them are located within the target interval, determine The first actual flow velocity F 1.

[0048] Based on the above technical solution, in step A4, the set value error The target range is -1.5% to 1.5%, and the flow stability is... The target range is 0 to 0.5%.

[0049] According to the set value error and traffic stability Two parameters determine the required test data to determine the first actual flow rate, when the set value error... Between -1.5% and 1.5%, and with stable flow. When the percentage is between 0% and 0.5%, it indicates that the test data set meets the requirements. At this point, the arithmetic mean of multiple actual flow velocities F in this data set is taken as the first actual flow velocity. F 1. If it is a set value error Not between -1.5% and 1.5%, or with stable traffic. If the flow rate is not between 0% and 0.5%, it indicates that this set of test data does not meet the requirements. This set of data should be discarded, and the next set of data should be tested to determine the first actual flow rate. F 1.

[0050] Based on the above technical solution, in steps S2 and S4, the time to reach steady state is 20 min to 30 min.

[0051] Based on the above technical solution, in step S8, according to the compression coefficient... Adjust the actual motor speed; adjust the actual motor speed to...

[0052] In the above formula, For system constants, This is the calibration coefficient.

[0053] Specifically, system constants a It only relates to the entire ion chromatography system and depends on three factors: the cam-motor transmission ratio, the discharge volume during the cam's operating cycle, and the motor's microstepping. Calibration coefficient b The value depends solely on the mechanical parameters of the high-pressure cam pump itself, such as installation parameters and the interaction parameters between mechanical components; these values ​​are typically between 0.9 and 1.1. The compression coefficient... Different voltage multipliers p i Under different theoretical flow rates and conditions Under different conditions, according to steps S1~S7 above, we obtain three-dimensional fitting curves of different pressure multiplication factors and theoretical flow velocities versus compressibility coefficients, as shown below. Figure 2 As shown, the theoretical flow rate set in this embodiment is between 0.5 and 2 mL / min. This range is the commonly used flow rate range of the mobile phase in the detection process of ion chromatograph. The compressibility coefficient can also be measured in other ranges in the same way, which will not be described in detail here.

[0054] Based on the above technical solution, in step S8, the error range between the instantaneous flow velocity of the mobile phase at the outlet and the set theoretical flow velocity is 0~0.17%.

[0055] Combination Figure 3 As shown, this disclosure provides an apparatus for correcting the flow rate setpoint error of an ion chromatograph, including a processor and a memory storing program instructions. Optionally, the apparatus may further include a communication interface and a bus. The processor, communication interface, and memory can communicate with each other via the bus, and the communication interface can be used for information transmission. The processor is configured to execute the method for correcting the flow rate setpoint error of an ion chromatograph as described in any of the above embodiments when running the program instructions.

[0056] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0057] Memory, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor executes the program instructions / modules stored in the memory to perform functional applications and data processing, that is, to implement the method for correcting the flow rate setpoint error of the ion chromatograph described in the above embodiments.

[0058] The memory may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory may include high-speed random access memory and may also include non-volatile memory.

[0059] This disclosure provides a computer-readable storage medium storing program instructions that, when executed, cause a computer to perform a method for correcting the flow rate setpoint error of an ion chromatograph as described in any of the above embodiments.

[0060] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as a USB flash drive, external hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk, etc., and other media capable of storing program code.

[0061] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0062] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0063] The methods and products disclosed in the embodiments herein (including but not limited to devices and equipment) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0064] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0065] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for correcting the error of the flow rate setpoint of an ion chromatograph, characterized in that, The ion chromatograph includes a high-pressure cam pump, which includes a motor. The method for correcting the flow rate setpoint error of the ion chromatograph includes the following steps: S1, set the theoretical flow rate of the mobile phase in the ion chromatograph to be... Calculate the theoretical speed of the motor ; S2, at theoretical speed Run the motor and set the pressure multiplier of the high-pressure cam pump to the i-th pressure multiplier. p i After running for a period of time until the ion chromatograph reaches steady state, the first actual flow rate of the mobile phase is measured by a balance. ; S3, based on the first actual flow velocity of the mobile phase Calculate the first actual speed of the motor The calculation formula is as follows: S4, the first actual speed of the motor Perform verification at the same voltage multiplier. p i After restarting the ion chromatograph until it reaches steady state, the second actual flow rate of the mobile phase was measured using a balance. ; S5, based on the second actual flow velocity of the mobile phase and the first actual speed Calculate the second actual speed of the motor The calculation formula is as follows: S6, Determine Is it equal to ,exist If the verification is successful, calculate the compression coefficient of the motor speed. exist In the case of nth actual flow rate, repeat steps S4 and S5. equal When the verification is successful, calculate the nth actual speed of the motor. The calculation formula is as follows: S7, Calculate the compression coefficient for motor speed. The calculation formula is as follows: S8, based on the compression coefficient Adjust the actual speed of the motor so that the instantaneous flow velocity of the mobile phase at the outlet is equal to the set theoretical flow velocity.

2. The method for correcting the flow rate setpoint error of an ion chromatograph according to claim 1, characterized in that, The high-pressure cam pump also includes a cam, and in step S1, the theoretical speed of the motor is... The calculation formula is as follows: In the above formula, 2.5 is the transmission ratio between the cam and the motor, 200 is the number of steps in one revolution of the motor, and 60 is the unit converted to seconds. The volume of liquid discharged from the ion chromatograph per cycle of the cam operation.

3. The method for correcting the flow rate setpoint error of an ion chromatograph according to claim 1, characterized in that, In step S2, 0≤ p i ≤20, p i -p i-1 =0.1MPa.

4. The method for correcting the flow rate setpoint error of an ion chromatograph according to claim 1, characterized in that, Step S2 includes the following steps: A1, based on theoretical rotational speed Run the motor and set the pressure multiplier of the high-pressure cam pump to the i-th pressure multiplier. p i Run the instrument for a period of time until the ion chromatograph reaches a steady state; A2, using multiple measurements of the outflowing mobile phase mass m over time t using a balance as a set of data, calculate multiple actual flow velocities. F for In the above formula, The density of the mobile phase at the experimental temperature; A3, based on multiple actual flow rates in a set of data F Calculate the setpoint error and traffic stability The calculation formula is as follows: In the above formula, This represents the arithmetic mean of multiple actual flow velocities F within the same data set. This represents the maximum value of multiple actual flow velocities F within the same set of data. It represents the minimum value of multiple actual flow velocities F in the same set of data; A4, in the set value error and traffic stability If all of them are located within the target interval, determine The first actual flow velocity F 1.

5. The method for correcting the flow rate setpoint error of an ion chromatograph according to claim 4, characterized in that, In step A4, the set value error The target range is -1.5% to 1.5%, and the flow stability is... The target range is 0 to 0.5%.

6. The method for correcting the flow rate setpoint error of an ion chromatograph according to claim 1, characterized in that, In steps S2 and S4, the time to reach steady state is 20 min to 30 min.

7. The method for correcting the flow rate setpoint error of an ion chromatograph according to claim 1, characterized in that, In step S8, based on the compression coefficient Adjust the actual motor speed; adjust the actual motor speed to... In the above formula, For system constants, This is the calibration coefficient.

8. The method for correcting the flow rate setpoint error of an ion chromatograph according to claim 1, characterized in that, In step S8, the error range between the instantaneous flow velocity of the mobile phase at the outlet and the set theoretical flow velocity is 0~0.17%.

9. A device for correcting the flow rate setpoint error of an ion chromatograph, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when running the program instructions, execute the method for correcting the error of the ion chromatograph flow rate setpoint as described in any one of claims 1 to 8.

10. A computer-readable storage medium storing program instructions, characterized in that, When the program instructions are executed, they cause the computer to perform the method for correcting the flow rate setpoint error of the ion chromatograph as described in any one of claims 1 to 8.

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