Offline Calibration Method and System for Nuclear Power Plant Transmitters

Abstract

This invention discloses an offline calibration method and system for nuclear power plant transmitters, applicable to nuclear-grade pressure transmitters. The nuclear-grade pressure transmitter includes a sensor and a processing card. The method includes: S10, generating a flow control signal to control the signal flow between the sensor and the processing card during calibration, and a pressure control signal to control the magnitude of the test pressure input to the sensor during calibration; S20, during calibration, acquiring the measurement signal output by the processing card, and calibrating the tested nuclear-grade pressure transmitter based on the measurement signal and the calibration items. Implementing this invention allows personnel to perform offline calibration of nuclear-grade pressure transmitters in well-equipped and well-conditioned environments, improving calibration efficiency and reducing labor costs, calibration complexity, and radiation dose. It also facilitates performance testing of nuclear-grade pressure transmitters not installed on-site.

Description

Technical Field

[0001] This invention relates to the field of nuclear-grade pressure transmitter technology, and in particular to an offline calibration method and system for nuclear power plant transmitters. Background Technology

[0002] In nuclear power plants, nuclear-grade pressure transmitters are mainly used to measure important parameters such as liquid level, pressure, and flow rate. They form the basis for the control and monitoring of critical process systems in nuclear power plants. Among them, the Rolls-Royce 6000 series transmitters from France are widely used. The structure of the 6000 series transmitters differs from other ordinary transmitters. It includes separately installed sensors and processing cards. The sensors are located in the nuclear island, while the processing cards are located in the electrical building.

[0003] Currently, because the 6000 series transmitters have separate sensor and processing card installations, they can only be calibrated after installation in the field. This results in the sensor's performance being uncertain before it is applied to the field system, and the performance of the processing card cannot be determined or adjusted. Furthermore, it is impossible to burn-in the transmitter to determine its performance. On-site calibration requires different personnel to simultaneously apply pressure to the sensor and measure and adjust the card's electrical parameters, leading to communication difficulties, low calibration efficiency, and high labor costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an offline calibration method and system for nuclear power plant transmitters.

[0005] The technical solution adopted by this invention to solve its technical problem is: to construct an offline calibration method for nuclear power plant transmitters, applicable to nuclear-grade pressure transmitters, wherein the nuclear-grade pressure transmitter includes a sensor and a processing card, and the method includes the following steps:

[0006] S10. Generate a flow control signal for controlling the signal flow between the sensor and the processing card during verification, and a pressure control signal for controlling the magnitude of the test pressure input to the sensor during verification, based on the verification items.

[0007] S20. During calibration, the measurement signal output by the processing card is acquired, and the nuclear pressure transmitter under test is calibrated according to the measurement signal and calibration items.

[0008] Preferably, the verification items include at least one of potentiometer calibration, linearity testing, and card verification.

[0009] Preferably, S10 includes: if the calibration item is the potentiometer calibration, generating a first flow control signal for controlling the interaction between the sensor and the processing card, and generating a first pressure control signal according to the set calibration requirements; wherein the potentiometer calibration includes zero-point calibration and range point calibration;

[0010] In step S20, the step of verifying the tested nuclear-grade pressure transmitter according to the measurement signal and verification items includes: adjusting the position of the calibration potentiometer in the processing card so that the tested nuclear-grade pressure transmitter meets the zero point and range point requirements; wherein, the calibration potentiometer includes a zero point potentiometer and a range point potentiometer.

[0011] Preferably, step S20 further includes: after the tested nuclear-grade pressure transmitter has passed verification, acquiring and recording the AC signal output by the sensor of the tested nuclear-grade pressure transmitter at the set test point, and using it as the historical AC signal of the corresponding sensor;

[0012] S10 further includes: if the verification item is the card verification, generating a second flow control signal for controlling the sensor and the processing card to disconnect from interaction;

[0013] In S20, the step of verifying the tested nuclear pressure transmitter according to the measurement signal and verification items further includes: acquiring the historical AC signal of the sensor of the processing card to be replaced, and inputting an analog AC signal simulating the historical AC signal into the processing card, and then adjusting the position of the calibration potentiometer in the processing card to make the processing card meet the replacement requirements of the processing card to be replaced.

[0014] Preferably, S20 further includes:

[0015] If the tested nuclear-grade pressure transmitter cannot meet the relevant requirements by adjusting the position of the calibration potentiometer, then the tested nuclear-grade pressure transmitter is determined to be non-compliant.

[0016] Preferably, S10 further includes: if the verification item is the linear test, generating a first flow control signal for controlling the interaction between the sensor and the processing card, and sequentially generating corresponding second pressure control signals according to a preset test point list; wherein, the preset test point list includes a plurality of test pressure values ​​and a measurement reference value corresponding to each of the test pressure values; each of the test pressure values ​​is used to set the value of the second pressure control signal;

[0017] In S20, the step of verifying the tested nuclear-grade pressure transmitter according to the measurement signal and the verification item further includes: comparing the measurement signal obtained after each output of the second pressure control signal with the corresponding measurement reference value to determine whether the tested nuclear-grade pressure transmitter meets the linearity requirement.

[0018] Preferably, in S10, the method further includes:

[0019] The signal flow between the sensor and the processing card is controlled by a preset signal management unit, the test pressure is input to the sensor by a pressure supply unit, and the measurement signal output by the processing card is acquired by a signal measurement unit.

[0020] This invention also constructs an offline calibration system for nuclear power plant transmitters, applicable to nuclear-grade pressure transmitters, wherein the nuclear-grade pressure transmitter includes a sensor and a processing card. The system includes:

[0021] The pressure application unit is used to input the test pressure to the sensor according to the pressure application control signal during calibration;

[0022] A signal measurement unit is used to acquire the measurement signals output by the processing card;

[0023] The signal management unit is used to control the signal flow direction between the sensor and the processing card according to the flow direction control signal during verification; and

[0024] The main control unit is used to generate the pressure control signal and flow control signal according to the calibration items. During calibration, it also calibrates the nuclear pressure transmitter under test according to the acquired measurement signals and calibration items.

[0025] Preferably, the signal measurement unit is further configured to acquire the AC signal output by the sensor;

[0026] The nuclear power plant transmitter offline calibration system also includes a signal simulation unit and a database;

[0027] The signal simulation unit is connected to the signal management unit and is used to simulate the output signal of the sensor;

[0028] The database is used to store the AC signals collected when the sensor was previously verified to be qualified;

[0029] The main control unit also obtains the historical AC signals of the sensors of the card to be replaced through the database, and controls the signal simulation unit to output analog AC signals to the sensors of the card to be replaced according to the historical AC signals, so as to perform card verification.

[0030] Preferably, the signal management unit includes: a sensor interface, a switch, a card interface, a measurement unit interface, and an analog unit interface;

[0031] The first, second, and third ends of the sensor interface are connected in sequence to the first excitation signal input end, the AC signal output end, and the second excitation signal input end of the sensor. The second end of the sensor interface is also connected to the input end of the switch. The output end of the switch is connected to the second end of the card interface. The first and third ends of the sensor interface are also connected to the first and third ends of the card interface.

[0032] The control terminal of the switching switch is connected to the main control unit to control the switching on and off according to the flow direction control signal;

[0033] The first, second, third, fourth, and fifth ends of the card interface are sequentially connected to the first excitation signal output end, the AC signal input end, the second excitation signal output end, the first measurement signal output end, and the second measurement signal output end of the processing card. The second, fourth, and fifth ends of the card interface are also connected to the first, third, and fourth ends of the measurement unit interface.

[0034] The first and second ends of the measurement unit interface are connected to the first measurement port of the signal measurement unit, the second end of the measurement unit interface is grounded, and the third and fourth ends of the measurement unit interface are connected to the second measurement port of the signal measurement unit.

[0035] The first end of the analog unit interface is connected to the second end of the card interface, the second end of the analog unit interface is grounded, and the first and second ends of the analog unit interface are also connected to the signal analog unit.

[0036] Implementing the technical solution of this invention allows for the generation of a flow control signal to control the signal flow between the sensor and the processing card during calibration, and a pressure control signal to control the magnitude of the test pressure input to the sensor during calibration, thus preparing for the corresponding calibration items. During calibration, the nuclear-grade pressure transmitter under test is calibrated based on the calibration items and the measurement signals output by the processing card. Implementing this invention enables personnel to perform offline calibration of nuclear-grade pressure transmitters in well-equipped and well-calibrated locations, eliminating the need for remote communication. This positively impacts calibration efficiency, reduces labor costs, calibration complexity, and radiation dose. It also facilitates performance testing of nuclear-grade pressure transmitters not installed on-site, ensuring that the transmitter meets application requirements when installed on-site. Attached Figure Description

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0038] Figure 1 This is a flowchart illustrating the offline calibration method for nuclear power plant transmitters in some embodiments of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of an offline calibration system for nuclear power plant transmitters in some embodiments of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the signal management unit in some embodiments of the present invention. Detailed Implementation

[0041] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0042] It should be noted that the flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0043] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0044] refer to Figure 1 This is a flowchart illustrating an offline calibration method for nuclear power plant transmitters in some embodiments of the present invention. This offline calibration method is used to perform offline calibration of nuclear-grade pressure transmitters not installed in industrial sites. The nuclear-grade pressure transmitter includes a sensor and a processing card. The method includes the following steps:

[0045] S10. Generate a flow control signal for controlling the signal flow between the sensor and the processing card during calibration, and a pressure control signal for controlling the magnitude of the test pressure input to the sensor during calibration, based on the calibration items.

[0046] S20. During calibration, acquire the measurement signal output by the processing card, and calibrate the tested nuclear pressure transmitter according to the measurement signal and calibration items.

[0047] In this embodiment, a flow control signal is generated based on the calibration items to control the signal flow between the sensor and the processing card during calibration, and a pressure control signal is generated to control the magnitude of the test pressure input to the sensor during calibration, in preparation for the corresponding calibration items. During calibration, the nuclear-grade pressure transmitter under test is calibrated based on the calibration items and the measurement signals output by the processing card. Implementing this invention allows personnel to perform offline calibration of nuclear-grade pressure transmitters in a well-equipped and well-calibrated environment, eliminating the need for remote communication. This positively impacts calibration efficiency, reduces labor costs, calibration complexity, and radiation dose. It also facilitates performance testing of nuclear-grade pressure transmitters not installed on-site, ensuring that the transmitter meets application requirements when installed on-site.

[0048] In one optional embodiment, the calibration items include at least one of potentiometer calibration, linearity testing, and card calibration. Potentiometer calibration includes zero-point calibration and range point calibration.

[0049] The purpose of zero-point calibration is to ensure that when the test pressure input to the sensor is zero, the measurement signal output by the processing card is also characterized as the minimum value of the range.

[0050] The purpose of range calibration is to ensure that when the test pressure input to the sensor is the upper limit of the measurable value, the measurement signal output by the processing card is also characterized as the maximum value of the range.

[0051] The purpose of linearity testing is to verify whether the test pressure and measurement signal of a nuclear-grade pressure transmitter meet the linearity requirements.

[0052] The purpose of card calibration is to verify whether a processing card, when used with a sensor already installed in the field, meets application requirements. When a processing card in a nuclear-grade pressure transmitter fails, but its sensor is functioning normally, a new processing card is calibrated to confirm that it meets application requirements when used with the sensor of the nuclear-grade pressure transmitter. This allows the processing card to be replaced in the nuclear-grade pressure transmitter without requiring further online calibration, significantly improving maintenance efficiency.

[0053] In some embodiments, step S10 further includes: controlling the signal flow between the sensor and the processing card through a preset signal management unit, inputting the test pressure to the sensor through a preset pressure supply unit, and acquiring the measurement signal output by the processing card through a signal measurement unit.

[0054] Specifically, the signal management unit controls the connection / disconnection of the line between the AC signal output terminal of the sensor and the AC signal input terminal of the processing card based on the flow control signal, thereby controlling whether the processing card receives the AC signal output by the sensor. The pressure application unit is used to input pressure to the sensor under test and controls the magnitude of the pressure according to the pressure application control signal; it is easy to understand that the pressure application unit can be a hydraulic pressure application device commonly used in the prior art. The signal measurement unit can be a current and voltage acquisition device commonly used in the prior art.

[0055] In an optional embodiment, step S10 includes: if the calibration item is potentiometer calibration, generating a first flow control signal for controlling the interaction between the sensor and the processing card, and generating a first pressure control signal according to the set calibration requirements;

[0056] In step S20, verifying the tested nuclear-grade pressure transmitter according to the measurement signal and calibration items includes: adjusting the position of the calibration potentiometer in the processing card to make the tested nuclear-grade pressure transmitter meet the zero point and range point requirements; wherein, the calibration potentiometer includes a zero point potentiometer and a range point potentiometer.

[0057] In this embodiment, a first flow control signal is first generated (input to the signal management unit) to close the switch controlling the AC signal output of the sensor and the AC signal input of the processing card within the signal management unit. Then, zero-point calibration and range calibration are performed sequentially. Taking the commonly used 6000 series transmitter as an example, the zero-point calibration process is as follows: First, a zero-point pressure signal is generated (input to the pressure supply unit) to input the zero-point test pressure (0) to the sensor. Then, the measurement signal output by the processing card is acquired and displayed. The operator can then adjust the position of the zero-point potentiometer to ensure the measurement signal value meets the zero-point and range requirements (the measurement signal is displayed as 4mA). The range calibration process is as follows: First, a range-point pressure signal is generated (input to the pressure supply unit) to input the range-point test pressure (the transmitter's maximum measurement pressure) to the sensor. Then, the measurement signal output by the processing card is acquired and displayed. The operator can then adjust the position of the range-point potentiometer to ensure the measurement signal value meets the zero-point and range requirements (the measurement signal is displayed as 20mA).

[0058] In an optional embodiment, step S20 further includes: after the tested nuclear-grade pressure transmitter passes verification, acquiring and recording the AC signal output by the sensor of the tested nuclear-grade pressure transmitter at the set test point, and using it as the historical AC signal of the corresponding sensor. The set test point can be acquired by the signal processing unit, specifically including the zero-point AC signal and the range-point AC signal output by the sensor during zero-point calibration and range-point calibration, respectively, as well as several AC signal values ​​output by the sensor at each test pressure value during linear testing (corresponding one-to-one with each test pressure value). Recording the set test point is for preparation for card verification. Additionally, a database can be established to store the historical AC signals of each sensor.

[0059] In one specific embodiment, step S10 further includes: if the verification item is card verification, generating a second flow control signal for controlling the sensor and processing the card disconnection interaction;

[0060] In S20, verifying the tested nuclear-grade pressure transmitter based on the measurement signal and calibration items also includes: acquiring the historical AC signal of the sensor of the processing card to be replaced, inputting an analog AC signal simulating the historical AC signal into the processing card, and then adjusting the position of the calibration potentiometer in the processing card to make the processing card meet the replacement requirements of the processing card to be replaced.

[0061] In this embodiment, a second flow control signal is first generated (input to the signal management unit) to disconnect the switch controlling the AC signal output of the sensor and the AC signal input of the processing card within the signal management unit, thus preventing the AC signal input of the processing card from being affected by external devices. Then, the analog AC signals of the corresponding sensors are acquired and sequentially input to the processing card. Subsequently, potentiometer calibration and linearity testing are performed on the processing card. If the measurement signals output by the processing card are within the error range of the measurement signals output during the corresponding verification items before the processing card to be replaced malfunctions, then the processing card is determined to meet the replacement requirements of the processing card to be replaced.

[0062] In an optional embodiment, step S20 further includes: if the tested nuclear-grade pressure transmitter cannot meet the relevant requirements by adjusting the position of the calibration potentiometer, then the tested nuclear-grade pressure transmitter is determined to be non-compliant. This embodiment mainly targets calibration items that require adjustment of the calibration potentiometer, such as potentiometer calibration and card calibration. Implementing this embodiment can facilitate the calibration of the corresponding sensors and processing cards by the operators. It should be noted that determining that the tested nuclear-grade pressure transmitter is non-compliant does not mean that both the sensor and the processing card in the tested nuclear-grade pressure transmitter are faulty. It may be caused by one of them being faulty. For example, in card calibration, the sensor in the tested nuclear-grade pressure transmitter may actually be normal, but the tested processing card may be determined to be non-compliant because it cannot meet the replacement requirements of the processing card to be replaced.

[0063] In an optional embodiment, step S10 further includes: if the verification item is a linear test, generating a first flow control signal for controlling the interaction between the sensor and the processing card, and sequentially generating a corresponding second pressure control signal according to a preset test point list; wherein, the preset test point list includes a number of test pressure values ​​and a measurement reference value corresponding to each test pressure value; each test pressure value is used to set the value of the second pressure control signal;

[0064] In step S20, verifying the tested nuclear-grade pressure transmitter based on the measurement signal and verification items further includes: comparing the measurement signal obtained after each output of the second pressure control signal with the corresponding measurement reference value to determine whether the tested nuclear-grade pressure transmitter meets the linearity requirements.

[0065] In this embodiment, a first flow control signal is first generated (input to the signal management unit) to close the switch controlling the AC signal output terminal of the sensor and the AC signal input terminal of the processing card within the signal management unit. Then, the test pressure values ​​from the preset test point list are sequentially acquired, and a corresponding second pressure control signal is generated based on the test pressure values ​​(input to the pressure unit) to input the corresponding linear test point pressure to the sensor. In this way, the measurement signals output by the processing card when the sensor inputs each test pressure value can be obtained. These measurement signals are compared with the corresponding measurement reference values ​​in the preset test point list. If the linearity of these measurement signals all conforms to the error range, it is determined that the tested nuclear-grade pressure transmitter meets the linearity requirements.

[0066] like Figure 2 As shown, the present invention also provides an offline calibration system for nuclear power plant transmitters, applicable to nuclear-grade pressure transmitters. The nuclear-grade pressure transmitter includes a sensor 8 and a processing card 9. The system includes:

[0067] The pressure application unit 1 is used to input the test pressure to the sensor 8 according to the pressure application control signal during calibration;

[0068] Signal measurement unit 2 is used to acquire and process the measurement signals output by card 9;

[0069] Signal management unit 3 is used to control the signal flow direction between sensor 8 and processing card 9 according to the flow direction control signal during verification; and

[0070] The main control unit 4 is used to generate pressure control signals and flow control signals according to the calibration items. During calibration, it also calibrates the nuclear pressure transmitter under test based on the acquired measurement signals and calibration items.

[0071] In an optional embodiment, the signal measurement unit 2 is also used to acquire the AC signal output by the sensor 8. Further, in a specific embodiment, such as... Figure 3 As shown, the nuclear power plant transmitter offline calibration system also includes a signal simulation unit 5 and a database 6. The signal simulation unit 5, connected to the signal management unit 3, is used to simulate the output signal of the sensor 8. The database 6 stores the AC signals collected when the sensor 8 passed previous calibrations. Correspondingly, the main control unit 4 also obtains the historical AC signals of the sensor 8 to be replaced through the database 6, and controls the signal simulation unit 5 to output simulated AC signals to the sensor 8 to be replaced for calibration.

[0072] In one alternative embodiment, such as Figure 3 As shown, the signal management unit 3 includes: a sensor interface 31, a switch 32, a card interface 33, a measurement unit interface 34, and an analog unit interface 35.

[0073] Specifically, the first, second, and third ends of the sensor interface 31 are sequentially connected to the first excitation signal input, the AC signal output, and the second excitation signal input of the sensor 8. The second end of the sensor interface 31 is also connected to the input of the switch 32. The output of the switch 32 is connected to the second end of the card interface 33. The first and third ends of the sensor interface 31 are also connected to the first and third ends of the card interface 33. The control end of the switch 32 is connected to the main control unit 4 (not shown) to control the switching on and off of the switch 32 according to the flow direction control signal. The first, second, third, fourth, and fifth ends of the card interface 33 are sequentially connected to the first excitation signal output of the processing card 9. The interface includes an AC signal input terminal, a second excitation signal output terminal, a first measurement signal output terminal, and a second measurement signal output terminal. The second, fourth, and fifth terminals of the card interface 33 are also connected to the first, third, and fourth terminals of the measurement unit interface 34. The first and second terminals of the measurement unit interface 34 are connected to the first measurement port of the signal measurement unit 2. The second terminal of the measurement unit interface 34 is grounded. The third and fourth terminals of the measurement unit interface 34 are connected to the second measurement port of the signal measurement unit 2. The first terminal of the analog unit interface 35 is connected to the second terminal of the card interface 33. The second terminal of the analog unit interface 35 is grounded. The first and second terminals of the analog unit interface 35 are also connected to the signal analog unit 5.

[0074] Specifically, the first measurement port of the signal measurement unit 2 is used to acquire the AC signal output by the sensor, and the second measurement port of the signal measurement unit 2 is used to acquire the measurement signal output by the processing card.

[0075] In one alternative embodiment, such as Figure 3 As shown, the signal management unit 3 also includes a power supply unit 7 for supplying power to the processing card 9. The input terminal of the power supply unit 7 is connected to the mains power, and the output terminal of the power supply unit 7 is connected to the power supply terminal of the card interface 33.

[0076] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0077] Those skilled in the art will further 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, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. 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 implementations should not be considered beyond the scope of this invention.

[0078] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0079] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for off-line verification of a nuclear power plant transmitter, suitable for a nuclear class pressure transmitter, said nuclear class pressure transmitter comprising a sensor and a processing card, characterized in that, The method includes the following steps: S10. Generate a flow control signal for controlling the signal flow between the sensor and the processing card during calibration, and a pressure control signal for controlling the magnitude of the test pressure input to the sensor during calibration, based on the calibration items; the calibration items include at least one of potentiometer calibration, linearity testing, and card calibration. S20. During the calibration, the measurement signal output by the processing card is acquired, and the nuclear pressure transmitter under test is calibrated according to the measurement signal and the calibration items. S20 further includes: after the tested nuclear-grade pressure transmitter has been verified as qualified, acquiring and recording the AC signal output by the sensor of the tested nuclear-grade pressure transmitter at the set test point, and using it as the historical AC signal of the corresponding sensor. S10 further includes: if the verification item is the card verification, generating a second flow control signal for controlling the sensor and the processing card to disconnect from interaction; In step S20, the step of verifying the tested nuclear-grade pressure transmitter based on the measurement signal and verification items further includes: acquiring the historical AC signal of the sensor of the processing card to be replaced, and inputting an analog AC signal simulating the historical AC signal into the processing card; then, by adjusting the position of the calibration potentiometer in the processing card, when the measurement signal output by the processing card is within the error range of the measurement signal output when the corresponding verification items were performed before the processing card to be replaced failed, determining that the processing card meets the replacement requirements of the processing card to be replaced.

2. The method of claim 1, wherein, S10 includes: if the calibration item is the potentiometer calibration, generating a first flow control signal for controlling the interaction between the sensor and the processing card, and generating a first pressure control signal according to the set calibration requirements; wherein, the potentiometer calibration includes zero-point calibration and range point calibration; In step S20, the step of verifying the tested nuclear-grade pressure transmitter according to the measurement signal and verification items includes: adjusting the position of the calibration potentiometer in the processing card so that the tested nuclear-grade pressure transmitter meets the zero point and range point requirements; wherein, the calibration potentiometer includes a zero point potentiometer and a range point potentiometer.

3. The method of claim 2, wherein, S20 further includes: If the tested nuclear-grade pressure transmitter cannot meet the relevant requirements by adjusting the position of the calibration potentiometer, then the tested nuclear-grade pressure transmitter is determined to be non-compliant.

4. The method of claim 2, wherein, S10 further includes: if the verification item is the linear test, generating the first flow direction control signal, and sequentially generating corresponding second pressure control signals according to the preset test point list; wherein, the preset test point list includes a plurality of test pressure values ​​and a measurement reference value corresponding to each of the test pressure values; each of the test pressure values ​​is used to set the value of the second pressure control signal; In S20, the step of verifying the tested nuclear-grade pressure transmitter according to the measurement signal and the verification item further includes: comparing the measurement signal obtained after each output of the second pressure control signal with the corresponding measurement reference value to determine whether the tested nuclear-grade pressure transmitter meets the linearity requirement.

5. The method of claim 4, wherein, S10 also includes: The signal flow between the sensor and the processing card is controlled by a preset signal management unit, the test pressure is input to the sensor by a pressure supply unit, and the measurement signal output by the processing card is acquired by a signal measurement unit.

6. A nuclear power plant transmitter off-line verification system, suitable for a nuclear class pressure transmitter, said nuclear class pressure transmitter comprising a sensor (8) and a processing card (9), characterized in that, The system includes: The pressure unit (1) is used to input the test pressure to the sensor (8) according to the pressure control signal during the calibration. The signal measurement unit (2) is used to acquire the measurement signal output by the processing card (9); The signal management unit (3) is used to control the signal flow direction between the sensor (8) and the processing card (9) according to the flow direction control signal during verification; and The main control unit (4) is used to generate the pressure control signal and flow control signal according to the verification items. During the verification, it also verifies the nuclear-grade pressure transmitter under test according to the acquired measurement signal and verification items. The verification items include at least one of potentiometer calibration, linearity test and card verification. The main control unit (4) is also used to: after the tested nuclear-grade pressure transmitter has passed the verification, acquire and record the AC signal output by the sensor of the tested nuclear-grade pressure transmitter at the set test point, and use it as the historical AC signal of the corresponding sensor; if the verification item is the card verification, generate a second flow control signal for controlling the sensor and the processing card to disconnect the interaction; acquire the historical AC signal of the sensor of the processing card to be replaced, and input a simulated AC signal simulating the historical AC signal to the processing card, and then, by adjusting the position of the calibration potentiometer in the processing card, when the measurement signal output by the processing card is within the error range of the measurement signal output when the corresponding verification item is performed before the failure of the processing card to be replaced, determine that the processing card meets the replacement requirements of the processing card to be replaced.

7. The nuclear power plant transmitter offline calibration system according to claim 6, characterized in that, The signal measurement unit (2) is also used to collect the AC signal output by the sensor (8); The nuclear power plant transmitter offline calibration system also includes a signal simulation unit (5) and a database (6). The signal simulation unit (5) is connected to the signal management unit (3) and is used to simulate the output signal of the sensor (8); The database (6) is used to store the AC signals collected when the sensor (8) was previously verified to be qualified; The main control unit (4) also obtains the historical AC signal of the sensor (8) of the card to be replaced through the database (6), and controls the signal simulation unit (5) to output the analog AC signal to the sensor (8) of the card to be replaced according to the historical AC signal, so as to perform card verification.

8. The nuclear power plant transmitter offline calibration system according to claim 7, characterized in that, The signal management unit (3) includes: a sensor interface (31), a switch (32), a card interface (33), a measurement unit interface (34), and an analog unit interface (35). The first, second, and third ends of the sensor interface (31) are connected in sequence to the first excitation signal input end, the AC signal output end, and the second excitation signal input end of the sensor (8). The second end of the sensor interface (31) is also connected to the input end of the switch (32). The output end of the switch (32) is connected to the second end of the card interface (33). The first and third ends of the sensor interface (31) are also connected to the first and third ends of the card interface (33). The control terminal of the switching switch (32) is connected to the main control unit (4) to control the switching switch (32) on and off according to the flow direction control signal; The first, second, third, fourth and fifth ends of the card interface (33) are connected in sequence to the first excitation signal output end, the AC signal input end, the second excitation signal output end, the first measurement signal output end and the second measurement signal output end of the processing card (9). The second, fourth and fifth ends of the card interface (33) are also connected to the first, third and fourth ends of the measurement unit interface (34). The first and second ends of the measurement unit interface (34) are connected to the first measurement port of the signal measurement unit (2), the second end of the measurement unit interface (34) is grounded, and the third and fourth ends of the measurement unit interface (34) are connected to the second measurement port of the signal measurement unit (2). The first end of the analog unit interface (35) is connected to the second end of the card interface (33), the second end of the analog unit interface (35) is grounded, and the first and second ends of the analog unit interface (35) are also connected to the signal analog unit (5).

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