Temperature transmitter calibration device and method

Abstract

The invention relates to the technical field of temperature transmitters, and discloses a temperature transmitter calibration device and method, the device comprises a temperature measurement standard appliance, a constant temperature device, a calibration instrument and a data acquisition and processor, the temperature measurement standard appliance and a temperature transmitter to be calibrated are respectively arranged in the constant temperature device, and the calibration instrument is arranged in the constant temperature device. The calibration instrument is connected with the constant temperature device, the temperature measurement standard appliance and the to-be-calibrated temperature transmitter, and the data acquisition and processing device is connected with the calibration instrument. According to the invention, the control signal is automatically issued, the data is automatically collected, the automatic calibration work is realized, and the efficiency and accuracy of the calibration work are improved.

Description

Background Art

[0002] With the rapid progress of my country's industrial technology, temperature control is particularly critical in many industrial processes. Especially in the fields of petrochemical, metallurgy, energy, electricity and other industries, accurate temperature monitoring is essential to ensure production efficiency and product quality. In this context, temperature transmitters, as an advanced measuring instrument, bear an indispensable responsibility in modern industrial temperature control systems and are widely used to achieve remote monitoring and control of temperature indicators. Due to the key role of temperature transmitters, the importance of their calibration work has also been paid attention to.

[0003] Since the temperature transmitter needs to be calibrated before use to ensure that each temperature transmitter can provide accurate readings within its operating range, the existing temperature transmitters have the following problems during calibration:

[0004] When calibrating the temperature transmitter, it is necessary to manually record the output current reading at each temperature calibration point and then perform error analysis on the output current reading. A large amount of test data is collected manually, which has a high error rate and low work efficiency, greatly increasing the workload. Summary of the invention

[0005] In order to overcome the problem that when a temperature transmitter is calibrated, a large amount of test data is manually collected, resulting in high error rate, low work efficiency and increased workload, the present invention provides a temperature transmitter calibration device and method.

[0006] In the first aspect, in order to solve the above technical problems, the present invention provides a temperature transmitter calibration device, including a temperature measurement standard instrument, a constant temperature device, a calibrator and a data acquisition and processor, wherein the temperature measurement standard instrument and the temperature transmitter to be calibrated are respectively arranged in the constant temperature device, the calibrator is respectively connected to the constant temperature device, the temperature measurement standard instrument and the temperature transmitter, and the data acquisition and processor is connected to the calibrator, wherein the data acquisition and processor are specifically used for:

[0007] Inputting different control signals to the thermostat in sequence through the calibrator; wherein the control signal represents adjusting the thermostat to a preset temperature;

[0008] When the thermostat is adjusted to the preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read by the calibrator respectively;

[0009] Calculate the standard current according to the real-time standard temperature corresponding to the current control signal, and perform error analysis on the output current corresponding to the current control signal and the standard current to determine the error result corresponding to the temperature transmitter under the current control signal;

[0010] The temperature transmitter is calibrated by a calibrator according to the error result corresponding to the temperature transmitter under the current control signal.

[0011] In a second aspect, the present invention provides a temperature transmitter calibration method, which is applied to a temperature transmitter calibration device, comprising:

[0012] Inputting different control signals to the thermostat in sequence through the calibrator; wherein the control signal represents adjusting the thermostat to a preset temperature;

[0013] When the thermostat is adjusted to the preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read by the calibrator respectively;

[0014] Calculate the standard current according to the real-time standard temperature corresponding to the current control signal, and perform error analysis on the output current corresponding to the current control signal and the standard current to determine the error result corresponding to the temperature transmitter under the current control signal;

[0015] The temperature transmitter is calibrated by a calibrator according to the error result corresponding to the temperature transmitter under the current control signal.

[0016] The beneficial effect of the present invention is that when the thermostat receives the current control signal and adjusts to the corresponding preset temperature, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read by the calibrator, so that the standard current under the current control signal can be calculated, and the error analysis of the standard current and the output current set is performed to obtain the error result of the temperature transmitter under the current control signal, and finally the temperature transmitter is calibrated by the error result. The present application automatically sends the control signal and automatically collects data, realizes the automated calibration work, and improves the efficiency and accuracy of the calibration work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a temperature transmitter calibration device according to an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure of a data acquisition and processor according to an embodiment of the present invention;

[0020] Figure 3 The present invention is a flow chart of a temperature transmitter calibration method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The following examples are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0022] A temperature transmitter calibration device and method according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, the present invention provides a temperature transmitter calibration device, including a temperature measurement standard instrument, a thermostat, a calibrator and a data acquisition and processor, wherein the temperature measurement standard instrument and the temperature transmitter to be calibrated are respectively arranged in the thermostat, the calibrator is respectively connected to the thermostat, the temperature measurement standard instrument and the temperature transmitter, and the data acquisition and processor is connected to the calibrator, wherein the data acquisition and processor are specifically used for:

[0024] Inputting different control signals to the thermostat in sequence through the calibrator; wherein the control signal represents adjusting the thermostat to a preset temperature;

[0025] When the thermostat is adjusted to the preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read by the calibrator respectively;

[0026] Calculate the standard current according to the real-time standard temperature corresponding to the current control signal, and perform error analysis on the output current corresponding to the current control signal and the standard current to determine the error result corresponding to the temperature transmitter under the current control signal;

[0027] The temperature transmitter is calibrated by a calibrator according to the error result corresponding to the temperature transmitter under the current control signal.

[0028] In this embodiment, when the thermostat receives the current control signal and adjusts to the corresponding preset temperature, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read by the calibrator, so that the standard current under the current control signal can be calculated, and the error analysis of the standard current and the output current set is performed to obtain the error result of the temperature transmitter under the current control signal, and finally the temperature transmitter is calibrated by the error result. This application automatically sends the control signal and automatically collects data, realizes the automated calibration work, and improves the efficiency and accuracy of the calibration work.

[0029] In this embodiment, the calibrator can automatically receive the control signal sent by the data acquisition and processor, and the data acquisition and processor automatically sets the control signal that needs to be input according to the pre-edited program, and no manual operation is required throughout the process. In addition, the data acquisition and processor automatically collects and analyzes data, avoiding frequent manual input signal adjustment and equipment switching, which are likely to cause interference, affect the test accuracy, and may even damage the test instrument.

[0030] The function of the temperature transmitter in this embodiment is to convert the temperature variable into a transmittable output signal for measuring and controlling temperature parameters, and usually includes two parts: a sensor and a signal converter. The sensor is generally a thermal resistor or a thermocouple, and the signal converter is composed of a conversion unit, a signal processing unit, and a measurement unit. The temperature transmitter can convert the resistance value or temperature variable of the sensor into a standardized direct current signal. Common output signals include (0∽10)mA and (4∽20)mA, that is, when the temperature transmitter is in different temperature environments, the data acquisition and processor can directly read the output current of the temperature transmitter at different temperatures.

[0031] Optionally, the data acquisition and processor is specifically used for: when the constant temperature device is adjusted to the preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are repeatedly read by the calibrator for a preset number of times; the standard current is calculated according to the real-time standard temperatures corresponding to the current control signal, and the average value of the output currents corresponding to the current control signal and the standard current are subjected to error analysis to determine the error result corresponding to the temperature transmitter under the current control signal.

[0032] The preset number of times in this embodiment can be set according to actual conditions. Preferably, it is 6 times in this embodiment, that is, when the constant temperature device is adjusted to the preset temperature corresponding to the current control signal, it is necessary to repeatedly read the real-time standard temperature 6 times through the temperature measurement standard instrument. In addition, a time interval can be set between two adjacent temperature data readings, for example, reading once every 5 minutes.

[0033] Optionally, the data acquisition and processor is specifically used to: obtain the average current value of each output current corresponding to the current control signal, and the average temperature value of each real-time standard temperature; calculate the standard current corresponding to the current control signal based on the average temperature value corresponding to the current control signal; and use the difference between the average current value corresponding to the current control signal and the standard current as the error result corresponding to the temperature transmitter under the current control signal.

[0034] In this embodiment, when performing error analysis, the real-time standard temperature and output current are obtained by repeatedly reading and then calculating the average value, thereby further improving the accuracy of the data.

[0035] Optionally, the data acquisition and processor is specifically used to: use the difference between the average current value corresponding to the current control signal and the standard current as the error result corresponding to the temperature transmitter under the current control signal, and the formula is as follows:

[0036]

[0037] Among them, ΔA tIndicates the error result of the temperature transmitter under the current control signal. Respectively represent the average current value and average temperature value corresponding to the current control signal, A m Indicates the output range of the thermostat output current, A0 indicates the theoretical lower limit of the thermostat output current, t m It indicates the range of the temperature adjustment of the thermostat, t0 indicates the lower limit of the temperature adjustment of the thermostat, Indicates standard current.

[0038] In this embodiment, the above formula can directly obtain the error analysis result of the temperature transmitter under the current control signal, and can intuitively observe the error between the output current of the temperature transmitter and the standard current, providing reliable data support and quality assurance for temperature measurement and control in the entire industrial production application.

[0039] Optionally, the data acquisition and processor is specifically used to: compare the error result corresponding to each control signal with a preset threshold value to obtain a judgment result corresponding to each control signal; wherein, if the error result is less than the preset threshold value, the judgment result is in compliance with the requirement; if the error result is greater than or equal to the preset threshold value, the judgment result is not in compliance with the requirement;

[0040] If the judgment result corresponding to any control signal is not in compliance with the requirements, a control signal is input to the thermostat through the calibration instrument, and the thermostat is controlled to adjust to the upper limit temperature and the lower limit temperature;

[0041] When the thermostat is adjusted to the upper and lower temperature limits, the parameters of the temperature transmitter are adjusted by the calibration instrument so that the judgment results of the temperature transmitter corresponding to the upper and lower temperature limits respectively meet the requirements;

[0042] Re-inputting different control signals into the constant temperature device through a calibration instrument, and obtaining a judgment result corresponding to each control signal;

[0043] If the judgment result corresponding to each control signal meets the requirements, the calibration is successful;

[0044] If the judgment result corresponding to any control signal still does not meet the requirements, the calibration fails and a new temperature sensor is replaced.

[0045] In this embodiment, when the judgment result is that it does not meet the requirements, it can be judged that there is a deviation / out-of-tolerance in the temperature transmitter, and the constant temperature device needs to be calibrated by a calibrator to ensure that its measurement accuracy meets the qualified requirements and reduce the measurement error.

[0046] In addition, if the temperature transmitter cannot be calibrated by continuously adjusting the parameters of the temperature transmitter through the calibrator, it may be that the temperature sensor is aging and needs to be replaced.

[0047] Optionally, the data acquisition and processor is also used to generate a calibration report when calibrating the temperature transmitter under the current control signal. The calibration report includes the preset temperature corresponding to the current control signal, various real-time standard temperatures, various output currents, standard currents, error results, judgment results and parameters of the temperature transmitter after calibration is completed.

[0048] In this embodiment, when the temperature transmitter is calibrated, a calibration report can be generated in real time, which is convenient for the staff to monitor the calibration process in real time and view the calibration records.

[0049] Optionally, the data acquisition and processor is also used to: when the constant temperature device reaches a preset temperature corresponding to the current control signal, keep the temperature stable for a preset period of time and then start reading the real-time standard temperature and output current.

[0050] In this embodiment, the preset time is set according to actual conditions. Preferably, in this embodiment, it is not less than 30 minutes, that is, the temperature is kept stable for not less than 30 minutes before reading the real-time standard temperature and output current.

[0051] In this embodiment, the real-time standard temperature is read after the temperature in the thermostatic device is stabilized, thereby improving the accuracy of data reading.

[0052] Optionally, the constant temperature device is an intelligent precision water tank, an intelligent precision oil tank or an intelligent dry body furnace.

[0053] In this embodiment, the intelligent precision water tank, intelligent precision oil tank or intelligent dry body furnace can be applicable to the needs of petrochemical, metallurgical, energy, electric power and other industries.

[0054] Optionally, the temperature measurement standard instrument is a second-class or above standard platinum resistance thermometer.

[0055] In this embodiment, the second-class and above standard platinum resistance thermometer has high precision, good stability and a wide temperature measurement range.

[0056] Optionally, the data acquisition and processor includes a data acquisition module, a signal processing module, an automatic control module, a data processing and analysis module, a data storage and management module, a human-computer interaction module and a network communication module, wherein Figure 2 As shown, the human-computer interaction module is connected to the automatic control module, the automatic control module is respectively connected to the temperature measurement standard instrument and the calibrator, the data acquisition module is connected to the temperature measurement standard instrument, the calibrator, the data processing and analysis module and the temperature transmitter (not shown), the data processing and analysis module is connected to the data storage and management module, and the data storage and management module is connected to the network communication module.

[0057] In this embodiment, the human-computer interaction module provides a user-friendly interactive interface between the user and the system, allowing the operator to set parameters, start and monitor the calibration process, view real-time data and results, generate and print calibration reports, and supports multiple languages ​​and custom settings. In addition, the user interaction interface can also allow the user to view and print calibration reports.

[0058] In this embodiment, the automatic control module sends control instructions to the calibrator and the temperature measurement standard instrument to control them to perform their own functions.

[0059] In this embodiment, the data acquisition module reads the temperature data of the temperature measurement standard instrument and the output current of the temperature transmitter in real time.

[0060] In this embodiment, the data processing and analysis module filters and amplifies the signal collected by the data acquisition module, effectively removes noise and interference, improves signal accuracy and stability, and performs preliminary processing to ensure data quality.

[0061] In addition, the data processing and analysis module also organizes and integrates the collected data, performs corresponding calibration calculations (including calculation of standard current, calculation of average temperature value and calculation of average current value) and error analysis (error analysis of average current value and standard current), evaluates data accuracy, and generates a detailed calibration report.

[0062] The data storage and management module in this embodiment ensures the safe storage of all calibration data, supports multiple data backup and recovery strategies, and supports data query and history record management.

[0063] The network communication module in this embodiment supports remote data transmission, system integration, remote monitoring and shared management, supports multiple communication protocols, can realize data acquisition and secure communication between the processor and external devices or networks, and with enterprise management systems or the cloud, and realize remote transmission and sharing functions.

[0064] Optionally, a temperature transmitter calibration method is described with a specific embodiment, as follows:

[0065] S11. Complete the preparation of various equipment.

[0066] S12. Setting calibration parameters for the calibrator, the calibration parameters including temperature calibration points (in this embodiment, the number of calibration temperature points is 5 or 7) and a preset time (in this embodiment, not less than 30 minutes).

[0067] S13. Start the constant temperature device (intelligent precision water tank / intelligent precision oil tank / intelligent dry block furnace). The calibrator sends a control signal to the constant temperature device to make it reach the first temperature calibration point and keep it stable for 30 minutes. Then, the real-time standard temperature is collected through the temperature measurement standard instrument (second-class standard platinum resistance thermometer / first-class standard platinum resistance thermometer / working reference platinum resistance thermometer).

[0068] S14, the data acquisition and processor simultaneously repeats 6 times to read the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter.

[0069] S15. Repeat S13-S14 to complete data collection corresponding to each calibration temperature point.

[0070] S16. Calculate the average current value and the standard current corresponding to each calibration temperature point, and obtain the error result of the average current value and the standard current corresponding to each calibration temperature point.

[0071] S17. Determine whether the error result of each calibration temperature point meets the requirements. If any calibration temperature point does not meet the requirements, adjust the constant temperature device to the upper and lower temperature limits in turn through the calibrator, and adjust the parameters of the constant temperature device through the calibrator to calibrate the upper and lower temperature points. After the calibration is successful, input the control signal corresponding to the same calibration temperature point to the constant temperature device through the calibrator, and perform a calibration test to observe whether the error result of the average current value and the standard current is reduced or meets the requirements.

[0072] like Figure 3 As shown, the present invention provides a temperature transmitter calibration method, comprising:

[0073] S1. Input different control signals to the thermostat in sequence through a calibrator; wherein the control signal represents adjusting the thermostat to a preset temperature.

[0074] S2. When the thermostat is adjusted to the preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read by the calibrator respectively.

[0075] S3. Calculate the standard current according to the real-time standard temperature corresponding to the current control signal, and perform error analysis on the output current corresponding to the current control signal and the standard current to determine the error result corresponding to the temperature transmitter under the current control signal.

[0076] S4. Calibrate the temperature transmitter using a calibrator according to the error result corresponding to the temperature transmitter under the current control signal.

[0077] Optionally, when the thermostat is adjusted to a preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read respectively by the calibrator;

[0078] The standard current is calculated according to the real-time standard temperature corresponding to the current control signal, and the error analysis is performed between the output current corresponding to the current control signal and the standard current to determine the error result corresponding to the temperature transmitter under the current control signal, including:

[0079] When the thermostat is adjusted to the preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are repeatedly read by the calibrator for a preset number of times;

[0080] The standard current is calculated according to each real-time standard temperature corresponding to the current control signal, and the average value of each output current corresponding to the current control signal and the standard current are subjected to error analysis to determine the error result corresponding to the temperature transmitter under the current control signal.

[0081] Optionally, the standard current is calculated according to each real-time standard temperature corresponding to the current control signal, and the error analysis is performed between each output current corresponding to the current control signal and the standard current to determine the error result corresponding to the temperature transmitter under the current control signal, including:

[0082] Obtain the average current value of each output current corresponding to the current control signal, and the average temperature value of each real-time standard temperature;

[0083] Calculate the standard current corresponding to the current control signal according to the average temperature value corresponding to the current control signal;

[0084] The difference between the average current value corresponding to the current control signal and the standard current is taken as the error result corresponding to the current control signal.

[0085] Optionally, the difference between the average current value corresponding to the current control signal and the standard current is used as the error result corresponding to the current control signal, which is expressed as follows:

[0086]

[0087] Where ΔA t Indicates the error result of the temperature transmitter under the current control signal. Respectively represent the average current value and average temperature value corresponding to the current control signal, A m Indicates the output range of the thermostat output current, A0 indicates the theoretical lower limit of the thermostat output current, t m It indicates the range of the temperature adjustment of the thermostat, t0 indicates the lower limit of the temperature adjustment of the thermostat, Indicates standard current.

[0088] Optionally, according to the error result corresponding to the temperature transmitter under the current control signal, the temperature transmitter is calibrated by a calibrator, including:

[0089] Compare the error result corresponding to each control signal with a preset threshold value to obtain a judgment result corresponding to each control signal; wherein, if the error result is less than the preset threshold value, the judgment result is in compliance with the requirement; if the error result is greater than or equal to the preset threshold value, the judgment result is not in compliance with the requirement;

[0090] If the judgment result corresponding to any control signal is not in compliance with the requirements, a control signal is input to the thermostat through the calibration instrument, and the thermostat is controlled to adjust to the upper limit temperature and the lower limit temperature;

[0091] When the thermostat is adjusted to the upper and lower temperature limits, the parameters of the temperature transmitter are adjusted by the calibration instrument so that the judgment results of the temperature transmitter corresponding to the upper and lower temperature limits respectively meet the requirements;

[0092] Re-inputting different control signals into the constant temperature device through a calibration instrument, and obtaining a judgment result corresponding to each control signal;

[0093] If the judgment result corresponding to each control signal meets the requirements, the calibration is successful;

[0094] If the judgment result corresponding to any control signal still does not meet the requirements, the calibration fails and a new temperature sensor is replaced.

[0095] Optionally, calibrating the temperature transmitter by the calibrator according to the error result corresponding to the temperature transmitter under the current control signal also includes:

[0096] When the temperature transmitter under the current control signal is calibrated, a calibration report is generated, which includes the preset temperature corresponding to the current control signal, each real-time standard temperature, each output current, standard current, error result, judgment result and parameters of the temperature transmitter after calibration.

[0097] Optionally, when the thermostat is adjusted to a preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read respectively, and the method further includes:

[0098] When the thermostat reaches the preset temperature corresponding to the current control signal, it keeps the temperature stable for a preset time and then starts to read the real-time standard temperature and output current.

[0099] The embodiment of the present invention also provides a computing device, including a memory, a manager, and a program stored in the memory and running on the manager. When the manager executes the program, some or all steps of the above-mentioned temperature transmitter calibration method are implemented.

[0100] Among them, the computing device can be a computer, and correspondingly, its program is computer software. The above parameters and steps in the computing device of the present invention can refer to the parameters and steps in the embodiment of a temperature transmitter calibration method mentioned above, and will not be repeated here.

[0101] Those skilled in the art know that the present invention can be implemented as a system, method or computer program product. Therefore, the present disclosure can be specifically implemented in the following forms, namely: it can be complete hardware, it can be complete software (including firmware, resident software, microcode, etc.), or it can be a combination of hardware and software, generally referred to as "circuit", "module" or "system" herein. In addition, in some embodiments, the present invention can also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium contains computer-readable program code. Computer-readable storage media can be, for example, but not limited to - electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above.

[0102] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0103] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A temperature transmitter calibration device, characterized in that: The device comprises a temperature measurement standard instrument, a thermostat, a calibrator and a data acquisition and processor. The temperature measurement standard instrument and the temperature transmitter to be calibrated are respectively arranged in the thermostat. The calibrator is respectively connected to the thermostat, the temperature measurement standard instrument and the temperature transmitter. The data acquisition and processor is connected to the calibrator. The data acquisition and processor is specifically used for: Inputting different control signals to the thermostat in sequence through a calibration instrument; wherein the control signal represents adjusting the thermostat to a preset temperature; When the thermostat is adjusted to the preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read respectively by the calibrator; Calculate the standard current according to the real-time standard temperature corresponding to the current control signal, and perform error analysis on the output current corresponding to the current control signal and the standard current to determine the error result corresponding to the temperature transmitter under the current control signal; The temperature transmitter is calibrated by the calibration instrument according to the error result corresponding to the temperature transmitter under the current control signal.

2. The device according to claim 1, characterized in that The data acquisition and processor is specifically used for: When the thermostat is adjusted to a preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are repeatedly read by the calibrator for a preset number of times; The standard current is calculated according to each real-time standard temperature corresponding to the current control signal, and the average value of each output current corresponding to the current control signal and the standard current are subjected to error analysis to determine the error result corresponding to the temperature transmitter under the current control signal.

3. The device according to claim 2, characterized in that The data acquisition and processor is specifically used for: Obtain the average current value of each output current corresponding to the current control signal, and the average temperature value of each real-time standard temperature; Calculate the standard current corresponding to the current control signal according to the average temperature value corresponding to the current control signal; The difference between the average current value corresponding to the current control signal and the standard current is used as the error result corresponding to the temperature transmitter under the current control signal.

4. The device according to claim 3, characterized in that The data acquisition and processor is specifically used for: The difference between the average current value corresponding to the current control signal and the standard current is used as the error result corresponding to the temperature transmitter under the current control signal. The formula is as follows: Where ΔA t Indicates the error result of the temperature transmitter under the current control signal. Respectively represent the average current value and the average temperature value corresponding to the current control signal, A m Indicates the output range of the thermostat output current, A0 indicates the theoretical lower limit of the thermostat output current, t m It indicates the range of the temperature adjustment of the thermostat, t0 indicates the lower limit of the temperature adjustment of the thermostat, Indicates standard current.

5. The device according to claim 1, characterized in that The data acquisition and processor are specifically used to include: Compare the error result corresponding to each control signal with a preset threshold value to obtain a judgment result corresponding to each control signal; wherein, if the error result is less than the preset threshold value, the judgment result is in compliance with the requirement; and if the error result is greater than or equal to the preset threshold value, the judgment result is not in compliance with the requirement; If the judgment result corresponding to any control signal is not in compliance with the requirements, a control signal is input to the thermostat through the calibration instrument, and the thermostat is controlled to adjust to the upper limit temperature and the lower limit temperature; When the thermostat is adjusted to the upper and lower temperature limits, the parameters of the temperature transmitter are adjusted by the calibration instrument so that the judgment results of the temperature transmitter corresponding to the upper and lower temperature limits respectively meet the requirements; Re-inputting different control signals into the constant temperature device through a calibration instrument, and obtaining a judgment result corresponding to each control signal; If the judgment result corresponding to each control signal meets the requirements, the calibration is successful; If the judgment result corresponding to any control signal still does not meet the requirements, the calibration fails and a new temperature sensor is replaced.

6. The device according to claim 5, characterized in that The data acquisition and processor is also used for: When the temperature transmitter under the current control signal is calibrated, a calibration report is generated, which includes the preset temperature corresponding to the current control signal, each real-time standard temperature, each output current, standard current, error result, judgment result and parameters of the temperature transmitter after calibration.

7. The device according to any one of claims 1 to 6, characterized in that: The data acquisition and processor is also used for: When the thermostat reaches the preset temperature corresponding to the current control signal, it keeps the temperature stable for a preset time and then starts to read the real-time standard temperature and output current.

8. The device according to any one of claims 1 to 6, characterized in that: The constant temperature device is an intelligent precision water tank, an intelligent precision oil tank or an intelligent dry body furnace.

9. The device according to any one of claims 1 to 6, characterized in that: The temperature measurement standard instrument is a second-class or above standard platinum resistance thermometer.

10. A temperature transmitter calibration method, characterized in that: The temperature transmitter calibration device according to any one of claims 1 to 9 comprises: Inputting different control signals to the thermostat in sequence through a calibration instrument; wherein the control signal represents adjusting the thermostat to a preset temperature; When the thermostat is adjusted to the preset temperature corresponding to the current control signal, the real-time standard temperature obtained by the temperature measurement standard instrument and the output current of the temperature transmitter are read respectively by the calibrator; Calculate the standard current according to the real-time standard temperature corresponding to the current control signal, and perform error analysis on the output current corresponding to the current control signal and the standard current to determine the error result corresponding to the temperature transmitter under the current control signal; The temperature transmitter is calibrated by the calibration instrument according to the error result corresponding to the temperature transmitter under the current control signal.

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