A method for dynamic compensation of temperature and pressure calibration of a gas tightness tester
Patent Information
- Application Number
- CN202610977983.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-02
- Publication Date
- 2026-10-09
AI Technical Summary
[0003]然而，在实际工业检测场景中，气密仪的检测精度受到多种因素的共同制约，一方面压力传感器在长期使用过程中，其零位输出会逐渐偏离理论零值，零点漂移现象普遍存在，导致即使气路内部实际压力为零，传感器读数仍为非零值，该误差直接传递至泄漏计算结果，另一方面压缩气体在充入被测工件过程中会产生温度变化，且环境温度亦非恒定，而压力与温度呈正相关关系，温度波动直接引起压力读数的相应变化，使测量结果中混入因温度变化引起的虚假压力分量，无法真实反映被测工件的实际泄漏状况，而为了解决上述问题，部分现有气密仪虽分别设置有零点校准功能和温度补偿功能，但二者通常相互独立运行，零点校准结果并未传输至温度补偿环节加以利用，导致温度补偿仍然基于包含零点漂移误差的压力值进行计算，且零点校准与温度补偿各自独立发挥作用，两个校正环节之间缺乏数据交互，无法形成协同增益
[0012]与现有技术相比，本发明的有益效果是：通过接收用户输入的检测参数，并采集压力传感器输出的第一实时压力值，待第一实时压力值稳定于零值后关闭排气电磁阀，将当前压力传感器读数标定为零点基准值，并采集温度传感器输出的实时温度值和压力传感器输出的第二实时压力值，根据零点基准值对第二实时压力值进行零点校正，并根据实时温度值按预设补偿算法对经零点校正后的第二压力值进行温度补偿，以获得实际压力值，并在稳压阶段结束后记录第一时刻的第一实际压力值，在检测阶段结束后记录第二时刻的第二实际压力值，基于检测时间计算每分钟泄漏量，结合泄漏阈值进行比对，对检测结果进行合格判定，并控制显示设备输出检测结果，通过将零点校准单元与温度补偿单元以数据流串联方式集成于同一检测流程中，使零点基准值直接参与温度补偿环节的零点校正，并将补偿后的实际压力值输入泄漏检测单元，形成完整的协同数据处理链，以消除零点漂移和温度变化对检测精度的双重影响，实现气密仪检测系统精度的整体提升。
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Abstract
Description
Technical Field
[0001] This invention relates to the field of airtightness testing technology, specifically to a method for dynamic temperature compensation and pressure calibration of airtightness testing. Background Technology
[0002] Air tightness testers are widely used in the sealing test of products such as automotive parts, lithium battery packaging, medical devices, electronic components and packaging containers. Traditional air tightness testers usually rely solely on pressure sensors to measure pressure difference. By comparing the pressure difference between the start and end of the test phase, and combining the test time, the leakage rate of the tested workpiece is calculated, thereby determining whether the workpiece has leakage defects.
[0003] However, in actual industrial testing scenarios, the detection accuracy of air tightness testers is constrained by a variety of factors. On the one hand, during long-term use, the zero-point output of pressure sensors gradually deviates from the theoretical zero value, and zero-point drift is a common phenomenon. This means that even if the actual pressure inside the gas path is zero, the sensor reading is still non-zero, and this error is directly transmitted to the leakage calculation result. On the other hand, the compressed gas will generate temperature changes during the process of filling the workpiece under test, and the ambient temperature is not constant. Since pressure and temperature are positively correlated, temperature fluctuations directly cause corresponding changes in the pressure reading, causing the measurement result to be mixed with false pressure components caused by temperature changes, which cannot truly reflect the actual leakage status of the workpiece under test. In order to solve the above problems, although some existing air tightness testers are equipped with zero-point calibration and temperature compensation functions, the two usually operate independently. The zero-point calibration result is not transmitted to the temperature compensation stage for use, so the temperature compensation is still calculated based on the pressure value including the zero-point drift error. Moreover, the zero-point calibration and temperature compensation function independently, and there is a lack of data interaction between the two calibration stages, so they cannot form a synergistic gain.
[0004] Therefore, in view of this, the present invention proposes a method for dynamic temperature compensation and pressure calibration of airtightness tester to make up for and improve the deficiencies of the prior art. Summary of the Invention
[0005] To address the aforementioned technical problems, this invention provides a method for dynamic temperature compensation and pressure calibration of an airtightness meter, thereby resolving the corresponding technical issues raised in the background section.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for dynamic temperature compensation and pressure calibration of an airtightness tester, comprising a data acquisition unit, a zero-point calibration unit, a temperature compensation unit, a leak detection unit, and a judgment output unit; The data acquisition unit is used to receive detection parameters input by the user, including leak detection pressure value, inflation time, pressure stabilization time, detection time and leakage threshold, and send the detection parameters to the zero-point calibration unit. The zero-point calibration unit is used to acquire detection parameters and collect the first real-time pressure value output by the pressure sensor. After the first real-time pressure value stabilizes at zero, the exhaust solenoid valve is closed, the current pressure sensor reading is calibrated as the zero-point reference value, and sent to the temperature compensation unit. The temperature compensation unit is used to obtain a zero-point reference value, and to collect the real-time temperature value output by the temperature sensor and the second real-time pressure value output by the pressure sensor. Based on the zero-point reference value, the second real-time pressure value is zero-point corrected, and based on the real-time temperature value, the zero-point corrected second pressure value is temperature-compensated according to a preset compensation algorithm to obtain the actual pressure value, which is then sent to the leakage detection unit. The leakage detection unit is used to obtain the actual pressure value, record the first actual pressure value at the first moment after the pressure stabilization phase ends, record the second actual pressure value at the second moment after the detection phase ends, calculate the leakage per minute based on the detection time, and send it to the judgment output unit. The judgment output unit is used to obtain the leakage amount per minute, compare it with the leakage threshold, judge the detection result as qualified, and control the display device to output the detection result.
[0007] As a preferred method, the specific process for calibrating the current pressure sensor reading to the zero-point reference value is as follows: S101. Obtain the leak detection pressure value. Inflation time stabilization time Detection time and leakage threshold Open the exhaust solenoid valve to connect the air passage to the atmosphere, and the system will begin to exhaust air. S102, with a fixed sampling period The first real-time pressure value output by the pressure sensor is continuously acquired. ,and ; S103, Judgment Does it satisfy the zero-value stability condition? - And it satisfies this condition N times consecutively, where, The preset stability threshold is N, and the preset number of times is N. S104. After the stability condition is met, close the exhaust solenoid valve to block the air path and cut off the connection between the air path and the atmosphere, and read the current output value of the pressure sensor and calibrate it as the zero-point reference value: .
[0008] As a preferred method, the specific process for obtaining the actual pressure value is as follows: S201. Obtain the zero-point reference value Open the charging solenoid valve and press the leak detection pressure value. Inflate the workpiece under test with air for a period of time. After inflation, the pressure stabilization phase begins, lasting for [duration]. During the period of fixed sampling Synchronously acquire real-time temperature values output by the temperature sensor and the second real-time pressure value output by the pressure sensor ; S202. After the voltage stabilization phase ends, the testing phase begins, and the testing time is... During this period, data collection continued synchronously. and ; S203. Perform zero-point correction by subtracting zero from the second real-time pressure value at each moment, and calculate the zero-point corrected pressure value. : in, This is the current raw reading from the pressure sensor; S204, Based on real-time temperature value Temperature compensation is performed according to a preset compensation algorithm, which uses a second-order polynomial model to calculate the actual pressure value. Its formula is: in, This is the first-order temperature compensation coefficient, obtained through multi-point temperature calibration fitting before leaving the factory; This is a second-order temperature compensation coefficient used to correct nonlinear temperature drift; This is the preset standard reference temperature.
[0009] As a preferred method, the specific process for calculating the leakage rate per minute based on the detection time is as follows: S301, Obtain the actual pressure value And determine whether the current time is the end of the voltage stabilization phase: ,in, Indicates the first moment; At the first moment Record the first actual pressure value ; S302. Entering the testing phase, the testing time is... During this period, it continued to receive And determine whether the current time is the end of the detection phase: ; in, Indicates the second moment; Second moment , recording a second actual pressure value ; S303, calculating a pressure variation within the detection phase , the formula thereof is: wherein, if the workpiece has no leakage, ; if leakage exists, , ; S304, based on the pressure variation , calculating a leakage rate per minute Q, the formula thereof is: wherein, V is the volume of the workpiece to be measured, obtained by standard volume calibration before delivery from the factory; is a pressure drop rate; multiplied by for normalization, converting pressure variation into gas volume variation via V, and dividing by to eliminate the influence of initial pressure difference.
[0010] preferably, the specific process of controlling a display device to output a detection result is as follows: S401, acquiring the leakage rate per minute Q, and performing conformity judgment based on a leakage threshold as follows: if , the judgment result is qualified, indicating that the actually measured leakage rate does not exceed the allowable upper limit and the sealing performance of the workpiece is qualified; if , the judgment result is unqualified, indicating that the actually measured leakage rate exceeds the allowable upper limit and the workpiece has a leakage defect; S402, generating a detection result data packet based on the conformity judgment result, the content of which includes a judgment conclusion, the leakage rate per minute Q, the leakage threshold , a zero reference value , a temperature during detection and a leak detection pressure value , wherein, the temperature during detection is retrieved from historical data of a temperature compensation unit as the temperature value at the moment; S403, controlling the display device to output the detection result; if the judgment is unqualified, an audible and visual alarm signal is triggered, and a control signal can be output to a production line actuator.
[0011] preferably, the judgment output unit further specifically comprises: calculating a relative leakage rate It is used to assist in the assessment, and its formula is: Among them, relative leakage rate It is used to reflect the proportion of the current leakage to the maximum allowable leakage, so that users can judge the margin.
[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: By receiving the detection parameters input by the user and acquiring the first real-time pressure value output by the pressure sensor, after the first real-time pressure value stabilizes at zero, the exhaust solenoid valve is closed, the current pressure sensor reading is calibrated as the zero-point reference value, and the real-time temperature value output by the temperature sensor and the second real-time pressure value output by the pressure sensor are acquired. The second real-time pressure value is zero-point calibrated according to the zero-point reference value, and temperature compensation is performed on the zero-point calibrated second pressure value according to the real-time temperature value using a preset compensation algorithm to obtain the actual pressure value. The first real-time pressure value is recorded at the first moment after the pressure stabilization phase ends. The system records the second actual pressure value at the second moment after the detection phase ends. Based on the detection time, it calculates the leakage rate per minute, compares it with the leakage threshold, judges the test results as qualified, and controls the display device to output the test results. By integrating the zero-point calibration unit and the temperature compensation unit into the same detection process in a data stream serial manner, the zero-point reference value directly participates in the zero-point correction of the temperature compensation link, and the compensated actual pressure value is input into the leakage detection unit to form a complete collaborative data processing chain. This eliminates the dual impact of zero-point drift and temperature change on the detection accuracy, and achieves an overall improvement in the accuracy of the airtightness tester system. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the detection parameter structure shown in the present invention; Figure 3 This is a flowchart illustrating the output of detection results by the control and display device of the present invention. Detailed Implementation
[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0015] Embodiments of the present invention: Please refer to Figures 1 to 3As shown, a method for dynamic temperature compensation and pressure calibration of an airtightness tester includes a data acquisition unit, a zero-point calibration unit, a temperature compensation unit, a leak detection unit, and a judgment output unit. The data acquisition unit is used to receive the detection parameters input by the user, including the leak detection pressure value, inflation time, pressure stabilization time, detection time and leakage threshold, and send the detection parameters to the zero-point calibration unit; The zero-point calibration unit is used to acquire detection parameters and collect the first real-time pressure value output by the pressure sensor. After the first real-time pressure value stabilizes at zero, the exhaust solenoid valve is closed, the current pressure sensor reading is calibrated as the zero-point reference value, and sent to the temperature compensation unit. The temperature compensation unit is used to obtain the zero-point reference value, and to collect the real-time temperature value output by the temperature sensor and the second real-time pressure value output by the pressure sensor. Based on the zero-point reference value, the second real-time pressure value is zero-point calibrated, and based on the real-time temperature value, the zero-point calibrated second pressure value is temperature-compensated according to a preset compensation algorithm to obtain the actual pressure value, which is then sent to the leakage detection unit. The leakage detection unit is used to obtain the actual pressure value, record the first actual pressure value at the first moment after the pressure stabilization phase ends, record the second actual pressure value at the second moment after the detection phase ends, calculate the leakage per minute based on the detection time, and send it to the judgment output unit. The output unit is used to obtain the leakage amount per minute, compare it with the leakage threshold, determine the pass / fail status of the detection results, and control the display device to output the detection results.
[0016] The specific process for calibrating the current pressure sensor reading to the zero-point reference value is as follows: S101. Obtain the leak detection pressure value. Inflation time stabilization time Detection time and leakage threshold Open the exhaust solenoid valve to connect the air passage to the atmosphere, and the system will begin to exhaust air. S102, with a fixed sampling period The first real-time pressure value output by the pressure sensor is continuously acquired. ,and ; S103, Judgment Does it satisfy the zero-value stability condition? - And it satisfies this condition N times consecutively, where, The preset stability threshold is N, and the preset number of times is N. S104. After the stability condition is met, close the exhaust solenoid valve to block the air path and cut off the connection between the air path and the atmosphere, and read the current output value of the pressure sensor and calibrate it as the zero-point reference value: .
[0017] The specific process for obtaining the actual pressure value is as follows: S201. Obtain the zero-point reference value Open the charging solenoid valve and press the leak detection pressure value. Inflate the workpiece under test with air for a period of time. After inflation, the pressure stabilization phase begins, lasting for [duration]. During the period of fixed sampling Synchronously acquire real-time temperature values output by the temperature sensor and the second real-time pressure value output by the pressure sensor ; S202. After the voltage stabilization phase ends, the testing phase begins, and the testing time is... During this period, data collection continued synchronously. and ; S203. Perform zero-point correction by subtracting zero from the second real-time pressure value at each moment, and calculate the zero-point corrected pressure value. : in, This is the current raw reading from the pressure sensor; S204, Based on real-time temperature value Temperature compensation is performed according to a preset compensation algorithm, which uses a second-order polynomial model to calculate the actual pressure value. Its formula is: in, This is the first-order temperature compensation coefficient, obtained through multi-point temperature calibration fitting before leaving the factory; This is a second-order temperature compensation coefficient used to correct nonlinear temperature drift; This is the preset standard reference temperature.
[0018] The specific process for calculating the leakage rate per minute based on the detection time is as follows: S301, Obtain the actual pressure value And determine whether the current time is the end of the voltage stabilization phase: ,in, Indicates the first moment; At the first moment Record the first actual pressure value ; S302, entering a detection phase with a detection duration of during which signals are continuously received and it is determined whether the current time is the end moment of the detection phase: ; wherein, represents a second moment; at the second moment , a second actual pressure value is recorded ; S303, calculating a pressure variation within the detection phase , the formula of which is: wherein, if the workpiece has no leakage, ; if leakage exists, , ; S304, based on the pressure variation , calculating the leakage amount per minute Q, the formula of which is: wherein, V is the volume of the workpiece to be tested, obtained through standard volume calibration before delivery; is the pressure drop rate; multiplied by for normalization, the pressure variation is converted into gas amount variation through V, divided by to eliminate the influence of initial pressure difference.
[0019] The specific process of controlling a display device to output a detection result is as follows: S401, obtaining the leakage amount per minute Q, and performing conformity judgment based on a leakage threshold as follows: if , the judgment result is qualified, indicating that the actually measured leakage amount does not exceed the allowable upper limit, and the sealing performance of the workpiece is qualified; if , the judgment result is unqualified, indicating that the actually measured leakage amount exceeds the allowable upper limit, and the workpiece has a leakage defect; S402, generating a detection result data packet based on the conformity judgment result, the content comprising a judgment conclusion, the leakage amount per minute Q, the leakage threshold , a zero reference value , a temperature during detection and a leakage detection pressure value , wherein the temperature during detection is retrieved from historical data of a temperature compensation unit is the temperature value at the moment; S403, Control the display device to output the test results; If the result is deemed unqualified, an audible and visual alarm signal will be triggered, and a control signal can be output to the production line actuator.
[0020] The output unit also specifically includes: Calculate the relative leakage rate It is used to assist in the assessment, and its formula is: Among them, relative leakage rate It is used to reflect the proportion of the current leakage to the maximum allowable leakage, so that users can judge the margin.
[0021] By receiving the detection parameters input by the user and acquiring the first real-time pressure value output by the pressure sensor, the exhaust solenoid valve is closed after the first real-time pressure value stabilizes at zero. The current pressure sensor reading is calibrated as the zero-point reference value. The real-time temperature value output by the temperature sensor and the second real-time pressure value output by the pressure sensor are acquired. The second real-time pressure value is zero-point calibrated according to the zero-point reference value. The second pressure value after zero-point calibration is temperature-compensated according to the real-time temperature value using a preset compensation algorithm to obtain the actual pressure value. The first actual pressure value at the first moment is recorded after the pressure stabilization phase, and the second actual pressure value at the second moment is recorded after the detection phase. The leakage rate per minute is calculated based on the detection time and compared with the leakage threshold. The detection result is judged as qualified, and the display device is controlled to output the detection result. By integrating the zero-point calibration unit and the temperature compensation unit into the same detection process in a data stream serial manner, the zero-point reference value directly participates in the zero-point calibration of the temperature compensation link. The compensated actual pressure value is input into the leakage detection unit, forming a complete collaborative data processing chain to eliminate the dual impact of zero-point drift and temperature change on detection accuracy, thereby achieving an overall improvement in the accuracy of the airtightness tester detection system.
[0022] The size of the interval and threshold is set to facilitate comparison. The size of the threshold depends on the amount of sample data and the number of bases set by those skilled in the art for each set of sample data; as long as it does not affect the ratio between the parameter and the quantized value.
[0023] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation. In the two embodiments provided in this application, it should be understood that the disclosed apparatus and system can be implemented in other ways; for example, the apparatus embodiments described above are merely illustrative, and the division of modules is merely a logical functional division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed; furthermore, 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 the apparatus or module may be electrical, mechanical or other forms. The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A method for dynamic temperature compensation and pressure calibration of an airtightness tester, characterized in that, It includes a data acquisition unit, a zero-point calibration unit, a temperature compensation unit, a leak detection unit, and a judgment output unit; The data acquisition unit is used to receive detection parameters input by the user, including leak detection pressure value, inflation time, pressure stabilization time, detection time and leakage threshold, and send the detection parameters to the zero-point calibration unit. The zero-point calibration unit is used to acquire detection parameters and collect the first real-time pressure value output by the pressure sensor. After the first real-time pressure value stabilizes at zero, the exhaust solenoid valve is closed, the current pressure sensor reading is calibrated as the zero-point reference value, and sent to the temperature compensation unit. The temperature compensation unit is used to obtain a zero-point reference value, and to collect the real-time temperature value output by the temperature sensor and the second real-time pressure value output by the pressure sensor. Based on the zero-point reference value, the second real-time pressure value is zero-point corrected, and based on the real-time temperature value, the zero-point corrected second pressure value is temperature-compensated according to a preset compensation algorithm to obtain the actual pressure value, which is then sent to the leakage detection unit. The leakage detection unit is used to obtain the actual pressure value, record the first actual pressure value at the first moment after the pressure stabilization phase ends, record the second actual pressure value at the second moment after the detection phase ends, calculate the leakage per minute based on the detection time, and send it to the judgment output unit. The judgment output unit is used to obtain the leakage amount per minute, compare it with the leakage threshold, judge the detection result as qualified, and control the display device to output the detection result.
2. The method for dynamic temperature compensation and pressure calibration of an airtightness tester according to claim 1, characterized in that, The specific process for calibrating the current pressure sensor reading to the zero-point reference value is as follows: S101. Obtain the leak detection pressure value. Inflation time stabilization time Detection time and leakage threshold Open the exhaust solenoid valve to connect the air passage to the atmosphere, and the system will begin to exhaust air. S102, with a fixed sampling period The first real-time pressure value output by the pressure sensor is continuously acquired. ,and ; S103, Judgment Does it satisfy the zero-value stability condition? - And it satisfies this condition N times consecutively, where, The preset stability threshold is N, and the preset number of times is N. S104. After the stability condition is met, close the exhaust solenoid valve to block the air path and cut off the connection between the air path and the atmosphere, and read the current output value of the pressure sensor and calibrate it as the zero-point reference value: .
3. The method for dynamic temperature compensation and pressure calibration of an airtightness tester according to claim 1, characterized in that, The specific process for obtaining the actual pressure value is as follows: S201. Obtain the zero-point reference value Open the charging solenoid valve and press the leak detection pressure value. Inflate the workpiece under test with air for a period of time. After inflation, the pressure stabilization phase begins, lasting for [duration]. During the period of fixed sampling Synchronously acquire real-time temperature values output by the temperature sensor and the second real-time pressure value output by the pressure sensor ; S202. After the voltage stabilization phase ends, the testing phase begins, and the testing time is... During this period, data collection continued synchronously. and ; S203. Perform zero-point correction by subtracting zero from the second real-time pressure value at each moment, and calculate the zero-point corrected pressure value. : in, This is the current raw reading from the pressure sensor; S204, Based on real-time temperature value Temperature compensation is performed according to a preset compensation algorithm, which uses a second-order polynomial model to calculate the actual pressure value. Its formula is: in, This is the first-order temperature compensation coefficient, obtained through multi-point temperature calibration fitting before leaving the factory; This is a second-order temperature compensation coefficient used to correct nonlinear temperature drift; This is the preset standard reference temperature.
4. The method for dynamic temperature compensation and pressure calibration of an airtightness tester according to claim 1, characterized in that, The specific process for calculating the leakage rate per minute based on the detection time is as follows: S301, Obtain the actual pressure value And determine whether the current time is the end of the voltage stabilization phase: ,in, Indicates the first moment; At the first moment Record the first actual pressure value ; S302. Entering the testing phase, the testing time is... During this period, it continued to receive And determine whether the current time is the end of the detection phase: ; in, Indicates the second moment; Second moment Record the second actual pressure value. ; S303. Calculate the pressure change during the detection phase. Its formula is: If the workpiece has no leakage, then ; If a leak exists, then , ; S304, Based on pressure change The formula for calculating the leakage rate Q per minute is: Wherein, V is the volume of the workpiece being measured, which is obtained through standard volume calibration before leaving the factory; The rate of pressure drop; Multiply Normalization is performed by converting the pressure change into a gas quantity change via V, and then dividing by... Eliminate the influence of differences in initial pressure.
5. The method for dynamic temperature compensation and pressure calibration of an airtightness tester according to claim 1, characterized in that, The specific process of controlling the display device to output the test results is as follows: S401. Obtain the leakage rate Q per minute, based on the leakage threshold. The qualification criteria are as follows: If , the determination result is qualified, indicating that the measured leakage does not exceed the allowable upper limit, and the workpiece sealing is qualified; like If the measured leakage exceeds the allowable limit, the result is deemed unqualified, indicating that the workpiece has a leakage defect. S402. Based on the pass / fail determination result, generate a test result data package, including the determination conclusion, leakage rate Q per minute, and leakage threshold. Zero-point reference value Temperature during testing and leak detection pressure value Among them, the temperature during detection Retrieve historical data from the temperature compensation unit Temperature value at any given time; S403, Control the display device to output the test results; If the result is deemed unqualified, an audible and visual alarm signal will be triggered, and a control signal can be output to the production line actuator.
6. The method for dynamic temperature compensation and pressure calibration of an airtightness tester according to claim 1, characterized in that, The determination output unit further includes: Calculate the relative leakage rate It is used to assist in the assessment, and its formula is: Among them, relative leakage rate It is used to reflect the proportion of the current leakage to the maximum allowable leakage, so that users can judge the margin.