CN114660241A - An online intelligent calibration system for ambient gas analyzers - Google Patents

Abstract

The invention discloses an on-line intelligent calibration system for an ambient gas analyzer, which relates to the field of instrument calibration. The on-site calibration system in the system comprises: a system control module and a gas standard substance holding device connected with the system control module, The standard gas dynamic preparation module and the gas circuit control module; the system control module is used to control the gas circuit control module to switch the working mode, control the standard gas dynamic preparation module to prepare standard gases of different concentrations, adjust the parameters of the ambient gas analyzer under school, adjust the The gas concentration indication value of the ambient air sample is corrected, the parameters of the linear regression curve are verified, and the stability of the ambient gas analyzer under test is verified. The invention realizes the automatic calibration of the ambient gas analyzer, and can improve the calibration efficiency and calibration accuracy of the ambient gas analyzer.

Description

An online intelligent calibration system for ambient gas analyzers

technical field

The invention relates to the field of instrument calibration, in particular to an online intelligent calibration system for an ambient gas analyzer.

Background technique

Gaseous pollutants are pollutants that exist in the molecular state under normal conditions and atmospheric pressure. Gaseous pollutants that have received widespread attention in environmental air pollution control include sulfur dioxide, nitrogen oxides, carbon monoxide and other gaseous organic compounds. The main purpose of the ambient gas analyzer is to analyze the content of gaseous pollutants in the ambient air in real time and accurately. During the use of the ambient gas analyzer, calibration is required at regular intervals to ensure the accuracy of the instrument's indicated value.

At present, the calibration of the ambient gas analyzer still adopts the traditional on-site manual operation method. The operation method is as follows: the standard gas of a certain gas and the zero point gas are mixed and prepared into the standard gas of the target concentration through the manual dilution device, and then connected through the pipeline. Enter the instrument to be calibrated, and judge the accuracy of the instrument's indication by comparing the difference between the instrument's indication and the standard gas preparation concentration. When the difference exceeds the quality control requirements, the instrument needs to be calibrated, that is, the instrument is manually adjusted according to the difference, so that the displayed value of the instrument is consistent with the concentration value of the standard gas preparation. Sometimes in the calibration process, in order to obtain the linearity of the instrument, it is also necessary to prepare standard gases of different concentrations for calibration measurement.

In the field of ambient gas detection, people pay attention to many gas components, such as SO ₂ , NO _x , CO and so on. The manual procedure described above is repeated for each gas composition analyzer calibration. And given the different stability of the instruments, in order to obtain accurate measurement results, the instruments need to be calibrated regularly, even frequently. Using traditional manual manual calibration is not only cumbersome, time-consuming, labor-intensive, untimely traceable, and unable to guarantee the authenticity and validity of data, but also requires manpower to be on duty regularly, and due to excessive manual operations, it is easy to introduce human errors , or even operational errors or data fraud. Therefore, the calibration efficiency and calibration accuracy of the existing ambient gas analyzers need to be improved.

SUMMARY OF THE INVENTION

Based on this, embodiments of the present invention provide an online intelligent calibration system for an ambient gas analyzer, so as to improve the calibration efficiency and calibration accuracy of the ambient gas analyzer.

For achieving the above object, the present invention provides the following scheme:

An online intelligent calibration system for an ambient gas analyzer, comprising: an on-site end calibration system; the on-site end calibration system includes: a system control module and a gas standard substance holding device connected to the system control module, a standard gas Dynamic configuration module and pneumatic control module;

The gas standard substance holding device is communicated with the standard gas dynamic preparation module; the standard gas dynamic preparation module is respectively communicated with the gas circuit control module and the zero gas source in the instrument system to be calibrated; the gas circuit control The modules are respectively communicated with the tested ambient gas analyzer in the tested instrument system and the sampling pipe in the tested instrument system;

The system control module is used for:

controlling the air circuit control module to switch working modes; the working modes include a calibration mode and a measurement mode;

Controlling the standard gas dynamic preparation module to dilute the gas standard substance conveyed by the gas standard substance holding device with the clean gas conveyed by the zero gas source to obtain standard gases of different concentrations;

In the calibration mode, control the gas circuit control module to input the clean gas or standard gas with different concentrations to the ambient gas analyzer under test, and obtain the gas concentration measured by the ambient gas analyzer under test display value, and adjust the parameters of the ambient gas analyzer under school according to the gas concentration display value and the corresponding standard value;

In the measurement mode, the air circuit control module is controlled to input the ambient air sample collected by the sampling pipe to the ambient gas analyzer under school, and the ambient air sample measured by the ambient gas analyzer under test is acquired. The gas concentration indication value of the air sample is corrected by the linear regression curve; The relationship between the corresponding gas concentration indication values measured by the ambient gas analyzer under school;

In the calibration mode, verify the parameters of the linear regression curve according to the set parameter control target;

In the calibration mode, the stability of the tested ambient gas analyzer is verified according to the relative standard deviation value and the set deviation control target; the relative standard deviation value is based on the analysis of the tested ambient gas It is determined by the clean gas in the instrument, the standard gas of different concentrations and the corresponding gas concentration indication measured by the ambient gas analyzer under test.

Optionally, the system control module includes:

Automatic zero-span calibration module for:

In the calibration mode, the gas circuit control module is controlled to input the clean gas to the ambient gas analyzer under test, and obtain the gas concentration indication value measured by the ambient gas analyzer under test, according to the The difference between the gas concentration indication and zero adjusts the zero-point parameter of the ambient gas analyzer under test;

In the calibration mode, the gas circuit control module is controlled to input standard gases of different concentrations to the ambient gas analyzer under test, and the gas concentration indication value measured by the ambient gas analyzer under test is obtained. The difference between the gas concentration indication value and the standard gas concentration value adjusts the span parameter of the ambient gas analyzer under school;

Automatic Indication Calibration Module for:

In the measurement mode, the gas circuit control module is controlled to input standard gases with different concentrations to the ambient gas analyzer under test, and the gas concentration indications measured by the ambient gas analyzer under test are obtained, which are determined by different concentrations. Make a linear regression curve between the concentration value of the standard gas concentration and the corresponding gas concentration indication value;

Control the gas circuit control module to switch the standard gas of different concentrations that pass into the ambient gas analyzer under school to the ambient air sample collected by the sampling tube, and obtain the ambient air sample measured by the ambient gas analyzer under school. The gas concentration indication value of the air sample, the linear regression curve is used to correct the gas concentration indication value of the ambient air sample;

Automatic linearity verification module for:

In the calibration mode, the gas circuit control module is controlled to input standard gases with different concentrations to the ambient gas analyzer under test, and the gas concentration indications measured by the ambient gas analyzer under test are obtained, which are determined by different concentrations. The concentration value of the standard gas of concentration and the corresponding gas concentration indication value make a linear regression curve, and determine the parameters of the linear regression curve; the parameters include intercept, slope and linear coefficient;

Compare the parameter with the set parameter control target to realize the verification of the parameter;

Automatic stability verification module for:

In the calibration mode, data collection operations are performed multiple times to obtain the gas concentration indications of standard gases with different concentrations measured by the ambient gas analyzer under test, and calculate the gas concentration indications based on the gas concentration indications of standard gases with different concentrations Relative standard deviation value, comparing the relative standard deviation value with the set deviation control target to verify the stability of the ambient gas analyzer under school;

Wherein, the data collection operation is:

Control the gas circuit control module to input the clean gas to the ambient gas analyzer under test, and obtain the gas concentration indication value measured by the ambient gas analyzer under test; when the difference between the gas concentration indication value and zero When the value is less than or equal to the set value, control the gas circuit control module to switch the clean gas flowing into the tested ambient gas analyzer to the standard gas of the set concentration, and obtain the tested ambient gas analysis The gas concentration indication of the standard gas of the set concentration measured by the instrument.

Optionally, the online intelligent calibration system for the ambient gas analyzer further includes on-site monitoring accessories;

The on-site monitoring accessory is connected to the system control module; the on-site monitoring accessory is used to obtain real-time on-site information; the real-time on-site information includes the temperature of the sampling pipe, the flow rate of the sampling pipe, and the inside of the gas standard substance holding device. pressure, whether there is leakage in the gas standard material holding device, the image of the desiccant in the calibrated instrument system, the image of the monitoring environment, the temperature of the monitoring environment, the humidity of the monitoring environment, and the atmospheric pressure of the monitoring environment;

The system control module is further configured to monitor the gas standard substance holding device, the calibrated instrument system and the monitoring environment according to the real-time on-site information, and obtain monitoring results.

Optionally, the online intelligent calibration system for the ambient gas analyzer further includes: a data center;

The data center is connected to the system control module; the data center is configured to receive calibration results and monitoring results sent by the system control module, and issue alarm information according to the calibration results and the monitoring results.

Optionally, the online intelligent calibration system for the ambient gas analyzer further includes: a user terminal display system;

The client display system is connected to the data center; the client display system is used to display the alarm information.

Optionally, the standard gas dynamic preparation module includes: a preparation gas pipeline, a pressure regulating valve, a first gas mass flow controller, a second gas mass flow controller and a control unit;

The preparation gas pipeline is used for connecting the gas standard substance holding device and the gas circuit control module; the pressure regulating valve is arranged on the preparation gas pipeline; the pressure regulating valve is used for regulating the gas The standard substance is depressurized to obtain a depressurized gas standard substance; the first gas mass flow controller is used to control the flow rate of the depressurized gas standard substance passed into the preparation gas pipeline; the second gas mass flow controller The gas mass flow controller is used to control the flow rate of the clean gas introduced into the preparation gas pipeline; the control unit is respectively connected with the first gas mass flow controller, the second gas mass flow controller and the The system control module is connected; the control unit is used to select a preparation mode; the preparation mode includes manual preparation and automatic matching.

Optionally, the gas circuit control module includes: a first control gas pipeline, a second control gas pipeline, a first solenoid valve, a second solenoid valve, and a programmable logic controller;

The standard gas dynamic preparation module is communicated with the tested ambient gas analyzer through the first control gas pipeline; the standard gas dynamic preparation module is communicated with the sampling pipe through the second control gas pipeline; The programmable logic controller is respectively connected with the first solenoid valve, the second solenoid valve and the system control module; the programmable logic controller is used to control the first solenoid valve and the second solenoid valve The switch state of the solenoid valve; the first solenoid valve is used to control the on-off of the first control gas pipeline; the second solenoid valve is used to control the on-off of the second control gas pipeline.

Optionally, the on-site monitoring accessories include:

Sampling tube temperature sensor, sampling tube flow sensor, gas pressure sensor, gas leakage sensor, desiccant image sensor, instrument image sensor, indoor temperature sensor, indoor humidity sensor and indoor atmospheric pressure sensor;

The sampling tube temperature sensor is used to collect the temperature of the sampling tube; the sampling tube flow sensor is used to collect the flow rate of the sampling tube; the gas pressure sensor is used to collect the pressure in the gas standard substance holding device; the gas leakage The sensor is used to determine whether there is a leak in the gas standard substance holding device; the desiccant image sensor is used to acquire the image of the desiccant in the instrument system to be calibrated; the instrument image sensor is used to acquire the image of the monitoring environment; the indoor temperature The sensor is used to obtain the temperature of the monitoring environment; the indoor humidity sensor is used to obtain the humidity of the monitoring environment; the indoor atmospheric pressure sensor is used to obtain the atmospheric pressure of the monitoring environment.

Optionally, the system control module is further configured to calculate the temperature difference between the temperature of the monitoring environment and the target temperature, and adjust the temperature of the environment where the ambient gas analyzer under school is located according to the temperature difference.

Optionally, the system control module further includes: an on-site operation interface;

The field terminal operation interface is used to set monitoring parameters; the monitoring parameters include calibration parameters and state control target parameters.

Compared with the prior art, the beneficial effects of the present invention are:

The embodiment of the present invention proposes an online intelligent calibration system for an ambient gas analyzer. The on-site calibration system in the system includes: a system control module, a gas standard substance holding device connected to the system control module, a standard gas dynamic The preparation module and the gas circuit control module; the gas standard substance holding device is communicated with the standard gas dynamic preparation module; the standard gas dynamic preparation module is respectively communicated with the gas circuit control module and the zero gas source in the instrument system to be calibrated; the gas circuit control module is respectively connected with The calibrated ambient gas analyzer in the calibrated instrument system is connected with the sampling pipe in the calibrated instrument system; the system control module controls the standard gas dynamic preparation module to prepare standard gases of different concentrations, and realizes the adjustment of the parameters of the calibrated ambient gas analyzer. Adjust, realize the correction of the gas concentration indication value of the ambient air sample, realize the verification of the parameters of the linear regression curve, and realize the verification of the stability of the ambient gas analyzer to be calibrated. Calibration can improve the calibration efficiency and calibration accuracy of the ambient gas analyzer.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

FIG. 1 is a structural diagram of an online intelligent calibration system for an ambient gas analyzer provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

At present, the National Ambient Air Quality Monitoring Network has built more than 5,000 monitoring sites, and some sites are far away from the urban area and have inconvenient traffic. At present, the commonly used manual calibration frequency is to perform zero-span calibration once a week and linear calibration once every six months. When manual calibration is performed, a large number of operation and maintenance personnel need to be invested in order to meet the calibration requirements, thus greatly increasing the operation and maintenance cost. If automatic calibration is used, it can not only increase the calibration frequency, but also reduce the number of operation and maintenance personnel, thereby greatly reducing the number of operation and maintenance personnel. Operation and maintenance costs. Moreover, in related technical standards, such as "HJ 818-2018 Operation and Quality Control Specifications for Continuous Automatic Monitoring System of Ambient Air Gaseous Pollutants (SO ₂ , NO ₂ , O ₃ , CO)", it is recommended to increase the calibration frequency to once a day. The calibration method is difficult to complete when operating a large number of monitoring sites. Based on this, this embodiment provides an online intelligent calibration system for an ambient gas analyzer capable of real-time sampling and automatic intelligent calibration.

Referring to FIG. 1 , the online intelligent calibration system for ambient gas analyzers in this embodiment includes: an on-site calibration system; the on-site calibration system includes: a system control module and a gas standard substance connected to the system control module Containing device, standard gas dynamic preparation module and gas circuit control module.

The gas standard substance holding device is communicated with the standard gas dynamic preparation module; the standard gas dynamic preparation module is respectively communicated with the gas circuit control module and the zero gas source in the instrument system to be calibrated; the gas circuit control The modules are respectively communicated with the tested ambient gas analyzer (the tested instrument) in the tested instrument system and the sampling pipe in the tested tested instrument system.

The system control module is used for:

controlling the air circuit control module to switch working modes; the working modes include a calibration mode and a measurement mode;

Controlling the standard gas dynamic preparation module to dilute the gas standard substance conveyed by the gas standard substance holding device with the clean gas conveyed by the zero gas source to obtain standard gases of different concentrations;

In the calibration mode, control the gas circuit control module to input the clean gas or standard gas with different concentrations to the ambient gas analyzer under test, and obtain the gas concentration measured by the ambient gas analyzer under test display value, and adjust the parameters of the ambient gas analyzer under school according to the gas concentration display value and the corresponding standard value;

In the measurement mode, the air circuit control module is controlled to input the ambient air sample collected by the sampling pipe to the ambient gas analyzer under school, and the ambient air sample measured by the ambient gas analyzer under test is acquired. The gas concentration indication value of the air sample is corrected by the linear regression curve; The relationship between the corresponding gas concentration indication values measured by the ambient gas analyzer under school;

In the calibration mode, verify the parameters of the linear regression curve according to the set parameter control target;

In the calibration mode, the stability of the tested ambient gas analyzer is verified according to the relative standard deviation value and the set deviation control target; the relative standard deviation value is based on the analysis of the tested ambient gas It is determined by the clean gas in the instrument, the standard gas of different concentrations and the corresponding gas concentration indication measured by the ambient gas analyzer under test.

In one example, the calibrated instrument system generally includes: a calibrated ambient gas analyzer for measuring the concentration of gaseous pollutants in the ambient air; a sampling pipe for conducting the outdoor ambient air sample to the subject through the pipe In the school ambient gas analyzer; zero gas source, used to generate clean gas without gaseous pollutant impurities; desiccant, equipped for some of the school ambient gas analyzers (such as chemiluminescence nitrogen oxide analyzer), It is used to remove the moisture in the air and prevent the indoor air containing too much moisture from entering the calibrated instrument. The instrument system to be calibrated is usually placed indoors. In order to keep the instrument to be calibrated at a normal working temperature, an air conditioner is usually installed in the room, which can cool and heat, and adjust the indoor temperature so that it is at the normal working temperature of the ambient gas analyzer to be calibrated. within the range.

In one example, the gas standard substance holding device includes a gas cylinder cabinet and a gas cylinder placed in the gas cylinder cabinet; the gas standard substance is placed in the gas cylinder. The gas standard material holding device and the calibrated instrument system are stored at the indoor calibration site synchronously, which is the source of the traceability of the calibrated ambient gas analyzer. The gas cylinder containing the gas standard substance is placed in the gas cylinder cabinet, and is connected to the standard gas dynamic preparation module through the gas pipeline.

In one example, the standard gas dynamic formulation module includes: a formulation gas pipeline, a pressure regulating valve, a first gas mass flow controller, a second gas mass flow controller, and a control unit.

The preparation gas pipeline is used for connecting the gas standard substance holding device and the gas circuit control module, and connecting the zero gas source and the gas circuit control module. The pressure regulating valve is arranged on the preparation gas pipeline; the pressure regulating valve is used to depressurize the high-pressure gas of the gas standard substance in the bottle to obtain a depressurized gas standard substance, that is, a relatively low gas standard substance. The pressure is then connected to the first gas mass flow controller through the gas pipeline. The gas mass flow controller mainly mixes the depressurized gas standard substance (high concentration) with the dilution gas from the zero gas source, dilutes it into a low concentration standard gas, and then outputs it to the gas circuit through the gas pipeline. A control module, wherein the first gas mass flow controller is used to control the flow rate of the depressurized gas standard substance passed into the preparation gas pipeline; Describe the flow rate of clean gas in the preparation gas pipeline. The control unit is respectively connected with the first gas mass flow controller, the second gas mass flow controller and the system control module through a data line; the control unit is used to select automatic matching or manual matching to control the above Gas dilution process, display of gas flow rate in gas mass flow controller and display of diluted standard gas concentration.

In one example, the gas circuit control module includes: a first control gas line, a second control gas line, a first solenoid valve, a second solenoid valve, and a programmable logic controller.

The standard gas dynamic preparation module is communicated with the tested ambient gas analyzer through the first control gas pipeline; the standard gas dynamic preparation module is communicated with the sampling pipe through the second control gas pipeline; The programmable logic controller is respectively connected with the first solenoid valve, the second solenoid valve and the system control module; the programmable logic controller is used to control the first solenoid valve and the second solenoid valve The switch state of the solenoid valve; the first solenoid valve is used to control the on-off of the first control gas pipeline; the second solenoid valve is used to control the on-off of the second control gas pipeline. The programmable logic controller can output the low-concentration standard gas flowing out of the standard gas dynamic preparation module to the ambient gas analyzer under test, and switch the sampling mode, that is, switch the ambient air sample to the standard gas, and enter the calibration work. mode, or switch from standard gas to ambient air sample, enter the measurement working mode, so as to realize online traceability.

In one example, in order to monitor the monitoring environment in which the gas standard material holding device, the instrument system to be calibrated, and the on-site calibration system are located, the online intelligent calibration system for ambient gas analyzers is also provided with on-site monitoring accessories; the on-site monitoring accessories are connected to the system control module; the on-site monitoring accessories are used to obtain real-time on-site information; the real-time on-site information includes the temperature of the sampling pipe, the flow rate of the sampling pipe, the gas standard material content The pressure in the storage device, whether there is leakage in the gas standard material storage device, the image of the desiccant in the instrument system to be calibrated, the image of the monitoring environment, the temperature of the monitoring environment, the humidity of the monitoring environment, and the atmospheric pressure of the monitoring environment. The system control module is further configured to monitor the gas standard substance holding device, the calibrated instrument system and the monitoring environment according to the real-time on-site information, and obtain monitoring results. The system control module is further configured to calculate the temperature difference between the temperature of the monitoring environment and the target temperature, and adjust the temperature of the environment where the ambient gas analyzer under test is located according to the temperature difference.

In practical applications, the on-site monitoring accessories include:

Sampling tube temperature sensor A, sampling tube flow sensor B, gas pressure sensor C, gas leakage sensor D, desiccant image sensor F, instrument image sensor E, indoor temperature sensor G, indoor humidity sensor H and indoor atmospheric pressure sensor I. Room temperature sensor, room humidity sensor and room atmospheric pressure sensor can also be integrated into one sensor device.

The sampling pipe temperature sensor A is located on the pipe wall in the middle of the sampling pipe, and is used to monitor the temperature (heat tracing temperature) of the ambient air sampling pipe, and issue an alarm message when abnormal temperature is found.

The sampling tube flow sensor B is located at the end of the sampling tube and is used to monitor the flow of the measured ambient air sample in the ambient air sampling tube, and issue an alarm message when abnormal flow is found.

The gas pressure sensor C is located on the gas pipeline between the gas cylinder outlet containing the gas standard substance and the standard gas dynamic preparation module, and is used to collect the pressure in the gas standard substance holding device (specifically, monitoring the gas standard The gas pressure in the gas bottle of the material), when the pressure is too low, an alarm message will be issued.

The gas leak sensor D is located inside the gas cylinder cabinet, and is used to determine whether there is a leak in the gas standard substance holding device (specifically, monitor whether there is a leak in the gas cylinder containing the gas standard substance), and issue an alarm when a gas leak is found information.

The desiccant image sensor F is at a distance from the desiccant equipped with the ambient gas analyzer to be calibrated. The lens is facing the desiccant tube to obtain an image of the desiccant. Based on image recognition technology, it is used to monitor the drying of the gas carried by the calibrated instrument. The discoloration of the desiccant can be judged to judge its use status, and an alarm message will be issued when the desiccant is found to change from blue to pink.

The instrument image sensor E is located at a certain height in the room where the instrument system to be calibrated is located, and the lens is facing the instrument system to be calibrated and the on-site calibration system to obtain images of the monitoring environment. Based on image recognition technology, it is used to monitor the environment to be calibrated. The appearance status of the gas analyzer and the on-site calibration system, as well as the monitoring environment (calibration of the on-site environment), and an alarm message is issued when abnormal conditions are found.

The indoor temperature sensor G is located near the instrument system to be calibrated, and is used to obtain the temperature of the monitoring environment, that is, the temperature of the indoor environment where the ambient gas analyzer to be calibrated is located, and to issue an alarm message when abnormal temperature is found.

The indoor humidity sensor H is located near the instrument system to be calibrated, and is used to obtain the humidity of the monitoring environment, that is, the humidity of the indoor environment where the ambient gas analyzer to be calibrated is located, and to issue an alarm message when abnormal humidity is found.

The indoor atmospheric pressure sensor 1 is located near the instrument system under school, and is used to obtain the atmospheric pressure of the monitoring environment, that is, the atmospheric pressure of the indoor environment where the ambient gas analyzer under school is located, and sends out an alarm message when abnormal atmospheric pressure is found.

In one example, the system control module includes:

Automatic zero-span calibration module with built-in zero-span calibration routine for:

In the calibration mode, the gas circuit control module is controlled to input the clean gas to the ambient gas analyzer under test, and obtain the gas concentration indication value measured by the ambient gas analyzer under test, according to the The difference between the gas concentration indication and zero adjusts the zero-point parameter of the ambient gas analyzer under test;

In the calibration mode, the gas circuit control module is controlled to input standard gases of different concentrations to the ambient gas analyzer under test, and the gas concentration indication value measured by the ambient gas analyzer under test is obtained. The difference between the gas concentration indication value and the standard gas concentration value adjusts the span parameter of the ambient gas analyzer under school;

Automatic value calibration module, with built-in automatic value calibration program, used for:

In the measurement mode, the gas circuit control module is controlled to input standard gases with different concentrations to the ambient gas analyzer under test, and the gas concentration indications measured by the ambient gas analyzer under test are obtained, which are determined by different concentrations. Make a linear regression curve between the concentration value of the standard gas concentration and the corresponding gas concentration indication value;

Control the gas circuit control module to switch the standard gas of different concentrations that pass into the ambient gas analyzer under school to the ambient air sample collected by the sampling tube, and obtain the ambient air sample measured by the ambient gas analyzer under school. The gas concentration indication value of the air sample, the linear regression curve is used to correct the gas concentration indication value of the ambient air sample;

Automatic linearity verification module, built-in automatic linearity verification program, used for:

In the calibration mode, the gas circuit control module is controlled to input standard gases with different concentrations to the ambient gas analyzer under test, and the gas concentration indications measured by the ambient gas analyzer under test are obtained, which are determined by different concentrations. The concentration value of the standard gas of concentration and the corresponding gas concentration indication value make a linear regression curve, and determine the parameters of the linear regression curve; the parameters include intercept, slope and linear coefficient;

Compare the parameter with the set parameter control target to realize the verification of the parameter;

Automatic stability verification module, built-in automatic stability verification program, used for:

In the calibration mode, data collection operations are performed multiple times to obtain the gas concentration indications of standard gases with different concentrations measured by the ambient gas analyzer under test, and calculate the gas concentration indications based on the gas concentration indications of standard gases with different concentrations Relative standard deviation value, comparing the relative standard deviation value with the set deviation control target to verify the stability of the ambient gas analyzer under school;

Wherein, the data collection operation is:

Control the gas circuit control module to input the clean gas to the ambient gas analyzer under test, and obtain the gas concentration indication value measured by the ambient gas analyzer under test; when the difference between the gas concentration indication value and zero When the value is less than or equal to the set value, control the gas circuit control module to switch the clean gas flowing into the tested ambient gas analyzer to the standard gas of the set concentration, and obtain the tested ambient gas analysis The gas concentration indication of the standard gas of the set concentration measured by the instrument.

In one example, the system control module further includes: a field-side operation interface;

The field terminal operation interface is used to set monitoring parameters; the monitoring parameters include calibration parameters and state control target parameters.

In one example, the system control module includes an industrial control computer, a display, a keyboard and mouse, a switch, etc., and is the core for realizing automatic calibration. The industrial control computer has built-in automatic zero-span calibration module, automatic indication calibration module, automatic linearity verification module and automatic stability verification module. There is a field terminal operation interface in the display. The system control module is connected to the data center through the Internet to realize data transmission; it is connected to the standard gas dynamic preparation module, the gas circuit control module, the sampling tube temperature sensor A, the sampling tube flow sensor B, the gas pressure sensor C, and the gas leakage sensor through the serial port data cable. D. The instrument image sensor E, the desiccant image sensor F, the indoor temperature sensor G, the indoor humidity sensor H and the indoor atmospheric pressure sensor I are connected to realize data transmission; communicate with multiple instruments to be calibrated at the same time through the network cable, and the instruments can be read in real time Display value and reverse control the instrument, and monitor the gas flow and pressure, internal current, voltage and temperature inside the instrument, as well as the internal alarm of the instrument in real time; realize the control of the on-site indoor air conditioner through wireless transmission or data line.

In one example, the online intelligent calibration system for the ambient gas analyzer further includes: a data center and a client display system.

The data center is connected to the system control module; the data center is configured to receive calibration results and monitoring results sent by the system control module, and issue alarm information according to the calibration results and the monitoring results. The data center is connected to the on-site calibration system and the user-end display system through the Internet to realize data transmission. The data center can rely on the actual large-scale computer server system or cloud server system. The data center can collect, organize and save the data, information and video images of the calibrated instruments and calibration sites, set control objectives and calibration procedures, and form records, results or reports in a preset manner. When the standard gas, the instrument to be calibrated, the sampling pipeline and its surrounding environment are abnormal in the daily operation or the data is out of tolerance during the calibration process, the data center will send an alarm or maintenance notification to the user in real time to remind them to maintain in time.

The client display system is connected to the data center; the client display system is used to display the alarm information. The user terminal display system includes computer display equipment and mobile phone display equipment. The user terminal logs in to the data center through the computer display equipment to obtain the calibration records, results and reports of the instruments being calibrated, as well as real-time video images, alarms or maintenance notices of the instruments being calibrated and the surrounding environment. ; You can also view the above information through the mobile phone display device, which also has the function of alarm or maintenance notification SMS reminder.

The online intelligent calibration system for the ambient gas analyzer of this embodiment will be further described in detail below.

From the software point of view, the software part of the online intelligent calibration system of ambient gas analyzer includes: intelligent calibration part, state monitoring part and data management part. The intelligent calibration part is used to control the on-site calibration system to calibrate the instrument to be calibrated. The standard gas of the target concentration is intelligently prepared through the standard gas dynamic preparation module and passed into the instrument to be calibrated; it has zero-span calibration procedures and indication calibration procedures. , linearity verification program, stability verification program and other programs; these programs can be used alone or in combination; they have data statistics, analysis, calculation and judgment functions, and can feedback correction instructions to the instrument to be calibrated. The calibration frequency can be set to once a week, once a few days or once a day according to work needs, so as to achieve high-frequency calibration. The starting time of the calibration program can be freely set according to the work needs, which can be started by itself at night or by itself during the day. You can choose automatic calibration or manual calibration. When automatic calibration is selected, the calibration program starts automatically according to the designed calibration frequency and startup time; when manual calibration is selected, the staff can control the field-side calibration system on-site for calibration. operate.

Among them, the realization method of intelligently preparing standard gas of target concentration through the standard gas dynamic preparation module is as follows: according to the nominal concentration value of the bottled gas standard substance, the full scale of the instrument to be calibrated and the concentration point to be calibrated (for example, 10% of the full scale) , 80% full scale, etc.), automatically calculate the target concentration of the standard gas dynamic preparation, and automatically adjust the two gas mass flow controllers in the standard gas dynamic preparation module according to the target concentration and the set standard gas total flow. Flow output value, the first gas mass flow controller controls the flow rate of the bottled gas standard material, and the second gas mass flow controller controls the flow rate of the dilution gas from the zero gas source, thereby diluting the high concentration bottled gas standard material to the target concentration standard gas. If there is more than one characteristic component in the bottled gas standard material, but multiple characteristic components, first select and lock one characteristic component, dilute it to the target concentration, and divide the target concentration by the amount of the component in the bottled gas standard material. The nominal concentration value calculates a dilution factor. The diluted concentration of other characteristic components in the bottled gas standard material is calculated by multiplying the nominal concentration value of other characteristic components in the bottled gas standard material by the dilution factor.

After the automatic calibration process is started, the system control module of the on-site calibration system sends a gas distribution command to the standard gas dynamic preparation module, and the standard gas dynamic preparation module automatically dilutes the high-concentration gas standard substance according to the received gas distribution command and outputs low Concentration standard gas; send the gas circuit switching command to the gas circuit control module, and the gas circuit control module opens and closes the corresponding solenoid valve after receiving the gas circuit switching command to input the low-concentration standard gas into the instrument under test; the system control module real-time Obtain the indication value of the standard gas measured by the instrument from the calibrated instrument, analyze and judge the indication value, and choose whether to process or adjust the calibrated instrument according to the judgment result.

Among them, the implementation of the automatic zero-span calibration procedure is as follows: at a preset time point or after the end of the previous calibration procedure, the system automatically starts the calibration procedure, and the dilution gas from the zero gas source is passed through the standard gas dynamic preparation module. The calibrated instrument automatically controls the gas flow, collects the original signal indication value of the calibrated instrument in real time, and automatically compares the difference between the instrument signal indication value (that is, the gas concentration indication value) and "0" when the calibrated instrument indication value is stable. Obtain the difference between the gas concentration indication and "0", and automatically set the difference to the zero calibration control target (for example, for NO and SO ₂ gas components, set the zero calibration control target to be the gas concentration indication The difference between the value and "0" does not exceed ±10nmol/mol. For CO gas components, the set zero calibration control target is that the difference between the gas concentration indication and "0" does not exceed ±1μmol/mol). Whether the difference is significant or not, when the difference is significant (the difference does not meet the set zero calibration control target), the feedback correction command is automatically sent to the instrument to be calibrated, and the zero parameter of the instrument to be calibrated is adjusted according to the difference. When the difference is not significant (The difference satisfies the set zero calibration control target), no feedback correction is performed. Then according to the program setting, the bottled gas standard material is automatically prepared into the standard gas at the concentration point (such as 80% of the span) used for the span calibration of the calibrated instrument through the standard gas dynamic preparation module, and then passed into the calibrated instrument to automatically control the gas flow. Collect the original signal indication value of the calibrated instrument in real time, when the calibrated instrument indication value is stable, automatically compare the difference between the instrument signal indication value (gas concentration indication value) and the concentration value of the standard gas at this time, and obtain the gas concentration indication value and the standard gas concentration value. The difference value of the gas concentration value, the difference value and the set span calibration control target are automatically set (for example: for NO, SO ₂ and CO three gas components, the set span calibration control target is the gas concentration indication value and the standard The difference of the concentration value of the gas does not exceed ±5% of the concentration value of the standard gas) to compare and judge whether the difference is significant or not. When the difference is significant (the difference does not meet the set span calibration control target), it will automatically send a feedback correction command to the receiver. When the difference is not significant (the difference meets the set span calibration control target), no feedback correction is performed. If the span parameter is adjusted, the system automatically repeats the zero-span calibration procedure, and automatically judges again whether the indication difference during zero calibration meets the set zero calibration control target and whether the indication difference during span calibration meets the set span calibration control target , if all are satisfied, end the zero-span calibration procedure, and submit all calibration records to the data center; if not, perform feedback correction adjustment and repeat the zero-span calibration procedure. If the zero-span calibration procedure is repeated many times, and the set zero-span calibration control target and the set span calibration control target cannot be met at the same time, end the calibration procedure, and report the information of "zero-span calibration out of tolerance" and all calibration records to the data center , the data center will send the alarm or maintenance notification to the client display system.

Among them, the realization of the automatic indication calibration procedure is as follows: at a preset time point or after the end of the previous calibration procedure, the system automatically starts the calibration procedure, and according to the procedure setting, the bottled gas standard material is automatically prepared through the standard gas dynamic preparation module Prepare standard gas with different concentration points (such as: 0, 10%, 20%, 40%, 60% and 80% of the range point), pass it into the calibrated instrument, automatically control the gas flow, and collect the original data of the calibrated instrument in real time. Signal indication value, when the calibrated instrument indication value is stable, the original signal indication value of the instrument and the standard gas concentration value are automatically recorded, and the standard gas concentration value at different concentration points and the corresponding instrument original signal indication value are drawn into a linear regression curve and saved. Parameters of this regression curve (eg intercept, slope, and linearity coefficients). The on-site calibration system automatically switches the sampling mode through the gas circuit control module, from the standard gas to the ambient air sample, introduces the measured actual ambient air sample into the instrument to be calibrated, and collects the original signal indication value of the instrument to be calibrated in real time. , and automatically calculate the true concentration value of the tested ambient air sample according to the most recent regression curve parameters, and submit all calibration records to the data center.

Among them, the realization of the automatic linearity verification program is as follows: at a preset time point or after the end of the previous calibration program, the system automatically starts the calibration program, and according to the program settings, the bottled gas standard material is automatically prepared through the standard gas dynamic preparation module. Prepare standard gas with different concentration points (such as: 0, 10%, 20%, 40%, 60% and 80% of the range point), pass it into the calibrated instrument, automatically control the gas flow, and collect the original data of the calibrated instrument in real time. Signal indication value, when the calibrated instrument indication value is stable, the original signal indication value of the instrument and the standard gas concentration value are automatically recorded, and the standard gas concentration value at different concentration points and the original signal indication value of the corresponding instrument are used to make a linear regression curve and save. parameters of the regression curve (eg intercept, slope, linear coefficient), and the program ends. The system automatically judges whether the obtained parameters such as intercept, slope and linear coefficient are significant compared with the set parameter control target (intercept within ±1% of full scale, 0.95≤slope≤1.05, linear coefficient>0.999). difference. If the difference is significant (parameters do not meet the set parameter control objectives), the information of "linearity verification out of tolerance" and all verification records will be reported to the data center, and the data center will send an alarm or maintenance notification to the client display system; If it is not significant (parameters meet the set parameter control objectives), then submit all verification records to the data center.

Among them, the implementation of the automatic stability verification program is as follows: at a preset time point or after the end of the previous calibration program, the system automatically starts the calibration program, and according to the program settings, the standard gas dynamic preparation module will be from the zero gas source. The dilution gas is fed into the instrument to be calibrated, the flow of the gas is automatically controlled, and the original signal indication value of the instrument to be calibrated is collected in real time. The gas dynamic preparation module automatically prepares the standard gas of bottled gas into a standard gas of a certain concentration point (such as: 20% of the range point), passes it into the calibrated instrument, automatically controls the gas flow, and collects the original signal indication value of the calibrated instrument in real time. , when the calibrated instrument indication is stable, the original signal indication of the instrument is automatically recorded. Repeat the cycle of feeding zero gas and standard gas many times to obtain multiple original signal indication data, and end the program. The system automatically performs statistical analysis on these data to obtain the relative standard deviation value, and the system automatically determines whether the relative standard deviation value obtained is significantly compared with the set deviation control target (for example: the relative standard deviation value of the instrument display value ≤ 5%). sexual differences. If the difference is significant (the relative standard deviation value does not meet the set deviation control target), report the information of "stability verification out of tolerance" and all verification records to the data center, and the data center will send an alarm or maintenance notification to the client display system ; If the difference is not significant (the relative standard deviation value meets the set deviation control target), submit all verification records to the data center. If the indication value of the instrument to be calibrated is unstable when the dilution gas from the zero gas source is introduced during the execution of the program, or the difference from "0" is greater than a preset value although it is stable, stop the program and report Send the information of "stability verification out of tolerance" and all verification records to the data center, and the data center will send an alarm or maintenance notification to the client display system.

The state monitoring part realizes all-round monitoring of the instrument under test and calibration system through the on-site monitoring accessories and system control module: real-time monitoring of the standard gas state, such as gas pressure in the bottle, gas leakage, gas flow, and the monitoring value and the corresponding. Data quality control objectives (such as: the gas pressure in the gas cylinder is not less than 1MPa, the gas concentration is less than the set alarm threshold of the sensor, the difference between the gas flow measurement value and the set gas flow value is less than 1% of the set gas flow value) Compare; monitor the key parameters of the instrument being calibrated in real time, such as gas flow and pressure inside the instrument, internal current, voltage and temperature, alarm information, etc., and compare the monitored value with the corresponding data quality control target (given by the instrument manufacturer) Compare; real-time monitoring of ambient air sampling pipes, such as the sampling pipe heat tracing temperature, the flow rate of the measured ambient air samples in the sampling pipe, and the monitoring value and the corresponding data quality control target (for example: the temperature control target is the set temperature value. ±5°C, the flow control target is 20% of the set flow value); real-time video monitors the condition of the desiccant of the calibrated instrument, the appearance state of the calibrated instrument and the on-site calibration system, and the calibration site environment, and converts the image The recognition result is compared with the normal image; the indoor temperature, humidity, and atmospheric pressure are monitored in real time, and the monitoring value is compared with the corresponding data quality control target (for example: the temperature control target is ±2°C of the set temperature value, and the humidity control target is the set temperature value. It can be compared with ±20% HR) of the constant humidity value, and the temperature of the indoor air conditioner can be regulated. All monitoring data, records and video images are sent to the data center in real time through the system control module. When it is found that the monitored data exceeds the corresponding data quality control target requirements or the image recognition results are significantly different from normal images, the real-time The alarm information is sent to the data center, and the data center will send the alarm or maintenance notification to the client display system.

When the monitored indoor temperature exceeds the set control target parameter range, the system control module of the on-site calibration system automatically calculates the temperature difference, and sends a temperature adjustment command to the heating and cooling air conditioner according to the temperature difference to adjust the temperature of the indoor environment where the calibrated instrument is located. Keep it within the temperature range for the normal operation of the instrument being calibrated. If the indoor temperature still exceeds the set control target range after adjustment, the on-site calibration system will automatically record the information, and send the alarm information to the data center in real time, and the data center will send the alarm or maintenance notification to the user-end display system .

The data management part includes data and image acquisition, storage, analysis, processing and the setting of monitoring parameters. The on-site calibration system acquires data including calibration records, calibration results, out-of-tolerance information, status monitoring, and image information, which is stored on the site and sent to the data center in real time; the data center saves all the data sent by the on-site calibration system and image information. The data and image information saved by the on-site calibration system are updated cyclically on a weekly, monthly or annual basis; the data center permanently saves the obtained data and image information. The on-site calibration system analyzes and judges whether the calibration results are out of tolerance and whether the monitoring parameters exceed the control target. When the calibrated instrument needs to be corrected according to the calibration procedure, the on-site calibration system automatically sends a correction feedback command to the calibrated device, and the calibrated device automatically adjusts the relevant parameters according to the command to realize the correction. The data center saves and analyzes all the data and image information sent by the on-site calibration system, and sends alarm or maintenance information to the user-end display system in real time in the form of text messages for out-of-tolerance and out-of-target situations, prompting users to maintain in time.

Among them, the monitoring parameter setting can be completed by logging into the field-side operation interface through the on-site calibration system, or by logging into the data center through the user-end display system, which is completed by the data center, and the two are synchronized in real time. The center setting shall prevail. The settings of monitoring parameters include: calibration parameters and state control target parameters.

Calibration parameters, such as the nominal concentration value of the bottled gas standard material, the total flow of the standard gas prepared by the standard gas dynamic preparation module, the selection of the calibration program, the concentration point to be calibrated, the data quality control target in the calibration (set the zero point calibration) Control target, set span calibration control target, set parameter control target, set deviation control target), calibration program start time, calibration program cycle times, etc.

Status control target parameters, such as the minimum pressure of the gas pressure in the bottle of the bottled gas standard material, whether the gas leak alarm sends an alarm signal, the temperature range of the ambient air sampling pipe heat tracing, the flow rate of the ambient air sample to be measured in the ambient air sampling pipe Scope, the range of the indoor ambient temperature of the instrument to be calibrated, the gas flow and pressure inside the instrument to be calibrated, the normal working range of internal current, voltage and temperature, the desiccant of the instrument to be calibrated monitored by real-time video, the instrument to be calibrated and the on-site terminal mark The difference between the image recognition result of the calibration system and the normal image, etc.

The online intelligent calibration system of the ambient gas analyzer in this embodiment can automatically realize the intelligent calibration of the ambient gas analyzer every day, every week, and every quarter, and can automatically calibrate the standard gas used for calibration, the instrument to be calibrated, the sampling pipeline and the monitoring station. Real-time monitoring of environmental status. The system realizes intelligent calibration: it can automatically prepare standard gas according to the target, and perform online traceability, feedback correction and high-frequency calibration for the calibrated instruments. The entire calibration process runs automatically, and can automatically collect data, generate records and calibration reports; the system Realize all-round monitoring: standard gas status can be monitored in real time, such as gas pressure in bottle, gas leakage, gas flow, and key parameters of the instrument being calibrated can be monitored in real time, such as internal gas flow and pressure, internal current, voltage and temperature, desiccant It can monitor the ambient air sampling pipeline in real time, such as the heating temperature of the gas sampling pipe and the gas sampling flow rate, and can monitor the environmental status in the station in real time, such as indoor temperature, humidity, and atmospheric pressure, and can adjust the indoor air conditioning temperature. The system is equipped with on-site calibration system, data center and user-end display system. The on-site calibration system communicates with multiple ambient gas analyzers to be calibrated at the same time through the network port, and can read the displayed value of the calibrated instrument in real time and perform reverse control and feedback correction on the calibrated device. The on-site calibration system It contains on-site monitoring accessories, and realizes real-time monitoring and control of parameters such as flow, temperature, humidity, gas pressure, gas leakage, etc. through the serial port; the on-site calibration system will collect the calibration data, monitoring data and video images, and send them through the Internet For the data center, the data center can monitor, control and record the instruments to be calibrated and the calibration site, as well as the collection of calibration data and the preparation of calibration reports; the data center accesses the client display system through the Internet, and the user logs in to the data center through the display system Obtain calibration records, results and reports of the calibrated instruments, real-time video images of the calibrated instruments and the surrounding environment, and notifications from the data center; When an abnormality or out-of-tolerance occurs during the calibration process, the data center will send a notification to the user in real time to remind them to maintain in time.

The online intelligent calibration system for ambient gas analyzers, which integrates real-time sampling, automatic monitoring, and intelligent calibration, replaces the complicated work of manually going to the site for calibration at regular intervals, realizes intelligent calibration of ambient gas analyzers, and solves the problem of existing manual calibration. A series of problems such as cumbersome operation, time-consuming and laborious, untimely traceability, data authenticity and validity cannot be guaranteed, and operation and maintenance costs are too high, which improves the calibration frequency and efficiency of ambient gas analyzers and reduces operation and maintenance costs. , to eliminate a series of problems such as original data errors or falsification caused by human factors.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present invention; meanwhile, for those skilled in the art, according to the present invention There will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. an online intelligent calibration system for ambient gas analyzers, characterized in that, comprising: a field-side calibration system; the site-end calibration system, comprising: a system control module and a gas standard substance connected with the system control module Holding device, standard gas dynamic preparation module and gas circuit control module; The gas standard substance holding device is communicated with the standard gas dynamic preparation module; the standard gas dynamic preparation module is respectively communicated with the gas circuit control module and the zero gas source in the instrument system to be calibrated; the gas circuit control The modules are respectively communicated with the tested ambient gas analyzer in the tested instrument system and the sampling pipe in the tested instrument system; The system control module is used for: controlling the air circuit control module to switch working modes; the working modes include a calibration mode and a measurement mode; Controlling the standard gas dynamic preparation module to dilute the gas standard substance conveyed by the gas standard substance holding device with the clean gas conveyed by the zero gas source to obtain standard gases of different concentrations; In the calibration mode, control the gas circuit control module to input the clean gas or standard gas with different concentrations to the ambient gas analyzer under test, and obtain the gas concentration measured by the ambient gas analyzer under test display value, and adjust the parameters of the ambient gas analyzer under school according to the gas concentration display value and the corresponding standard value; In the measurement mode, the air circuit control module is controlled to input the ambient air sample collected by the sampling pipe to the ambient gas analyzer under school, and the ambient air sample measured by the ambient gas analyzer under test is acquired. The gas concentration indication value of the air sample is corrected by the linear regression curve; The relationship between the corresponding gas concentration indication values measured by the ambient gas analyzer under school; In the calibration mode, verify the parameters of the linear regression curve according to the set parameter control target; In the calibration mode, the stability of the tested ambient gas analyzer is verified according to the relative standard deviation value and the set deviation control target; the relative standard deviation value is based on the analysis of the tested ambient gas It is determined by the clean gas in the instrument, the standard gas of different concentrations and the corresponding gas concentration indications measured by the ambient gas analyzer under test. 2. The online intelligent calibration system for an ambient gas analyzer according to claim 1, wherein the system control module comprises: Automatic zero-span calibration module for: In the calibration mode, the gas circuit control module is controlled to input the clean gas to the ambient gas analyzer under test, and obtain the gas concentration indication value measured by the ambient gas analyzer under test, according to the The difference between the gas concentration indication and zero adjusts the zero-point parameter of the ambient gas analyzer under test; In the calibration mode, the gas circuit control module is controlled to input standard gases of different concentrations to the ambient gas analyzer under test, and the gas concentration indication value measured by the ambient gas analyzer under test is obtained. The difference between the gas concentration indication value and the standard gas concentration value adjusts the span parameter of the ambient gas analyzer under school; Automatic Indication Calibration Module for: In the measurement mode, the gas circuit control module is controlled to input standard gases with different concentrations to the ambient gas analyzer under test, and the gas concentration indications measured by the ambient gas analyzer under test are obtained, which are determined by different concentrations. Make a linear regression curve between the concentration value of the standard gas concentration and the corresponding gas concentration indication value; Control the gas circuit control module to switch the standard gas of different concentrations that pass into the ambient gas analyzer under school to the ambient air sample collected by the sampling tube, and obtain the ambient air sample measured by the ambient gas analyzer under school. The gas concentration indication value of the air sample, the linear regression curve is used to correct the gas concentration indication value of the ambient air sample; Automatic linearity verification module for: In the calibration mode, the gas circuit control module is controlled to input standard gases with different concentrations to the ambient gas analyzer under test, and the gas concentration indications measured by the ambient gas analyzer under test are obtained, which are determined by different concentrations. The concentration value of the standard gas of concentration and the corresponding gas concentration indication value make a linear regression curve, and determine the parameters of the linear regression curve; the parameters include intercept, slope and linear coefficient; Compare the parameter with the set parameter control target to realize the verification of the parameter; Automatic stability verification module for: In the calibration mode, data collection operations are performed multiple times to obtain the gas concentration indications of standard gases with different concentrations measured by the ambient gas analyzer under test, and calculate the gas concentration indications based on the gas concentration indications of standard gases with different concentrations Relative standard deviation value, comparing the relative standard deviation value with the set deviation control target to verify the stability of the ambient gas analyzer under school; Wherein, the data collection operation is: Control the gas circuit control module to input the clean gas to the ambient gas analyzer under test, and obtain the gas concentration indication value measured by the ambient gas analyzer under test; when the difference between the gas concentration indication value and zero When the value is less than or equal to the set value, control the gas circuit control module to switch the clean gas flowing into the tested ambient gas analyzer to the standard gas of the set concentration, and obtain the tested ambient gas analysis The gas concentration indication of the standard gas of the set concentration measured by the instrument. 3. A kind of online intelligent calibration system of ambient gas analyzer according to claim 1, is characterized in that, also comprises on-site monitoring auxiliary parts; The on-site monitoring accessory is connected to the system control module; the on-site monitoring accessory is used to obtain real-time on-site information; the real-time on-site information includes the temperature of the sampling pipe, the flow rate of the sampling pipe, and the inside of the gas standard substance holding device. pressure, whether there is leakage in the gas standard material holding device, the image of the desiccant in the calibrated instrument system, the image of the monitoring environment, the temperature of the monitoring environment, the humidity of the monitoring environment, and the atmospheric pressure of the monitoring environment; The system control module is further configured to monitor the gas standard substance holding device, the calibrated instrument system and the monitoring environment according to the real-time on-site information, and obtain monitoring results. 4. The online intelligent calibration system for an ambient gas analyzer according to claim 3, further comprising: a data center; The data center is connected to the system control module; the data center is configured to receive calibration results and monitoring results sent by the system control module, and issue alarm information according to the calibration results and the monitoring results. 5. The online intelligent calibration system for an ambient gas analyzer according to claim 4, further comprising: a user terminal display system; The client display system is connected to the data center; the client display system is used to display the alarm information. 6. The online intelligent calibration system for an ambient gas analyzer according to claim 1, wherein the standard gas dynamic preparation module comprises: a preparation gas pipeline, a pressure regulating valve, a first gas mass flow controller, a second gas mass flow controller and a control unit; The preparation gas pipeline is used for connecting the gas standard substance holding device and the gas circuit control module; the pressure regulating valve is arranged on the preparation gas pipeline; the pressure regulating valve is used for regulating the gas The standard substance is depressurized to obtain a depressurized gas standard substance; the first gas mass flow controller is used to control the flow rate of the depressurized gas standard substance passed into the preparation gas pipeline; the second gas mass flow controller The gas mass flow controller is used to control the flow rate of the clean gas introduced into the preparation gas pipeline; the control unit is respectively connected with the first gas mass flow controller, the second gas mass flow controller and the The system control module is connected; the control unit is used to select a preparation mode; the preparation mode includes manual preparation and automatic matching. 7 . The online intelligent calibration system for an ambient gas analyzer according to claim 1 , wherein the gas circuit control module comprises: a first control gas pipeline, a second control gas pipeline, and a first solenoid valve 7 . , a second solenoid valve and a programmable logic controller; The standard gas dynamic preparation module is communicated with the tested ambient gas analyzer through the first control gas pipeline; the standard gas dynamic preparation module is communicated with the sampling pipe through the second control gas pipeline; The programmable logic controller is respectively connected with the first solenoid valve, the second solenoid valve and the system control module; the programmable logic controller is used to control the first solenoid valve and the second solenoid valve The switch state of the solenoid valve; the first solenoid valve is used to control the on-off of the first control gas pipeline; the second solenoid valve is used to control the on-off of the second control gas pipeline. 8. The online intelligent calibration system for an ambient gas analyzer according to claim 3, wherein the on-site monitoring accessories comprise: Sampling tube temperature sensor, sampling tube flow sensor, gas pressure sensor, gas leakage sensor, desiccant image sensor, instrument image sensor, indoor temperature sensor, indoor humidity sensor and indoor atmospheric pressure sensor; The sampling tube temperature sensor is used to collect the temperature of the sampling tube; the sampling tube flow sensor is used to collect the flow rate of the sampling tube; the gas pressure sensor is used to collect the pressure in the gas standard substance holding device; the gas leakage The sensor is used to determine whether there is a leak in the gas standard substance holding device; the desiccant image sensor is used to obtain the image of the desiccant in the instrument system to be calibrated; the instrument image sensor is used to obtain the image of the monitoring environment; the indoor temperature The sensor is used to obtain the temperature of the monitoring environment; the indoor humidity sensor is used to obtain the humidity of the monitoring environment; the indoor atmospheric pressure sensor is used to obtain the atmospheric pressure of the monitoring environment. 9 . The online intelligent calibration system for an ambient gas analyzer according to claim 3 , wherein the system control module is further used to calculate the temperature difference between the temperature of the monitoring environment and the target temperature, and calculate the temperature difference according to the temperature difference. 10 . Adjust the temperature of the environment in which the tested ambient gas analyzer is located. 10. The online intelligent calibration system for an ambient gas analyzer according to claim 2, wherein the system control module further comprises: an on-site operation interface; The field terminal operation interface is used to set monitoring parameters; the monitoring parameters include calibration parameters and state control target parameters.

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