Automatic calibration device and method for gas alarm
阅读说明：本技术 一种气体报警器的自动化标定装置和方法 (Automatic calibration device and method for gas alarm ) 是由 章欢 丁渊明 郝振宇 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种气体报警器的自动化标定装置和方法,其中标定装置包括：气体配比箱,内部充注有气体报警器标定用气体；气体分析仪,分析气体配比箱中气体的浓度；自动注样仪,根据气体分析仪的分析结果,控制气源向气体配比箱中的供气量,以使气体配比箱中实时气体浓度与目标气体浓度相对平衡；标定控制器,与气体报警器连接；计算机,用于设置标定所需的目标气体浓度,并将目标气体浓度发送给自动注样仪,以及获取自动注样仪的实时气体浓度,并通过标定控制器将实时气体浓度发送给气体报警器；该气体报警器包括有温度传感器以及温度&浓度补偿系统。本发明利用温度、浓度补偿方法,无需严格控制标定环境中的温度和气体浓度。(The invention discloses an automatic calibration device and method of gas alarms, wherein the calibration device comprises a gas proportioning box filled with calibration gas for the gas alarms, a gas analyzer for analyzing the concentration of the gas in the gas proportioning box, an automatic sample injection instrument for controlling the gas supply amount of a gas source to the gas proportioning box according to the analysis result of the gas analyzer so as to enable the real-time gas concentration in the gas proportioning box to be relatively balanced with the target gas concentration, a calibration controller connected with the gas alarms, and a computer for setting the target gas concentration required by calibration, sending the target gas concentration to the automatic sample injection instrument, acquiring the real-time gas concentration of the automatic sample injection instrument and sending the real-time gas concentration to the gas alarms through the calibration controller.)
1, kind of gas alarm's automatic calibration device, its characterized in that includes:
the gas alarm is placed in the gas proportioning box for calibration, and gas for calibration of the gas alarm is filled in the gas proportioning box;
the gas analyzer is used for analyzing the concentration of the gas in the gas proportioning box;
the gas source is used for providing gas for the gas proportioning box;
the automatic sample injection instrument controls the gas supply quantity of the gas source to the gas proportioning box according to the analysis result of the gas analyzer so as to enable the real-time gas concentration and the target gas concentration in the gas proportioning box to be relatively balanced;
the calibration controller is connected with the gas alarm;
the computer is used for setting and calibrating the required target gas concentration, sending the target gas concentration to the automatic sample injection instrument, acquiring the real-time gas concentration of the automatic sample injection instrument, and sending the real-time gas concentration to the gas alarm through the calibration controller;
the gas alarm comprises a temperature sensor and a temperature and concentration compensation system, wherein the temperature sensor is used for acquiring the ambient temperature near the gas alarm, and the temperature and concentration compensation system is used for converting a calibration value acquired under a non-calibration condition into a calibration value under a calibration condition so as to finish automatic calibration.
2. The automatic calibration device for kinds of gas alarms according to claim 1, wherein the gas proportioning box comprises a box body with an opening and a box cover for closing the opening of the box body, and the box body is provided with a fan for rapidly and uniformly mixing gas in the gas proportioning box.
3. The kind of gas alarm automatic calibration device of claim 1, wherein several said gas alarms are connected to said calibration controller for batch calibration.
4. The automatic calibration device for gas alarm of claim 3, wherein the calibration controller is placed in the gas proportioning box.
5. The automatic calibration device for kinds of gas alarms according to claim 1, wherein the gas source is a gas cylinder.
The automatic calibration method of the gas alarm is characterized in that the automatic calibration device of the gas alarm of any of claims 1 to 5 is used, and comprises the following steps:
s1, placing the gas alarm in a gas proportioning box for sealing;
s2, setting the concentration of the target gas required by calibration through a computer, and sending the concentration of the target gas to an automatic sample injection instrument;
s3, the gas analyzer collects the real-time gas concentration in the gas proportioning box and sends the real-time gas concentration to the automatic sample injector;
s4, judging whether the real-time gas concentration is the same as the target gas concentration by the automatic sample injection instrument so as to perform the action of gas injection, and supplying gas to the gas proportioning box by the automatic sample injection instrument through a gas source only when the real-time gas concentration is lower than the target gas concentration so as to maintain the relative balance between the real-time gas concentration and the target gas concentration;
s5, the computer acquires the real-time gas concentration of the automatic sample injection instrument and sends the real-time gas concentration to the gas alarm through the calibration controller;
and S6, acquiring the ambient temperature by the gas alarm through the temperature sensor, converting the calibration value acquired under the non-calibration condition into the calibration value under the calibration condition through the temperature and concentration compensation system, and finishing automatic calibration.
7. The method for automatically calibrating kinds of gas alarms according to claim 6, wherein the gas alarm is a semiconductor gas sensor, and the calibrating of the temperature & concentration compensation system comprises the following steps:
s1: when calibration is carried out under the non-calibration condition, the ambient temperature near the gas sensor is obtained through the temperature sensor, the resistance value of the sensor is obtained through the gas sensor, and the real-time gas concentration is obtained through the computer;
s2, searching an upper temperature value and a lower temperature value which are close to the current environment temperature in a pre-established temperature compensation database, and generating a normalized coefficient and gas concentration comparison table under the current environment temperature condition by adopting a linear interpolation method;
s3, searching the upper and lower gas concentrations which are close to the current real-time gas concentration in the step S1 in the regression coefficient and gas concentration comparison table generated in the step S2, and calculating to obtain a regression coefficient under the current ambient temperature and gas concentration condition by adopting a linear interpolation method, namely a temperature and concentration compensation coefficient converted into a calibration condition under a non-calibration condition;
s4, dividing the sensor resistance value under the non-calibration condition obtained in the step S1 by the temperature and concentration compensation coefficient obtained in the step S3 to obtain a calibration value under the calibration condition, and completing automatic calibration;
the temperature compensation database is established based on the corresponding relation between different gas concentrations and the normalized coefficients under different temperature conditions.
8. The method for automatically calibrating an gas alarm according to claim 7, wherein the calibrated resistance is a resistance measured by the gas sensor under a standard condition of 20-35 ℃ temperature and 30-70% full-scale gas concentration of the semiconductor gas sensor.
9. The method for automatically calibrating an gas alarm according to claim 7, wherein the step of establishing the temperature compensation database includes the steps of:
s01, obtaining resistance values of the semiconductor gas sensor corresponding to different gas concentrations under the standard temperature condition, performing a grouping treatment on each resistance value and a calibrated resistance value of the semiconductor gas sensor respectively to obtain grouping coefficients corresponding to different gas concentrations, and establishing a grouping coefficient and gas concentration comparison table at the standard temperature;
and S02, repeating the step S01 to obtain the coefficients corresponding to the resistance values and the calibrated resistance values of the other gas concentration sensors with different temperatures, and establishing a temperature compensation database.
10. The method for automatically calibrating kinds of gas alarms according to claim 9, wherein in step S01, the different gas concentrations are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100% of the full range of the semiconductor gas sensor.
Technical Field
The invention relates to a gas alarm calibration technology.
Background
At present, the common practice in the industry is that, under the condition of standard temperature (usually 20 ℃), the gas alarm is placed in a gas environment with an alarm concentration point (usually 5000ppm), the characteristic value output by the sensor at the moment is detected, is a resistance value or a voltage value, and in the working process of the gas alarm after calibration is completed, a measured value at the current temperature is converted into a measured value at the standard temperature through an internal temperature compensation algorithm, and then the measured value is compared with a calibration value, so that whether the current gas concentration exceeds the standard or not is judged.
The calibration method requires strict control of the production process, wherein the environment temperature is controlled to be +/-1 ℃ and the gas concentration is controlled to be +/-100 ppm in the -like condition, and in the calibration process, because the sensor generates heat, the consumption and leakage of gas are difficult to maintain balance through manual supplement.
In the calibration process of the existing sensor, a manufacturer generally adopts a circulating gas supply mode to maintain the stability of the temperature and the concentration of gas in the calibration process.
However, the currently adopted circulating gas supply scheme needs to invest in relatively expensive production equipment, and has the problems of high production cost, much exhaust gas emission, gas leakage and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic calibration device and method for gas alarms, which do not need to strictly control the temperature and the gas concentration in a calibration environment.
In order to solve the technical problems, the invention adopts the following technical scheme that the automatic calibration device of gas alarms comprises:
the gas alarm is placed in the gas proportioning box for calibration, and gas for calibration of the gas alarm is filled in the gas proportioning box;
the gas analyzer is used for analyzing the concentration of the gas in the gas proportioning box;
the gas source is used for providing gas for the gas proportioning box;
the automatic sample injection instrument controls the gas supply quantity of the gas source to the gas proportioning box according to the analysis result of the gas analyzer so as to enable the real-time gas concentration and the target gas concentration in the gas proportioning box to be relatively balanced;
the calibration controller is connected with the gas alarm;
the computer is used for setting and calibrating the required target gas concentration, sending the target gas concentration to the automatic sample injection instrument, acquiring the real-time gas concentration of the automatic sample injection instrument, and sending the real-time gas concentration to the gas alarm through the calibration controller;
the gas alarm comprises a temperature sensor and a temperature and concentration compensation system, wherein the temperature sensor is used for acquiring the ambient temperature near the gas alarm, and the temperature and concentration compensation system is used for converting a calibration value acquired under a non-calibration condition into a calibration value under a calibration condition so as to finish automatic calibration.
Optionally, the gas proportioning box comprises a box body with an opening and a box cover with an opening of a closed box body, and a fan for rapidly mixing gas in the gas proportioning box is installed on the box body.
Optionally, a plurality of the gas alarms are connected with the calibration controller for batch calibration.
Optionally, the calibration controller is placed in the gas proportioning box.
Optionally, the gas source is a gas supply steel cylinder.
The invention also provides an automatic calibration method of the gas alarms, and the automatic calibration device comprises the following steps:
s1, placing the gas alarm in a gas proportioning box for sealing;
s2, setting the concentration of the target gas required by calibration through a computer, and sending the concentration of the target gas to an automatic sample injection instrument;
s3, the gas analyzer collects the real-time gas concentration in the gas proportioning box and sends the real-time gas concentration to the automatic sample injector;
s4, judging whether the real-time gas concentration is the same as the target gas concentration by the automatic sample injection instrument so as to perform the action of gas injection, and supplying gas to the gas proportioning box by the automatic sample injection instrument through a gas source only when the real-time gas concentration is lower than the target gas concentration so as to maintain the relative balance between the real-time gas concentration and the target gas concentration;
s5, the computer acquires the real-time gas concentration of the automatic sample injection instrument and sends the real-time gas concentration to the gas alarm through the calibration controller;
and S6, acquiring the ambient temperature by the gas alarm through the temperature sensor, converting the calibration value acquired under the non-calibration condition into the calibration value under the calibration condition through the temperature and concentration compensation system, and finishing automatic calibration. The gas alarm is a semiconductor gas sensor, and the calibration of the temperature and concentration compensation system comprises the following steps:
s1: when calibration is carried out under the non-calibration condition, the ambient temperature near the gas sensor is obtained through the temperature sensor, the resistance value of the sensor is obtained through the gas sensor, and the real-time gas concentration is obtained through the computer;
s2, searching an upper temperature value and a lower temperature value which are close to the current environment temperature in a pre-established temperature compensation database, and generating a normalized coefficient and gas concentration comparison table under the current environment temperature condition by adopting a linear interpolation method;
s3, searching the upper and lower gas concentrations which are close to the current real-time gas concentration in the step S1 in the regression coefficient and gas concentration comparison table generated in the step S2, and calculating to obtain a regression coefficient under the current ambient temperature and gas concentration condition by adopting a linear interpolation method, namely a temperature and concentration compensation coefficient converted into a calibration condition under a non-calibration condition;
s4, dividing the sensor resistance value under the non-calibration condition obtained in the step S1 by the temperature and concentration compensation coefficient obtained in the step S3 to obtain a calibration value under the calibration condition, and completing automatic calibration;
the temperature compensation database is established based on the corresponding relation between different gas concentrations and the normalized coefficients under different temperature conditions.
Optionally, the calibration resistance value is a resistance value measured by the gas sensor in a standard state that the temperature is 20-35 ℃ and the gas concentration is 30-70% of the full scale of the semiconductor gas sensor.
Optionally, the establishing of the temperature compensation database includes the following steps:
s01, obtaining resistance values of the semiconductor gas sensor corresponding to different gas concentrations under the standard temperature condition, performing a grouping treatment on each resistance value and a calibrated resistance value of the semiconductor gas sensor respectively to obtain grouping coefficients corresponding to different gas concentrations, and establishing a grouping coefficient and gas concentration comparison table at the standard temperature;
and S02, repeating the step S01 to obtain the coefficients corresponding to the resistance values and the calibrated resistance values of the other gas concentration sensors with different temperatures, and establishing a temperature compensation database.
Optionally, in step S01, the different gas concentrations are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% of the full-scale range of the semiconductor gas sensor, respectively.
The technical scheme adopted by the invention has the following beneficial effects:
1. by using the temperature and concentration compensation method, the temperature and the gas concentration in the calibration environment do not need to be strictly controlled, and the problems of large investment, high production cost, more waste gas emission, gas leakage and the like of the alarm calibration equipment in the prior art are solved.
2. Because the gas alarm can generate heat, and the times of measurement of the gas alarm are more in quantity, and the gas proportioning box can have uneven temperature, the temperature sensor of the gas alarm is used for testing the temperature of the surrounding environment of the alarm, and the temperature testing error caused by uneven temperature is reduced.
3. Because the sample injection of the automatic sample injection instrument has deviation, and the concentration of the real-time gas in the gas proportioning box cannot be actively reduced even though the concentration of the real-time gas in exceeds the concentration of the target gas, generally carries out calibration after the gas is dissipated to the proper concentration.
The following detailed description and the accompanying drawings are included to provide a further understanding of the invention.
Drawings
FIG. 1 is a schematic structural diagram of an automatic calibration device according to the present invention;
in fig. 1: the device comprises a
FIG. 2 is a flow chart of an automated calibration method according to the present invention;
FIG. 3 is a flow chart of calibration of the temperature & concentration compensation system;
FIG. 4 is a flowchart illustrating the establishment of a temperature compensation database according to an embodiment of the present invention.
FIG. 5 is a schematic diagram of a resistance measurement circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a temperature measurement circuit according to an embodiment of the invention.
Detailed Description
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.
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