CN112730751A - Gas concentration calibration box - Google Patents
Gas concentration calibration box Download PDFInfo
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- CN112730751A CN112730751A CN202011574637.3A CN202011574637A CN112730751A CN 112730751 A CN112730751 A CN 112730751A CN 202011574637 A CN202011574637 A CN 202011574637A CN 112730751 A CN112730751 A CN 112730751A
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- gas
- box
- gas concentration
- box body
- calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
The invention relates to the technical field of gas detection, in particular to a gas concentration calibration box which comprises a box body, wherein a box door, a gas inlet and a gas outlet are arranged on the box body, a plurality of fans and a plurality of flow dividing devices are arranged in the box body, the gas inlet is provided with a gas inlet valve, the gas outlet is provided with a gas exhaust valve, and a sensor placing area to be calibrated is arranged in the box body. The gas calibration device is simple in structure, accurate in gas calibration data and short in calibration time.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a gas concentration calibration box.
Background
The measurement of the concentration of a substance by a sensor generally utilizes the correlation between the response value of the sensor and the concentration of the substance to be measured. And the zero point and the sensitivity of the sensor inevitably drift during the use process. In order to obtain more accurate measurements, calibration of the sensor before measurement is generally required.
Calibration requires measuring a sensor by using a standard substance with known concentration, and for liquid and solid substances, the concentration of the standard substance is relatively easy to obtain, and the calibration can be generally realized by weighing the liquid and solid substances through an analytical balance in a laboratory and metering the volume by using a volumetric flask.
The gas calibration is basically that a ruler which takes a value generated by high-precision equipment as measurement is input into a sensor to be calibrated to obtain the output quantity of the sensor, and then the corresponding relation between the input and the output of the sensor is solved through a mathematical method. Calibration of gas sensors is usually performed by placing the sensor in a sealed container filled with a standard gas, using the standard gas with a known concentration as an input value.
US patent publication US4829809 discloses a gas electrolysis analysis apparatus and method, in which an electrochemical sensor is placed in a chamber of known volume, first a gas to be measured of unknown concentration is introduced into the chamber, the chamber is closed during calibration, the response value of the sensor is continuously reduced due to the consumption of gas, the current is attenuated exponentially according to the faraday's law, and the sensitivity of the sensor and the gas concentration can be solved according to the curve of the current of the sensor changing with time and the initial response current of the sensor by the volume of the chamber. Although this patent provides a method of measuring gas concentration without knowledge of the sensitivity of the sensor, it still requires a sealed chamber. It can thus be seen that the tightness of the container is of particular importance.
At present, in a calibration instrument for the relationship between the concentration measured by a gas sensor and the display voltage, an adhesive is usually used for adhering parts required by a box body, and the adhesive can be oxidized and separated from the box body after being used for a certain time, so that the sealing property of the box body is influenced by air leakage; and the odor emitted by the adhesive has certain influence on the calibration gas concentration and the performance of the sensor, so that the accuracy of the numerical value of the relation between the gas concentration measured by the gas sensor and the output voltage of the gas sensor is influenced. The existing box body is not provided with a gas stirring device inside, the gas is introduced for a long time, the gas concentration in the box body can reach a uniform state, and the accuracy of the test data of the sensor can be influenced. Therefore, in order to overcome the drawbacks of the conventional calibration apparatus, it is necessary to develop a new calibration container for gas sensors, so as to improve the sealing performance of the apparatus and further improve the calibration apparatus for the relationship between the measured concentration of the gas sensor and the display voltage, thereby avoiding the defect that the adhesive affects the accuracy of the measured data.
Disclosure of Invention
The invention aims to provide a gas concentration calibration box, aims to overcome the defects of the prior art, has good sealing performance, can solve the problem that the sample gas in the box body is uniform, and simultaneously solves the defect that the accuracy of a measured value is influenced by using an adhesive in the prior gas concentration calibration instrument.
The invention is realized by the following steps: the utility model provides a gas concentration calibrates case, includes the box, set up chamber door, air inlet, gas vent on the box, inside a plurality of fans and a plurality of diverging device of setting up of box, the air inlet sets up the air inlet valve, the gas vent sets up discharge valve, set up in the box and treat to calibrate the sensor and place the district.
Preferably, the exhaust port is connected to an exhaust pipe.
Preferably, the box body and the box door are made of organic glass.
Preferably, all the surfaces of the box body are fixedly connected through air leakage prevention rubber rings and bolts.
Preferably, the door is provided with handles.
Preferably, the number of the fans is three, and the number of the flow dividing devices is 3.
Preferably, the fan is arranged at the lower left side inside the box body, and correspondingly, the flow dividing device is arranged at the lower right side inside the box body.
By adopting the technical scheme provided by the invention, the gas calibration device is simple in structure, the gas calibration data is more accurate, and the calibration time is greatly shortened.
Drawings
Fig. 1 is a schematic structural diagram of a gas concentration calibration box according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to fig. 1 and an embodiment. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The gas concentration calibration box provided by the invention comprises a box body, and the whole box body is made of organic glass made of acrylic materials, so that the adsorbability of gas on the surface of the glass can be effectively reduced.
Set up chamber door 5, air inlet 3, gas vent 6 on the box, box inside sets up a plurality of fans 8 and a plurality of diverging device 2, and air inlet department still sets up air inlet valve (not shown in the figure), and the gas vent sets up discharge valve (not shown in the figure), sets up in the box and treats demarcation sensor and place district 1. Air leakage-proof rubber rings 9 and bolts 7 are arranged between the connecting seams of all surfaces of the box body for reinforcing and attaching. And an air leakage preventing rubber ring 9 and a bolt 7 are arranged between the box door and the box body for reinforcing and attaching. Compared with a traditional box body bonded by bonding glue, the rubber ring has no abnormal smell, and the calibration accuracy of measurable gas is greatly improved. Fan 8 sets up in the inside left side below of box, and in this embodiment, fan 8's quantity is recommended to be three, and is corresponding, installs three diverging device 2 in box right side below, and when fan 8 started, the air current from left to right can divide three not equidirectional reposition of redundant personnel when meetting diverging device 2, and when letting in appearance gas, the circulation of the internal gas of box can be accelerated to the fan, makes test gas concentration even with higher speed, improves the accuracy of sensor sampling gas concentration.
The box door 5 is also an organic glass door, and good sealing performance can be achieved between the box door and the front surface of the box body in a door closing state. The air inlet and the air inlet are provided with air inlet valves, and only the air inlet can not be used; the exhaust port is also provided with an exhaust valve, so that the air can only flow out but not flow in. An exhaust pipe is connected to one end of the exhaust port, harmful gas is exhausted to a pipeline appointed by a company when ventilation calibration is carried out, and the body of a calibrated person cannot be injured.
In the embodiment provided by the invention, three fans are arranged in the gas calibration box, when the gas calibration is carried out, the fan switch is turned on, the fans are started to drive the airflow of the box body to blow to the opposite airflow shunting device, so that the gas can be divided into three airflows to flow in three directions in the box body, and the uniformity of the gas in the box body is accelerated. After the gas concentration in the calibration box body is uniform, the sensing of the calibration area can convert a relatively stable voltage signal after sensing the stable gas concentration, and the calibrated gas concentration is relatively accurate. Compared with the common gas calibration data obtained by the traditional calibration box without the stirring fan and the flow dividing device, the gas calibration data is more accurate, and the calibration time is greatly shortened.
The gas concentration calibration box provided by the invention provides an ideal test environment for users, has a wide application range, can test most gas sensors in the box body, and can conveniently and accurately measure the relationship between the detection concentration and the output voltage of the gas sensor. In addition, no adhesive is used in the installation process of the box body, the defect that the accuracy of a test result is affected by the adhesive is avoided, and the adhesive is directly replaced by a sealing rubber ring and a bolt.
It should be noted that, those skilled in the art can make various modifications and variations on the above-described embodiments, such as changing the position of the opening of the relevant component, changing the number of the internal gas stirring fans, etc., and these modifications and variations fall within the scope of the present invention, and it should be understood that the above-described specific description is only for the purpose of better explaining the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The utility model provides a gas concentration calibrates case, includes the box, its characterized in that, set up chamber door, air inlet, gas vent on the box, inside a plurality of fans and the plurality of diverging device of setting up of box, the air inlet sets up the air inlet valve, the gas vent sets up discharge valve, set up in the box and treat the demarcation sensor and place the district.
2. The gas concentration calibration box according to claim 1, wherein the exhaust port is connected with an exhaust pipe.
3. The gas concentration calibration box according to claim 1, wherein the box body and the box door are made of organic glass.
4. The gas concentration calibration box according to claim 1, wherein each surface of the box body is fixedly connected with each other through a gas leakage prevention rubber ring and a bolt.
5. The gas concentration calibration box according to claim 1, wherein the box door is provided with handles.
6. The gas concentration calibration box according to claim 1, wherein the number of the fans is three, and the number of the flow dividing devices is 3.
7. The gas concentration calibration box according to claim 1, wherein the fan is disposed at the lower left inside the box body, and correspondingly, the flow dividing device is disposed at the lower right inside the box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011574637.3A CN112730751A (en) | 2020-12-28 | 2020-12-28 | Gas concentration calibration box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011574637.3A CN112730751A (en) | 2020-12-28 | 2020-12-28 | Gas concentration calibration box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112730751A true CN112730751A (en) | 2021-04-30 |
Family
ID=75606030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011574637.3A Pending CN112730751A (en) | 2020-12-28 | 2020-12-28 | Gas concentration calibration box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112730751A (en) |
-
2020
- 2020-12-28 CN CN202011574637.3A patent/CN112730751A/en active Pending
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