Novel carbon dioxide calibrator and control method thereof

Abstract

The invention relates to the technical field of carbon dioxide detection, and discloses a novel carbon dioxide calibrator and a control method thereof.The novel carbon dioxide calibrator comprises a container bag, a gas inlet end, a gas outlet end, a calibrator body and a wire interface, the gas inlet end and the gas outlet end are arranged on the container bag, the calibrator body is installed in the container bag, and the wire interface is installed on the container bag; the wiring end of the calibrator is electrically connected with the outside through the wire interface. The calibrator comprises a bottom shell, an upper cover, a control circuit board, a carbon dioxide sensor and a ventilation mechanism, the upper cover is installed on the bottom shell, a device cavity is defined by the bottom shell and the upper cover, the control circuit board and the carbon dioxide sensor are arranged in the device cavity, and the ventilation mechanism is installed on the bottom shell and the upper cover and used for communicating the container bag environment with the environment in the device cavity. The control end of the carbon dioxide sensor is electrically connected with the control end of the control circuit board. The calibrator can realize simple operation of carbon dioxide detection, is convenient to carry, reduces the cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide detection, and in particular to a novel carbon dioxide calibrator and a control method thereof. Background Art

[0002] Carbon dioxide is one of the essential gases for plants to carry out photosynthesis. It can promote plant growth and nutrient absorption. Studies have shown that when the carbon dioxide concentration reaches 800ppm, the overall growth rate of crops is accelerated and the yield increases accordingly. As for how to know the concentration of carbon dioxide, it is generally necessary to use a carbon dioxide concentration tester for measurement. There will be a carbon dioxide probe on the carbon dioxide concentration tester. During the use of the carbon dioxide concentration tester, due to the long-term operation of the carbon dioxide probe, there will be problems such as decreased detection accuracy. Carbon dioxide needs to be tested and calibrated regularly to ensure that the carbon dioxide probe detects accurately. However, the detection and calibration of carbon dioxide probes on the market requires them to be placed in a calibration device for detection and calibration. This method is cumbersome to operate, requires the assistance of large equipment, is costly, and is inconvenient to carry. In addition, during detection, it is easily affected by humid air.

[0003] Therefore, the existing carbon dioxide detection technology needs to be further designed. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of the existing carbon dioxide detection technology, such as complicated operation, inconvenient to carry, high cost, and susceptibility to environmental influences. By rationalizing the design of the carbon dioxide detection technology, using a container bag, an air inlet end, an air outlet end, a calibrator and a wire interface, and the calibrator includes a bottom shell, an upper cover, a control circuit board, a carbon dioxide sensor and a ventilation mechanism, it is possible to achieve simple operation, easy carrying and low cost of carbon dioxide detection, and reduce the impact of environmental factors.

[0005] The technical solution of the present invention is as follows:

[0006] A novel carbon dioxide calibrator, comprising: a container bag, an air inlet, an air outlet, a calibrator and a wire interface, wherein the air inlet and the air outlet are respectively arranged on the container bag, the calibrator is installed in the container bag, the wire interface is installed on the container bag, and the connection terminal of the calibrator is electrically connected to the outside through the wire interface;

[0007] The calibrator comprises a bottom shell, an upper cover, a control circuit board, a carbon dioxide sensor and a ventilation mechanism, wherein the upper cover is mounted on the bottom shell, the bottom shell and the upper cover enclose a chamber, the control circuit board and the carbon dioxide sensor are arranged in the chamber, the ventilation mechanism is mounted on the bottom shell and the upper cover, the ventilation mechanism is used to connect the environment of the container bag with the environment in the chamber, and the control end of the carbon dioxide sensor is electrically connected to the control end of the control circuit board;

[0008] Wherein, the container bag is a transparent plastic container bag.

[0009] Furthermore, the container bag is a waterproof and wear-resistant container bag.

[0010] Furthermore, the calibrator also includes a protective cover, which is arranged in the device cavity, and the control circuit board and the carbon dioxide sensor are arranged in the protective cover.

[0011] Furthermore, the protective cover is a waterproof and breathable protective cover.

[0012] Furthermore, the carbon dioxide sensor is a graphene carbon dioxide sensor.

[0013] Furthermore, the calibrator also includes a display, which is mounted on the upper cover, and a control end of the display is electrically connected to a control end of the control circuit board.

[0014] Furthermore, the display is a liquid crystal display or a LED display.

[0015] Furthermore, the ventilation mechanism comprises an annular air passage, which is arranged on the bottom shell and the upper cover, with an air inlet of the annular air passage facing the air inlet end and an air outlet of the annular passage facing the air outlet end.

[0016] Furthermore, at least two annular air passages are selected.

[0017] Furthermore, a one-way air outlet valve is provided on the air outlet end.

[0018] Furthermore, the bottom shell, the upper cover and the ventilation mechanism are all made of plastic.

[0019] Furthermore, the bottom shell and the upper cover are connected by snap-fit ​​connection or screw thread connection.

[0020] Furthermore, the ventilation mechanism includes a bottom ventilation mechanism and a cover ventilation mechanism, the bottom ventilation mechanism is arranged on the bottom shell, and the cover ventilation mechanism is arranged on the upper cover.

[0021] Furthermore, the bottom ventilation mechanism and the bottom shell are integrally formed, and the cover ventilation mechanism and the upper cover are integrally formed.

[0022] Furthermore, a novel method for controlling a carbon dioxide calibrator is provided, wherein the steps of the method are as follows:

[0023] Step 1: Making a CO2 Sensor

[0024] A graphene substrate is selected, and a zinc oxide film is deposited on the graphene substrate by magnetron sputtering technology, and then a water bath solution is prepared, wherein the water bath solution includes 15-20 parts of copper acetate, 35-40 parts of zinc nitrate, 5-10 parts of silver nitrate and 30-45 parts of ammonia water, and the graphene substrate with zinc oxide deposited is placed in the water bath solution and heated at a constant temperature for 3 hours, and the temperature is kept constant at 90° C. After the heating is completed, silver / zinc oxide / copper oxide nano-objects are deposited on the zinc oxide, and the graphene substrate is taken out, and then rinsed with deionized water, and naturally dried and cooled to room temperature, and metallic silver is used as an electrode, and the first metallic silver is connected to the zinc oxide film, and the second metallic silver is connected to the silver / zinc oxide / copper oxide nano-object, and the production of the carbon dioxide sensor is completed;

[0025] Step 2: Making a waterproof and breathable protective cover

[0026] 8-9 parts of styrene-butadiene-styrene block copolymer, 65-68 parts of oxolane, 22-23 parts of N,N-dimethylformamide and 0.01-0.04 parts of lithium chloride are selected by weight, and the oxolane and N,N-dimethylformamide are first added into a blender and mixed uniformly to form a primary mixed solution, and then the styrene-butadiene-styrene block copolymer is added into the primary mixed solution, and stirring is continued for 2 hours to make it uniformly mixed, and then lithium chloride is added and stirred for 30 minutes. After uniform mixing, a final mixed solution is formed; The final mixed solution is spun by a spinning machine, and the spun fibers are woven into a spinning membrane by a weaving machine; an appropriate amount of aminomethane buffer solution containing dopamine is selected, and the spinning membrane is immersed in the aminomethane buffer solution containing dopamine, and after immersion for 2.5 hours, it is dried to form a dopamine spinning membrane, and then the dopamine spinning membrane is immersed in an ethanol solution containing silica particles, and after immersion for 1 hour, it is naturally dried to form a waterproof and breathable membrane; a plastic protective plate with a plurality of through holes is selected, and the waterproof and breathable membrane is pasted on the plastic protective plate to produce a waterproof and breathable protective cover;

[0027] Step 3: Making a waterproof and wear-resistant container bag

[0028] A transparent plastic container bag is selected, a polyethylene terephthalate layer is sprayed on the surface thereof, and then a zinc oxide-polytetrafluoroethylene layer is deposited on the polyethylene terephthalate layer by magnetron sputtering technology, and then nano-silicon dioxide, graphene and polytetrafluoroethylene are deposited on the zinc oxide-polytetrafluoroethylene layer by magnetron sputtering technology to prepare a final waterproof and wear-resistant container bag;

[0029] Step 4: Assembly of the CO2 Calibrator

[0030] Use the carbon dioxide sensor of step 1, select the waterproof and breathable protective cover of step 2, select the container bag of step 3, select the air inlet, air outlet, bottom shell, upper cover, control circuit board, carbon dioxide sensor, ventilation mechanism, waterproof and breathable protective cover, display and wire interface, the air inlet and air outlet are respectively arranged on the container bag, the calibrator is installed in the container bag, the wire interface is installed on the container bag, and the wiring terminal of the calibrator is electrically connected to the outside through the wire interface;

[0031] The upper cover is mounted on the bottom shell, the bottom shell and the upper cover form a cavity, a control circuit board and a carbon dioxide sensor are arranged in the cavity; the protective cover is arranged in the cavity, a control circuit board and a carbon dioxide sensor are arranged in the protective cover, a ventilation mechanism is mounted on the bottom shell and the upper cover, the ventilation mechanism is used to connect the environment of the container bag with the environment in the cavity, and the control end of the carbon dioxide sensor is electrically connected to the control end of the control circuit board; the container bag is a transparent plastic container bag; the display is mounted on the upper cover, and the control end of the display is electrically connected to the control end of the control circuit board;

[0032] Step 5: Operation of the CO2 Calibrator

[0033] Select the carbon dioxide calibrator in step 4, release all the air in the container bag through the one-way valve at the outlet, close the outlet, and then inject carbon dioxide from the inlet. Connect the power to the control circuit board, start the control circuit board, and use the carbon dioxide sensor to collect carbon dioxide data. Based on the injected gas, check whether the carbon dioxide probe meets the accuracy requirements of the equipment. If the result does not meet the requirements, the calibrator needs to be calibrated by changing the injected gas to nitrogen. After injection, perform zero value calibration on the calibrator, and then replace nitrogen with carbon dioxide. Verify the accuracy of the carbon dioxide probe to complete the operation of the carbon dioxide calibrator.

[0034] Beneficial Effects

[0035] The present invention rationalizes the design of carbon dioxide detection technology, adopts a container bag, an air inlet, an air outlet, a calibrator and a wire interface, and the calibrator includes a bottom shell, an upper cover, a control circuit board, a carbon dioxide sensor and a ventilation mechanism, so as to achieve simple operation, easy carrying and cost reduction of carbon dioxide detection, and reduce the impact of environmental factors. The configuration of a waterproof and breathable protective cover can reduce the impact of moisture on carbon dioxide detection, so as to more accurately collect carbon dioxide data; the one-way air inlet and air outlet can realize the storage and replacement of carbon dioxide; the graphene carbon dioxide sensor can improve the sensitivity of detection calibration and rapid response. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural schematic diagram of a novel carbon dioxide calibrator of the present invention.

[0037] Figure 2 The present invention is a structural schematic diagram of a novel carbon dioxide calibrator.

[0038] Figure 3 The present invention is a schematic structural diagram of a novel protective cover for a carbon dioxide calibrator.

[0039] Figure 4 The present invention is a structural schematic diagram of a carbon dioxide sensor of a novel carbon dioxide calibrator.

[0040] Figure 5 This is a SEM image of a novel waterproof and breathable membrane of a carbon dioxide calibrator of the present invention.

[0041] Figure 6 This is a SEM image of a graphene substrate with zinc oxide for a novel carbon dioxide calibrator of the present invention.

[0042] Figure 7 This is a SEM image of a carbon dioxide sensor of a novel carbon dioxide calibrator of the present invention.

[0043] Figure 8 The figure is a contact angle diagram of a novel waterproof and breathable protective cover of a carbon dioxide calibrator of the present invention.

[0044] Fig. 9 This is a schematic diagram of the contact angle of a novel waterproof and wear-resistant container bag of a carbon dioxide calibrator of the present invention.

[0045] Figure numbers: 01, container bag; 02, air inlet end; 03, air outlet end; 04, wire interface; 05, bottom shell; 06, annular air duct; 07, upper cover; 08, display; 09, protective cover; 10, carbon dioxide sensor; 11, control circuit board. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1-Figure 4 As shown, the present invention provides a novel carbon dioxide calibrator and a control method thereof, the carbon dioxide calibrator comprises: a container bag 01, an air inlet end 02, an air outlet end 03, a calibrator and a wire interface 04, the container bag 01 is a transparent container bag; the container bag 01 is a plastic container bag, and the container bag 01 has a waterproof and wear-resistant effect;

[0048] The air inlet 02 and the air outlet 03 are respectively arranged on the container bag 01, the calibrator is installed in the container bag 01, the wire interface 04 is installed on the container bag 01, and the connection terminal of the calibrator is electrically connected to the outside through the wire interface 04;

[0049] The calibrator comprises a bottom shell 05, an upper cover 07, a control circuit board 11, a carbon dioxide sensor 10 and a ventilation mechanism, wherein the upper cover 07 is mounted on the bottom shell 05, the bottom shell 05 and the upper cover 07 enclose a cavity, the cavity is provided with a control circuit board 11 and a carbon dioxide sensor 10, the ventilation mechanism is mounted on the bottom shell 05 and the upper cover 07, the ventilation mechanism is used to connect the environment of the container bag 01 with the environment in the cavity, the control end of the carbon dioxide sensor 10 is electrically connected to the control end of the control circuit board 11, and the control circuit board 11 is electrically connected to the outside through a wire interface; the calibrator also comprises a protective cover 09, the protective cover 09 is arranged in the cavity, and the control circuit board 11 and the carbon dioxide sensor 10 are arranged in the protective cover 09; the protective cover 09 is a waterproof and breathable protective cover; the calibrator also comprises a display 08, the display 08 is mounted on the upper cover 07, the control end of the display 08 is electrically connected to the control end of the control circuit board 11; the display 08 is a liquid crystal display or an LED display;

[0050] The ventilation mechanism includes an annular air passage 06, which is arranged on the bottom shell 05 and the upper cover 07, the air inlet of the annular air passage 06 faces the air inlet end 02, and the air outlet of the annular passage faces the air outlet end 03; four annular air passages 06 are selected; a one-way air outlet valve is arranged on the air outlet end 03; and a one-way air inlet valve is arranged on the air inlet end 02;

[0051] The bottom shell 05, the upper cover 07 and the ventilation mechanism are all made of plastic; the bottom shell 05 and the upper cover 07 are connected by snap-fit ​​or screw thread; the ventilation mechanism includes a bottom ventilation mechanism and a cover ventilation mechanism, the bottom ventilation mechanism is arranged on the bottom shell 05, and the cover ventilation mechanism is arranged on the upper cover 07; the bottom ventilation mechanism and the bottom shell 05 are integrally formed, and the cover ventilation mechanism and the upper cover 07 are integrally formed;

[0052] The carbon dioxide sensor 10 is a graphene carbon dioxide sensor.

[0053] A specific implementation method of the present invention is as follows: assemble the calibrator and place it where the carbon dioxide concentration needs to be detected and calibrated. First, vacuum is extracted from the container bag through the air outlet, and then external carbon dioxide is put into the container bag through the air inlet. Power is supplied to the control circuit board, and the control circuit board controls the carbon dioxide sensor to detect the carbon dioxide content, and controls the display to display the test data through processing and analysis.

[0054] Specifically, the carbon dioxide probe is placed in a container bag, and then the container bag is closed. One side of the container bag is provided with a placement opening, and a sealing clip strip is provided at the opening to seal the opening. After the air is extracted from the air outlet of the one-way valve, the air outlet is closed, and then carbon dioxide of a standard concentration (for example, 400ppm or 1000ppm, etc.) is injected from the air inlet. According to the injected gas, whether the carbon dioxide probe meets the accuracy requirements of the equipment is detected; if the result does not meet the requirements, the carbon dioxide probe needs to be calibrated by changing the injected gas into nitrogen. After injection, the probe is calibrated to zero value, and then the nitrogen is replaced with carbon dioxide to verify the accuracy of the carbon dioxide probe. The carbon dioxide probe here is also a calibrator.

[0055] Among them, a new method for controlling a carbon dioxide calibrator is provided, and the steps of the control method are as follows:

[0056] Step 1: Making a CO2 Sensor

[0057] A graphene substrate is selected, and a zinc oxide film is deposited on the graphene substrate by magnetron sputtering technology, and then a water bath solution is prepared, wherein the water bath solution includes 18 parts of copper acetate, 36 parts of zinc nitrate, 10 parts of silver nitrate and 36 parts of ammonia water, and the graphene substrate with zinc oxide deposited is placed in the water bath solution and heated at a constant temperature for 3 hours, and the temperature is kept constant at 90° C. After the heating is completed, silver / zinc oxide / copper oxide nano-objects are deposited on the zinc oxide, and the graphene substrate is taken out, and then rinsed with deionized water, and naturally dried and cooled to room temperature, and metallic silver is used as an electrode, and the first metallic silver is connected to the zinc oxide film, and the second metallic silver is connected to the silver / zinc oxide / copper oxide nano-object, and the production of the carbon dioxide sensor is completed;

[0058] Step 2: Making a waterproof and breathable protective cover

[0059] 9 parts of styrene-butadiene-styrene block copolymer, 68 parts of oxolane, 22 parts of N,N-dimethylformamide and 0.02 parts of lithium chloride are selected by weight, and the oxolane and N,N-dimethylformamide are first added into a blender and uniformly mixed to form a primary mixed solution, and then the styrene-butadiene-styrene block copolymer is added into the primary mixed solution, and the stirring is continued for 2 hours to make it uniformly mixed, and then the lithium chloride is added and stirred for 30 minutes. After uniform mixing, a final mixed solution is formed; a spinning machine is used to spin the final mixed solution; The mixed solution is spun, and the spun fibers are woven into a spinning membrane by a weaving machine; an appropriate amount of aminomethane buffer solution containing dopamine is selected, and the spinning membrane is immersed in the aminomethane buffer solution containing dopamine, and after immersion for 2.5 hours, it is dried to form a dopamine spinning membrane, and then the dopamine spinning membrane is immersed in an ethanol solution containing silica particles, and after immersion for 1 hour, it is naturally dried to form a waterproof and breathable membrane; a plastic protective plate with a plurality of through holes is selected, and the waterproof and breathable membrane is pasted on the plastic protective plate to produce a waterproof and breathable protective cover;

[0060] Step 3: Making a waterproof and wear-resistant container bag

[0061] A transparent plastic container bag is selected, wherein the polyethylene plastic material is selected, a 50 μm thick polyethylene terephthalate layer is sprayed on the surface, and then a 20 μm thick zinc oxide-polytetrafluoroethylene layer is deposited on the polyethylene terephthalate layer by magnetron sputtering technology, and then nano-silicon dioxide, graphene and polytetrafluoroethylene are deposited on the zinc oxide-polytetrafluoroethylene layer by magnetron sputtering technology to form an 80 μm coating, thereby preparing a final waterproof and wear-resistant container bag;

[0062] Step 4: Assembly of the CO2 Calibrator

[0063] Use the carbon dioxide sensor of step 1, select the waterproof and breathable protective cover of step 2, select the container bag of step 3, select the air inlet, air outlet, bottom shell, upper cover, control circuit board, carbon dioxide sensor, ventilation mechanism, waterproof and breathable protective cover, display and wire interface, the air inlet and air outlet are respectively arranged on the container bag, the calibrator is installed in the container bag, the wire interface is installed on the container bag, and the wiring terminal of the calibrator is electrically connected to the outside through the wire interface;

[0064] The upper cover is mounted on the bottom shell, the bottom shell and the upper cover form a cavity, a control circuit board and a carbon dioxide sensor are arranged in the cavity; the protective cover is arranged in the cavity, a control circuit board and a carbon dioxide sensor are arranged in the protective cover, a ventilation mechanism is mounted on the bottom shell and the upper cover, the ventilation mechanism is used to connect the environment of the container bag with the environment in the cavity, and the control end of the carbon dioxide sensor is electrically connected to the control end of the control circuit board; the container bag is a transparent plastic container bag; the display is mounted on the upper cover, and the control end of the display is electrically connected to the control end of the control circuit board;

[0065] Step 5: Operation of the CO2 Calibrator

[0066] Select the carbon dioxide calibrator in step 4, release all the air in the container bag through the one-way valve at the outlet, close the outlet, and then inject carbon dioxide from the inlet. Connect the power to the control circuit board, start the control circuit board, and use the carbon dioxide sensor to collect carbon dioxide data. Based on the injected gas, check whether the carbon dioxide probe meets the accuracy requirements of the equipment. If the result does not meet the requirements, the calibrator needs to be calibrated by changing the injected gas to nitrogen. After injection, perform zero value calibration on the calibrator, and then replace nitrogen with carbon dioxide. Verify the accuracy of the carbon dioxide probe to complete the operation of the carbon dioxide calibrator.

[0067] Detect it, Figure 5 This is the SEM image of the waterproof breathable membrane. It can be seen that the silica nanoparticles are evenly distributed on the waterproof breathable membrane. Figure 6 The SEM image of the graphene substrate with zinc oxide shows that zinc oxide nanoparticles are evenly distributed on its surface, which can help the formation of silver / zinc oxide / copper oxide nanoparticles; Figure 7 This is the SEM image of the graphene carbon dioxide sensor. It can be seen that many uniform nanosheets and nanoflowers are formed on its surface, which have more contact area with carbon dioxide gas; Figure 8 The contact angle diagram of the waterproof and breathable protective cover shows that its contact angle is 155°, which is highly hydrophobic. Fig. 9 This is a schematic diagram of the contact angle of the waterproof and wear-resistant container bag. It can be seen that its contact angle is 128°, which has great hydrophobicity.

[0068] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel carbon dioxide calibrator, characterized in that: The carbon dioxide calibrator comprises: a container bag, an air inlet, an air outlet, a calibrator and a wire interface, wherein the air inlet and the air outlet are respectively arranged on the container bag, the calibrator is installed in the container bag, the wire interface is installed on the container bag, and the connection terminal of the calibrator is electrically connected to the outside through the wire interface; The calibrator comprises a bottom shell, an upper cover, a control circuit board, a carbon dioxide sensor and a ventilation mechanism, wherein the upper cover is mounted on the bottom shell, the bottom shell and the upper cover enclose a chamber, the control circuit board and the carbon dioxide sensor are arranged in the chamber, the ventilation mechanism is mounted on the bottom shell and the upper cover, the ventilation mechanism is used to connect the environment of the container bag with the environment in the chamber, and the control end of the carbon dioxide sensor is electrically connected to the control end of the control circuit board; Wherein, the container bag is a transparent plastic container bag.

2. A novel carbon dioxide calibrator according to claim 1, characterized in that: The calibrator further comprises a protective cover, which is arranged in the device cavity, and the control circuit board and the carbon dioxide sensor are arranged in the protective cover.

3. A novel carbon dioxide calibrator according to claim 2, characterized in that: The protective cover is a waterproof and breathable protective cover.

4. A novel carbon dioxide calibrator according to claim 1, characterized in that: The carbon dioxide sensor is a graphene carbon dioxide sensor.

5. A novel carbon dioxide calibrator according to claim 1, characterized in that: The calibrator further comprises a display, which is mounted on the upper cover, and a control end of the display is electrically connected to a control end of the control circuit board.

6. A novel carbon dioxide calibrator according to claim 5, characterized in that: The ventilation mechanism comprises an annular air passage, which is arranged on the bottom shell and the upper cover, with an air inlet of the annular air passage facing the air inlet end and an air outlet of the annular passage facing the air outlet end.

7. A novel carbon dioxide calibrator according to claim 6, characterized in that: At least two annular air passages are selected.

8. A novel carbon dioxide calibrator according to claim 1, characterized in that: A one-way air outlet valve is arranged on the air outlet end.

9. A novel carbon dioxide calibrator according to claim 1, characterized in that: The bottom shell, the upper cover and the ventilation mechanism are all made of plastic.

10. A novel method for controlling a carbon dioxide calibrator, characterized in that: The control method steps are as follows: Step 1: Making a CO2 Sensor A graphene substrate is selected, and a zinc oxide film is deposited on the graphene substrate by magnetron sputtering technology, and then a water bath solution is prepared, wherein the water bath solution includes 15-20 parts of copper acetate, 35-40 parts of zinc nitrate, 5-10 parts of silver nitrate and 30-45 parts of ammonia water, and the graphene substrate with zinc oxide deposited is placed in the water bath solution and heated at a constant temperature for 3 hours, and the temperature is kept constant at 90° C. After the heating is completed, silver / zinc oxide / copper oxide nano-objects are deposited on the zinc oxide, and the graphene substrate is taken out, and then rinsed with deionized water, and naturally dried and cooled to room temperature, and metallic silver is used as an electrode, and the first metallic silver is connected to the zinc oxide film, and the second metallic silver is connected to the silver / zinc oxide / copper oxide nano-object, and the production of the carbon dioxide sensor is completed; Step 2: Making a waterproof and breathable protective cover 8-9 parts of styrene-butadiene-styrene block copolymer, 65-68 parts of oxolane, 22-23 parts of N,N-dimethylformamide and 0.01-0.04 parts of lithium chloride are selected by weight, and the oxolane and N,N-dimethylformamide are first added into a blender and mixed uniformly to form a primary mixed solution, and then the styrene-butadiene-styrene block copolymer is added into the primary mixed solution, and stirring is continued for 2 hours to make it uniformly mixed, and then lithium chloride is added and stirred for 30 minutes. After uniform mixing, a final mixed solution is formed; The final mixed solution is spun by a spinning machine, and the spun fibers are woven into a spinning membrane by a weaving machine; an appropriate amount of aminomethane buffer solution containing dopamine is selected, and the spinning membrane is immersed in the aminomethane buffer solution containing dopamine, and after immersion for 2.5 hours, it is dried to form a dopamine spinning membrane, and then the dopamine spinning membrane is immersed in an ethanol solution containing silica particles, and after immersion for 1 hour, it is naturally dried to form a waterproof and breathable membrane; a plastic protective plate with a plurality of through holes is selected, and the waterproof and breathable membrane is pasted on the plastic protective plate to produce a waterproof and breathable protective cover; Step 3: Making a waterproof and wear-resistant container bag A transparent plastic container bag is selected, a polyethylene terephthalate layer is sprayed on the surface thereof, and then a zinc oxide-polytetrafluoroethylene layer is deposited on the polyethylene terephthalate layer by magnetron sputtering technology, and then nano-silicon dioxide, graphene and polytetrafluoroethylene are deposited on the zinc oxide-polytetrafluoroethylene layer by magnetron sputtering technology to prepare a final waterproof and wear-resistant container bag; Step 4: Assembly of the CO2 Calibrator Use the carbon dioxide sensor of step 1, select the waterproof and breathable protective cover of step 2, select the container bag of step 3, select the air inlet, air outlet, bottom shell, upper cover, control circuit board, carbon dioxide sensor, ventilation mechanism, waterproof and breathable protective cover, display and wire interface, the air inlet and air outlet are respectively arranged on the container bag, the calibrator is installed in the container bag, the wire interface is installed on the container bag, and the wiring terminal of the calibrator is electrically connected to the outside through the wire interface; The upper cover is mounted on the bottom shell, the bottom shell and the upper cover form a cavity, a control circuit board and a carbon dioxide sensor are arranged in the cavity; the protective cover is arranged in the cavity, a control circuit board and a carbon dioxide sensor are arranged in the protective cover, a ventilation mechanism is mounted on the bottom shell and the upper cover, the ventilation mechanism is used to connect the environment of the container bag with the environment in the cavity, and the control end of the carbon dioxide sensor is electrically connected to the control end of the control circuit board; the container bag is a transparent plastic container bag; the display is mounted on the upper cover, and the control end of the display is electrically connected to the control end of the control circuit board; Step 5: Operation of the CO2 Calibrator Select the carbon dioxide calibrator in step 4, release all the air in the container bag through the one-way valve at the outlet, close the outlet, and then inject carbon dioxide from the inlet. Connect the power to the control circuit board, start the control circuit board, and use the carbon dioxide sensor to collect carbon dioxide data. Based on the injected gas, check whether the carbon dioxide probe meets the accuracy requirements of the equipment. If the result does not meet the requirements, the calibrator needs to be calibrated by changing the injected gas to nitrogen. After injection, perform zero value calibration on the calibrator, and then replace nitrogen with carbon dioxide. Verify the accuracy of the carbon dioxide probe to complete the operation of the carbon dioxide calibrator.

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