CN212228801U - Calibration device for formaldehyde gas sensor and detection instrument - Google Patents
Calibration device for formaldehyde gas sensor and detection instrument Download PDFInfo
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- CN212228801U CN212228801U CN202020128604.5U CN202020128604U CN212228801U CN 212228801 U CN212228801 U CN 212228801U CN 202020128604 U CN202020128604 U CN 202020128604U CN 212228801 U CN212228801 U CN 212228801U
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Abstract
The utility model relates to a calibrating device of formaldehyde gas sensor and detecting instrument, including the casing, by calibration sensor, formaldehyde gas reference sensor, circulating gas pump, gas flow controller, liquid container, main control system. The control host can read the concentration of the formaldehyde gas in the calibration container shell collected by the formaldehyde gas reference sensor in real time, and adjust the flow controller and the gas valve to realize the allocation of the specified formaldehyde concentration gas environment. The device can realize low-cost formaldehyde distribution, reduces formaldehyde adhesion, ensures uniform concentration distribution of formaldehyde gas in the calibration container, and realizes automatic distribution in an electric control mode.
Description
Technical Field
The utility model relates to an electrochemistry detects relevant instrument field, concretely relates to calibration device of formaldehyde gas sensor and detecting instrument.
Background
Among indoor air pollution, formaldehyde is a recognized potential carcinogen in the world. At present, formaldehyde in indoor air mainly comes from decorative materials such as composite floors, medium density boards, wall coatings, chemical fiber carpets and the like used in home decoration, and adhesives and facing materials which take urea resin as a main component. Cancer is induced by long-term exposure to formaldehyde gas, and therefore, the use of formaldehyde gas sensors to detect the formaldehyde content in the air is a popular method today.
Various errors always occur in the production process of the existing formaldehyde sensor and related equipment, and people need to calibrate the sensor and the related equipment in order to ensure that the sensor and the related equipment are qualified and yield. In the apparatus described in patent CN201721829371.6, the gas calibration equipment currently uses standard gas as the gas source, uses buffer gas for dilution, and achieves the target gas concentration by controlling the throughput of gas injection into the calibration container. When the device is used for calibrating the formaldehyde gas sensor, the following defects exist: the formaldehyde standard gas has high cost and is uneconomical; the formaldehyde is easy to adhere in the calibration container, and the concentration distribution is not uniform; and manual gas distribution is low in efficiency and accuracy.
Therefore, a device capable of rapidly and automatically calibrating the formaldehyde sensor and the detecting instrument is required to be developed so as to meet the requirement of the existing formaldehyde detection.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a calibration device of formaldehyde gas sensor and detecting instrument realizes low-cost formaldehyde distribution, reduces formaldehyde and adheres to the formaldehyde gas concentration distribution in the guarantee calibration container even to realize automatic distribution through the electric control mode.
The utility model provides a calibrating device of formaldehyde gas sensor and detecting instrument to solve the technical problem that prior art exists.
The technical solution of the utility model is to provide a calibration device for formaldehyde gas sensor and detecting instrument, comprising a hollow sealed shell, wherein a calibrated sensor is placed in the shell;
the shell is provided with two air inlets which are respectively connected with buffer gas and formaldehyde gas;
the shell comprises a circulating air pump, an air inlet of the circulating air pump is arranged below the shell, and an air outlet of the circulating air pump is arranged above the shell;
the shell is provided with an air outlet which is connected with a scavenging pump, and the air outlet of the scavenging pump is connected with a waste gas absorption device;
and a formaldehyde gas reference sensor is also arranged in the shell and used for monitoring the concentration of the formaldehyde gas in the shell as a reference.
Further, the device also comprises a gas flow controller which is connected with the formaldehyde gas pipeline;
the gas input end of the gas flow controller is connected to a buffer gas source;
the buffer gas source has another branch connected to the housing.
Furthermore, the device also comprises a liquid container in which the formaldehyde solution is arranged;
the liquid container comprises a gas input pipe and a gas output pipe; one end of the gas output pipe is positioned above the formaldehyde solution, and the other end of the gas output pipe is connected with the shell; one end of the gas input pipe is positioned in the formaldehyde solution, and the other end of the gas input pipe is connected with the gas flow controller;
and the gas output end of the gas flow controller is connected with the shell.
Furthermore, the device also comprises a control host, wherein control signals of the electric devices such as the formaldehyde gas reference sensor, the gas flow controller, the gas pump and the like are connected with the control host.
Further, gas valves are arranged on the gas inlet and the gas outlet.
This patent has designed a formaldehyde gas sensor and detecting instrument's calibrating device, realizes low-cost formaldehyde distribution, reduces formaldehyde and adheres to the even formaldehyde gas concentration distribution in the guarantee calibration container to realize automatic distribution through the electric control mode.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the calibration device of the formaldehyde gas sensor and the detecting instrument designed by the patent adopts formaldehyde solution as a target gas source generator, adopts compressed air as a buffer gas source and is low in cost.
(2) The calibration container casing of the calibration device of the formaldehyde gas sensor and the detecting instrument designed by the patent is provided with an external circulating air pump, so that gas circulation is formed, the adhesion of formaldehyde gas is reduced, and the distribution uniformity of gas concentration is improved.
(3) The control host computer of the formaldehyde gas sensor and the calibrating device of the detecting instrument designed by the patent acquires the formaldehyde concentration value in the calibrating container from the reference sensor, controls the gas valve and the flow controller, and realizes automatic gas distribution.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic diagram of the overall design of the calibration device for formaldehyde gas sensor and detection instrument designed in this patent.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, and are only used for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.
Referring to the attached drawing 1, the embodiment provides a calibration device for a formaldehyde gas sensor and a detection instrument, which comprises a hollow sealed shell as a calibration container, a formaldehyde solution as a formaldehyde gas generator is preset in a liquid container, and an air compressor generates compressed air as buffer gas.
The air compressor is connected with the pressure reducing valve, the pressure reducing valve is adjusted, and compressed air is adjusted to 0.3 MPa.
The air outlet of the pressure reducing valve is connected with a filter through a gas pipeline to filter solid particles, oil mist and moisture in the air.
The gas outlet pipeline of the filter is divided into two parallel branches, wherein one branch is a buffer gas branch which is connected to the calibration container shell through a gas valve and is used as a buffer gas source; the other branch is a formaldehyde gas branch which is connected to a flow controller and used as a formaldehyde gas source.
The flow controller can adopt a gas mass flow controller, the flow rate of gas passing through the flow controller can be configured through the host, and the total flow of the passing gas is counted in real time; the flow controller on the formaldehyde gas pipeline selects the 10mL/min range.
The device comprises a liquid container, wherein a formaldehyde solution is preset in the container; the mass fraction ratio of methanol solute to water solvent in the formaldehyde solution is as follows: (8% to 14%).
The liquid container comprises a gas input pipe and a gas output pipe; one end of the gas output pipe is positioned above the formaldehyde solution, and the other end of the gas output pipe is connected with the calibration container shell; one end of the gas input pipe is positioned in the formaldehyde solution, and the other end of the gas input pipe is connected with a gas outlet of the flow controller.
The liquid container gas output pipe is connected to the calibration container shell through a valve.
The calibration container shell is provided with an external circulating air pump, an air inlet of the air pump is arranged below the shell, and an air outlet of the air pump is arranged above the shell; the formaldehyde has a slightly higher specific gravity than air, flows from top to bottom in the container, and forms gas circulation through the external circulating gas pump, so that the gas adhesion is reduced, and the gas concentration distribution uniformity is improved.
The calibration container shell is provided with an exhaust port, the exhaust port is provided with a valve, the outside of the calibration container shell is provided with a connecting evacuator, after the experiment is finished, a formaldehyde air passage valve is closed, a compressed air valve is opened, the exhaust port valve is opened, the evacuator is started, formaldehyde gas in the container is evacuated, and the formaldehyde gas is absorbed by a waste gas absorption device.
A reference formaldehyde gas sensor is arranged in the calibration container shell, and the concentration of formaldehyde gas in the container is monitored in real time.
The calibration container shell is a closed container, the measured formaldehyde sensor is placed in the container, after gas distribution is completed, the valve is closed, and formaldehyde gas prepared in the container is not leaked, so that stable concentration is maintained; and the measured formaldehyde sensor refers to the concentration monitoring value of the reference sensor to realize the calibration of the value.
The embodiment also comprises a control host, wherein control signals of the electric devices such as the formaldehyde gas reference sensor, the flow controller, the gas valve, the gas pump and the like are connected with the control host; the control host reads the concentration of the formaldehyde gas in the calibration container shell collected by the formaldehyde gas reference sensor in real time, and adjusts the flow controller and the gas valve to realize the allocation of the specified formaldehyde concentration gas environment.
The above-mentioned specific embodiments have described the technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned is only the most preferred embodiments of the present invention, and is not used to limit the present invention, any modifications, supplements, equivalent replacements, etc. made within the principle scope of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a calibration device of formaldehyde gas sensor and detecting instrument which characterized in that: the calibration device comprises a hollow sealed shell, wherein a calibrated sensor is placed in the shell;
the shell is provided with two air inlets which are respectively connected with buffer gas and formaldehyde gas;
the shell comprises a circulating air pump, an air inlet of the circulating air pump is arranged below the shell, and an air outlet of the circulating air pump is arranged above the shell;
the shell is provided with an air outlet which is connected with a scavenging pump, and the air outlet of the scavenging pump is connected with a waste gas absorption device;
and a formaldehyde gas reference sensor is also arranged in the shell and used for monitoring the concentration of the formaldehyde gas in the shell as a reference.
2. The calibration device for formaldehyde gas sensor and detecting instrument as claimed in claim 1, wherein: the device also comprises a gas flow controller which is connected with the formaldehyde gas pipeline;
the gas input end of the gas flow controller is connected to a buffer gas source;
the buffer gas source has another branch connected to the housing.
3. The calibration device for formaldehyde gas sensor and detecting instrument as claimed in claim 2, wherein: the device also comprises a liquid container, wherein formaldehyde solution is contained in the liquid container;
the liquid container comprises a gas input pipe and a gas output pipe; one end of the gas output pipe is positioned above the formaldehyde solution, and the other end of the gas output pipe is connected with the shell; one end of the gas input pipe is positioned in the formaldehyde solution, and the other end of the gas input pipe is connected with the gas flow controller;
and the gas output end of the gas flow controller is connected with the shell.
4. The calibration device for formaldehyde gas sensor and detecting instrument as claimed in claim 2, wherein: the device also comprises a control host, wherein control signals of the formaldehyde gas reference sensor, the gas flow controller, the gas pump and other electric devices are connected with the control host.
5. The calibration device for formaldehyde gas sensor and detecting instrument as claimed in claim 1, wherein: and the gas inlet and the gas outlet are provided with gas valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020128604.5U CN212228801U (en) | 2020-01-19 | 2020-01-19 | Calibration device for formaldehyde gas sensor and detection instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020128604.5U CN212228801U (en) | 2020-01-19 | 2020-01-19 | Calibration device for formaldehyde gas sensor and detection instrument |
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| Publication Number | Publication Date |
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| CN212228801U true CN212228801U (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020128604.5U Active CN212228801U (en) | 2020-01-19 | 2020-01-19 | Calibration device for formaldehyde gas sensor and detection instrument |
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| Country | Link |
|---|---|
| CN (1) | CN212228801U (en) |
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- 2020-01-19 CN CN202020128604.5U patent/CN212228801U/en active Active
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