CN209803094U - A calibrating device for diffusion formula formaldehyde detector - Google Patents
A calibrating device for diffusion formula formaldehyde detector Download PDFInfo
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- CN209803094U CN209803094U CN201920370934.2U CN201920370934U CN209803094U CN 209803094 U CN209803094 U CN 209803094U CN 201920370934 U CN201920370934 U CN 201920370934U CN 209803094 U CN209803094 U CN 209803094U
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Abstract
The utility model belongs to the technical field of instrument verification, and discloses a calibrating device for a diffusion type formaldehyde detector, which comprises a calibrating cabin, one side of the calibration cabin is provided with an air inlet, the other side is provided with an air outlet, the interior is provided with a formaldehyde detector to be calibrated and a vacuum meter, the gas inlet is communicated with a gas generating device which is used for generating multi-component formaldehyde standard gas, which is connected with a standard device used for detecting the concentration of multi-component formaldehyde standard gas generated by the gas generating device, the detection precision is higher than that of a formaldehyde detector to be calibrated, the air outlet is communicated with a vacuum pump and a formaldehyde absorption tank, the vacuum pump is used for exhausting air from the calibration cabin, the vacuum meter is used for monitoring the corresponding pressure value when the air in the calibration cabin is exhausted and is not exhausted at all, and the formaldehyde absorption tank is used for storing liquid capable of absorbing formaldehyde.
Description
Technical Field
The utility model relates to a technical field of instrument examination especially relates to a calibrating device for diffusion formula formaldehyde detector.
Background
With the development of environmental protection industry, more and more enterprises and residents pay attention to living and working environments, people pay more and more attention to decoration materials at present, the environment of living places increasingly becomes a key attention object of people, the market sales of portable formaldehyde detectors are higher and higher, it is important that the data tested by the formaldehyde detectors are inaccurate, however, most of more and more domestic appliances researched and developed at present are diffusion type, have no sampling ports, have different test results, are several times or even more than ten times higher than the limit value requirements of relevant national standards such as GB/T18883-2002, and cause certain panic to people, so the metering calibration of the diffusion type appliances is particularly important.
Standard gas of the multi-component formaldehyde standard gas generating device matched with the national metrological verification rule JJJG 1022-2016 is connected out through a pipeline, and a formaldehyde detector with a sampling port and a diffusion cover can be used for calibration. The formaldehyde detector without the diffusion cover is conveniently and accurately calibrated, and the rear end of the formaldehyde standard gas is connected into a calibration cabin, so that the diffusion type formaldehyde detector, the formaldehyde gas monitor, the alarm and the like can be conveniently calibrated. Because the calibration cabin is large in size, the time for directly introducing the formaldehyde standard gas into the cabin body by virtue of the formaldehyde standard gas pipeline to evacuate the air in the cabin body is long, and whether the air in the calibration cabin is evacuated or not cannot be determined, if the air in the calibration cabin is not evacuated, the concentration of the formaldehyde gas in the calibration cabin is not equal to the concentration of the formaldehyde standard gas emitted from the multi-component formaldehyde standard gas generating device, and the calibration accuracy is reduced.
Therefore, in order to overcome the difficulties that most diffusion type formaldehyde testers in the market have no diffusion cover or pipeline connection is difficult due to the fact that the diffusion cover is five-door, a calibration method suitable for the diffusion type formaldehyde tester is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a calibrating device for diffusion formula formaldehyde detector has solved the accuracy of current formaldehyde detector calibration not high, the poor scheduling problem of commonality.
The utility model discloses the following technical scheme of accessible realizes:
The utility model provides a calibrating device for diffusion formula formaldehyde detector, includes the calibration cabin, one side of calibration cabin is provided with the air inlet, and the opposite side is provided with the gas outlet, and inside is provided with remains calibration formaldehyde detector, vacuum table, air inlet and gas generating device intercommunication, gas generating device is used for producing multicomponent formaldehyde standard gas, and it links to each other with the etalon, the etalon is used for detecting the concentration of multicomponent formaldehyde standard gas that gas generating device produced, and its detection precision is higher than treating calibration formaldehyde detector, gas outlet and vacuum pump, formaldehyde absorption tank intercommunication, the vacuum pump is used for bleeding from the calibration cabin, the vacuum table is used for monitoring the inside gas of calibration cabin and has been taken out and the corresponding pressure value when not being taken out completely, the formaldehyde absorption tank is used for the storage can absorb the liquid of formaldehyde.
further, the pressure value is set to be the pressure value detected by the vacuum meter after the time required for exhausting the gas in the calibration cabin is calculated according to the volume of the calibration cabin and the air exhausting speed of the vacuum pump and the air exhausting time is exhausted by the vacuum pump.
Further, the position of the air outlet is higher than that of the air inlet, and the formaldehyde detector to be calibrated is arranged at the bottom of the calibration cabin.
Further, a first switch is arranged on a pipeline communicated with the air inlet of the gas generating device, and a second switch is also arranged on a pipeline communicated with the air outlet of the vacuum pump, the formaldehyde absorption tank and the air outlet.
Further, the gas outlet still communicates with the formaldehyde monitor, the formaldehyde monitor is used for monitoring the formaldehyde gas concentration of the gas outlet in calibration cabin.
The utility model discloses profitable technological effect lies in:
By means of the cooperation of the vacuum pump and the vacuum meter, the air exhaust rate of the vacuum pump and the volume of the calibration cabin are combined, the fact that air inside the calibration cabin can be exhausted completely is guaranteed, the fact that multi-component formaldehyde standard gas generated by the gas generating device can be filled into the calibration cabin in a pure mode, the concentration of the multi-component formaldehyde standard gas in the calibration cabin is the same as that of the multi-component formaldehyde standard gas generated by the gas generating device is guaranteed, the gas outlet of the calibration cabin is communicated with the formaldehyde absorption tank, the gas inlet and the gas outlet are opened simultaneously, the multi-component formaldehyde standard gas is continuously introduced into the calibration cabin and keeps dynamic circulation, the concentration of the formaldehyde standard gas in the calibration cabin is continuously stable, and reliable technical guarantee is provided for calibration of the diffusion type formaldehyde gas. Simultaneously, the inside absorption liquid of formaldehyde absorption jar can absorb the formaldehyde that the gas outlet released better, reduces the pollution to the environment, uses the utility model discloses a calibrating device can calibrate all diffusion formula formaldehyde tester on the market, provides service for the customer better, and the commonality is high, easily uses widely.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
The device comprises a calibration cabin, an air inlet 11, an air outlet 12, a formaldehyde detector to be calibrated 2, a vacuum meter 3, a gas generating device 4, a vacuum pump 5, a formaldehyde absorption tank 6, a temperature and humidity sensor 7 and a drying agent 8.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided in connection with the accompanying drawings.
as shown in fig. 1, the utility model provides a calibrating device for a diffusion formaldehyde detector, which comprises a calibrating cabin 1, one side of the calibration cabin 1 is provided with an air inlet 11, the other side is provided with an air outlet 12, the formaldehyde detector 2 to be calibrated and the vacuum meter 3 are arranged inside the calibration cabin, the gas inlet 11 is communicated with a gas generating device 4, the gas generating device 4 is used for generating multi-component formaldehyde standard gas, which is connected with a standard device used for detecting the concentration of the multi-component formaldehyde standard gas generated by the gas generating device 4, the detection precision is higher than that of the formaldehyde detector 2 to be calibrated, the air outlet 12 is communicated with the vacuum pump 5 and the formaldehyde absorption tank 6, the vacuum pump 5 is used for pumping air from the calibration cabin 1, the vacuum meter 3 is used for monitoring the corresponding pressure value when the air in the calibration cabin 1 is pumped out and is not pumped out at all, and the formaldehyde absorption tank 6 is used for storing liquid capable of absorbing formaldehyde.
The pressure value when the gas in the calibration cabin 1 is completely pumped out can be calculated according to the volume of the calibration cabin 1 and the pumping speed of the vacuum pump 5, the time required for pumping out the gas in the calibration cabin 1 is calculated firstly, then the vacuum pump 5 is used for pumping out the gas, after the time, the gas in the calibration cabin 1 is equivalently pumped out, and the pressure value detected by the vacuum meter 3 is measured at the moment. Before the standard gas is pumped in, the calibration chamber is vacuumized by a vacuum pump to be 41.73kPa, for example, the volume of the calibration chamber 1 is 10L, before the air pumping is carried out, the detection value on the vacuum table 3 is 0kPa, while the air pumping speed of the vacuum pump 5 is 0.5ml/min, the time for pumping the chamber body of the calibration chamber 1 to be vacuumized is 20 minutes, after 20 minutes, the gas in the calibration chamber 1 is equivalently pumped out, and the detection value displayed on the vacuum table 3 on the chamber body of the calibration chamber 1 is seen to be 41.73 kPa. Therefore, during calibration, the vacuum pump 5 can be used for pumping the calibration cabin 1, and the gas in the calibration cabin 1 can be judged to be pumped up until the detection value of the vacuum meter 3 reaches the pressure value, so that the multi-component formaldehyde standard gas generated by the gas generating device 4 is filled into the calibration cabin 1 in a pure manner, and no other gas impurities exist.
Because the concentration of the multi-component formaldehyde standard gas generated by the gas generating device 4 can not be continuously stable and can slightly change, and meanwhile, the formaldehyde gas is easy to attenuate along with the passage of time, in order to improve the calibration precision, the gas in the calibration cabin 1 can be kept dynamically stable, the position of the gas outlet 12 is higher than that of the gas inlet 11, the formaldehyde detector 2 to be calibrated is arranged at the bottom of the calibration cabin 1, and after the multi-component formaldehyde standard gas is filled in the calibration cabin 1, the gas inlet 11 and the gas outlet 12 are simultaneously opened to enable the multi-component formaldehyde standard gas in the calibration cabin to be in a dynamic circulation state, so that the formaldehyde detector 2 to be calibrated is always in the multi-component formaldehyde standard gas kept dynamically stable.
This gas outlet 12 still communicates with the formaldehyde monitor, this formaldehyde analysis appearance is used for monitoring the formaldehyde gas concentration of gas outlet 12 of calibration cabin 1, its detection precision can be the same with the etalon, like this, through the detected value of comparison formaldehyde analysis appearance and etalon, can recheck and judge whether the gas in the calibration cabin 1 inside has been taken out, under the condition that keeps the dynamic circulation of the multicomponent formaldehyde standard gas in calibration cabin 1 inside, if the detected value difference between them is very big, it has not been taken out completely to show that the inside gaseous impurity of calibration cabin 1 is not taken out completely, can continue to aerify to the inside of calibration cabin 1 through air inlet 11, slowly discharge gaseous impurity, until the detected value between them is unanimous.
For convenient operation, a first switch is arranged on a pipeline of the gas generating device 4 communicated with the gas inlet 11, and second switches are also arranged on pipelines of the vacuum pump 5, the formaldehyde absorption tank 6 and the gas outlet 12.
The gas generating device 4 can adopt the multi-component formaldehyde standard gas generating device existing in the market, not only can generate formaldehyde gas, but also can detect the concentration of the formaldehyde gas, the detection precision of the gas generating device is measured and calibrated, the gas generating device has higher detection precision and can be used as a standard device, so that the special standard device for detecting the concentration of the formaldehyde gas generated by the gas generating device 4 can be saved, and a formaldehyde monitor for monitoring whether the gas in the calibration cabin 1 is consistent with the gas concentration displayed by the multi-component formaldehyde standard gas generating device can be adopted, such as a KY/DG formaldehyde monitor produced by Picaro manufacturers of drift-free trace gas monitors 1107 which has ultrahigh sensitivity, precision and accuracy and can monitor the concentration of the formaldehyde gas generated by the gas generating device 4 in real time, because the formaldehyde monitor has larger volume and is inconvenient to be directly placed in the calibration cabin 1, it may be connected directly to the air outlet 12. If the difference between the two detection values is large, it indicates that the impurity gas in the calibration chamber 1 is not completely pumped out, and the impurity gas can be continuously charged into the calibration chamber 1 through the gas inlet 11 under the condition of keeping the dynamic circulation of the gas in the calibration chamber 1, so as to be slowly discharged until the two detection values are consistent.
This calibration cabin 1 can adopt transparent material to make, is convenient for survey the detection numerical value of waiting to calibrate formaldehyde detector 2, and its inside humiture sensor 7 and drier 8 still are provided with, and the top or side can be put into mouth 9 by the switch instrument, are convenient for place and wait to calibrate formaldehyde detector, can keep multicomponent formaldehyde standard gas's aridity simultaneously, monitors the inside humiture of calibration cabin 1. The standard may also be placed inside the calibration chamber 1 so that it remains in the same environment as the formaldehyde detector 2 to be calibrated, further facilitating calibration.
When the calibration device of the utility model is used for calibration, firstly, the air inlet 11 is closed, the air outlet 12 is opened, the vacuum pump 5 is used for pumping air until the detection value of the vacuum meter 3 reaches the pressure value, and the pumping air is stopped; then, the gas outlet 11 is closed, the gas generating device 4 and the gas inlet 12 are opened, and the multi-component formaldehyde standard gas generated by the gas generating device 4 enters the calibration cabin 1 until the detection value of the vacuum meter 3 is zero; and finally, opening the gas outlet 11 to communicate with the formaldehyde absorption tank 6, keeping the multi-component formaldehyde standard gas inside the calibration cabin 1 to dynamically circulate, opening the standard, and comparing the detection values of the formaldehyde detector 2 to be calibrated and the standard at the moment to finish calibration.
In order to ensure that the gas in the calibration cabin 1 is completely pumped out by the vacuum pump 5, the gas outlet is opened to be communicated with the formaldehyde absorption tank, the multi-component formaldehyde standard gas in the calibration cabin is kept to dynamically circulate, after the standard device is opened, the detection values of the standard device and the formaldehyde monitor are compared, if the detection values are consistent, the detection values of the formaldehyde detector to be calibrated and the standard device are compared, otherwise, the calibration cabin waits for a period of time until the detection values of the formaldehyde detector to be calibrated and the detection values of the standard device are consistent, and the detection values of the formaldehyde detector to be calibrated and the standard device.
In order to improve the accuracy of calibration, the detection values of the formaldehyde detector to be calibrated and the standard can be recorded at equal time intervals, for example, the detection values of the formaldehyde detector 2 to be calibrated and the standard are recorded every 10 minutes for 6 times, the corresponding values are respectively 0.36 μmol/mol, 0.36 μmol/mol, 0.36 μmol/mol, 0.36 μmol/mol, 0.37 μmol/mol and 0.36 μmol/mol, and the repeatability is calculated to be 1.13%; 0.36. mu. mol/mol, 0.35. mu. mol/mol, 0.36. mu. mol/mol, calculated as 1.13% reproducibility.
The utility model discloses with the help of the cooperation of vacuum pump and vacuum meter, combine the speed of bleeding of vacuum pump and the volume in calibration cabin, ensure that the gas of calibration cabin inside can be accomplished and taken out, guarantee that calibration cabin inside can fill into the multicomponent formaldehyde standard gas that gas generator produced purely, thereby make multicomponent formaldehyde standard gas concentration be the same for the concentration of the multicomponent formaldehyde standard gas that gas generator sent in the calibration cabin, and the gas outlet and the formaldehyde absorption tank intercommunication in calibration cabin, open air inlet and gas outlet simultaneously, make multicomponent formaldehyde standard gas continuously let in the calibration cabin, keep dynamic balance, thereby formaldehyde standard gas concentration in the calibration cabin is continuously stable, calibration for diffusion formula formaldehyde gas detector provides reliable technical guarantee. Simultaneously, the inside absorption liquid of formaldehyde absorption jar can absorb the formaldehyde that the gas outlet released better, reduces the pollution to the environment, uses the utility model discloses a calibrating device can calibrate all diffusion formula formaldehyde tester on the market, provides service for the customer better, and the commonality is high, easily uses widely.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these embodiments are merely illustrative and various changes or modifications may be made therein without departing from the principles and spirit of the invention, and therefore, the scope of the invention is defined by the appended claims.
Claims (4)
1. the utility model provides a calibrating device for diffusion formula formaldehyde detector which characterized in that: including the calibration cabin, one side of calibration cabin is provided with the air inlet, and the opposite side is provided with the gas outlet, and inside is provided with remains calibration formaldehyde detector, vacuum table, air inlet and gas generating device intercommunication, gas generating device is used for producing multicomponent formaldehyde standard gas, and it links to each other with the etalon, the etalon is used for detecting the concentration of the multicomponent formaldehyde standard gas that gas generating device produced, and its detection precision is higher than waits to calibrate the formaldehyde detector, gas outlet and vacuum pump, formaldehyde absorption tank intercommunication, the vacuum pump is used for bleeding from the calibration cabin, the vacuum table is used for monitoring the gas of calibration cabin inside and has been taken out and not taken out the corresponding pressure value when taking out completely, the formaldehyde absorption tank is used for storing the liquid that can absorb formaldehyde.
2. The calibration device for the diffusive formaldehyde detector as in claim 1, wherein: the position of the air outlet is higher than that of the air inlet, and the formaldehyde detector to be calibrated is arranged at the bottom of the calibration cabin.
3. The calibration device for the diffusive formaldehyde detector as in claim 2, wherein: the pipeline that gas generator and air inlet communicate is provided with first switch, also all be provided with the second switch on the pipeline that vacuum pump, formaldehyde absorption jar and gas outlet communicate.
4. The calibration device for the diffusive formaldehyde detector as in claim 1, wherein: the gas outlet still communicates with the formaldehyde monitor, the formaldehyde monitor is used for monitoring the formaldehyde gas concentration of the gas outlet of calibration cabin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920370934.2U CN209803094U (en) | 2019-03-22 | 2019-03-22 | A calibrating device for diffusion formula formaldehyde detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920370934.2U CN209803094U (en) | 2019-03-22 | 2019-03-22 | A calibrating device for diffusion formula formaldehyde detector |
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| CN209803094U true CN209803094U (en) | 2019-12-17 |
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| CN201920370934.2U Active CN209803094U (en) | 2019-03-22 | 2019-03-22 | A calibrating device for diffusion formula formaldehyde detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991370A (en) * | 2019-03-22 | 2019-07-09 | 上海市计量测试技术研究院 | A kind of calibrating installation and method for diffusion type methylene oxide detecting instrument |
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2019
- 2019-03-22 CN CN201920370934.2U patent/CN209803094U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991370A (en) * | 2019-03-22 | 2019-07-09 | 上海市计量测试技术研究院 | A kind of calibrating installation and method for diffusion type methylene oxide detecting instrument |
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