CN211348202U - Simple and easy calibrating device of sea water carbon dioxide sensor - Google Patents
Simple and easy calibrating device of sea water carbon dioxide sensor Download PDFInfo
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- CN211348202U CN211348202U CN201922368433.3U CN201922368433U CN211348202U CN 211348202 U CN211348202 U CN 211348202U CN 201922368433 U CN201922368433 U CN 201922368433U CN 211348202 U CN211348202 U CN 211348202U
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Abstract
The utility model discloses a simple and easy calibrating device of sea water carbon dioxide sensor belongs to sensor calibrating device field. The main components of the device comprise a carbon dioxide supply device, a nitrogen supply device, a seawater carbon dioxide sensor to be calibrated, a calibrator and a desk-top carbon dioxide gas analyzer. The calibrator is a main body for calibration, and the carbon dioxide supply device and the nitrogen supply device are used for supplying gas into the calibrator through the pipeline to adjust the concentration of carbon dioxide in the calibrator. The gas inside the calibrator circulates through an externally connected gas pipe, and the function switching is realized through two three-way valves. The utility model is based on the gas environment indirect calibration mechanism, the water-gas mixing balance process with lower efficiency is omitted, and the calibration efficiency can be greatly improved; a high-precision desk-top carbon dioxide gas analyzer is used as a real-time monitoring basis for carbon dioxide concentration in a calibration test process, and is also used as a data source of a calibration reference value, so that the accuracy of the reference value is ensured.
Description
Technical Field
The utility model belongs to the technical field of the sensor calibration, concretely relates to simple and easy calibrating device of sea water carbon dioxide sensor.
Background
Accurate determination of the partial pressure of carbon dioxide in seawater is key to revealing the role of the ocean in global climate change. In general, the means for obtaining the partial pressure of carbon dioxide in seawater include two methods: continuous observation of the carbon dioxide during navigation and long-term observation of the fixed-point in-situ carbon dioxide sensor. The seawater carbon dioxide sensor based on the osmotic membrane technology can obtain a large amount of in-situ data, and is widely applied to global climate change of offshore areas, oceans, polar regions and other sea areas and ocean acidification research of coral reefs and other sensitive areas. In the long-term use process of the carbon dioxide sensor in the field, data drift inevitably occurs due to the influences of biological contamination, loss of self components and the like, so that the sensor calibration is required to be carried out regularly.
At present, the calibration device for the seawater carbon dioxide sensor which is commonly used internationally is quite large in size. The carbon dioxide sensor and the aerial carbon dioxide continuous observation system are usually arranged in the same large water pool, the water bodies measured by the carbon dioxide sensor and the aerial carbon dioxide continuous observation system are ensured to have the same carbon dioxide partial pressure, and the measured value of the aerial carbon dioxide continuous observation system is used as a reference value to calibrate the data of the carbon dioxide sensor. The method needs a huge test field, has the defect that the partial pressure of carbon dioxide in the water body cannot be changed rapidly, and is difficult to obtain the partial pressure value of carbon dioxide with more concentration gradients, so that the calibration efficiency is extremely low.
Therefore, a simple calibration device of the seawater carbon dioxide sensor is established, the calibration precision and the calibration efficiency are well balanced, and the important function of the seawater carbon dioxide sensor in marine scientific research activities is better played.
Disclosure of Invention
The to-be-solved technical problem of the utility model is to overcome current sea water carbon dioxide sensor calibrating device bulky, the inefficiency leads to the shortcoming that the rate of utilization is extremely low, provides a simple and easy calibrating device of sea water carbon dioxide sensor based on gas environment indirect calibration mechanism, possess certain calibration precision and higher calibration efficiency.
The utility model discloses the concrete technical scheme who adopts as follows:
a calibration device of a seawater carbon dioxide sensor comprises a carbon dioxide supply device, a nitrogen supply device, the seawater carbon dioxide sensor to be calibrated, a calibrator and a desk-top carbon dioxide gas analyzer; the calibrator is a sealed container, and the top of the calibrator is provided with a gas inlet and a gas outlet; the seawater carbon dioxide sensor to be calibrated is suspended and erected in the inner cavity of the calibrator through a fixing frame; the gas inlet is connected with the outlets of the two-in one-out three-way valve through a gas pipe, and the gas outlet is connected with the gas pump and the gas flowmeter in sequence through the gas pipe and then is connected to the detection inlet of the desk type carbon dioxide gas analyzer; the detection outlet of the desk-top carbon dioxide gas analyzer is connected to the inlets of the one-in two-out three-way valves through air pipes, the first outlet of the one-in two-out three-way valves is emptied, and the second outlet of the one-in two-out three-way valves is connected with the first inlet of the two-in one-out three-way valves; the carbon dioxide supply device comprises carbon dioxide storage equipment and a first pressure reducing valve which are sequentially connected through a carbon dioxide pipeline, and the nitrogen supply device comprises nitrogen storage equipment and a second pressure reducing valve which are sequentially connected through a nitrogen pipeline; and the tail ends of the carbon dioxide pipeline and the nitrogen pipeline are converged into an air supply pipeline and then are connected to a second inlet of the two-in one-out three-way valve, and the two-in one-out three-way valve is used for supplying air into the calibrator.
Preferably, the gas pipe passing through the gas inlet extends into the bottom of the inner cavity of the calibrator, and the gas pipe inlet passing through the gas outlet is positioned at the top of the inner cavity of the calibrator.
Preferably, the calibrator is a cylindrical housing sealed at positions other than the gas inlet and the gas outlet.
Preferably, the calibrator is made of organic glass.
Preferably, the carbon dioxide storage device is a carbon dioxide gas cylinder.
Preferably, the nitrogen storage device is a nitrogen gas cylinder.
Preferably, the gas inlet and the gas outlet are sealed with the connected gas pipe.
Preferably, the first pressure reducing valve and the second pressure reducing valve are both pressure reducing valves with adjustable opening degrees.
Compared with the prior art, the utility model, following beneficial effect has:
the simple device for calibrating the seawater carbon dioxide sensor is based on the indirect calibration mechanism of the gas environment, so that the water-gas mixing balance process with lower efficiency is omitted, and the calibration efficiency can be greatly improved; a high-precision desk-top carbon dioxide gas analyzer is used as a real-time monitoring basis for the concentration of carbon dioxide in the calibration test process, and is also used as a data source for calibrating a reference value, so that the accuracy of the reference value is ensured; the whole system is kept sealed in the test process, and the concentration of carbon dioxide is continuously measured through the circulating gas circuit, so that the concentration of carbon dioxide in the calibrator is kept constant in the calibration process.
Drawings
Fig. 1 is a schematic view of the present invention;
in the figure: the device comprises a seawater carbon dioxide sensor 1 to be calibrated, a calibrator 2, a carbon dioxide storage device 3, a nitrogen storage device 4, a first pressure reducing valve 5, a second pressure reducing valve 6, a two-in one-out three-way valve 7, a gas inlet/8, a gas outlet 9, a gas pump 10, a gas flowmeter 11, a desktop carbon dioxide gas analyzer 12 and a one-in two-out three-way valve 13.
Detailed Description
The invention will be further elucidated and described with reference to the drawings and embodiments. The utility model discloses in the technical characteristics of each embodiment under the prerequisite that does not conflict each other, all can carry out corresponding combination.
As shown in fig. 1, a simple calibrating device for a seawater carbon dioxide sensor provided in an embodiment of the present invention includes a carbon dioxide supply device, a nitrogen supply device, a seawater carbon dioxide sensor 1 to be calibrated, a calibrator 2, and a desktop carbon dioxide gas analyzer 12. Wherein the calibrator 2 is a main body for calibration, and the carbon dioxide supply means and the nitrogen supply means are used for supplying gas into the calibrator 2 through a pipe to adjust the concentration of carbon dioxide in the calibrator 2. The calibrator 2 is a cylindrical sealed container made of organic glass so as to facilitate the inspection of the inside. The seawater carbon dioxide sensor 1 to be calibrated is arranged in the calibrator 2, and the seawater carbon dioxide sensor 1 to be calibrated is suspended in the inner cavity of the calibrator 2 through a fixing frame. The gas in the calibrator 2 circulates through an externally connected gas pipe, and the function switching of the gas is realized through two three-way valves; one of the three-way valves is a two-inlet one-outlet three-way valve 7 which is provided with two inlets and one outlet, and one of the two inlets is communicated with the outlet; the other is a one-in two-out three-way valve 13 having an inlet and two outlets, one of which is in communication with the inlet.
The top of the calibrator 2 is provided with a gas inlet 8 and a gas outlet 9, and the whole calibrator 2 keeps sealed at the rest positions except the gas inlet 8 and the gas outlet 9. The gas inlet 8 is connected with the outlet of the two-in one-out three-way valve 7 through a gas pipe. The gas outlet 9 is connected with a gas pump 10 and a gas flowmeter 11 in sequence by a gas pipe and then is connected with a detection inlet of a desk-top carbon dioxide gas analyzer 12. The detection outlet of the desk-top carbon dioxide gas analyzer 12 is connected to the inlet of the one-in two-out three-way valve 13 through a gas pipe, the first outlet of the one-in two-out three-way valve 13 is emptied to be connected with the atmosphere, and the second outlet of the one-in two-out three-way valve 13 is connected with the first inlet of the two-in one-out three-way valve 7. The carbon dioxide supply device comprises a carbon dioxide storage device 3 and a first pressure reducing valve 5 which are sequentially connected through a carbon dioxide pipeline, and the nitrogen supply device comprises a nitrogen storage device 4 and a second pressure reducing valve 6 which are sequentially connected through a nitrogen pipeline. The tail ends of the carbon dioxide pipeline and the nitrogen pipeline are converged into a gas supply pipeline and then connected to a second inlet of the two-in one-out three-way valve 7, and the gas supply pipeline is used for supplying gas into the calibrator 2. In this embodiment, in order to try to replace the gas in the calibrator 2 with the gas supplied from the gas supply line, the gas pipe inserted at the gas inlet 8 should extend into the bottom of the cavity of the calibrator, while the gas pipe coming out at the gas outlet 9 should extend slightly into the top of the cavity of the calibrator. In this embodiment, the carbon dioxide storage device 3 is a carbon dioxide gas cylinder, and the nitrogen storage device 4 is a nitrogen gas cylinder, but other high-pressure gas storage devices may be adopted. In addition, all the gas pipes of the device are connected with the gas inlet 8 and the gas outlet 9 in a sealing mode.
The first pressure reducing valve 5 and the second pressure reducing valve 6 are both pressure reducing valves with adjustable opening degrees, and the proportion of carbon dioxide in the gas entering the calibrator 2 can be controlled by adjusting the opening degrees between the two pressure reducing valves, so that the concentration of the carbon dioxide in the calibrator 2 is changed.
The following uses a desk-top carbon dioxide gas analyzer 12 and a seawater carbon dioxide sensor 1 (carbon dioxide sensor to be calibrated) as an example to further explain the operation method of the device for calibrating the seawater carbon dioxide sensor, which specifically includes the following steps:
(1) connecting all parts of the device according to the figure 1, starting a table type carbon dioxide gas analyzer 12 and a seawater carbon dioxide sensor 1, and starting an operation program;
(2) adjusting and communicating the air inlet ends of the two-in one-out three-way valve 7 to the air supply pipeline, adjusting the air outlet ends of the one-in two-out three-way valve 13 to the emptying position, opening the air pump 10, and adjusting the gas flowmeter 11 to enable the pipeline gas flow rate to meet the detection requirement of the table-type carbon dioxide gas analyzer 12;
(3) according to the relation between the concentration of the carbon dioxide in the calibrator 2 and a control target value, the opening degrees of the first reducing valve 5 and the second reducing valve 6 are adjusted to further control the flow ratio of the two gases, so that the gas in the gas supply pipeline is mixed to obtain the proper concentration of the carbon dioxide, and the proper concentration of the carbon dioxide is introduced into the calibrator 2;
(4) continuously observing the reading of the desk-top carbon dioxide gas analyzer 12, when the measured value reaches 800 [ mu ] atm, closing the gas pipeline, and adjusting the gas outlet end of the one-in and two-out three-way valve 13 to be communicated with the first inlet of the two-in and one-out three-way valve 7, and the gas inlet end of the two-in and one-out three-way valve 7 to be communicated with the second outlet of the one-in and two-out three-way valve 13, so that the gas supply pipeline does not enter any more, the gas is internally circulated only between the calibrator 2 and the desk-top carbon dioxide gas analyzer 12, and the concentration of the carbon dioxide in the;
(5) simultaneously measuring the concentration of carbon dioxide in the calibrator 2 by using the desk-top carbon dioxide analyzer 12 and the seawater carbon dioxide sensor 1, and respectively recording synchronous detection values of the desk-top carbon dioxide analyzer 12 and the seawater carbon dioxide sensor 1;
(6) repeating the steps (2) to (5), and sequentially obtaining synchronous detection values of the desktop carbon dioxide gas analyzer 12 and the seawater carbon dioxide sensor 1 under the conditions that the carbon dioxide concentration in the calibrator 2 is 700, 600, 500, 400, 300 and 200 mu atm;
(7) the measurement value of the seawater carbon dioxide sensor 1 is calibrated using the measurement value of the desk-top carbon dioxide gas analyzer 12 as a reference value.
The above-mentioned embodiments are merely a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications can be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the mode of equivalent replacement or equivalent transformation fall within the protection scope of the utility model.
Claims (8)
1. A simple calibrating device for a seawater carbon dioxide sensor is characterized by comprising a carbon dioxide supply device, a nitrogen supply device, a seawater carbon dioxide sensor (1) to be calibrated, a calibrator (2) and a desk-top carbon dioxide gas analyzer (12); the calibrator (2) is a sealed container, and the top of the calibrator is provided with a gas inlet (8) and a gas outlet (9); the seawater carbon dioxide sensor (1) to be calibrated is suspended and erected in the inner cavity of the calibrator (2) through a fixing frame; the gas inlet (8) is connected with the outlets of the two-inlet one-outlet three-way valve (7) through gas pipes, and the gas outlet (9) is connected with a gas pump (10) and a gas flowmeter (11) in sequence through the gas pipes and then is connected to the detection inlet of a table-type carbon dioxide gas analyzer (12); a detection outlet of the desk type carbon dioxide gas analyzer (12) is connected to inlets of a first inlet and a second outlet three-way valves (13) through a gas pipe, a first outlet of the first inlet and the second outlet three-way valves (13) is emptied, and a second outlet of the first inlet and the second outlet three-way valves (13) is connected to a first inlet of the two inlet and one outlet three-way valves (7); the carbon dioxide supply device comprises carbon dioxide storage equipment (3) and a first pressure reducing valve (5) which are sequentially connected through a carbon dioxide pipeline, and the nitrogen supply device comprises nitrogen storage equipment (4) and a second pressure reducing valve (6) which are sequentially connected through a nitrogen pipeline; and the tail ends of the carbon dioxide pipeline and the nitrogen pipeline are converged into a gas supply pipeline and then are connected to a second inlet of the two-inlet one-outlet three-way valve (7) for supplying gas into the calibrator (2).
2. The simple calibrating device for the seawater carbon dioxide sensor is characterized in that a gas pipe passing through the gas inlet (8) extends into the bottom of the inner cavity of the calibrator (2), and a gas pipe inlet passing through the gas outlet (9) is positioned at the top of the inner cavity of the calibrator (2).
3. The simple calibrating device for the seawater carbon dioxide sensor as claimed in claim 1, wherein the calibrator (2) is a cylindrical housing sealed at the rest positions except the gas inlet (8) and the gas outlet (9).
4. The simple calibrating device for the seawater carbon dioxide sensor is characterized in that the calibrator (2) is made of organic glass.
5. The simple calibration device for seawater carbon dioxide sensor according to claim 1, wherein the carbon dioxide storage device (3) is a carbon dioxide cylinder.
6. The simple calibration device for the seawater carbon dioxide sensor according to claim 1, wherein the nitrogen storage device (4) is a nitrogen cylinder.
7. The simple calibration device for seawater carbon dioxide sensor as claimed in claim 1, wherein the gas inlet (8) and the gas outlet (9) are sealed with the connected gas pipe.
8. The simple calibration device for the seawater carbon dioxide sensor as claimed in claim 1, wherein the first pressure reducing valve (5) and the second pressure reducing valve (6) are both pressure reducing valves with adjustable opening degrees.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922368433.3U CN211348202U (en) | 2019-12-24 | 2019-12-24 | Simple and easy calibrating device of sea water carbon dioxide sensor |
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| CN201922368433.3U CN211348202U (en) | 2019-12-24 | 2019-12-24 | Simple and easy calibrating device of sea water carbon dioxide sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903618A (en) * | 2021-03-05 | 2021-06-04 | 中国计量科学研究院 | Calibration system of miniaturized carbon dioxide detector |
| CN113777262A (en) * | 2021-09-24 | 2021-12-10 | 同济大学 | Seawater methane sensor calibration device and method based on constant temperature control |
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2019
- 2019-12-24 CN CN201922368433.3U patent/CN211348202U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903618A (en) * | 2021-03-05 | 2021-06-04 | 中国计量科学研究院 | Calibration system of miniaturized carbon dioxide detector |
| CN113777262A (en) * | 2021-09-24 | 2021-12-10 | 同济大学 | Seawater methane sensor calibration device and method based on constant temperature control |
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