CN210834877U - Calibration control device for seawater dissolved oxygen sensor - Google Patents
Calibration control device for seawater dissolved oxygen sensor Download PDFInfo
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- CN210834877U CN210834877U CN201921558487.XU CN201921558487U CN210834877U CN 210834877 U CN210834877 U CN 210834877U CN 201921558487 U CN201921558487 U CN 201921558487U CN 210834877 U CN210834877 U CN 210834877U
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Abstract
The utility model discloses a seawater dissolved oxygen sensor calibration control device, which comprises an oxygen supply device, a nitrogen supply device, a water bath and a calibrator; the calibrator is arranged in the water bath, and the oxygen supply device and the nitrogen supply device supply gas into the calibrator through pipelines; the inside of the calibrator is provided with a stirrer, a dissolved oxygen sensor to be calibrated and a reference dissolved oxygen sensor, and the top of the calibrator is provided with a gas inlet and a gas outlet; the oxygen supply device is sequentially connected with an oxygen storage device, a first pressure reducing valve and an oxygen mass flow controller through an oxygen pipeline, the nitrogen supply device is sequentially connected with a nitrogen storage device, a second pressure reducing valve and a nitrogen mass flow controller through a nitrogen pipeline, and the air supply pipeline is communicated with the calibrator through an air inlet; the water bath is internally provided with a temperature control device. In the calibration process of the device, the calibration process can be realized by controlling and recording the temperature, the dissolved oxygen concentration and the calibration data of the dissolved oxygen sensor in the calibrator.
Description
Technical Field
The utility model belongs to the technical field of dissolved oxygen sensor is markd, concretely relates to sea water dissolved oxygen sensor marks controlling means.
Background
At present, most of dissolved oxygen sensors are calibrated by adopting a two-point method. A simple device is constructed by Raney Fuchang and the like for determining fluorescence quenching kinetic parameters of a fluorescence oxygen sensor under different dissolved oxygen concentrations and different temperatures, and a reliable two-point online calibration method is provided[1](ii) a The Panzhongquan and the like design the principle based on Faraday electrolytic reaction[2]And based on the principle of desorption[3]The trace dissolved oxygen instrument calibration device determines the trace dissolved concentration in water by theoretical calculation, but the system is complex and the measurement precision is low. The method has the defects of few calibration data points, low calibration temperature precision, low reference value accuracy and the like. Zheng 26107hui, etc. proposes a method and a device for calibrating a seawater dissolved oxygen sensor with multiple temperature points and large dissolved oxygen concentration range[4-6]And the calibration precision of the dissolved oxygen sensor is greatly improved. However, the calibration test process of the method is manually controlled, the automation degree of the calibration control device is low, and a large amount of time and labor are consumed.
Therefore, on the basis of the research of the previous method, a control device capable of accurately calibrating the seawater dissolved oxygen sensor is established, the calibration process of the seawater dissolved oxygen sensor is completed, and the popularization and the use of the seawater dissolved oxygen sensor are further promoted.
Reference to the literature
[1] Runfichang, Van Juan, Mo Zilu, et al, two-point calibration method for fluorescent oxygen sensors [ J ] Proc. university of chemical engineering, 1998, (4):392 Zi 396.
[2] Panzhongquan, Quichun, Liangxiu, etc. development of calibration device for electrolytic micro dissolved oxygen analyzer [ J ] chemometric analysis, 2005, 14 (3): 47-49 Lvcong wings, research on influence factors of chlorophyll in water by fluorescence method [ D ]. Hibei science and technology university, 2014.
[3] Panzhongquan, Liangxie, Shiliei, etc. Desorption method demarcates trace dissolved oxygen instrument [ J ] chemometric, 2007, 16 (3): 62-63.
[4] Zheng26107Zangming, Panjiaming, Yanjunyi, Xishang micro, research on laboratory calibration method of dissolved oxygen sensor by fluorescence quenching method [ J ]. report on oceanographic technology, 2016, 35 (1): 62-67.
[5] Zheng26107zuki, Panjiaming, Yanjunyi and optical dissolved oxygen sensor high-precision calibration method and device, China, invention patent No.: ZL201410803006.2
[6] Zheng 26107, brightness, Panjiaming, Yanjunyi, a device for high-precision calibration of optical dissolved oxygen sensors, China, Utility model patent No: ZL201420818735.0
Disclosure of Invention
The utility model aims at overcoming the problem that exists among the prior art, provide a sea water dissolved oxygen sensor and mark controlling means.
The utility model discloses the concrete technical scheme who adopts as follows:
a seawater dissolved oxygen sensor calibration control device comprises an oxygen supply device, a nitrogen supply device, a water bath and a calibrator; the oxygen supply device and the nitrogen supply device supply gas to the calibrator through pipelines; the calibrator is a sealed container and is arranged in a water bath, a stirrer, a dissolved oxygen sensor to be calibrated and a reference dissolved oxygen sensor are arranged in the calibrator, the stirring end of the stirrer extends into the lower part of the liquid level in the calibrator, and the dissolved oxygen sensor to be calibrated and the reference dissolved oxygen sensor are suspended and erected in the inner cavity of the calibrator through a fixing frame; the top of the calibrator is provided with a gas inlet and a gas outlet; the oxygen supply device comprises oxygen storage equipment, a first pressure reducing valve and an oxygen mass flow controller which are sequentially connected through an oxygen pipeline, and the nitrogen supply device comprises nitrogen storage equipment, a second pressure reducing valve and a nitrogen mass flow controller which are sequentially connected through a nitrogen pipeline; the tail ends of the oxygen pipeline and the nitrogen pipeline are converged into an air supply pipeline, and then the air supply pipeline passes through the air inlet and extends into the bottom of the inner cavity of the calibrator; and a temperature control device is arranged in the water bath kettle.
Preferably, the fixing frame inside the calibrator is provided with at least two sensor mounting positions which are arranged side by side, and the dissolved oxygen sensor to be calibrated and the reference dissolved oxygen sensor are respectively mounted on one sensor mounting position of the fixing frame.
Preferably, the fixing frame is provided with a plurality of sensor mounting positions for simultaneously mounting a reference dissolved oxygen sensor and a plurality of dissolved oxygen sensors to be calibrated.
Preferably, an air blowing sand nozzle is arranged at an air outlet of the air supply pipeline.
Preferably, the gas outlet is provided with a one-way valve for controlling gas to flow out and not flow in.
Preferably, the calibrator is filled with water.
Preferably, the oxygen storage device is an oxygen cylinder.
Preferably, the nitrogen storage device is a nitrogen gas cylinder.
Preferably, the gas supply line has a seal across the gas inlet.
Preferably, the dissolved oxygen sensor to be calibrated, the reference dissolved oxygen sensor, the oxygen mass flow controller, the nitrogen mass flow controller and the temperature control device are all connected to an automatic control device.
Preferably, the stirrer is a paddle stirrer, and the tail end of the paddle stirrer is driven to rotate by a motor.
Compared with the prior art, the utility model, following beneficial effect has:
the utility model relates to a seawater dissolved oxygen sensor calibration control device, which uses a reference dissolved oxygen sensor as the real-time monitoring basis for calibrating the temperature and the dissolved oxygen concentration in the test process and simultaneously as the data source of the calibration reference value; controlling the oxygen output of the oxygen cylinder by using an oxygen quality controller, and controlling the nitrogen output of the nitrogen cylinder by using a nitrogen quality controller; the water temperature is controlled by using a water bath kettle with a water temperature control device. During the calibration process, the device can control and record the temperature, the dissolved oxygen concentration and the calibration data of the dissolved oxygen sensor in the calibrator, thereby realizing the calibration process.
Drawings
Fig. 1 is a schematic view of the present invention;
FIG. 2 is an enlarged view of a portion of the marker of FIG. 1;
fig. 3 is a schematic diagram of an automated implementation of the present invention (the dashed lines connecting the autonomous devices in the figure represent control lines).
In the figure: the device comprises a dissolved oxygen sensor 1 to be calibrated, a reference dissolved oxygen sensor 2, an oxygen storage device 3, a nitrogen storage device 4, an oxygen mass flow controller 5, a nitrogen mass flow controller 6, a water bath 7, a calibrator 8, an automatic control device 9, a stirrer 10, an air blowing sand nozzle 11, a temperature control device 12, a gas inlet 13, a gas outlet 14, a one-way valve 15, a fixing frame 16, a first reducing valve 17 and a second reducing valve 18.
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, in order to provide a calibration control device for a seawater dissolved oxygen sensor in an embodiment of the present invention, its main components include an oxygen supply device, a nitrogen supply device, a water bath 7 and a calibrator 8. The calibrator 8 is a main body for calibration, and the oxygen supply device and the nitrogen supply device are used for supplying gas into the calibrator 8 through pipelines. The specific structure of the calibrator 8 is shown in fig. 2, and it is a sealed container, and is installed in the water bath 7, and the inside of the calibrator 8 is equipped with the stirrer 10, the dissolved oxygen sensor 1 to be calibrated, and the reference dissolved oxygen sensor 2. The interior of the calibrator 8 is filled with water in the using process, and the stirrer 10 is used for fully stirring the water in the calibrator to ensure that the water is uniformly mixed and the unicity of dissolved oxygen is kept. The stirring end of stirrer 10 should extend below the liquid level in calibrator 8. The stirrer 10 may be a paddle stirrer, and the tip is rotated by a motor provided outside the entire apparatus housing. The dissolved oxygen sensor 1 to be calibrated and the reference dissolved oxygen sensor 2 are suspended and erected in the inner cavity of the calibrator 8 through a fixing frame 16. The fixing frame 16 in the calibrator 8 is provided with at least two parallel sensor mounting positions, and the dissolved oxygen sensor 1 to be calibrated and the reference dissolved oxygen sensor 2 are respectively mounted on one sensor mounting position of the fixing frame 16. Preferably, the fixing frame 16 may be provided with a plurality of sensor mounting positions for simultaneously mounting one reference dissolved oxygen sensor 2 and a plurality of dissolved oxygen sensors 1 to be calibrated, so as to meet the requirement of simultaneously calibrating a plurality of sensors. The top of the calibrator 8 is provided with a gas inlet 13 and a gas outlet 14. The oxygen supply device comprises an oxygen storage device 3, a first pressure reducing valve 17 and an oxygen mass flow controller 5 which are sequentially connected through an oxygen pipeline, and the nitrogen supply device comprises a nitrogen storage device 4, a second pressure reducing valve 18 and a nitrogen mass flow controller 6 which are sequentially connected through a nitrogen pipeline. The tail ends of the oxygen pipeline and the nitrogen pipeline are converged into an air supply pipeline, and then the air supply pipeline passes through the air inlet 13 and extends into the bottom of the inner cavity of the calibrator 8. An air blowing sand nozzle 11 can be installed at the air outlet of the air supply pipeline, so that air can be controlled to enter the calibrator 8 in a dispersed bubble mode, and the mass transfer efficiency is improved. In this embodiment, the oxygen storage device 3 is an oxygen cylinder, the nitrogen storage device 4 is a nitrogen cylinder, and other high-pressure gas storage devices may be adopted. In addition, because the water bath temperature needs to be adjusted during the use process, the temperature control device 12 is installed in the water bath 7, and the embodiment can be realized by adopting a heating rod.
In addition, the gas supply line should be provided with a seal, such as a rubber ring, at the location where it passes through the gas inlet 13. Meanwhile, the gas outlet 14 is provided with a check valve 15 for controlling the gas to only flow out and not flow in, and when oxygen or nitrogen is introduced into the calibrator 8, redundant gas can be discharged, so that the pressure in the calibrator 8 is kept unchanged.
When in use, the calibrator 8 is filled with water and is integrally placed in the water bath 7,
the temperature control device 12 to be calibrated for the dissolved oxygen sensor 1, the reference dissolved oxygen sensor 2, the oxygen mass flow controller 5, the nitrogen mass flow controller 6, and the water bath can be set as required, and the specific calibration process can be described in the utility model patent No. ZL 201420818735.0. The dissolved oxygen sensor 1 to be calibrated, the reference dissolved oxygen sensor 2, the oxygen mass flow controller 5, the nitrogen mass flow controller 6 and the temperature control device 12 can be manually controlled as required, and can also be connected to the automatic control device 9 through a line to be controlled by the automatic control device, and the automatic control device 9 can be externally connected with a display for conveniently detecting the data operation condition, as shown in fig. 3. Because the whole calibration process has more control steps, the automatic control device 9 is preferably adopted to realize the automatic treatment of the process.
The following uses an AADI3835 dissolved oxygen sensor (reference dissolved oxygen sensor) and an AADI 4330 dissolved oxygen sensor (to-be-calibrated dissolved oxygen sensor) as an example to further explain the operation method of the device of the present invention when being used for calibrating the seawater dissolved oxygen sensor, and specifically includes the following steps:
(1) completing the connection of all parts of the device;
(2) in the automatic control equipment 9, the values of temperature control points T1, T2, T3, T4 and T5 are set to 45, 35, 25, 15 and 5 respectively, the values of dissolved oxygen concentration control points C1, C2, C3, C4, C5, C6, C7, C8, C9 and C10 are set to 300, 270, 240, 210, 180, 150, 120, 90, 60 and 30 respectively, the maximum allowable deviation value X between the measured value of the temperature and the program preset value in the calibrator 8 and the maximum allowable deviation value Y between the measured value of the dissolved oxygen concentration and the program preset value are set to 0.1, and the maximum allowable relative standard deviation value Z between the continuous five groups of measured values of the dissolved oxygen sensor AADI3835 is set to 1%;
(3) the full-automatic calibration test of the seawater dissolved oxygen sensor is started according to a preset program, and the specific process comprises the following steps:
1) the program temperature initial control target is 45 ℃, the relation between the current temperature in the calibrator and the program temperature is judged according to the temperature value of the AADI3835 dissolved oxygen sensor, if the temperature in the calibrator is higher than 45 ℃, the refrigerator is started, otherwise, the heating rod is started, and then the temperature value in the calibrator is maintained at 45 +/-0.1 ℃;
2) the initial control target of the programmed dissolved oxygen concentration is 300 mu mol/L, the relation between the current dissolved oxygen concentration in the calibrator and the current dissolved oxygen concentration is judged according to the dissolved oxygen concentration value of the AADI3835 dissolved oxygen sensor, if the dissolved oxygen concentration value in the calibrator is higher than 300 mu mol/L, the nitrogen mass flow controller is started to feed nitrogen, otherwise, the oxygen mass flow controller feeds oxygen, when the dissolved oxygen concentration in the calibrator is consistent with 300 mu mol/L, the mass flow controller is closed, and the dissolved oxygen concentration value in the calibrator is maintained at 300 +/-1 mu mol/L;
3) maintaining the temperature in the calibrator to be 45 +/-0.1 ℃ and the dissolved oxygen concentration to be 300 +/-1 mu mol/L, continuously monitoring the actual measurement data of the AADI3835 dissolved oxygen sensor and the AADI 4330 dissolved oxygen sensor, and respectively recording the signal value of the AADI 4330 dissolved oxygen sensor and the dissolved oxygen concentration value and the temperature value of the AADI3835 dissolved oxygen sensor when the relative standard deviation value of the continuous five groups of actual measurement values of the AADI3835 dissolved oxygen sensor is less than or equal to 1%;
4) changing the program dissolved oxygen concentration control target from 300 mu mol/L to 270, 240, 210, 180, 150, 120, 90, 60 and 30 mu mol/L in sequence, maintaining the program temperature control target at 45 ℃ and repeating the steps 2) and 3);
5) changing the program temperature control target from 45 ℃ to 35, 25, 15 and 5 ℃ in sequence, and repeating the steps 1) to 4);
6) according to the signal value of the AADI 4330 dissolved oxygen sensor, the temperature value and the dissolved oxygen value of the AADI3835 dissolved oxygen sensor recorded in the calibration test process, the calibration coefficient of the AADI 4330 dissolved oxygen sensor is calculated, and the specific calculation method is consistent with the record of the utility model ZL 201420818735.0.
The automatic control equipment 9 in the process can realize full-automatic control of the calibration process, and compared with the existing method, the automatic control equipment can greatly reduce the labor input and realize unattended operation of the calibration test process. It is of course noted that the process of disengaging the autonomous device 9 can also be carried out manually.
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 (10)
1. A calibration control device of a seawater dissolved oxygen sensor is characterized by comprising an oxygen supply device, a nitrogen supply device, a water bath (7) and a calibrator (8); the oxygen supply device and the nitrogen supply device supply gas to the calibrator (8) through pipelines; the calibrator (8) is a sealed container and is arranged in the water bath (7), a stirrer (10), a dissolved oxygen sensor (1) to be calibrated and a reference dissolved oxygen sensor (2) are arranged in the calibrator (8), the stirring end of the stirrer (10) extends into the lower part of the liquid level in the calibrator (8), and the dissolved oxygen sensor (1) to be calibrated and the reference dissolved oxygen sensor (2) are suspended and erected in the inner cavity of the calibrator (8) through a fixing frame (16); the top of the calibrator (8) is provided with a gas inlet (13) and a gas outlet (14); the oxygen supply device comprises an oxygen storage device (3), a first pressure reducing valve (17) and an oxygen mass flow controller (5) which are sequentially connected through an oxygen pipeline, and the nitrogen supply device comprises a nitrogen storage device (4), a second pressure reducing valve (18) and a nitrogen mass flow controller (6) which are sequentially connected through a nitrogen pipeline; the tail ends of the oxygen pipeline and the nitrogen pipeline are converged into an air supply pipeline, and then the air supply pipeline passes through the air inlet (13) and extends into the bottom of the inner cavity of the calibrator (8); the water bath pot (7) is internally provided with a temperature control device (12).
2. The seawater dissolved oxygen sensor calibration control device according to claim 1, wherein the fixing frame (16) inside the calibrator (8) is provided with at least two side-by-side sensor mounting positions, and the dissolved oxygen sensor (1) to be calibrated and the reference dissolved oxygen sensor (2) are respectively mounted on one sensor mounting position of the fixing frame (16).
3. The calibration control device of the seawater dissolved oxygen sensor as claimed in claim 2, wherein the fixing frame (16) has a plurality of sensor mounting positions for simultaneously mounting one reference dissolved oxygen sensor (2) and a plurality of dissolved oxygen sensors (1) to be calibrated.
4. The calibration control device of the seawater dissolved oxygen sensor as claimed in claim 1, wherein an air blowing sand nozzle (11) is installed at the air outlet of the air supply pipeline.
5. The calibration control device of the seawater dissolved oxygen sensor as claimed in claim 1, wherein the gas outlet (14) is provided with a one-way valve (15) for controlling gas to flow out and not flow in.
6. The seawater dissolved oxygen sensor calibration control device according to claim 1, wherein the calibrator (8) is filled with water.
7. The calibration control device of the seawater dissolved oxygen sensor according to claim 1, wherein the oxygen storage device (3) is an oxygen cylinder.
8. The seawater dissolved oxygen sensor calibration control device according to claim 1, wherein the nitrogen storage equipment (4) is a nitrogen gas cylinder.
9. The calibration control device of the seawater dissolved oxygen sensor as claimed in claim 1, wherein the dissolved oxygen sensor (1) to be calibrated, the reference dissolved oxygen sensor (2), the oxygen mass flow controller (5), the nitrogen mass flow controller (6) and the temperature control device (12) are all connected to a self-control device.
10. The calibration control device of the seawater dissolved oxygen sensor as claimed in claim 1, wherein the stirrer (10) is a paddle stirrer, and the tip of the paddle stirrer is driven by a motor to rotate.
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| CN113916849A (en) * | 2021-09-10 | 2022-01-11 | 山东省科学院海洋仪器仪表研究所 | Calibration method and calibration device for optical dissolved oxygen sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113916849A (en) * | 2021-09-10 | 2022-01-11 | 山东省科学院海洋仪器仪表研究所 | Calibration method and calibration device for optical dissolved oxygen sensor |
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