CN212111238U - Self-calibration device of seawater conductivity sensor - Google Patents
Self-calibration device of seawater conductivity sensor Download PDFInfo
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- CN212111238U CN212111238U CN202020785071.8U CN202020785071U CN212111238U CN 212111238 U CN212111238 U CN 212111238U CN 202020785071 U CN202020785071 U CN 202020785071U CN 212111238 U CN212111238 U CN 212111238U
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Abstract
The utility model provides a sea water conductivity sensor self calibration device, it includes: the thermostatic bath is internally provided with thermostatic liquid; the seawater conductivity sensor is positioned in a conductivity cell in the thermostatic bath; the standard medium container is positioned on the outer side of the constant temperature tank, and at least one bottle of standard seawater is arranged in the standard medium container; a temperature sensing coil is arranged between the standard medium container and the seawater conductivity sensor. The utility model has the advantages of easy operation, low cost, and accurate and convenient measurement.
Description
Technical Field
The utility model belongs to sensor calibration field especially relates to a sea water conductivity sensor self calibration device.
Background
The sea water conductivity sensor is generally used for measuring sea conductivity (salinity), a measuring electrode of the conductivity sensor generally consists of an exciting electrode and a receiving electrode, the exciting electrode generates exciting information and generates an electric field in a measured solution, the receiving electrode receives and transmits an electric signal in the electric field to an amplifying circuit, finally the electric signal is converted into a signal output which can be identified by an acquisition system, and the signal output can be converted by a numerical equation to obtain a conductivity value of the measured solution.
The measurement accuracy of the seawater conductivity sensor in two inspection periods can drift along with the time, which is determined by the material, the packaging method and the measurement principle of the sensor, and a using unit is lack of a detection device and a detection means, so that a plurality of conductivity sensors can only be utilized to perform a comparison experiment in a seawater constant temperature bath, and the measurement accuracy of the sensor is evaluated according to the experiment result. Because no national authorized standard substance or standard device is used in the experimental process, even if the measurement results of a plurality of sensors are close to or the same, the measurement accuracy of the sensors cannot be proved to meet the requirement; if the measurement difference of several sensors is large, the conclusion about whether the conductivity measurement result is accurate or not can not be obtained. In addition, because the seawater thermostatic bath is used for simulating the marine hydrological environment, the uniformity and the volatility index of a temperature field in the bath body need to be ensured, the volume is generally more than 400L, and if a standard substance is used as a thermostatic bath medium, the cost is too high; even if standard seawater is used as a thermostatic bath medium, a calibration experiment is carried out for the conductivity sensor, a tester needs to measure the conductivity at 5 temperature calibration points, and the experimental process needs more than 6 hours. In the whole experiment period, the salinity value is changed due to the evaporation of the medium moisture, and the measurement accuracy cannot be measured. In addition, because the cost of parts such as a titanium alloy tank body, a titanium alloy cooling coil and a titanium alloy heater for manufacturing the seawater thermostatic tank is high, the seawater conductivity sensor uses a method of a unit reference professional metering mechanism to carry out a measurement accuracy test of the seawater conductivity sensor, and the economic burden and the personnel burden are heavy.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a sea water conductivity sensor calibrating device adopts the constant temperature tank (volume, cost are far less than the sea water constant temperature tank) of water or oily medium in the device, uses the china series standard sea water of 5 different salinity values to carry out the measurement accuracy detection of sea water conductivity sensor.
The utility model provides a sea water conductivity sensor self calibration device, it includes: the thermostatic bath is internally provided with thermostatic liquid; a seawater conductivity sensor located within a conductivity cell in the thermostatic bath; the standard medium container is positioned on the outer side of the constant temperature tank, and at least one bottle of standard seawater is arranged in the standard medium container; a temperature sensing coil is arranged between the standard medium container and the seawater conductivity sensor.
Wherein the constant-temperature liquid is water or oil.
Wherein, an electromagnetic valve is arranged between the standard medium container and the temperature sensing coil.
Wherein the conductivity cell is connected to a diaphragm pump.
Wherein, the temperature sensing coil pipe is made of titanium alloy.
The utility model discloses need not purchase resistant seawater corrosion's sea water thermostatic bath and high accuracy salinity meter and just can accomplish the measurement accuracy test, ensure the accuracy and the reliability of sea water conductivity sensor measuring result.
Drawings
Fig. 1 the utility model discloses a seawater conductivity sensor calibrating device schematic structure.
Detailed Description
To facilitate understanding of the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings, and it should be understood by those skilled in the art that the following description is only for convenience of explanation of the present invention and is not intended to specifically limit the scope thereof.
Fig. 1 shows the calibration device for seawater conductivity sensor of the present invention. The calibration device for the seawater conductivity sensor comprises a thermostatic bath 1, thermostatic liquid 2, a circulating connecting pipeline 3, a seawater conductivity sensor 4, a temperature sensing coil pipe 5, an electromagnetic valve 6, a diaphragm pump 7, a standard medium container 8 and the like, wherein a plurality of standard seawater bottles, preferably a plurality of standard seawater bottles, can be arranged in the standard medium container at the same time, and one (or one) standard seawater bottle can be manually or automatically selected to enter the calibration device.
The seawater conductivity sensor 4 is connected to the temperature sensing coil 5, the electromagnetic valve 6 and the diaphragm pump 7 are disposed outside the thermostatic bath 1 or on the sidewall of the thermostatic bath 1 or on the top of the thermostatic bath 1, the standard medium 8 is connected to the seawater conductivity sensor 4, and the thermostatic bath 1, the seawater conductivity sensor 4, the temperature sensing coil 5, the electromagnetic valve 6, the diaphragm pump 7 and the standard medium container 8 are connected by the circulation connecting pipeline 3, and it can be understood by those skilled in the art that, in the connection of the above components, the circulation connecting pipeline 3 is not limited to be used, and other suitable connecting components can be selected according to the need, and the circulation connecting pipeline 3 and the above components are not directly contacted with each other, and can also be connected by other intermediate components.
As a further preferred embodiment, a constant temperature liquid 2 is contained in a constant temperature bath 1 of the calibration apparatus for seawater conductivity sensor, the constant temperature bath 1 comprises a temperature control component for heating the constant temperature liquid 2 to keep a constant temperature, and the constant temperature liquid 2 is preferably a liquid medium such as water or oil; the seawater conductivity sensor 4 is arranged in a conductivity cell, the conductivity cell is arranged in the thermostatic bath 1, a first connecting pipeline is arranged between the conductivity cell and the temperature sensing coil 5, and preferably, the first end of the conductivity cell is connected with the first end of the temperature sensing coil 5 through the first connecting pipeline; a second connecting pipeline is arranged between the conductance cell and the diaphragm pump 7, preferably, the second end of the conductance cell is connected to the diaphragm pump 7 through the second connecting pipeline, and the diaphragm pump 7 is connected to the thermostatic bath 1 through a third connecting pipeline. A fourth connecting pipeline is arranged between the temperature sensing coil 5 and the electromagnetic valve 6, and preferably, the second end of the temperature sensing coil 5 is connected to the electromagnetic valve 6 through the fourth connecting pipeline; a fifth connecting line is provided between the solenoid valve 6 and the standard medium container 8, preferably the solenoid valve 6 is connected to the standard medium container 8 via a fifth connecting line 9.
The first to fifth connecting lines form a part of the circulating connecting line 3, the temperature sensing coil 5 is preferably made of titanium alloy, and the first to fifth connecting lines are preferably corrosion-resistant hoses.
Adopt the utility model discloses a when sea water conductivity sensor calibrating device carried out the calibration, the following step of adoption was gone on:
firstly, the temperature of the thermostatic bath 1 is adjusted through the temperature control assembly, so that the thermostatic liquid in the thermostatic bath 1 has a set temperature; then, the temperature sensing coil 5 and the seawater conductivity sensor 4 are immersed in the thermostat 1 with well-controlled temperature.
During calibration, the electromagnetic valve 6 and the diaphragm pump 7 are opened, so that the standard seawater in the standard medium container 8 flows through the temperature sensing coil 5 at a proper flow rate, the temperature sensing coil 5 is fully contacted with the constant temperature liquid 2, and rapid thermal balance is realized, so that the temperature of the standard seawater is basically the same as that of the constant temperature liquid 2 in the constant temperature bath 1; specifically, the standard seawater in the standard medium container 8 enters the electromagnetic valve 6 through the fifth connecting pipeline, and the standard seawater flows into the fourth connecting pipeline through the opening of the electromagnetic valve 6; the standard seawater enters the temperature sensing coil 5 from the fourth connecting pipeline, and the temperature sensing coil 5 is fully contacted with the constant temperature liquid 2, so that the temperature of the standard seawater is basically the same as that of the constant temperature liquid 2 in the constant temperature bath 1; preferably, as a further alternative embodiment, an optical detection device may be provided to detect the flowing position of the standard seawater in the temperature sensing coil 5, so as to control the switch of the electromagnetic valve 6 or the diaphragm pump 7, so that the standard seawater stays in the temperature sensing coil 5 for a predetermined time to obtain a more accurate temperature, and when the standard seawater in the temperature sensing coil 5 has a predetermined temperature, the standard seawater may be controlled to continue flowing.
Then, standard seawater enters the conductivity cell, the conductivity value of the seawater conductivity sensor 4 starts to be read at the same time, the measured salinity value is obtained through calculation, and the first group of calibration experiments are completed; specifically, the standard seawater flows out of the temperature sensing coil 5 and then enters the conductivity cell through the first connecting pipeline, and the standard seawater flowing out of the conductivity cell sequentially passes through the second connecting pipeline, the diaphragm pump 7 and the third connecting pipeline.
Further, replacing the Chinese series standard seawater with other salinity values, continuing to measure according to the process until 5 groups of Chinese series standard seawater with different salinity values are measured, comparing the measurement result of the conductivity sensor with the salinity values of the 5 groups of standard seawater to obtain an accuracy test result, and performing data fitting calculation through a calculation model of the sensor to correct the measurement error and linear drift.
The utility model discloses a sea water conductivity sensor calibration pipeline can use 5 bottles (220 mL/bottle) standard sea water to carry out the measurement accuracy test of sensor. The thermostatic bath only needs to provide an accurate temperature environment, can adopt any medium, has low test cost, does not depend on other expensive equipment such as a high-precision salinity meter, has low test cost, and does not need professional metering technicians. The traditional comparison method needs to use 400L of standard seawater or purchase professional equipment such as a seawater constant temperature tank, a high-precision salinity meter and the like according to a professional metering mechanism to carry out measurement accuracy test. The utility model discloses a standard sea water does not have pollution and evaporation problem at the enclosure space flow, measures the accuracy height, weak point consuming time.
It is to be understood that while the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention to the disclosed embodiment. To anyone skilled in the art, without departing from the scope of the present invention, the technical solution disclosed above can be used to make many possible variations and modifications to the technical solution of the present invention, or to modify equivalent embodiments with equivalent variations. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still fall within the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.
Claims (5)
1. A seawater conductivity sensor self-calibration apparatus, comprising: the thermostatic bath is internally provided with thermostatic liquid; a seawater conductivity sensor located within a conductivity cell in the thermostatic bath; the standard medium container is positioned on the outer side of the constant temperature tank, and at least one bottle of standard seawater is arranged in the standard medium container; the method is characterized in that: a temperature sensing coil is arranged between the standard medium container and the seawater conductivity sensor.
2. The seawater conductivity sensor self-calibration apparatus of claim 1, wherein: the constant-temperature liquid is water or oil.
3. The seawater conductivity sensor self-calibration apparatus of claim 1, wherein: an electromagnetic valve is arranged between the standard medium container and the temperature sensing coil pipe.
4. The seawater conductivity sensor self-calibration apparatus of claim 1, wherein: the conductivity cell is connected to a diaphragm pump.
5. The seawater conductivity sensor self-calibration apparatus of claim 1, wherein: the temperature sensing coil pipe is made of titanium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020785071.8U CN212111238U (en) | 2020-05-13 | 2020-05-13 | Self-calibration device of seawater conductivity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020785071.8U CN212111238U (en) | 2020-05-13 | 2020-05-13 | Self-calibration device of seawater conductivity sensor |
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| Publication Number | Publication Date |
|---|---|
| CN212111238U true CN212111238U (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020785071.8U Expired - Fee Related CN212111238U (en) | 2020-05-13 | 2020-05-13 | Self-calibration device of seawater conductivity sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924494A (en) * | 2021-01-20 | 2021-06-08 | 德州尧鼎光电科技有限公司 | Conductivity sensor with in-situ self-calibration function |
-
2020
- 2020-05-13 CN CN202020785071.8U patent/CN212111238U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924494A (en) * | 2021-01-20 | 2021-06-08 | 德州尧鼎光电科技有限公司 | Conductivity sensor with in-situ self-calibration function |
| CN112924494B (en) * | 2021-01-20 | 2022-07-29 | 德州尧鼎光电科技有限公司 | Conductivity sensor with in-situ self-calibration function |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201208 Termination date: 20210513 |