CN220271221U - Device for measuring concentration of solution - Google Patents
Device for measuring concentration of solution Download PDFInfo
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- CN220271221U CN220271221U CN202322247725.8U CN202322247725U CN220271221U CN 220271221 U CN220271221 U CN 220271221U CN 202322247725 U CN202322247725 U CN 202322247725U CN 220271221 U CN220271221 U CN 220271221U
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- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 14
- 238000002474 experimental method Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 239000000758 substrate Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model relates to the technical field of physical experiment teaching, in particular to a device for measuring solution concentration, which comprises a measuring device and a measuring circuit, wherein the measuring device comprises a measuring container, electrodes are respectively arranged at two ends of the inner side of the measuring container, the electrodes are connected with a detecting circuit through wires, an insulating layer is arranged outside the measuring container, a heating module is arranged at the lower part of the measuring container, and a measured solution is arranged in the measuring container. The utility model converts the measurement of the solution concentration into the measurement of the solution resistance by utilizing the property that the solution with different concentrations has different conductivity, and the utility model has the advantages of simple structure, easy operation, low cost, high measurement precision and high speed, and effectively solves the technical problems of large volume and complex structure of the traditional solution concentration measuring device.
Description
Technical Field
The utility model relates to the technical field of physical experiment teaching, in particular to a device for measuring solution concentration.
Background
In the fields of pharmaceutical, chemical, food and semiconductor manufacturing, etc., rapid and accurate measurement of solution concentration is required. Currently, the main methods for measuring the concentration of a solution are an optical method, an ultrasonic method and a chemical method. Although the optical method has high measurement accuracy, the required equipment has higher price, the structure is complex, and the measurement result is greatly influenced by temperature; although the ultrasonic method has simple structure, the accuracy is low, and the ultrasonic method is greatly influenced by environmental factors such as mechanical vibration, air disturbance and the like; the chemical method has complex detection process, causes environmental pollution and can not detect in real time. Therefore, it is urgent to find a most feasible solution concentration measurement method to make a more accurate solution concentration measurement method.
For example, the utility model patent publication No. CN105445311B discloses a liquid concentration detecting device comprising a first substrate, a first temperature sensing element and a concentration sensor. The first substrate has opposite first and second surfaces. The first temperature sensing element is arranged on the first surface to sense the temperature of the liquid outside the liquid concentration detection device. The concentration sensor is arranged on the second surface and comprises a second substrate, a hole element, a heating element and a second temperature sensing element. The second substrate is arranged on the second surface, the hole element provides partial liquid to enter the concentration sensor, the heating element heats partial liquid entering the concentration sensor, and the second temperature sensing element senses the temperature variation of partial liquid entering the concentration sensor. And comparing the measured temperature with the temperature variation to obtain the concentration of the measured liquid. This patent is bulky and complex in structure, resulting in an expensive measuring device.
Disclosure of Invention
Aiming at the technical problems of large volume and complex structure of the existing solution concentration measuring device, the utility model provides a device for measuring the solution concentration, which solves the problems of high price, complex structure and lower precision of the measuring device.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows: the utility model provides a measure device of solution concentration, includes measuring device and measuring circuit, and measuring device is provided with the electrode including measuring container and temperature measuring device respectively at measuring container inboard both ends, and the electrode is connected with detecting circuit through the wire, and measuring container outside is provided with the heat preservation, and measuring container lower part is provided with heating module, is provided with the solution that is surveyed in the measuring container.
The rear side of the electrode is provided with a baffle, the electrode is arranged on two sides of the measuring container, the baffle is arranged between the electrode and the measuring container, and the electrode is fixedly connected with the baffle.
The measuring container is a container with an opening at the upper end, the electrodes are arranged at two ends of the inside of the container, and the heat insulation layer is arranged at the outer side of the container.
The electrode is a graphite electrode, and the separator is an insulating separator.
The detection circuit comprises a slide rheostat, a power supply, a switch, a voltmeter and a measuring instrument, wherein the power supply, the switch, the slide rheostat and the measured solution are connected in series through electrodes, the voltmeter is connected in parallel with the measured solution, and the slide rheostat is connected in parallel with the measuring instrument.
The measuring device also comprises a temperature measuring device.
The temperature measuring device is an infrared temperature measuring instrument which is arranged outside the measured solution.
The temperature measuring device is a thermocouple thermometer, and the thermocouple thermometer is arranged in the measured solution.
The power supply is an alternating current power supply, and the measuring instrument is an oscilloscope.
The heat preservation layer is a tinfoil paper layer.
The utility model provides a device for measuring solution concentration, which utilizes the property that the conductivity of solutions with different concentrations is different, calculates the conductivity by measuring the resistance value, establishes the relation between the solution conductivity and the concentration, only measures the resistance value when the concentration of the measured solution is measured, calculates the solution conductivity, and then uses the function relation conversion to obtain the solution concentration. The technical scheme of the utility model has the advantages of simple structure, easy operation, low cost, high measurement precision and high speed, and effectively solves the technical problems of large volume and complex structure of the existing solution concentration measuring device.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a schematic circuit diagram of the present utility model.
FIG. 3 is a graph showing the fitting result of measurement calibration experimental data according to the present utility model.
In the figure, 1 is a heat insulation layer, 2 is a partition board, 3 is an electrode, 4 is a measured solution, 5 is a lead, 6 is a detection circuit, 61 is a sliding rheostat, 62 is an alternating current power supply, 63 is a switch, 64 is a voltmeter, and 65 is an oscilloscope.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, a device for measuring solution concentration comprises a measuring device and a detection circuit 6, wherein the measuring device comprises a measuring container and a temperature measuring device, electrodes 3 are respectively arranged at two ends of the inner side of the measuring container, the electrodes 3 are connected with the detection circuit 6 through wires 5, an insulating layer 1 is arranged outside the measuring container, and a heating module is arranged at the lower part of the measuring container. The electrode 3 is mainly used for connecting the measured solution 4 to the detection circuit 6 for resistance measurement, and the detection circuit 6 is mainly used for electrifying the measured solution 4 for measuring the resistance value. The heat preservation layer 1 is a tin foil layer and is mainly used for preserving heat of the measured solution 4, so that the measured solution 4 is prevented from generating larger temperature change in the measuring process, and errors are avoided. The heating module can be a heating resistor, and is mainly used for heating the measured solution 4 to a fixed temperature, so that the accuracy of measurement is ensured. The temperature measuring device is mainly used for measuring the temperature of the measured solution 4, and can be arranged in the measuring container or outside the measuring container.
Specifically, the measuring container is an upper-end-opened container, the solution 4 to be measured is added into the insulating container through the upper-end opening, the electrodes 3 are arranged at two ends of the inner part of the upper-end-opened container, and the heat-insulating layer 1 is arranged at the outer side of the upper-end-opened container. A separator 2 is arranged between the electrode 3 and the measuring container, and the separator 2 is fixedly connected with the electrode 3. In order to ensure that the electrode 3 and the measured solution 4 do not react chemically, and avoid the change of the type of free mobile ions in the solution, the electrode 3 is a graphite electrode. Meanwhile, the graphite material has good processability, and the hardness is increased at high temperature, so that the discharge loss (the loss of graphite is 1/4 of that of copper) can be effectively reduced, and the measurement accuracy is improved. The separator 2 is an insulating separator. The cross-sectional area of the measured solution 4 in the container is determined to be S and the length is determined to be L according to the shape of the measuring container, and the magnitude of the resistance R of the solution is inversely related to the vertical cross-sectional area S of the electrode under the condition that the measuring environment is fixed according to ohm' S law. In the device, the liquid resistivity is inversely proportional to the distance between the graphite plates and is directly proportional to the vertical sectional area S of the measured liquid between the graphite plates, and the distance between the graphite plates (namely the length L of the measured solution 4) and the vertical sectional area S of the measured liquid (namely the vertical sectional area S of the measured solution 4) can be constant, so the ratio is called a plate constant C.
The detection circuit 6 includes a slide rheostat 61, a power supply 62, a switch 63, a voltmeter 64, and a measuring instrument 65, the power supply 62, the switch 63, and the slide rheostat 61 are connected in series with the measuring device through the electrode 3, the voltmeter 64 is connected in parallel with the measuring device, and the slide rheostat 61 is connected in parallel with the measuring instrument 65. Wherein, the measuring instrument 65 can be an oscilloscope. The voltmeter 64 is mainly used for measuring voltages at two ends of the measured solution 2, and because the direct current power supply can generate polarization charges inside the measured solution 2, the conductivity of the measured solution 2 is changed, and a large error is caused, so that the power supply 62 is an alternating current power supply, and unnecessary error is avoided.
The conductivity properties of solutions of different concentrations or of different species are generally not the same, i.e. they have different conductivities σ (reflected in resistances). Based on this property, the conductivity is further calculated by measuring the resistance of a certain solution of a series of known concentrations c, and finally the functional dependence between the conductivity sigma and the concentration c is given.
The specific steps for measuring the concentration of the liquid by using the device are as follows:
s1, assembling a testing device, connecting a device without the tested solution 4 with a slide rheostat 61, an alternating current power supply 62 and a switch 63 in series through a lead 5, connecting a voltmeter 64 with a liquid resistor 1 in parallel through a lead, and connecting an oscilloscope 65 with the slide rheostat 61 in parallel through a lead.
S2, adding the prepared NaCl solution with a certain concentration into the liquid resistor device, and presetting the sliding rheostat 61 to play a role in protecting a detection circuit;
s3, turning on a power switch 63, preheating for 10-15min by using a heating module, and monitoring the temperature of the measured solution 4 by using an infrared thermometer until the temperature reaches a preset temperature;
s4, according to the improved experience of a shunt resistance method, the display number 61 of the sliding rheostat is adjusted to be 0 omega and is recorded as R 0 . Opening the switch of the oscilloscope 65, adjusting the sensitivity knob to a proper gear, recording the indication of the voltage gear at the moment, and recording as U 0 ；
S5, adjusting the indication number of the slide rheostat 61 to be 1 omega, and recording as R 1 . Adjusting the sensitivity knob of the oscilloscope to a proper gear, recording the indication number of the voltage gear at the moment, and recording as U 1 And is measured by a voltmeter 64The voltage indication of the two ends of the liquid resistor to be measured is recorded as U (see table 1);
table 1 measurement data of liquid concentration and conductivity
S6, according to ohm's lawCalculating the current I of the detection circuit and then passing through ohm's law>The resistance R of the resistor to be measured can be obtained;
s7, calculating a formula through resistivityBrings the resistance R to be measured, the plate constant +.>Calculating to obtain resistivity ρ and conductivity +.>And is recorded in table 2. Wherein the cross section area S of the polar plate is 16cm 2 The length L of the polar plate is 5.4cm.
Table 2 measurement of conductivity prediction solution concentration
S8, preparing NaCl solutions with different concentrations, and repeating the experimental operation. Experimental data were input into python software to obtain a fitted function curve as shown in figure 3. Obtaining the function relation c= 3696.8291607 σ of the solution concentration and the conductivity according to the fitting curve 3 -857.51587539σ 2 +146.86219396σ-2.81398363。
S9, selecting NaCl solution with concentration of 8%,10% and 12%, pouring one solution into the device for testing each time, measuring the resistance value R according to the steps, further calculating the conductivity sigma, and finally predicting the concentration of the solution according to the functional relation between the concentration of the solution and the conductivity, wherein the prediction result is shown in table 2.
Example 2
The device for measuring the concentration of the solution can be an infrared thermometer, a temperature measuring end of the infrared thermometer is aligned with the measured solution 4 in the measuring container, and after the power supply 62 is closed, the temperature measuring device is started to monitor the temperature of the measured solution 4 in real time. When the temperature measuring device is used, an experimenter firstly heats the measured solution 4 by using the heating module, and monitors the measured solution 4 in real time by using the infrared thermometer, so that larger measuring errors caused by temperature are prevented. But the resistance of the measured solution 4 is measured again when the measured solution 4 reaches a suitable temperature.
Other structures and principles are the same as those of embodiment 1.
Example 3
The utility model provides a measure device of solution concentration, temperature measuring device selects thermocouple thermometer, and thermocouple thermometer sets up in measuring the container, gathers the temperature information of measured solution 4 in real time, carries out concentration measurement again after measured solution 4 is heated to the settlement temperature to ensure measuring accuracy.
Other structures and principles are the same as those of embodiment 2.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. The device for measuring the concentration of the solution is characterized by comprising a measuring device and a detection circuit (6), wherein the measuring device comprises a measuring container, electrodes (3) are respectively arranged at two ends of the inner side of the measuring container, the electrodes (3) are connected with the detection circuit (6) through wires (5), an insulating layer (1) is arranged outside the measuring container, a heating module is arranged at the lower part of the measuring container, and the measured solution (4) is arranged in the measuring container.
2. The device for measuring the concentration of the solution according to claim 1, wherein a partition board (2) is arranged at the rear side of the electrode (3), the electrode (3) is arranged at two sides of the measuring container, the partition board (2) is arranged between the electrode (3) and the measuring container, and the electrode (3) is fixedly connected with the partition board (2).
3. The device for measuring the concentration of a solution according to claim 2, wherein the measuring container is a container with an open upper end, electrodes (3) are provided at both ends inside the container, and a heat insulating layer (1) is provided outside the container.
4. A device for measuring the concentration of a solution according to claim 3, characterized in that the electrode (3) is a graphite electrode and the separator (2) is an insulating separator.
5. The device for measuring the concentration of a solution according to any one of claims 1 to 4, characterized in that the detection circuit (6) comprises a slide rheostat (61), a power supply (62), a switch (63), a voltmeter (64) and a measuring instrument (65), the power supply (62), the switch (63), the slide rheostat (61) and the solution to be measured (4) are connected in series through the electrode (3), the voltmeter (64) and the solution to be measured (4) are connected in parallel, and the slide rheostat (61) and the measuring instrument (65) are connected in parallel.
6. The device for measuring the concentration of a solution according to claim 5, wherein the measuring device further comprises a temperature measuring device, which is arranged outside or inside the solution (4) to be measured.
7. The device for measuring the concentration of a solution according to claim 6, wherein the temperature measuring device is an infrared thermometer, which is arranged outside the solution (4) to be measured.
8. The device for measuring the concentration of a solution according to claim 6, wherein the temperature measuring device is a thermocouple thermometer, which is arranged in the solution (4) to be measured.
9. The device for measuring the concentration of a solution according to claim 7 or 8, characterized in that the power source (62) is an alternating current power source and the measuring instrument (65) is an oscilloscope.
10. Device for measuring the concentration of a solution according to claim 9, characterized in that the insulating layer (1) is a layer of tin foil paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322247725.8U CN220271221U (en) | 2023-08-21 | 2023-08-21 | Device for measuring concentration of solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322247725.8U CN220271221U (en) | 2023-08-21 | 2023-08-21 | Device for measuring concentration of solution |
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| Publication Number | Publication Date |
|---|---|
| CN220271221U true CN220271221U (en) | 2023-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322247725.8U Active CN220271221U (en) | 2023-08-21 | 2023-08-21 | Device for measuring concentration of solution |
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| CN (1) | CN220271221U (en) |
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- 2023-08-21 CN CN202322247725.8U patent/CN220271221U/en active Active
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