CN103529088A - Portable acid-base concentration measuring device and measuring method - Google Patents
Portable acid-base concentration measuring device and measuring method Download PDFInfo
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- CN103529088A CN103529088A CN201310460256.6A CN201310460256A CN103529088A CN 103529088 A CN103529088 A CN 103529088A CN 201310460256 A CN201310460256 A CN 201310460256A CN 103529088 A CN103529088 A CN 103529088A
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Abstract
The invention discloses a portable acid-base concentration measuring device and a measuring method. The measuring device comprises an acid-base concentration electrode and a pulse electrical conductivity measurement system; the acid-base concentration electrode comprises an electrode core and an electrode bushing, the electrode bushing is sleevedly arranged on the electrode core, an annular measurement channel is formed between the electrode bushing and the electrode core, and the electrode core is connected with the input end of the pulse electrical conductivity measurement system. The novel portable acid-base concentration measuring device can measure more than 7 commonly used acid-base concentrations with the measuring concentration range of 0-15% and the reading value accuracy degree of +/-2%. The device adopts a waterproof design, and is suitable for use in production sites and laboratories.
Description
Technical field
The present invention relates to a kind of electrochemical apparatus, be specifically related to acid base concentration measurement mechanism.
Background technology
In commercially available electrochemical apparatus, portable and desk-top acid-base concentration meter seldom, because the measurement of acid base concentration adopts measurement conductivity conventionally, then is scaled the method for acid base concentration.Because the conductivity of acid-base solution is very large, the acid-base solution conductivity of high concentration approaches 1000mS/cm, when adopting the conductance electrode that electrode constant is 1, solution resistance only has several ohm, the current density that flows through electrode surface is quite large, can there are serious polarization phenomena in electrode when measuring, and so little resistance is also not easy to measure accurately in addition.
Address the above problem, must adopt the conductance electrode of electrode constant 10-50, make solution resistance increase 10-50 doubly, and common such electrode volume is larger, uses inconvenience in portable and desk-top instrument.
Summary of the invention
For existing acid base concentration measurement mechanism, have that volume is large, inconvenient problem with use, the object of the present invention is to provide a kind of novel portable or desk-top acid base concentration measurement mechanism, to facilitate user to measure the acid base concentration value of solution in production scene.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of portable acid base concentration measurement mechanism, described measurement mechanism comprises that acid base concentration electrode and pulse conductivity measurement system form, described acid base concentration electrode comprises electrode cores and electrode sleeve pipe, described electrode sleeve pipe box is located in electrode cores, and between electrode cores, form ring-type and measure passage, the input end of described electrode cores and pulse conductivity measurement system joins.
In preferred embodiment of the present invention, dismountable being set in electrode cores of described electrode sleeve pipe.
Further, described electrode cores is comprised of electrode stem, the first ring-type platinum electrode, electrode body, the second ring-type platinum electrode, electrode tip and temperature sensor, described the first ring-type platinum electrode, electrode body, the second ring-type platinum electrode, electrode tip are successively set on electrode stem, described temperature sensor is arranged in electrode tip, and wherein the first ring-type platinum electrode, the second ring-type platinum electrode and temperature sensor output terminal are connected to the input end of pulse conductivity measurement system.
Further, the lead-in wire of described the first ring-type platinum electrode, the second ring-type platinum electrode and temperature sensor output terminal is drawn with four-core shielding line and is connected from electrode stem center, and four-core shielding line is connected to the input end of pulse conductivity measurement system by waterproof plug.
Further, described pulse conductivity measurement system comprises temperature-measuring module, microprocessor, follower, current amplifier and display, described microprocessor control linkage temperature-measuring module, follower, current amplifier and display, temperature sensor in described temperature-measuring module and electrode cores is connected, follower and the first ring-type platinum electrode are connected, and current amplifier and the second ring-type platinum electrode are connected.
Further, described microprocessor is MSP430 microprocessor.
Further, described acid base concentration electrode is the acid base concentration electrode of conductivity measurement scope 2-2000mS/cm.
As the second object of the present invention, the present invention is based on above-mentioned measurement mechanism a kind of acid base concentration measuring method is also provided, the method utilizes electrode sleeve pipe when electrode is used, make two ring-type platinum electrodes and the isolation of outside electrolytic solution in electrode cores, utilize by the ring-type forming between electrode cores and electrode sleeve pipe and measure passage as the measurement current channel between two ring-type platinum electrodes.
In portable or desk-top acid base concentration measurement mechanism provided by the invention, electrode is in the situation that keeping identical with common conductance electrode physical dimension, electrode constant brings up to 10 or be greater than 10 from 1, effectively reduced the current density of electrode surface, eliminate the error that electrode polarization is measured high conductivity, not only overcome the problem of the high conductivity measurement difficulty of acid-base solution, and make acid base concentration measurement mechanism volume very small and exquisite, facilitate in-site measurement needs.
This measurement mechanism can be measured 7 kinds of above common acid alkali concns, measures concentration range 0-15%, accuracy ± 2% reading value; Whole measurement mechanism adopts waterproofing design, is applicable to production scene and laboratory and uses.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention.
Fig. 1 is the schematic diagram of acid base concentration potential electrode in the present invention;
Fig. 2 is the composition structural representation of acid base concentration potential electrode in the present invention;
Fig. 3 is the structural representation of electrode cores in acid base concentration potential electrode;
Fig. 4 is the structural representation of electrode sleeve pipe in acid base concentration potential electrode;
Fig. 5 is the system chart of pulse conductivity measurement system in the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Portable and desk-top acid base concentration measurement mechanism provided by the invention is mainly comprised of acid base concentration electrode (as shown in Figure 1) corrosion-resistant, capable of washing and the pulse conductivity measurement system (as shown in Figure 5) of conductivity measurement scope 2-2000mS/cm.
Referring to Fig. 2, acid base concentration electrode is mainly comprised of electrode cores 100 and electrode sleeve pipe 200, wherein electrode sleeve pipe 200 adopts dismountable mode to be set in electrode cores 100, and between electrode cores, form ring-type and measure passage 201, the output terminal of electrode cores 100 and pulse conductivity measurement system 300(are as shown in Figure 5 simultaneously) input end join.
Referring to Fig. 3, electrode cores 100 is mainly by electrode stem 101, the first ring-type platinum electrode 102, electrode body 103, the second ring-type platinum electrode 104, electrode tip 105 and temperature sensor 106 mix proportions.
Wherein, the first ring-type platinum electrode 102, electrode body 103, the second ring-type platinum electrode 104, electrode tip 105 are successively set on electrode stem 101, and simultaneous temperature sensor 106 is arranged in electrode tip 105, forms thus the electrode cores in acid base concentration electrode.
Concrete, electrode stem 101 for xsect be the hollow structure of T shape, the arranged outside of the large end 1011 in its top has screw thread, offers the electrode body resettlement groove 1013 with electrode stem 101 inner hollow structure conductings on small end 1012.
The top 1052 of electrode tip 105 is link, and for xsect is the boss-shaped of " protruding " font, the electrode tip on itself and electrode body bottom 1032 is assigned groove 1033 corresponding matching.Electrode tip 105 assigns groove 1033 to coordinate by top with the electrode tip on electrode body bottom 1032, assigns on electrode body bottom 1032.Simultaneously electrode tip 105 is along be provided with a temperature sensor resettlement groove 1051 on its bearing of trend to bottom by top, and the length of the degree of depth of this resettlement groove 1051 and electrode tip 5 is approaching, to guarantee the precision of temperature sensor measurement.
The first ring-type platinum electrode 102 is set in the junction between electrode body 103 and electrode stem 101; The second ring-type platinum electrode 104 is set in the junction between electrode body 103 and electrode tip 105.
Lead-in wire 1021,1041 and the 1061 inner hollow structures by electrode body 3 of the first ring-type platinum electrode 102, the second ring-type platinum electrode 104 and temperature sensor 106 output terminals are drawn with four-core shielding line and are connected from electrode stem 1 center of hollow, and four-core shielding line is connected to the corresponding input end of pulse conductivity measurement system by waterproof plug.
Referring to Fig. 4, for the electrode cores 100 that coordinates above-mentioned scheme to form, the top port 202 of electrode sleeve pipe 200 is provided with screw thread and coordinates with the large end 1011 of electrode stem 101 in electrode cores 100, and joins with its screw thread, and realization is detachably joined with electrode cores 100; Meanwhile, the degree of depth of electrode sleeve pipe 200, size coordinate with electrode cores 100, and electrode sleeve pipe 200 can be set in electrode cores 100, and between forms ring-type measurement passage 201(as shown in Figure 2).
The acid base concentration electrode being formed by such scheme, utilize dismountable electrode sleeve pipe 200, when electrode is used, make two ring-type platinum electrodes and the isolation of outside electrolytic solution in electrode cores, measurement current channel between them can only be that the ring-type being formed by electrode cores and electrode sleeve pipe is measured passage 201, thereby the present situation that electrode parameter is determined by electrode size is changed into by solution measurement current channel (being that ring-type is measured passage 201) decision, and its concrete principle is as follows:
It is electrode constant K=L/A that conductance electrode has an important parameter, in existing scheme, two platinum electrodes of conductance electrode are immersed in solution, equal the area A of platinum electrode between them by measuring the solution sectional area A of electric current ', electrode constant K=L/A=L/A '.In the situation that detected solution conductivity is very large, in order to reduce the current density of electrode surface, need to increase electrode area, in order to keep electrode constant constant or make electrode constant larger, the distance L between electrode will have to greatly increase.Make electrode not there is practicality and convenience.
And, in this programme, by electrode sleeve pipe, make by measuring the solution sectional area A of electric current and the area A of platinum electrode ' irrelevant.For example,, in this programme, by measuring the solution sectional area A=0.2cm of electric current
2, L=2cm, K=L/A=2/0.2=10, and the area A of platinum electrode ' and=1.2cm
2.
Thus, acid base concentration electrode in this programme can be in the situation that keeping identical with common conductance electrode physical dimension, electrode constant brings up to 10 or be greater than 10 from 1, thereby can effectively reduce the current density of electrode surface, eliminate the error that electrode polarization is measured high conductivity, greatly facilitating in-site measurement needs.
Moreover generally, the conductance electrode surface of existing measurement high-conductivity solution need to plate one deck platinum black further to increase electrode surface area, reduce the impact of electrode polarization.Because platinum black is a kind of metal platinum of impalpable powder powder, so the black electrode surface of platinum plating can not clean in wiping.And the electrode area of the existing electrode constant 10 of platinum electrode Area Ratio on acid base concentration electrode in this programme has increased 24 times, in the situation that not platinum plating is black, meets the requirement of high concentrated acid aqueous slkali conductivity measurement completely.
Meanwhile, in this programme, electrode sleeve pipe adopts dismountable plan of establishment, can pull down electrode sleeve pipe so in use, can clean easily platinum electrode surface.
Referring to Fig. 5, it is depicted as the system chart of the pulse conductivity measurement system that above-mentioned acid base concentration electrode is used in conjunction with.This system coordinates employing impulsive measurement method to carry out the measurement of acid base concentration with acid base concentration electrode.
As figure shows, this measuring system 300 is mainly comprised of microprocessor 301, temperature measuring circuit 302, follower 303, current amplifier 304 and display 305.
The Data processing that wherein microprocessor 301 is whole measuring system, it specifically adopts MSP430 microprocessor, control linkage temperature measuring circuit 302, follower 303, current amplifier 304 and display 305; And temperature measuring circuit 302 is connected with the temperature sensor 106 in electrode cores, follower 303 and the first ring-type platinum electrode 102 are connected, current amplifier 304 and the second ring-type platinum electrode 104 are connected.
Thus, when pulse conductivity measurement system 300 is measured, by MSP430 microprocessor 301, producing frequency is 5 KHz alternating-current pulses, through follower 303, be added on the first ring-type platinum electrode 102, the electric current passing through in the detected solution between the first ring-type platinum electrode 102 and the second ring-type platinum electrode 104 is directly proportional to the conductivity of solution.This electric current is amplified by current amplifier 304 and is converted to voltage is sampled by the built-in A/D converter of MSP430 microprocessor 301, obtains electrical conductivity of solution reading.
When measuring conductivity, by temperature measuring circuit 302, by the built-in temperature sensor 106 of acid base concentration potential electrode 100, measured the temperature value of solution, MSP430 microprocessor 301 carries out temperature compensation according to solution temperature to conductivity value, the conductivity value recording at temperature is at that time converted into the conductivity value under reference temperature, finally according to the corresponding relation of acid base concentration and conductivity directly by display 305 demonstration acid-base solution percentage concentrations.
As from the foregoing, acid base concentration measurement mechanism that this programme provides has overcome the problem of the high conductivity measurement difficulty of acid-base solution, it adopts electrode method simply and easily directly to measure acid base concentration, make device volume very small and exquisite, light, device adopts powered battery to be adapted at production scene and laboratory is used.
The conductance method adopting is a kind of stable and measuring method reliably, thereby device does not need frequent calibration, only need to and carry out every half a year or 1 year primary calibration before using first.During calibration, need compound concentration be 1% and 10% two kind of solution carry out 2 calibrations, after calibration, electrode being immersed to solution to be measured can measure.
In order to verify the measurement effect of portable and desk-top acid base concentration measurement mechanism, as follows to conventional standard acid solution and basic solution measurement of concetration result with this device:
Table 1 hydrochloric acid
| ? | Concentration of standard solution (%) | 1 | 3 | 6 | 9 | 12 | 15 |
| ? | Measured concentration (%) | 1.02 | 3.05 | 5.94 | 8.87 | 11.90 | 14.88 |
| ? | Absolute error (%) | 0.02 | 0.05 | -0.06 | -0.13 | -0.1 | -0.12 |
Table 2 NaOH
| ? | Concentration of standard solution (%) | 1 | 3 | 6 | 9 | 12 | 15 |
| ? | Measured concentration (%) | 1.04 | 2.97 | 5.91 | 9.11 | 11.85 | 14.82 |
| ? | Absolute error (%) | 0.04 | -0.03 | -0.09 | 0.11 | -0.15 | -0.18 |
Known by the thermometrically result in two tables above, this measurement mechanism can be measured multiple common acid alkali concn, measures concentration range 0-15%, accuracy ± 2% reading value, and superior performance, is applicable to production scene and laboratory and uses.
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (8)
1. a portable acid base concentration measurement mechanism, described measurement mechanism comprises that acid base concentration electrode and pulse conductivity measurement system form, it is characterized in that, described acid base concentration electrode comprises electrode cores and electrode sleeve pipe, described electrode sleeve pipe box is located in electrode cores, and between electrode cores, form ring-type and measure passage, the input end of described electrode cores and pulse conductivity measurement system joins.
2. a kind of portable acid base concentration measurement mechanism according to claim 1, is characterized in that, dismountable being set in electrode cores of described electrode sleeve pipe.
3. a kind of portable acid base concentration measurement mechanism according to claim 1, it is characterized in that, described electrode cores is comprised of electrode stem, the first ring-type platinum electrode, electrode body, the second ring-type platinum electrode, electrode tip and temperature sensor, described the first ring-type platinum electrode, electrode body, the second ring-type platinum electrode, electrode tip are successively set on electrode stem, described temperature sensor is arranged in electrode tip, and wherein the first ring-type platinum electrode, the second ring-type platinum electrode and temperature sensor output terminal are connected to the input end of pulse conductivity measurement system.
4. a kind of portable acid base concentration measurement mechanism according to claim 3, it is characterized in that, the lead-in wire of described the first ring-type platinum electrode, the second ring-type platinum electrode and temperature sensor output terminal is drawn with four-core shielding line and is connected from electrode stem center, and four-core shielding line is connected to the input end of pulse conductivity measurement system by waterproof plug.
5. a kind of portable acid base concentration measurement mechanism according to claim 1 and 2, it is characterized in that, described pulse conductivity measurement system comprises temperature-measuring module, microprocessor, follower, current amplifier and display, described microprocessor control linkage temperature-measuring module, follower, current amplifier and display, temperature sensor in described temperature-measuring module and electrode cores is connected, follower and the first ring-type platinum electrode are connected, and current amplifier and the second ring-type platinum electrode are connected.
6. a kind of portable acid base concentration measurement mechanism according to claim 5, is characterized in that, described microprocessor is MSP430 microprocessor.
7. a kind of portable acid base concentration measurement mechanism according to claim 1, is characterized in that, described acid base concentration electrode is the acid base concentration electrode of conductivity measurement scope 2-2000mS/cm.
8. an acid base concentration measuring method, it is characterized in that, the method utilizes electrode sleeve pipe when electrode is used, make two ring-type platinum electrodes and the isolation of outside electrolytic solution in electrode cores, utilize by the ring-type forming between electrode cores and electrode sleeve pipe and measure passage as the measurement current channel between two ring-type platinum electrodes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092653A (en) * | 2014-05-23 | 2015-11-25 | 翰信科技股份有限公司 | Detector for detecting sodium hypochlorite concentration |
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2013
- 2013-09-29 CN CN201310460256.6A patent/CN103529088B/en active Active
Patent Citations (4)
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| US5134376A (en) * | 1989-10-28 | 1992-07-28 | Horiba, Ltd. | A solution specific conductivity meter and method for use |
| CN2225690Y (en) * | 1995-07-17 | 1996-04-24 | 许一鸣 | Sensor for conductivity |
| CN201014985Y (en) * | 2007-01-29 | 2008-01-30 | 江苏江分电分析仪器有限公司 | Graphite conductive electrode |
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Cited By (1)
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| CN105092653A (en) * | 2014-05-23 | 2015-11-25 | 翰信科技股份有限公司 | Detector for detecting sodium hypochlorite concentration |
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