CN103529088B - A kind of portable acid base concentration measurement mechanism and measuring method - Google Patents
A kind of portable acid base concentration measurement mechanism and measuring method Download PDFInfo
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- CN103529088B CN103529088B CN201310460256.6A CN201310460256A CN103529088B CN 103529088 B CN103529088 B CN 103529088B CN 201310460256 A CN201310460256 A CN 201310460256A CN 103529088 B CN103529088 B CN 103529088B
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Abstract
The invention discloses a kind of portable acid base concentration measurement mechanism and measuring method, this measurement mechanism comprises acid base concentration electrode and pulse conductivity measurement system composition, wherein, 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 of described electrode cores and pulse conductivity measurement system joins. This novel portable acid base concentration measurement mechanism can be measured more than 7 kinds common acid alkali concn, measures concentration range 0-15%, the degree of accuracy ± 2% reading value. Instrument adopts waterproofing design, is applicable to production scene and laboratory and uses.
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 is little, because acid base concentrationMeasure conventionally and adopt and measure electrical conductivity, then be scaled the method for acid base concentration. Because the electricity of acid-base solution is ledRate is very large, and the acid-base solution electrical conductivity of high concentration approaches 1000mS/cm, is 1 when adopting electrode constantConductance electrode time, 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 in the time measuring, and so little resistance is also not easy to measure accurate in additionReally.
Address the above problem, must adopt the conductance electrode of electrode constant 10-50, solution resistance is increasedAdd 10-50 doubly, and common such electrode volume is larger, in portable and desk-top instrument, uses notJust.
Summary of the invention
Have for existing acid base concentration measurement mechanism that volume is large, inconvenient problem with use, of the present inventionObject is to provide a kind of novel portable or desk-top acid base concentration measurement mechanism, to facilitate user giving birth toProduce the acid base concentration value of in-site measurement solution.
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 acid base concentration electrode and arteries and veinsRush conductivity measurement system composition, described acid base concentration electrode comprises electrode cores and electrode sleeve pipe, described electricityUtmost point casing pipe sleeve is located in electrode cores, and between electrode cores, forms ring-type measurement passage, described electrode cores and arteries and veinsThe input that rushes 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 by electrode stem, the first ring-type platinum electrode, electrode body, the second ringShape platinum electrode, electrode tip and temperature sensor composition, described the first ring-type platinum electrode, electrode body,The second ring-type platinum electrode, electrode tip are successively set on electrode stem, and described temperature sensor is arranged on electricityIn cartridge, wherein the first ring-type platinum electrode, the second ring-type platinum electrode and temperature sensor outputBe connected to the input of pulse conductivity measurement system.
Further, described the first ring-type platinum electrode, the second ring-type platinum electrode and temperature sensorThe lead-in wire of output is drawn with four-core shielding line and is connected from electrode stem center, and four-core shielding line is by anti-water cuttingHead is connected to the input of pulse conductivity measurement system.
Further, described pulse conductivity measurement system comprises temperature-measuring module, microprocessor, followsWith device, current amplifier and display, described microprocessor control connection temperature-measuring module, followDevice, current amplifier and display, the temperature sensor phase in described temperature-measuring module and electrode coresConnection, follower and the first ring-type platinum electrode are connected, current amplifier and the second ring-type platinum electrodeBe connected.
Further, described microprocessor is MSP430 microprocessor.
Further, the soda acid that described acid base concentration electrode is conductivity measurement scope 2-2000mS/cmConcentration electrode.
As the second object of the present invention, the present invention is based on above-mentioned measurement mechanism a kind of acid base concentration is also providedMeasuring method, the method utilizes electrode sleeve pipe in the time that electrode uses, and makes two ring-type platinum in electrode coresElectrode and the isolation of outside electrolyte, utilize by the ring-type forming between electrode cores and electrode sleeve pipe and measure passageAs 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 keeping and common electricityIn the identical situation of conductive electrode appearance and size, electrode constant brings up to 10 or be greater than 10 from 1, effectivelyReduce the current density of electrode surface, eliminated the error that electrode polarization is measured high conductivity, not only gramTake the problem of the high conductivity measurement difficulty of acid-base solution, and made acid base concentration measurement mechanism volumeVery small and exquisite, facilitate in-site measurement needs.
This measurement mechanism can be measured more than 7 kinds common acid alkali concn, measures concentration range 0-15%, standardExactness ± 2% reading value; Whole measurement mechanism adopts waterproofing design, is applicable to production scene and laboratory and makesWith.
Brief description of the drawings
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the schematic diagram of acid base concentration measurement electrode in the present invention;
Fig. 2 is the composition structural representation of acid base concentration measurement electrode in the present invention;
Fig. 3 is the structural representation of electrode cores in acid base concentration measurement electrode;
Fig. 4 is the structural representation of electrode sleeve pipe in acid base concentration measurement electrode;
Fig. 5 is the system block diagram of pulse conductivity measurement system in the present invention.
Detailed description of the invention
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understandSeparate, 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 by conductivity measurement scopeAcid base concentration electrode (as shown in Figure 1) and the Pulse Electric corrosion-resistant, capable of washing of 2-2000mS/cm are ledRate measuring system (as shown in Figure 5) composition.
Referring to Fig. 2, acid base concentration electrode is mainly made up of electrode cores 100 and electrode sleeve pipe 200, whereinElectrode sleeve pipe 200 adopts dismountable mode to be set in electrode cores 100, and forms ring between electrode coresShape is measured passage 201, simultaneously the output of electrode cores 100 and pulse conductivity measurement system 300(asShown in Fig. 5) input join.
Referring to Fig. 3, electrode cores 100 is mainly by electrode stem 101, the first ring-type platinum electrode 102, electrodeBody 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, electricityCartridge 105 is successively set on electrode stem 101, and simultaneous temperature sensor 106 is arranged on electrode tip 105In, form thus the electrode cores in acid base concentration electrode.
Concrete, electrode stem 101 for cross section be the hollow structure of T shape, the large end 1011 in its topArranged outside has screw thread, offers the electricity with electrode stem 101 inner hollow structure conductings on small end 1012Polar body resettlement groove 1013.
Electrode body 103 is equally also the structure of inner hollow, and inner through hole is used for holding associated lead to be passed through.The top 1031 of electrode body 103 is the boss-shaped of " protruding " font for cross section, and with electrode stem 101Resettlement groove 1013 on small end coordinates; Its bottom 1032 is for offering and electrode body 103 inner hollow knotsThe electrode tip of structure conducting is assigned groove 1033. Electrode body 103 coordinates with electrode stem 101 small ends by top,Assign in electrode stem 101.
The top 1052 of electrode tip 105 is link, for cross section is the boss-shaped of " protruding " font, itsAssign groove 1033 corresponding matching with the electrode tip on electrode body bottom 1032. Electrode tip 105 passes through topAssign groove 1033 to coordinate with the electrode tip on electrode body bottom 1032, assign into electrode body bottom 1032On. Electrode tip 105 is being pacified along be provided with a temperature sensor on its bearing of trend to bottom by top simultaneouslyPut groove 1051, the length of the degree of depth of this resettlement groove 1051 and electrode tip 5 approaches, to ensure TEMPThe precision that device is measured.
Temperature sensor 106 is placed in the resettlement groove 1051 of electrode tip 105, for measuring solution temperatureDegree.
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.
The first ring-type platinum electrode 102, the second ring-type platinum electrode 104 and temperature sensor 106 are defeatedThe lead-in wire 1021,1041 and 1061 that goes out end passes through the inner hollow structure of electrode body 3 from the electricity of hollowUtmost point bar 1 center is drawn with four-core shielding line and is connected, and four-core shielding line is connected to Pulse Electric by waterproof plugThe corresponding input of conductance measuring system.
Referring to Fig. 4, for the electrode cores 100 that coordinates above-mentioned scheme to form, the top of electrode sleeve pipe 200Portion's port 202 is provided with screw thread and coordinates with the large end 1011 of electrode stem 101 in electrode cores 100, and withIts screw thread joins, and realization is detachably joined with electrode cores 100; Meanwhile, the degree of depth of electrode sleeve pipe 200,Size coordinates with electrode cores 100, and electrode sleeve pipe 200 can be set in electrode cores 100, andForm ring-type between the two and measure passage 201(as shown in Figure 2).
The acid base concentration electrode being formed by such scheme, utilizes dismountable electrode sleeve pipe 200, at electrodeWhen use, make two ring-type platinum electrodes and the isolation of outside electrolyte in electrode cores, the survey between themAmount current channel can only be that the ring-type being formed by electrode cores and electrode sleeve pipe is measured passage 201, thereby makesThe present situation that electrode parameter is determined by electrode size is changed into and measured current channel by solution (is that ring-type measurement is logicalRoad 201) determine, its concrete principle is as follows:
It is electrode constant K=L/A that conductance electrode has an important parameter, in existing scheme, and conductance electrodeTwo platinum electrodes be immersed in solution, between them by measuring the solution sectional area A of electric currentEqual the area A of platinum electrode ', electrode constant K=L/A=L/A '. Very large in detected solution electrical conductivityIn situation, in order to reduce the current density of electrode surface, need to increase electrode area, in order to keep electrodeConstant is constant or make electrode constant larger, and the distance L between electrode will have to greatly increase. Make electrodeDo not there is practicality and convenience.
And, in this programme, by electrode sleeve pipe, make solution sectional area A and platinum by measuring electric currentThe area A of electrode ' irrelevant. For example,, in this programme, by measuring the solution sectional area A=of electric current0.2cm2, L=2cm, K=L/A=2/0.2=10, and the area A of platinum electrode ' and=1.2cm2。
Thus, the acid base concentration electrode in this programme can keep and common conductance electrode appearance and size phaseWith situation under, electrode constant brings up to 10 or be greater than 10 from 1, thereby can effectively reduce electricityThe extremely current density on surface, eliminates the error that electrode polarization is measured high conductivity, greatly facilitates on-the-spotMeasure and need.
Moreover generally, the conductance electrode surface of existing measurement high-conductivity solution need to plateOne deck platinum black, further to increase electrode surface area, reduces the impact of electrode polarization. Because platinum black is a kind ofThe metal platinum of impalpable powder powder, the electrode surface that therefore platinum plating is black can not clean in wiping. And this programmeIn acid base concentration electrode on the existing electrode constant 10 of platinum electrode Area Ratio electrode area increase24 times, in the situation that not platinum plating is black, meet completely the conductivity measurement of high concentrated acid aqueous slkali wantAsk.
Meanwhile, in this programme, electrode sleeve pipe adopts dismountable plan of establishment, so in use canPull down electrode sleeve pipe, can clean easily platinum electrode surface.
Referring to Fig. 5, it is depicted as the pulse conductivity measurement system that above-mentioned acid base concentration electrode is used in conjunction withSystem block diagram. This system coordinates employing impulsive measurement method to carry out the survey of acid base concentration with acid base concentration electrodeAmount.
As figure shows, this measuring system 300 mainly by microprocessor 301, temperature measuring circuit 302,Follower 303, current amplifier 304 and display 305 form.
The Data processing that wherein microprocessor 301 is whole measuring system, it specifically adopts MSP430Microprocessor, control connection temperature measuring circuit 302, follower 303, current amplifier 304 andDisplay 305; And temperature measuring circuit 302 is connected, follows with the temperature sensor 106 in electrode coresBe connected with device 303 and the first ring-type platinum electrode 102, current amplifier 304 and the second ring-type platinumElectrode 104 is connected.
Thus, when pulse conductivity measurement system 300 is measured, by MSP430 microprocessor 301Producing frequency is 5 KHz alternating-current pulses, be added on the first ring-type platinum electrode 102 through follower 303,In detected solution between the first ring-type platinum electrode 102 and the second ring-type platinum electrode 104, pass throughElectric current is directly proportional to the electrical conductivity of solution. This electric current is amplified by current amplifier 304 and is converted to voltageSampled by the A/D converter that MSP430 microprocessor 301 is built-in, obtain electrical conductivity of solution reading.
In measuring electrical conductivity, pass through acid base concentration measurement electrode 100 by temperature measuring circuit 302Built-in temperature sensor 106 is measured the temperature value of solution, and MSP430 microprocessor 301 is according to solutionTemperature is carried out temperature-compensating to conductivity value, and the conductivity value recording at temperature is at that time converted into benchmark temperatureThe conductivity value that degree is lower, finally according to the corresponding relation of acid base concentration and electrical conductivity directly by display 305Show acid-base solution percentage concentration.
As from the foregoing, the acid base concentration measurement mechanism that this programme provides has overcome the high electricity of acid-base solution leadsRate is measured difficult problem, and it adopts electrode method simply and easily directly to measure acid base concentration, makes dressPut 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 that one is stablized and reliable measuring method, thereby device does not need frequent schoolStandard, only need to used first front and carry out every half a year or 1 year primary calibration. When calibration, need to prepare denseDegree be 1% and 10% two kind of solution carry out 2 calibrations, after calibration, electrode being immersed to solution to be measured can enterRow is measured.
In order to verify the measurement effect of portable and desk-top acid base concentration measurement mechanism, with this device to conventionalStandard acid solution and basic solution measurement of concetration result as follows:
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 |
From above two table in thermometrically result, this measurement mechanism can be measured multiple conventional soda acidConcentration, measures concentration range 0-15%, the degree of accuracy ± 2% reading value, and superior performance, is applicable to producing existingField and laboratory are used.
More than show and described general principle of the present invention, principal character and advantage of the present invention. One's own professionThe technical staff of industry should understand, and the present invention is not restricted to the described embodiments, above-described embodiment and explanationThat in book, 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 into claimed model of the present inventionIn enclosing. The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (6)
1. a portable acid base concentration measurement mechanism, described measurement mechanism comprise acid base concentration electrode andPulse conductivity measurement system composition, is characterized in that, described acid base concentration electrode comprises electrode cores and electrodeSleeve pipe, described electrode sleeve pipe box is located in electrode cores, and between electrode cores, forms ring-type measurement passage, described inThe input of electrode cores and pulse conductivity measurement system joins;
Described electrode cores by electrode stem, the first ring-type platinum electrode, electrode body, the second ring-type platinum electrode,Electrode tip and temperature sensor composition, described the first ring-type platinum electrode, electrode body, the second ring-type platinumElectrode, electrode tip are successively set on electrode stem, and described temperature sensor is arranged in electrode tip, Qi ZhongOne ring-type platinum electrode, the second ring-type platinum electrode and temperature sensor output are connected to Pulse Electric conductanceThe input of measuring system;
Electrode stem is that cross section is the hollow structure of T shape, and the arranged outside of its large end in top has screw thread, small endOn offer and the electrode body resettlement groove of electrode stem inner hollow structure conducting;
Described electrode body is the structure of inner hollow, and inner through hole is used for holding associated lead to be passed through, electrode bodyTop be the boss-shaped that cross section is " protruding " font, and coordinate with the resettlement groove on the small end of electrode stem; ItsBottom is to offer with the electrode tip of electrode body inner hollow structure conducting to assign groove, electrode body by top withElectrode stem small end coordinates, and assigns in electrode stem;
In described measurement mechanism, utilize electrode sleeve pipe in the time that electrode uses, make two ring-type platinum in electrode coresElectrode and the isolation of outside electrolyte, utilize by the ring-type measurement passage forming between electrode cores and electrode sleeve pipe and doBe two measurement current channels between ring-type platinum electrode.
2. the portable acid base concentration measurement mechanism of one according to claim 1, is characterized in that,Dismountable being set in electrode cores of described electrode sleeve pipe.
3. the portable acid base concentration measurement mechanism of one according to claim 1, 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 is from electricityJi Gan draws at center with four-core shielding line and is connected, and four-core shielding line is connected to Pulse Electric conductance by waterproof plugThe input of measuring system.
4. the portable acid base concentration measurement mechanism of one according to claim 1 and 2, its feature existsComprise that in, described pulse conductivity measurement system temperature-measuring module, microprocessor, follower, electric current putLarge device and display, described microprocessor control connection temperature-measuring module, follower, current amplifierAnd display, the temperature sensor in described temperature-measuring module and electrode cores is connected, follower andOne ring-type platinum electrode is connected, and current amplifier and the second ring-type platinum electrode are connected.
5. the portable acid base concentration measurement mechanism of one according to claim 4, is characterized in that,Described microprocessor is MSP430 microprocessor.
6. the portable acid base concentration measurement mechanism of one 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.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN203490194U (en) * | 2013-09-29 | 2014-03-19 | 上海三信仪表厂 | Portable type acid-base concentration measuring device |
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- 2013-09-29 CN CN201310460256.6A patent/CN103529088B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN203490194U (en) * | 2013-09-29 | 2014-03-19 | 上海三信仪表厂 | Portable type acid-base concentration measuring device |
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