CN101782543A - Method for measuring pure water conductivity - Google Patents
Method for measuring pure water conductivity Download PDFInfo
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- CN101782543A CN101782543A CN200910110919A CN200910110919A CN101782543A CN 101782543 A CN101782543 A CN 101782543A CN 200910110919 A CN200910110919 A CN 200910110919A CN 200910110919 A CN200910110919 A CN 200910110919A CN 101782543 A CN101782543 A CN 101782543A
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- pure water
- active power
- effective value
- conductivity
- water conductivity
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Abstract
The invention relates to a method for measuring pure water conductivity. By adopting 200Hz sine wave excitation, the excitation voltage and the detection current are input into the voltage and current ends of the integrated computing chips for single-phase alternating current volume. By the calculation of the computing chips, the effective value and the active power of the alternating voltage can be obtained. The resistance of pure water = Square of the effective value of the alternating voltage/value of active power. The conductivity of the pure water can be calculated according to the distance between the two fluid columns at the poles and the sectional area. With the alternating current excitation conductivity detection, and the detection method of equalizing the values of the phases, the method of the invention can be used to diminish the influence of the distributed capacitances, and has the characteristics of simple circuit structure and high measurement precision.
Description
[technical field]
The present invention relates to a kind of measuring method of pure water conductivity.
[background technology]
Measure pure water conductivity at present following several solution commonly used arranged:
1, simulation phase sensitive detection method: electrode is applied ac-excited source, there is phase differential during by distributed capacitance and dielectric resistance in ac-excited source, pass through phase sensitive detection then, the DC quantity that low-pass filtering obtains is only relevant with dielectric resistance, and irrelevant, thereby reach the purpose of eliminating the distributed capacitance influence with distributed capacitance.
2, the method for double pulse measurement: electrode is applied positive and negative two pulses, measure in end-of-pulsing moment, guarantee that voltage is stable on the distributed capacitance, do not have electric current to flow through, the approximate open circuit of distributed capacitance only has dielectric resistance to work.
More than two kinds of methods to the signal Processing complexity, require the circuit travelling speed fast, it is low to measure synthesis precision.
[summary of the invention]
The invention provides a kind of measuring method of pure water conductivity.
The measuring method of a kind of pure water conductivity of the present invention, adopt the 200HZ sine-wave excitation, voltage, the current terminal of the electric current input single-phase AC electric weight COMPREHENSIVE CALCULATING chip of driving voltage and detection, calculate acquisition alternating voltage effective value and active power by single-phase AC electric weight COMPREHENSIVE CALCULATING chip, this pure water resistance=alternating voltage effective value square/active power, can extrapolate pure water conductivity by the distance of fluid column between conductance cell the two poles of the earth of having measured with sectional area again.
Above-mentioned sine-wave excitation source voltage effective value
The flow through dielectric resistance electric current of conductance electrode:
The flow through electric current of distributed capacitance:
Total current: I=I
R+ I
C
Active power:
Pure water resistance: R=A
2/ P
Pure water conductivity: G=K/R
Wherein, R: pure water dielectric resistance C: distributed capacitance K: electrode constant
Compared with prior art, the present invention adopts ac-excited conductivity to detect, and utilizes to be equivalent to the influence that the digital phase sensitivity detection method is eliminated distributed capacitance, and it is simple to have a circuit structure, the characteristics that measuring accuracy is high.
[description of drawings]
The measurement mechanism connection diagram of Fig. 1 for using among the present invention;
Fig. 2 is conductance electrode equivalent circuit diagram in the pure water conductivity measurement of the present invention.
The invention will be further described below in conjunction with accompanying drawing.
[embodiment]
The measuring method of a kind of pure water conductivity of the present invention, adopt the 200HZ sine-wave excitation, voltage, the current terminal of the electric current input single-phase AC electric weight COMPREHENSIVE CALCULATING chip of driving voltage and detection, calculate acquisition alternating voltage effective value and active power by single-phase AC electric weight COMPREHENSIVE CALCULATING chip, this pure water resistance=alternating voltage effective value square/active power, can extrapolate pure water conductivity by the distance of fluid column between conductance cell the two poles of the earth of having measured with sectional area again.
Be applicable to measurement mechanism of the present invention by sine-wave excitation source 1, resistance pressure-dividing network 2, current/voltage conversion 3, single-phase AC electric weight COMPREHENSIVE CALCULATING chip 4, digital temperature sensor 5, single-chip microcomputer 6, compositions such as display device and button 7 are seen Fig. 1.
In pure water conductivity was measured, the electric capacity that polarization effect produces was ignored, and the conductance electrode equivalent electrical circuit as shown in Figure 2.Sine-wave excitation source 1 output U is to conductance electrode, export A to single-phase AC electric weight COMPREHENSIVE CALCULATING chip 4 current input terminals 41 through current/voltage conversion 3, another road is to resistance pressure-dividing network 2, resistance pressure-dividing network 2 output U1 are to single-phase AC electric weight COMPREHENSIVE CALCULATING chip 4 voltage input ends 42, calculate by ultra high speed A and electric energy in the single-phase AC electric weight COMPREHENSIVE CALCULATING chip 4, the calculating of alternating voltage effective value, output result of calculation " alternating voltage effective value and active power " exist in the register is read by single-chip microcomputer 6.This single-chip microcomputer 6 is done " alternating voltage effective value square divided by active power " computing and is got pure water resistance, electrode constant K gets pure water conductivity divided by pure water resistance, after the measured value that reads digital temperature sensor 5 simultaneously carried out temperature compensation, output was the result show to display device.
Compared with prior art, the present invention is equivalent to the influence that the digital phase sensitivity detection method is eliminated distributed capacitance to adopting ac-excited conductivity to detect to utilize, and it is simple to have a circuit structure, the high characteristics of measuring accuracy.
The flow through dielectric resistance electric current of conductance electrode:
The flow through electric current of distributed capacitance:
Total current: I=I
R+ I
C
Active power:
Pure water resistance: R=A
2/ P
Pure water conductivity: G=K/R
Wherein, R: pure water dielectric resistance C: distributed capacitance K: electrode constant.
Claims (2)
1. the measuring method of a pure water conductivity, it is characterized in that: adopt the 200HZ sine-wave excitation, voltage, the current terminal of the electric current input single-phase AC electric weight COMPREHENSIVE CALCULATING chip of driving voltage and detection, calculate acquisition alternating voltage effective value and active power by single-phase AC electric weight COMPREHENSIVE CALCULATING chip, this pure water resistance=alternating voltage effective value square/active power, can extrapolate pure water conductivity by the distance of fluid column between conductance cell the two poles of the earth of having measured with sectional area again.
2. the measuring method of a kind of pure water conductivity according to claim 1 is characterized in that:
Above-mentioned sine-wave excitation source voltage effective value
The flow through dielectric resistance electric current of conductance electrode:
The flow through electric current of distributed capacitance:
Total current: I=I
R+ I
C
Above-mentioned active power
Pure water resistance: R=A
2/ P
Pure water conductivity: G=K/R
Wherein, R: pure water dielectric resistance C: distributed capacitance K: electrode constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910110919A CN101782543A (en) | 2009-01-19 | 2009-01-19 | Method for measuring pure water conductivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910110919A CN101782543A (en) | 2009-01-19 | 2009-01-19 | Method for measuring pure water conductivity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101782543A true CN101782543A (en) | 2010-07-21 |
Family
ID=42522624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910110919A Pending CN101782543A (en) | 2009-01-19 | 2009-01-19 | Method for measuring pure water conductivity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101782543A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986162A (en) * | 2010-08-26 | 2011-03-16 | 东北大学 | Device and method for measuring conductivity of industrial aluminum electrolyte on line |
| CN102830143A (en) * | 2012-08-24 | 2012-12-19 | 福建师范大学 | Method and key circuit for measuring solution conductivity through triangular wave excitation and integral processing |
| CN103364639A (en) * | 2013-06-25 | 2013-10-23 | 西安热工研究院有限公司 | Measurement method for solution resistance in dynamic pure water system metal corrosion electrochemical measurement |
| CN105954485A (en) * | 2016-04-29 | 2016-09-21 | 上海海纳通物联网科技有限公司 | Method for monitoring TDS water quality power circuit |
| CN106199204A (en) * | 2016-07-27 | 2016-12-07 | 武汉诚迈科技有限公司 | A kind of electrical conductivity of solution measuring instruments based on microcontroller |
| CN108169286A (en) * | 2018-01-08 | 2018-06-15 | 中国电子科技集团公司第二十四研究所 | A kind of preparation method and product for trichloroethylene solvent conductivity test probe |
-
2009
- 2009-01-19 CN CN200910110919A patent/CN101782543A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986162A (en) * | 2010-08-26 | 2011-03-16 | 东北大学 | Device and method for measuring conductivity of industrial aluminum electrolyte on line |
| CN101986162B (en) * | 2010-08-26 | 2013-01-02 | 东北大学 | Device and method for measuring conductivity of industrial aluminum electrolyte on line |
| CN102830143A (en) * | 2012-08-24 | 2012-12-19 | 福建师范大学 | Method and key circuit for measuring solution conductivity through triangular wave excitation and integral processing |
| CN103364639A (en) * | 2013-06-25 | 2013-10-23 | 西安热工研究院有限公司 | Measurement method for solution resistance in dynamic pure water system metal corrosion electrochemical measurement |
| CN103364639B (en) * | 2013-06-25 | 2016-06-29 | 西安热工研究院有限公司 | The measuring method of solution resistance in dynamic pure aquatic system metal corrosion electrochemical measurement |
| CN105954485A (en) * | 2016-04-29 | 2016-09-21 | 上海海纳通物联网科技有限公司 | Method for monitoring TDS water quality power circuit |
| CN105954485B (en) * | 2016-04-29 | 2017-12-26 | 上海海纳通物联网科技有限公司 | A kind of circuit with monitoring TDS water quality functions |
| CN106199204A (en) * | 2016-07-27 | 2016-12-07 | 武汉诚迈科技有限公司 | A kind of electrical conductivity of solution measuring instruments based on microcontroller |
| CN108169286A (en) * | 2018-01-08 | 2018-06-15 | 中国电子科技集团公司第二十四研究所 | A kind of preparation method and product for trichloroethylene solvent conductivity test probe |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100721 |