Measuring method of electroconductivity of water

A measurement method and conductivity technology, applied in the direction of fluid resistance measurement, material resistance, material impedance, etc., can solve the problems of equipment manufacturing difficulty and cost increase, practical difficulty, increase processing difficulty, etc., and achieve the elimination of capacitance effect and influence Effect

Inactive Publication Date: 2006-11-22
SUZHOU UNIV
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Problems solved by technology

In the article "Dynamic Pulse Generation Method for Measuring High-Purity Water Conductivity" (Industrial Instruments and Automation Devices, No. 5, 1999), Kaipei Liu et al. provided a method for measuring conductivity using dynamic pulses. Reduce the influence of polarization, but it is also pointed out in the article that the influence of pulse width is different for different measured solutions, which causes difficulties in the practical use of this method. At the same time, this method needs to generate dynamic pulses, which also Increased difficulty and cost of equipment manufacturing
In the Chinese patent application CN1459629A, a method for measuring the conductivity of a solution is disclosed. The conductivity is calculated indirectly through the measurement of active power. This method needs to be calculated by time integration, which increases the difficulty of processing.

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  • Measuring method of electroconductivity of water
  • Measuring method of electroconductivity of water
  • Measuring method of electroconductivity of water

Examples

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Embodiment 1

[0041] Embodiment one: a kind of measuring method of the electrical conductivity of water, add frequency to the two poles of conductivity cell respectively and be ω a and ω b sinusoidal signal, where, ω b = 2ω a , respectively measure the modulus |Z of the impedance at the two frequencies a |and|Z b |, use the following formula to obtain the required measured conductivity value g,

[0042] g = K / ( | Z a | · 1 + r 2 - 1 4 - r 2 )

[0043]In the formula, K is the conductivity cell constant, r=|Z a | / |Z b |.

...

Embodiment 2

[0045] Embodiment two: a kind of measuring method of the electrical conductivity of water, add frequency is ω respectively at the two poles of conductance cell a and ω b sinusoidal signal, where, ω b = 2ω a , respectively measure the modulus |Z of the impedance at the two frequencies a |and|Z b |, use the following formula to obtain the required measured conductivity value g,

[0046] g = K / ( | Z a | · 1 + r 2 - 1 4 - r 2 )

[0047] In the formula, K is the conductivity cell constant, r=|Z a | / |Z b |.

[00...

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Abstract

The invention discloses a method for measuring the conductivity of water, which is characterized in that: add a frequency of a and ω b sinusoidal signal, where, ω b = 2ω a , respectively measure the modulus |Z of the impedance at the two frequencies a |and|Z b |, use the following formula to obtain the measured conductivity value g, in the lower right formula, K is the conductivity cell constant, r=|Z a | / |Z b |. The invention has no theoretical error, completely eliminates the influence of the capacitive effect of the conductance AC measuring method, and can accurately measure the conductivity of water.

Description

technical field [0001] The invention relates to a method for obtaining the conductivity of the liquid by testing the impedance thereof, in particular to a method for measuring the conductivity of water. Background technique [0002] Conductivity is one of the important indicators of water quality control in power plants. For a long time, how to accurately measure the conductivity of water, especially the conductivity of high-purity water, has been a subject of great concern and in-depth research by water quality monitors and conductivity meter manufacturers. The conductivity of water in the conductivity cell can be calculated by the following formula: [0003] g=K / R (1) [0004] In the formula, K is the conductivity cell constant (also known as the cell constant). [0005] Thus, the measurement of conductivity is converted into the measurement of resistance. [0006] At present, the measurement methods of conductivity mainly include DC conducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/02G01R27/22G01N27/06
Inventor 陈小平陈红仙
Owner SUZHOU UNIV
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