Measuring method of electroconductirity of water

Abstract

The present invention disclosed a method for measuring electric conductivity of water. It is characterized by that said method includes the following steps: adopting a conductance tank with two electrodes; respectively applying sine signals whose frequencies are omega a and omega b, in which omega b=2 omega a; respectively measuring modulus of Za and Zb of impedance under the condition of two frequencies; and utilizing a formula to determine its conductivity value g. Said invention also provides said formula.

Description

technical field The invention relates to a method for obtaining the conductivity of a liquid by testing its impedance, in particular to a method for measuring the conductivity of water. Background technique 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: g=K / R (1) In the formula, K is the conductivity cell constant (also known as the cell constant). Thus, the measurement of conductivity is converted into the measurement of resistance. At present, the measurement methods of conductivity mainly include DC conductivity measurement method and AC conductivity measurem...

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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, and the conductivity is calculated indirectly through the measurement of active power. This method needs to be calculated with time integration, which increases the processing difficulty

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