Resistivity sampling circuit of water solution

Abstract

The invention discloses a resistivity sampling circuit of a water solution. The demanding on water quality of people is increasingly improved and the conductivity of water is an important index for evaluating the water quality. The resistivity sampling circuit comprises a voltage stabilization module, a voltage reverse module, a single chip microcomputer, a square wave generation module, a voltage comparing module, a square wave gear-shifting output module, a voltage following module, a conducting electrode, a signal amplification module and an analogue quantity output module. A square wave signal generated by the square wave generation module enters the conducting electrode after being processed; the square wave signal is attenuated into a new square wave signal after passing through the conducting electrode. The analogue quantity output module is used for converting the new square wave signal into a voltage signal and then conveying the voltage signal to the single chip microcomputer. The resistivity sampling circuit disclosed by the invention has a strong anti-interference capability and can be automatically switched to proper sampling square wave for carrying out conductivity detection, so that the resistivity sampling circuit has relatively high stability and detection precision.

Description

technical field [0001] The invention belongs to the technical field of water quality detection, and in particular relates to a resistivity sampling circuit of an aqueous solution. Background technique [0002] With the continuous progress of social development, people's requirements for water quality are increasing day by day, whether in industry or life. The conductivity of water is an important indicator for evaluating water quality, and the resistivity of aqueous solution is an important basis for calculating the conductivity of aqueous solution. ; But because the resistivity of the aqueous solution will be affected by many aspects, the detection value of the aqueous resistivity detection device currently used by people is often unstable and has a large error. Contents of the invention [0003] The object of the present invention is to provide a circuit for precise detection of resistivity of aqueous solution through stable square wave signal. [0004] The invention in...

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Problems solved by technology

[0002] With the continuous progress of social development, people's requirements for water quality are increasing day by day, whether in industry or life. The conductivity of water is an important indicator for evaluating water quality, and the resistivity of aqueous solution is an important basis for calculating the conductivity of aqueous solution. ; but because the resistivity of the aqueous solution will be affected by many aspects, the detection value of the aqueous resistivity detection device currently used by people is often unstable and has a large error

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