A resistivity sampling circuit for aqueous solution
A sampling circuit and resistivity technology, applied in the direction of fluid resistance measurement, material resistance, etc., can solve the problems of unstable detection value and large error, and achieve the effect of wide application range, accurate detection and strong anti-interference ability.
Active Publication Date: 2019-06-11
杭州美仪自动化有限公司
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[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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[0030] The present invention will be further described below in conjunction with the accompanying drawings.
[0031] like figure 1As shown, a resistivity sampling circuit of an aqueous solution includes a voltage regulator module 101, a voltage inversion module 102, a single-chip microcomputer 103, a square wave generation module 104, a voltage comparison module 105, a square wave output module 106, and a voltage follower module 107. Conductivity electrode 108 , signal amplification module 109 and analog output module 110 . The voltage stabilizing module 101 regulates the voltage of 3.3V input from the outside to 2.5V through a voltage stabilizing chip, and provides the voltage to the single-chip microcomputer 103 , the square wave generating module 104 and the voltage inversion module 102 . The voltage inversion module 102 converts the 2.5V voltage provided by the voltage regulator module 101 into -2.5V and supplies it to the square wave generation module 104; the square wav...
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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, in particular to a resistivity sampling circuit of an aqueous solution. Background technique [0002] With the continuous progress of social development, whether in industry or life, people's requirements for water quality are increasing. The conductivity of water is an important indicator for evaluating water quality, and the resistivity of aqueous solutions is an important basis for calculating the conductivity of aqueous solutions. However, since the resistivity of the aqueous solution will be affected by many aspects, the detection value of the aqueous solution resistivity detection device currently used by people is often unstable and the error is large. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a circuit for accurately detecting the resistivity of an aqueous solution through a stable square wave signal. [0004] The invention inc...
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IPC IPC(8): G01N27/06G01R27/22
CPCG01N27/06G01R27/22
Inventor 丁程周凯邓泽微范光兴林以成荣磊
Owner 杭州美仪自动化有限公司