Detection circuit and detection method of total dissolved solids (TDS)

Abstract

The invention discloses a detection circuit and a detection method of total dissolved solids (TDS). The detection circuit comprises a water quality probe, a TDS detection unit with three branches and a processing unit, wherein a first end of a first branch is connected with a first end of the water quality probe; a first end of the second branch is connected with a second end of the water quality probe; a first end of the third branch is connected with the first end and / or second end of the water quality probe; a first output end of the processing unit is connected with a second end of the first branch; a second output end of the processing unit is connected with a second end of the second branch; a first input end of the processing unit is connected with a second end of the third branch; the two output ends of the processing unit are used for alternately outputting pulse signals; the input end of the processing unit are used for acquiring the TDS signal detected by the TDS detection unit. According to the detection circuit, voltage is alternately applied to two ends of the water quality probe to drive the water quality probe to work, electrolytic reaction caused by the operation of continuously applying direct current voltage to the water quality probe is avoided, the detection precision of the TDS in the water is improved, the influence on the water quality during detection is avoided, and the service life of the water quality probe is prolonged.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a TDS detection circuit and a detection method. Background technique [0002] Total Dissolved Solids (TDS, Total Dissolved Solids) refers to the total amount of solids dissolved in water, the measurement unit is parts per millions or mg / L, milligram / Liter, the physical meaning is how many milligrams of total dissolved solids are dissolved in 1 liter of water solid. In layman's terms, the TDS value represents the impurity content of dissolved substances in water. The larger the TDS value, the greater the impurity content in the water and the poor water quality. On the contrary, the lower the impurity content, the better the water quality. [0003] At present, the most effective measure of water quality is the TDS value of water. Because the larger the TDS value, the better the conductivity of water, and the larger the conductivity value; the smaller the TDS value, the worse the con...

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a TDS detection circuit and detection method to solve the problems of electrolytic reaction affecting the service life of the water quality probe, the detection accuracy and the purity of water quality when TDS is detected

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