Liquid level detection system

Abstract

The invention relates to a liquid level detection system, which comprises a first voltage division circuit, a second voltage division circuit and a calculation circuit. A first reference metal part, afirst metal part, a second reference metal part, and a second metal part in contact with the liquid level are fixedly arranged in a liquid container. The second reference metal part is fixedly arranged on the bottom wall of the liquid container and is opposite to the second metal part. The face-to-face area between the first reference metal part and the first metal part is equal to the face-to-face area between the second reference metal part and the second metal part. A reference resistor is formed between the first reference metal part and the first metal part, and there is a predetermineddistance between the first reference metal part and the first metal part. The first voltage division circuit outputs a first partial voltage of the reference resistor. A liquid level resistor is formed between the second reference metal part and the second metal part, and the second voltage division circuit outputs a second partial voltage of the liquid level resistor. The calculation circuit calculates the liquid level depth according to the first partial voltage, the second partial voltage and the predetermined distance. Continuous liquid level detection with low cost and high precision is realized by a simple circuit, and the detection reliability is high.

Description

technical field [0001] The invention belongs to the technical field of liquid level detection, and in particular relates to a liquid level detection system. Background technique [0002] The detection of liquid level or liquid level is often used in civil and commercial occasions. The main method for liquid level detection in the market is to use the conductive characteristics of water to set multiple liquid level probes on the liquid level path, and through the detection probes The conduction and disconnection of the liquid level can realize the segmental detection of the liquid level, or set multiple liquid level detection metal sheets and a reference metal sheet on the liquid level path, and use the conductivity of water to detect the liquid level detection metal sheet and the reference metal sheet Between the equivalent capacitance, determine the current liquid level according to the equivalent capacitance. Neither of the above two methods can achieve continuous detecti...

AI Technical Summary

Problems solved by technology

Neither of the above two methods can achieve continuous detection of the liquid level, and it is affected by the high temperature and high humidity environment or the resistivity of the water is affected by various factors that cannot be detected or controlled in real time, such as water temperature, electrolyte, pH, etc., and false alarms will occur possibility of

[0003] In the existing market, ultrasonic, infrared sensor, pressure sensor and other methods are often used to realize the continuous detection of liquid level. These detection methods have the disadvantages of complicated circuit or structure and high cost.

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