Capacitor liquid level sensor allowing site calibration

Abstract

A capacitor liquid level sensor allowing site calibration comprises a power module of 5V, a power module of 3.3V, an MCU micro-processing module, an analog signal output module, a calibration trigger module and a capacitor acquisition regulation module. The power module of 3.3V, the analog signal output module, the calibration touch module and the capacitor acquisition regulation module are connected with the MCU micro-processing module. The power module of 5V is connected with the power module of 3.3V, the analog signal output module, the calibration touch module and the capacitor acquisition regulation module. The capacitor liquid level sensor allows calibration on site, avoids the returning to the manufacturer for calibration, provides convenience to users, improves the installing and commissioning efficiency, and reduces the calibration cost.

Description

technical field [0001] The invention relates to a capacitive liquid level sensor which can be calibrated on site. Background technique [0002] The capacitive liquid level sensor outputs the corresponding analog value by collecting the sensing change between the two poles of the capacitor. The initial capacitance value of a capacitive liquid level sensor (when there is no liquid) is only related to the length of the sensor itself, the longer the length, the greater the initial capacitance value. When the sensor senses the liquid, as the liquid rises, its capacitance value also rises and changes linearly. When the liquid rises to the highest point, its capacitance value is also the largest. The actual capacitance value at full scale is related to the length of the sensor. The longer the length, the larger the full-scale capacitance value. It is also related to the dielectric constant of the liquid to be detected. The dielectric constant of the liquid to be detected is differ...

AI Technical Summary

Problems solved by technology

[0003] At present, the popular liquid level sensors on the market have been calibrated in the factory and cannot be re-calibrated on site; When the actual installation situation changes the length of the sensor, it will affect the initial capacitance value and the full-scale capacitance value, so that the zero output and full-scale output will change, which will affect the output accuracy. It must be returned to the manufacturer for recalibration, which will cause inconvenience to the user.

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