An intelligent digital capacitive liquid level sensor

Abstract

The invention discloses an intelligent digital capacitive liquid level sensor which comprises a tube body; a top seat is arranged on the top of the tube body in a matched way; a data acquisition and processing circuit board is arranged in the top seat; a pair of corresponding necks are arranged in the tube body; circuit board bodies are clamped in the necks; one or two copper foils which are independent from each other are coated on the circuit board bodies; insulating materials are coated on the surfaces of the copper foils and are isolated and insulated from the measured liquid; metal sheets which are in parallel with the circuit board bodies are also arranged in the tube body; the metal sheets and the circuit board bodies form a capacitance probe of the sensor; the output end of the capacitance probe is connected with part of the data acquisition and processing circuit board; the data acquisition and processing circuit is packaged in a cavity body of the top seat on the sensor by a sealant; and a vent hole is arranged at a joint between the tube body and the top seat. According to the intelligent digital capacitive liquid level sensor, a digital chip capacitance acquisition technology is adopted to measure the height of the measured liquid, so that the continuous and high-precision measurement and display of the height of fuel are realized.

Description

technical field [0001] The invention relates to a liquid level sensor, in particular to an intelligent digital capacitive liquid level sensor. Background technique [0002] The traditional first-generation liquid level sensor is the contact resistance pendulum type. The change of the liquid level drives the pendulum equipped with the float to move up and down, and the height of the liquid level is measured through the change of the resistance value of the contact resistance. Since the core component is The variable resistor performs mechanical movement reciprocatingly with the change of the liquid level, and is directly exposed to the measured liquid. After long-term use, the variable resistor part is easy to wear, the reading error is also large, and the service life is also limited; the second-generation liquid level sensor is also The height of the liquid is measured by the float floating up and down in the measured liquid. The difference is that the principle of non-cont...

AI Technical Summary

Problems solved by technology

At present, digital instruments have become a development trend. Traditional automotive fuel level sensors are increasingly unable to meet the requirements of automotive electronics development. The development and application of a new generation of intelligent liquid level sensors is more urgent.

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