Digital capacitance type liquid level measuring sensor

Abstract

The invention relates to the liquid level measuring field, in particular to a digital capacitance type liquid level measuring sensor comprising a capacitance probe, a data acquisition circuit, a data receiving circuit and a display, wherein the output of the capacitance probe is connected with the data acquisition circuit, the output of the data receiving circuit is connected with the display, and the data acquisition circuit is connected with the data receiving circuit via CAN and LIN network. The invention overcomes the shortages of incorrect reading and limited service life of the prior art and has the advantages of accurate reading and long service life, oil mass display can be integrated with other parameters, such as speed per hour and temperature display.

Description

technical field [0001] The invention relates to a digital capacitive liquid level measurement sensor used in chemical industry, petroleum, water level and other relevant liquid level measurement fields. Background technique [0002] Liquid level sensors include input liquid level sensors (rod type, cable type), flange type liquid level sensors (single flange, double flange), magnetic flap liquid level sensors and float liquid level sensors, etc. According to different environmental requirements, corresponding sensors can be selected. At present, most of the sensors used to measure the fuel volume of automobile fuel tanks are float type liquid level sensors. The measurement principle is to put a float into the liquid, the float will drive the resistance of the variable resistor to change according to the change of the liquid level, and then control the display according to the change of the current in the circuit to obtain the real-time liquid level value. Because the core c...

AI Technical Summary

Problems solved by technology

Because the core component of the float type liquid level sensor is a variable resistor, it performs mechanical movement with the change of the liquid level and is directly exposed to the fuel. Long-term use leads to a large reading error. The disadvantage of this type of sensor is that the reading is not accurate and the service life Short, the driver cannot accurately grasp the current accurate fuel volume

[0003] Now the car's oil quantity display is basically indicated by a pointer, and the scale is not detailed, which can only roughly reflect the current oil quantity. The vibration of the car body will also deflect the pointer during the driving process. The goal of the digital display is to use accurate digital readings Instead of pointer indication, the driver can easily know the current fuel volume, grasp the temperature in the fuel tank, and know when to refuel the car

Images