Novel magnetic Hall liquid level sensor

Abstract

The invention discloses a novel magnetic Hall liquid level sensor. The sensor comprises a shell body and a PCB which is arranged in the shell body and matched with the shell body, wherein a floater is arranged on the shell of the shell body, and a magnet is arranged in the floater; the sensor further comprises a control module, and the control module comprises an MCU, an A / D conversion module, a D / A conversion module, a temperature detection module used for temperature detection and a signal output interface module, wherein the A / D conversion module, the D / A conversion module, the temperature detection module and the signal output interface module are connected with the MCU separately; a plurality of Hall elements are arranged on the PCB in the lengthwise direction in sequence, an output pin of each Hall element is connected with a resistor R, and the resistors R are connected with each another in series in sequence. The sensor has the advantages of high resolution and high precision, and can completely meet the demands of a customer for the precision of the liquid level sensor; output liquid level signals vary linearly, and data processing is easy; the signal number can be cut according to different lengths, so that the efficiency of post data reduction is greatly improved.

Description

technical field [0001] The invention relates to the field of liquid level measurement, in particular to a novel magnetic Hall liquid level sensor. Background technique [0002] Most liquid level sensors in the prior art use reed switches as magnetic sensing elements, but the contacts and reeds of the reed switches are quite small and delicate, so they are difficult to withstand high voltage or high current. When the current is too large, the reed will lose its elasticity due to overheating. That is, the switch capacity is small, the contacts are prone to jitter and the contact resistance is large; and there are many troubleshooting procedures for reed switches, and special instruments (such as AT value testers, insulation withstand voltage testers, and internal resistance testers) are required for faulty reed switches. etc.) testing; and it is not suitable for product design with a small error range: the AT value range is large, and from the perspective of cost, it cannot b...

AI Technical Summary

Problems solved by technology

That is, the switch capacity is small, the contacts are prone to jitter and the contact resistance is large; and there are many troubleshooting procedures for reed switches, and special instruments (such as AT value testers, insulation withstand voltage testers, and internal resistance testers) are required for faulty reed switches. etc.) testing; and it is not suitable for product design with a small error range: the AT value range is large, and from the perspective of cost, it cannot be guaranteed that the AT values ​​​​of batch products are the same, and the matching magnets are also different.

Later, the Hall element was used instead of the reed switch as the magnetic induction element in the market, but this cannot be used universally, and needs to be customized according to the needs of customers. At the same time, the accuracy is poor, and the production cost is very high.

The magnetic-Hall liquid level sensor that can be mass-produced later can replace the needs of the existing conventional liquid level sensor. It has high versatility, but the resolution is not high and the mass production speed is not high.

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