Liquid level sensor

Abstract

The invention discloses a liquid level sensor which comprises a sensing disc, an anti-interference resistor, a central processing unit, a triggering capacitor and a standard capacitor. One end of the standard capacitor is grounded, and the other end of the standard capacitor is connected with the central processing unit. One end of the triggering capacitor is grounded, and the other end of the triggering capacitor is connected with the central processing unit. The sensing disc is connected with the anti-interference resistor, and the other end of the anti-interference resistor is connected with the branch, connected with the central processing unit, of the triggering capacitor. The liquid level sensor is high in anti-interference capability, wide in using range, more convenient to install and operate, high in sensing sensitivity, higher in precision, reliability and safety, lower in production and manufacturing cost, small in size, and higher in performance-price ratio.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a liquid level sensor. Background technique [0002] Existing sensors, especially in the field of liquid level sensors, mainly include floating magnetic type, ultrasonic type, electrode type, and photoelectric type; however, the above-mentioned sensors in the prior art have obvious deficiencies and defects, and the floating magnetic type sensor is anti-interference Low capacity, due to mechanical movement, motion jamming often occurs, and product reliability is low; due to high equipment manufacturing precision requirements and large product structure, ultrasonic sensors have relatively high cost of use and low cost performance; electrode-type sensors are due to the use of It is a probe, which cannot be used in a pure water environment. At the same time, because most of the probes use heavy metals, it will cause certain damage to human health; due to the complex structure required by the p...

AI Technical Summary

Problems solved by technology

[0002] Existing sensors, especially in the field of liquid level sensors, mainly include floating magnetic type, ultrasonic type, electrode type, and photoelectric type; however, the above-mentioned sensors in the prior art have obvious deficiencies and defects, and the floating magnetic type sensor is anti-interference Low capacity, due to mechanical movement, motion jamming often occurs, and product reliability is low; due to high equipment manufacturing precision requirements and large product structure, ultrasonic sensors have relatively high cost of use and low cost performance; electrode-type sensors are due to the use of It is a probe, which cannot be used in a pure water environment. At the same time, because most of the probes use heavy metals, it will cause certain damage to human health; due to the complex structure required for photoelectric sensors, the production cost is relatively high, and installation and use are not convenient.

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