The liquid level sensor is a kind of common sensor to measure the liquid level position, which converts the height of the bit into the form of electrical signal for output. In recent years, with the continuous development of electronic technology and automation, liquid level measurement and control technology has been greatly improved. The production of daily chemicals, food and beverage, medicine and other industries is inseparable from the monitoring of liquid level, and the importance of liquid level sensors is becoming increasingly prominent, and even directly affects the quality of products.
The type of liquid level sensor is 1. Float type liquid level sensor is composed of magnetic float, measuring catheter, signal unit, electronic unit, junction box and mounting parts. The general magnetic float has a specific gravity of less than 0.5 and can float above the liquid level and move up and down along the measuring tube. The tube is equipped with a measuring element, which can convert the measured liquid level signal into a resistance signal proportional to the change of the liquid level under the external magnetic action, and convert the electronic unit into 4 ~ 20ma or other e-commerce standard signal output. 2. Float type liquid level sensor The float type liquid level sensor changes the magnetic float ball into a float. The float type liquid level sensor is used to measure the liquid level, boundary or density by using a tiny metal film strain sensing technology. 3. Static pressure level sensor Static pressure level sensor is the use of explosion-proof flowmeter liquid static pressure measurement principle. Generally, the silicon pressure sensor is used to convert the measured pressure into an electrical signal, which is then amplified by the amplifier circuit and compensated by the compensation circuit, and finally output with 4~20ma or 0~10ma current.