Working principle of liquid level sensor

Liquid level sensor is a common sensor, mainly used in petrochemical, pharmaceutical, electric power and other systems to measure the liquid level of various media. The liquid level sensor has an exquisite structure and flexible installation, which provides users with a convenient liquid level detection scheme. 1. Classification of liquid level sensors 1. The first type is contact type, including single-flange static pressure/double-flange differential pressure liquid level transmitter, float type liquid level transmitter, magnetic liquid level transmitter, Input type liquid level transmitter, electric internal float level transmitter, electric float level transmitter, capacitive liquid level transmitter, magnetostrictive liquid level transmitter, service liquid level transmitter The second type is non-contact type, which is divided into ultrasonic liquid level transmitter, radar liquid level transmitter, etc. 2. Liquid level sensor works Principle: 　　 Commonly used static pressure measurement principle: When the liquid level transmitter is put into a certain depth in the measured liquid, the formula for the pressure on the sensor's front surface is: Ρ u003d ρ ·g·H + Po　　 where: 　　P: change The pressure on the liquid surface of the transmitter ρ: the density of the liquid being measured g: the local acceleration of gravity Po: the atmospheric pressure on the liquid surface H: the depth at which the transmitter is put into the liquid. Pressure chamber, and then connect the atmospheric pressure Po on the liquid surface to the negative pressure chamber of the sensor to offset the Po on the back of the sensor, so that the pressure measured by the sensor is: ρ ·g·H. Obviously, when ρ and g are known , By measuring the pressure P, the liquid level depth can be obtained.

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