The working principle of the three forms of common liquid level sensors

by:Kaidi Sensors     2022-01-15
Sensor technology is constantly improving and improving with the development of science and technology and the needs of modern industrial technology. There are also many types of liquid level sensors. Different types have different working principles, performances and different application ranges. The following will analyze the working principles of different liquid level sensors from different forms. The working principle of the ultrasonic liquid level sensor is that the high-frequency ultrasonic pulse sent by the transducer meets the surface of the measured medium and is reflected back, and part of the reflected echo is received by the same transducer and converted into an electrical signal. Ultrasonic pulses propagate at the speed of sound waves, and the time interval from emission to reception of the ultrasonic pulses is proportional to the distance from the transducer to the surface of the measured medium. The relationship between the distance value S and the speed of sound C and the transmission time T can be expressed by the following formula: Su003dCT/2 Because the transmitted ultrasonic pulse has a certain width, it makes the reflection in a small area closer to the transducer The wave overlaps with the transmitted wave and cannot be identified and the distance value cannot be measured. This area is called the measurement dead zone. The size of the blind zone is related to the model of the ultrasonic liquid level sensor. Ultrasonic liquid level sensors can be applied to various complex working conditions. The transducer has a built-in temperature sensor, which can realize temperature compensation of the measured value. Servo-type liquid level sensor is a relatively successful new type of liquid level sensor, which is mainly used in the high-precision measurement of light oil products. It forms a relatively strong competition with the radar level sensor. The basic principle is the same as the steel belt type liquid level sensor, but it has an accurate force sensor and a servo system to form a closed-loop adjustment system. By considering the gravity of the steel belt, the height of the float is accurately adjusted to balance the buoyancy and gravity to obtain an accurate current liquid level. To the height of the tank top to get the level value. The static pressure type liquid level sensor uses the proportional relationship between the pressure of the uniform liquid and the height to convert the liquid level height by measuring the pressure at the bottom of the liquid. Since the static pressure type liquid level sensor is greatly affected by the density and temperature of the medium, the accuracy is relatively poor. In order to eliminate these effects, the static pressure type liquid level sensor needs many other test instruments, and a complete set of static pressure The measurement system is expensive. Using the principle of static pressure measurement: When the liquid level transmitter is put into a certain depth in the measured liquid, the formula for the pressure on the sensor’s face is: Pu003dρgH+Po where P: the pressure on the face of the transmitter Pressure; ρ: density of the measured liquid; g: local acceleration due to gravity; Po: atmospheric pressure on the liquid surface; H: depth of the transmitter into the liquid. At the same time, the pressure of the liquid is introduced into the positive pressure cavity of the sensor through the gas-conducting stainless steel, and then the atmospheric pressure Po on the liquid surface is connected to the negative pressure cavity of the sensor to offset the Po on the back of the sensor, so that the pressure measured by the sensor is: ρg. H. Obviously, by measuring the pressure P, the liquid level depth can be obtained. The above is the working principle of the three forms of common liquid level sensors. You can make some references based on the above content, and hope to help you learn some basic knowledge about liquid level sensors. Through the above brief description, in order to reduce the error, the user can comprehensively consider and choose the instrument that suits him.
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