Principle of ultrasonic liquid level meter

Ultrasonic liquid level meter in the measurement of ultrasonic pulse made by sensor (transducer), sound waves by the liquid surface reflection by the same sensor after receiving or ultrasonic receiver, by piezoelectric crystal or magnetostrictive devices converted to electrical signals, and by sound waves between transmitting and receiving time to calculate the sensor to the measured distance on the surface of the liquid.

Due to the non-contact measurement, the measured medium is almost unlimited and can be widely used for the measurement of the height of various liquid and solid materials.

Ultrasonic liquid level meter consists of three parts: ultrasonic transducer, processing unit and output unit.

The working principle of

Working principle of the ultrasonic level meter is made by ultrasonic transducer (probe) high frequency pulse waves meet level (materials) on the surface to be tested is reflected back to the echo are converted to electrical signals received by transducer. Acoustic travel time and sound waves to object is directly proportional to the distance from the surface. And sound transmission distance S available formula for the relation of the sound velocity and acoustic transmission time T C said: S = C * T / 2.

Because the transmitted ultrasonic pulse has a certain width, the reflected wave overlaps with the transmitted wave in a small area close to the transducer, so that its distance cannot be recognized and measured.This area is called the measurement blind spot.The size of the blind area is related to the type of ultrasonic level meter.

The probe part emits ultrasonic wave, which is reflected by the liquid surface and received by the probe part. The distance between the probe and the liquid (object) surface is proportional to the time of ultrasonic wave:

Distance [m]= time × sound velocity /2[m]

The temperature compensation formula of sound velocity: ambient sound velocity =331.5+0.6× temperature

Product features

Automatic power adjustment, gain control, temperature compensation.

Advanced detection technology, rich software functions to adapt to a variety of complex environment.

The new wave form calculation technique is adopted to improve the measuring accuracy of the instrument.

With interference echo suppression function to ensure the authenticity of measurement data.

Various output forms: programmable relay output, high-precision 4-20ma current output, rs-485 digital communication output separated ultrasonic liquid level probe