Ultrasonic liquid level meter working principle

Ultrasonic level gauges work based on ultrasonic technology and time-of-flight measurement principles. Here’s an overview of how it works:

Ultrasonic Pulse Generation: A liquid level gauge emits ultrasonic pulses from a transducer or sensor mounted on the liquid container or on top of the container. The transducer converts electrical energy into ultrasound waves, which travel downward through the air or gas above the liquid.

Liquid surface reflection: When ultrasonic pulses reach the liquid surface, they are partially reflected back to the transducer due to the difference in acoustic impedance between air and liquid. The time it takes for a reflected pulse to return to the sensor is directly related to the distance of the sensor from the liquid surface.

Time of Flight Measurement: A level meter measures the time it takes for an ultrasonic pulse to travel from the sensor to the liquid surface and back. By using the known speed of sound in air (or other media) and the measured time of flight, the liquid level gauge calculates the distance to the surface of the liquid.

Level Calculation: Once the distance to the liquid surface is determined, the level gauge uses this information to calculate the level of liquid in the container or vessel. By knowing the geometry of the container, a level gauge can accurately determine the level based on the measured distance.

Output and display: Calculated level information is typically output as an analog signal, digital communication protocol (such as 4-20 mA or Modbus), or displayed on a local interface, allowing the operator to monitor and control the level in the vessel.

Overall, ultrasonic level gauges provide non-contact, reliable, and accurate liquid level measurement in a variety of industrial and commercial applications. They are suitable for use in tanks, silos, wells and other liquid storage and processing systems.

Post time: Dec-12-2023

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