Ultrasonic Level Sensor

The ultrasonic level meter uses the time needed after transmitting ultrasonic wave through the level or level to calculate the distance. Because it does not contact the medium, installation and maintenance of convenient performance in today’s industrial field application more and more. It can be widely used to measure the height of all kinds of liquid and solid materials, especially in some high hygienic requirements of the site has irreplaceable advantages.

Accurately measuring the volume of liquid at any point in a vessel is critical to many commercial and industrial processes. Reducing process variability reduces waste, improves quality and reduces costs, and can significantly improve OEM profitability.

Apure offers a variety of continuous level sensors to meet the needs of a wide range of applications. One such technology is ultrasonic. Ultrasonic technology should be considered in vented or non-pressurized applications.

  • For non-contact continuous level measurement
  • When moving parts may stick
  • Can be used in conjunction with Apure panel meters to read 4-20mA output in a convenient manner
  • When the liquid being measured is vigorously stirred
  • When the liquid to be measured is thick, viscous, film-forming or semi-solid
  • When measuring solids
  • When the tank is in a remote area

Ultrasonic sensors are used for continuous measurement of semi-solids, corrosive and viscous media, slurries and even some solids. They can be used indoors or outdoors, are low maintenance, and are cost effective in difficult applications.

Working principle of ultrasonic liquid level sensor

Ultrasonic sensors determine the material level based on the basic principle of acoustic (mechanical) energy.

The transducer emits high frequency pulses above human hearing (20-148 KHz). The ultrasonic transducer produces high voltage sound waves in transmit mode (similar to a loudspeaker) that propagate to the target and then reflect back from the product surface (echo). The transducer then switches to receiver mode (similar to a microphone) to listen to the reflected wave (echo). The reflected wave is then converted to an electrical signal, which is converted to give the distance to a specific target.

The varying distance to the target is converted to a linear 4mA to 20mA current output to provide continuous level measurement. Ultrasonic sensors can be easily programmed in the field with push-button programming or via PC to suit different application heights within their range.


  • Non-contact measurement for difficult liquids
  • Sensing range from 0.33 to 32 feet
  • Bench or field calibration via push button on sensor or communication with PC
  • 1″ or 2″ connectors for commercial and industrial applications
  • Temperature compensated signal for improved accuracy
  • Unaffected by color, shape or physical composition of target material


  • Food & Beverage
  • Water and Wastewater
  • Fuel, chemical and oil measurement
  • Slurries and solids
  • Open channel flow measurement

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