Ultrasonic Liquid Level Sensors

SMD Fluid Controls offers a variety of ultrasonic liquid level sensors and transmitters for continuous, non-contact tank level measurement. Our industrial ultrasonic sensors operate using the most state of the art working principles and are available in a variety of materials and prices.

Browse our standard models below or get in touch to learn more about custom design and manufacturing services to meet your application’s specific requirements.

Plastic Ultrasonic Liquid Level Sensors

Our plastic ultrasonic liquid level sensors offer dependability at cost-effective prices. These plastic sensors are intended for general use, with potable water, or to withstand normally corrosive acids and other normally problematic liquids.

Stainless Steel Ultrasonic Gap Sensors

These durable 316 stainless steel level sensors are corrosion-resistant and ideal for unique liquid level sensing applications. The ultrasonic gap sensor provides exceptional point level sensing for a wide range of liquids. These are available with switched relay or digital outputs, for pressures from 250 PSI (standard) to 5,000 PSI in custom configurations.

Click the link below to see information on our FL50 ultrasonic level sensor, or feel free to contact us for more information.


More Information about Ultrasonic Liquid Level Sensors from SMD Fluid Controls

How Ultrasonic Level Sensing Works

Ultrasonic liquid level sensors operate by emitting pulses of ultrasonic sound (that is, sound outside of the audible range for human hearing). These soundwaves travel toward the liquid medium being measured before bouncing back and returning to the transducer which produced them.

The distance between the transducer and the surface of the liquid medium can then be calculated based on the time elapsed between emission and return and the speed of sound. This distance is subtracted from total tank or vessel depth, and thus liquid levels are accurately calculated.

Common Applications for Ultrasonic Liquid Level Sensors

Since ultrasonic sensors work without the need to touch the medium being measured, as is the case with optical or float switches, they are ideal for difficult or corrosive liquids such as acids, wastewater, and others.

Ultrasonic level sensors are also ideal for applications where continuous level measurement is required. While float switches and other sensors are adept at measuring when liquid levels are above or below a certain point, the nature of ultrasonic level measurement is such that levels can be sensed and displayed in real time.

In addition to liquid level sensing, common applications for ultrasonic sensors include the following:

  • Loop control
  • Robotic sensing
  • Thread or wire break detection
  • Vehicle detection for automotive assembly
  • Irregular parts detection
  • Presence detection
  • And more