Fast Response Ultrasonic Level Sensor UL-FR

The UL-FR ultrasonic level sensor is the ideal solution for liquid or solid level applications that require fast response.

  • Fast response, 10-30 echoes per second
  • Measuring range up to 100 ft (30 m)
  • Non-contact continuous level measurement
  • Self-cleaning, maintenance free operation
  • Plug-and-play installation with simple calibration
  • Remote monitoring and virtual support optional

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Continuous Level Measurement for Fast Response Applications

The UL-FR ultrasonic sensor from ABM is the ideal solution for liquid and solid level applications that require fast response. The non-contact ultrasonic sensor provides continuous level measurement up to 100 ft (30 m) with 4-20 mA output standard and simple push-button calibration. The sensor can be factory configured for a variety of applications with internal battery, 2-wire (HART) or 3-wire / 4-wire (RS232 or RS485) power and communication options, remote monitoring, and multiple mounting options.


  • Food & Beverage
  • Water & Wastewater
  • Chemical
  • Petrochemical


  • Fast moving object detection
  • Material mass / volume of conveyor belts
  • Solid material profile / shape on conveyor belts

High Performance, Maintenance Free Ultrasonic Sensor.

  • Self-adjusting sensor, automatically eliminates false echoes without user involvement
  • Very uniform polar pattern, negligible side lobes
  • Very uniform near field
  • Very wide frequency bandwidth that produces uniform echoes, short ringing and wide temperature operation
  • No influence from mounting, walls or internal obstructions on sensors performance
  • No influence from temperature, pressure or humidity on measurement
  • Automatically removes condensation and build-up from transducer face
  • Non-contact and self-cleaning nature provides maintenance free operation

Technology Advantage

ABM’s self-adjusting ultrasonic sensors continually monitor conditions in the environment and automatically adjust the transmitted energy, transmitted pulse amplitude and it’s duration, and receiver sensitivity to match to the current tank conditions. This technique allows the receiver to detect only one echo from the measured media while all false echoes are pushed under the noise level and eliminated. The self-adjusting technique also gives the same amplitude of wanted echoes regardless of distance to the target. With one echo only, signal processing is very simple and the certainty of the measured echo being the target is 100%. This makes the ABM sensors very accurate and reliable. In addition, it enables very fast response (up to 20 echoes per second) for fast moving applications such as conveyor belts.

The sensors have very narrow and uniform polar patterns. ABM’s ultrasonic technology has a very wide frequency bandwidth that produces uniform echoes, short ringing, and wide temperature operation.

Operation is plug-and-play with ABM sensors. The self-adjusting nature means there is no need for mapping or profiling the environment or downloading several parameters. These signal process operations commonly used by other brands reduce the certainty in the measured materials level. ABM sensors are smart and automatically adapt without user involvement.

Measuring Range: Up to 100 ft (30 m)
Technology: Ultrasonic
Frequency: Application dependent (25, 45, 52, 70, 80, 81 or 148 KHz)
Calibration: Simple push-button calibration for configuration
Output: 4-20 mA out standard.
Power: 6-30VDC (2-wire), Internal Battery pack, 12-28VDC Loop Powered (HART), 12-30VDC (3-wire) , 6-30VDC (3-wire, cellular only), 115VAC (4-wire) or 230VAC (4-wire) operation options
Communication: HART, RS232 and RS485 optional
Remote Communication: Remote monitoring and 24/7 virtual support with optional built-in cellular modem or Cellular Gateway
Ambient Temperature: – 40 to 140°F (- 40 to 60°C)
Enclosure: PVC, Aluminum or 316L stainless steel options
Protection Rating: IP68 (NEMA 6)
Transducer: PVC, Teflon or 316L stainless steel options
Process Connection: 1″ – 6″ NPT mounting
Process Temperature: – 40 to 140°F (- 40 to 60°C)
Process Pressure: ≤ 2 Bar (29 psi)

Fast Response Ultrasonic Level Sensor 2-wire HART Datasheet

Fast Response Ultrasonic Level Sensor 3 / 4-wire Datasheet

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