Liquid Ultrasonic Level Sensor UL-LIQ

The UL-LIQ ultrasonic level sensor is the ideal solution for liquid level applications.

  • Measuring range up to 100 ft (30.5 m)
  • Non-contact continuous level measurement
  • Self-cleaning, maintenance free operation
  • Plug-and-play installation with simple calibration
  • Optional remote monitoring and support

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Continuous Level Measurement for Liquid Applications

The UL-LIQ ultrasonic sensor from ABM is the ideal solution for liquid level applications. The non-contact ultrasonic sensor provides continuous level measurement up to 100 ft (30.5 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 (cellular modem), 2-wire loop-powered (HART) or 3-wire / 4-wire (RS232 or RS485) power and communication options, remote monitoring, and multiple mounting options.



  • Process tank level and control
  • Inventory level in storage tanks
  • Flood monitoring
  • Wastewater level in tanks

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 (30.5 m)
Technology: Ultrasonic
Frequency: Application dependent (25, 45, 52, 70, 80, 81 or 148 kHz)
Calibration: Simple push-button or programmable via communication port
Output: 4-20 mA out standard
Power: 12-30 VDC (2-wire loop-powered), 12-30 VDC (3-wire), 115 VAC (4-wire), 230 VAC (4-wire), 6-30 VDC (internal battery pack, cellular only) or 6-30 VDC (3-wire, cellular only) operation options
Communication: HART, RS232 or RS485 optional
Remote Communication: Optional with built-in cellular modem or Cellular Gateway
Ambient Temperature: -40 to 60°C (-40 to 140°F)
Enclosure: PVC standard. Aluminum or SS316L optional
Protection Rating: IP68 (NEMA 6)
Transducer: PVC standard. High Temperature Teflon or Sanitary SS316L options
Process Connection: 1″ – 6″ NPT
Process Temperature: -40 to 60°C (-40 to 140°F)
Process Pressure: ≤ 2 Bar (29 psi)

Data Sheet: Liquid Ultrasonic Level Sensor 2-wire loop-powered (HART)

Data Sheet: Liquid Ultrasonic Level Sensor 3 / 4-wire

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