Posted in | Piezoelectric Sensors

AT120 Airducer® Ultrasonic Air Transducer for Multiple Applications

The ultrasonic AT120 Airducer® Transducer from Airmar reliably delivers unparalleled sensing performance with level, flow, distance, proximity and object detection measurement applications. It operates at 125 kHz and has a sensing range from 15 cm to 7 m. The AT120 includes rugged sealed construction, and PVDF housing is available for more chemically aggressive environments. 


  • Automation control
  • Robotics
  • Proximity
  • Level measurement
  • Obstacle avoidance
AIRMAR AT120 Ultrasonic Transducer

Video Credit: AIRMAR Technology Corporation


  • The cylindrical design enables installation in different applications
  • Rugged sealed construction


  • 10 KΩ thermistor available for temperature compensation
  • Available in PVDF housing for use in chemically aggressive environments


  • Peak operating frequency: 125 kHz ± 4%
  • Minimum receive sensitivity: −169 dB re, 1 V/µPa at the best receive frequency
  • Minimum transmit sensitivity: 107 dB re, 1 µPa/V at 1 m at best transmit frequency
  • Minimum and maximum sensing range*: 15 cm to 7 m
  • Minimum parallel resistance: 420 Ω, ±30%
  • Operating temperature: −40 to 90 °C (−40 to 194 °F)
  • Weight: 20 g (0.7 oz)
  • Typical sensing range: 20 cm to 3 m (8″ to 10′)
  • Housing material: Glass-filled polyester
  • Beamwidth: 12° ± 2° at −3 dB
  • Free capacitance: 1000 pF ± 20% at 1 kHz
  • Maximum driving voltage: 800 Vpp at 2% duty cycle tone burst
  • Acoustic window: Glass reinforced epoxy

*Pulse-Echo Mode: The best-case situations are the minimum and maximum ranges. Depending on the driving circuitry and signal processing, the actual range may vary.

Acoustical Data

AT120 Airducer® Transducer

Image Credit: AIRMAR Technology Corporation

Dimensional Drawings

AT120 Airducer® Transducer

Image Credit: AIRMAR Technology Corporation

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