Posted in | Piezoelectric Sensors

ARK120-THD Airducer® Ultrasonic Air Transducer for Chemically Harsh Environments

The ultrasonic ARK120-THD Airducer® Transducer from Airmar reliably delivers non-contact level, flow, distance and proximity measurement.  The ARK120-THD operates at 125 kHz, has a sensing range from 15 cm to 5 m and it includes standard internal shielding and 8 mm M3 PCB standoffs. The ARK120-THD's rugged one-piece Kynar PVDF housing makes it suitable for chemically aggressive environments, and its threaded design facilitates installation in various applications.


  • Level measurement
  • Processing of food and beverages


  • Installation in various applications is enabled by threaded design
  • US FDA compliant rugged one-piece PVDF housing
  • M3 PCB standoffs of 8 mm
  • Standard internal shielding


  • Standard cable lengths offer complete assembly
  • Nut — 1.5" BSP thread
  • Extension sleeve of 12 mm
  • 10 KΩ thermistors offer temperature compensation


  • Peak operating frequency: 125 kHz ± 4%
  • Weight: 250 g (8.8 oz.)
  • Minimum transmit sensitivity: 102 dB re, 1 µPa/V at 1 m (at best transmit frequency)
  • Minimum receive sensitivity: −172 dB re 1 V/µPa (at best receive frequency)
  • Minimum and maximum sensing range*: from 15 cm to 5 m
  • Typical sensing range: from 20 cm to 3 m (8" to 10')
  • Minimum parallel resistance: 500 Ω, ±30%
  • Free capacitance: 1000 pF ± 20% at 1 kHz
  • Maximum driving voltage: 800 Vpp at 2% duty cycle tone burst
  • Housing material: Kynar® 720
  • Operating temperature:  −40 °C to 90 °C (−40 °F to 194 °F)
  • Acoustic window: Kynar® 720
  • Beamwidth: 12° ± 2° at −3 dB

*Pulse-Echo Mode. Maximum and minimum ranges are best-case scenarios. Depending on signal processing and drive circuitry, the actual range may vary.

Acoustical Data

ARK120-THD Airducer® Transducer

Image Credit: AIRMAR Technology Corporation

Dimensional Drawings

ARK120-THD Airducer® Transducer

Image Credit: AIRMAR Technology Corporation

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