Posted in | Piezoelectric Sensors

ARK75-THD Airducer® Ultrasonic Air Transducer for Chemically Harsh Environments

The ultrasonic ARK75-THD Airducer® Transducer from Airmar brings proven dependability to level, flow and distance measurement applications. The ARK75-THD includes standard internal shielding and 8 mm M3 PCB standoffs.  It operates at 75 kHz and its sensing range is 20 cm to 10 m. The ARK75-THD's rugged one-piece Kynar PVDF housing makes it suitable for the most chemically aggressive environments. Its threaded design facilitates installation in various applications, and it can accommodate transceiver and signal processing electronics.


  • Level measurement
  • Flow monitoring
  • Food and beverage processing


  • Standard internal protection
  • Rugged one-piece PVDF housing that is U.S. FDA compliant
  • 8 mm M3 PCP standoffs
  • Threaded design makes it easy for installation in various applications


  • Complete assembly offered with standard cable lengths
  • 10 KΩ thermistors temperature compensation
  • Mounting caps offered in M32, BSP or NPT threads
  • Nut — 1.5" BSP thread
  • 12 mm extension sleeve


  • Peak operating frequency: 75 kHz ± 4%
  • Weight: 250 g (8.8 oz.)
  • Acoustic window: Kynar® 720
  • Housing material: Kynar® 720
  • Minimum and maximum sensing range*: 20 cm to 10 mm (10" to 33')
  • Minimum parallel resistance: 150 Ω, ±30%
  • Minimum receive sensitivity:  −165 dB re 1 V/µPa (at best receive frequency)
  • Minimum transmit sensitivity: 106 dB re, 1 µPa/V at 1 m (at best transmit frequency)
  • Beamwidth: 14° ± 2° at  −3 dB
  • Free capacitance: 1850 pF ± 20% at 1 kHz
  • Typical sensing range: 25 cm to 7 m (10" to 23')
  • Operating temperature: −40 °C to 90 °C (−40 °F to 194 °F)
  • Maximum driving voltage: 1000 Vpp at 2% duty cycle tone burst

*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

ARK75-THD Airducer® Transducer

Image Credit: AIRMAR Technology Corporation

Dimensional Drawings

ARK75-THD Airducer® Transducer

Image Credit: AIRMAR Technology Corporation

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