Acoustic Leak Testing


Gases or liquids emerging through  leaks produce  ultrasonic vibrations by turbulences. These vibrations can be located by suitable ultrasonic detectors. The oscillated vibrations are modified into low-frequency sound which is located within the acoustic range of human ears by signal converter or into electrical signals.

The detection of sound signals of gas or liquid leakages has many advantages compared with other leak testing methods, where the surface of the test specimen has to be accessible and visual testing is required.

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The  ultrasonic testing device SONAPHONE Pocket serves for quick and simple detection of small leaks.

  • Compact portable detector
  • Easy to use
  • Cost-efficient
  • Extensive accessories for a wide range of applications


  • Leak detection  with compressed air, gas and vacuum systems
  • Wear control on rotating machines
  • Providing evidence of partial electrical discharges  where there is insulation damage
  • Functional testing of steam traps and valves 
  • Tightness testing  of unpressurised systems
Technical Data  
Transmission frequency
40 kHz; bandwidth +/- 2 kHz
Detection of ultrasonic signals

  • Makes the ultrasonic signals audible 
  • Shows them on a digital display
  • Auto-power-off-function
LC-Display with illuminated background
For different ultrasonic probes;
   Stereo jack socket
Power supply
Operation time
Operation temperature
Storage temperature
Protection class
2 AA batteries or accumulators
Approx. 24 h
WHD 85 x 130 x 30 mm
Approx. 280 g
-10 °C ... +60 °C
-20 °C ... +60 °C
Device: IP54; Probe: IP20
SONAPHONE Pocket | Ultrasonic testing device

Scope of delivery

Ultrasonic testing device with

  • Probes
  • headphones
  • carrying strap
  • carrying case
  • instruction manual

auf die Merkliste  613.100.015    

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