SONOCHECK ABD05 | Bubble Detector

For the Reliable Detection of Bubbles in Medical Applications Requiring Fail-Safe Operation

Air bubble detection with the ultrasonic sensor SONOCHECK ABD05Ultrasonic air bubble sensor SONOCHECK ABD05Sensor for ultrasonic air bubble detection SONOCHECK ABD05
Air bubble detection with the ultrasonic sensor SONOCHECK ABD05Ultrasonic air bubble sensor SONOCHECK ABD05Sensor for ultrasonic air bubble detection SONOCHECK ABD05


  • TÜV-approved "Fail Safe" safety concept
  • Non-invasive measurement
  • No coupling medium required
  • Built-in electronics, no external electronic board required
  • Application-specific microbubble detection
  • No wear and tear
  • Optional software for parameterization and testing

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The SONOCKECK ABD05 - the highly reliable bubble sensor for medical devices

The non-invasive SONOCHECK ABD05 bubble sensor has been specifically developed for very high safety requirements in medical technology products. The smart sensor is applied to detect air and gas bubbles or foam in flexible plastic tubes filled with liquids such as blood, blood plasma, water or saline solution or is used for wet/dry alarm notifications.

The SONOCHECK ABD05 is designed as a component for fixed installation in medical devices such as for blood treatment, injectors or dialysis machines. Thus, the sensor is mechanically and electronically incorporated into the control unit of the MDEV.  

In most medical applications, the sensor is intended to prevent air infusions which could lead to an endangerment of patients.  

The sensor for quick and uncomplicated tubing changes

  • Compact design for applications with high hygienic requirements
  • Plug & Measure – tubes are simply inserted into the sensor with dry coupling
  • Automated adaption onto dynamically changing acoustic conditions

Outstanding measuring performance

Bubbles in the liquid stream result in a reduction of the signal as the ultrasound is significantly attenuated by air. If there is a bubble in the measuring path, the proportion of ultrasound that reaches the receiver is lowering considerably. The integrated electronics of the sensor evaluates the amplitude of the received signal and sets the output accordingly. The sensor guarantees detection of bubbles as low as 1/3 of the tube ID.

Advanced safety architecture

The SONOCHECK ABD05 bubble sensor features a TÜV approved safety concept to ensure a high level of patient security:  

  • Fail-safe architecture, incl. cyclical self-test procedures during operation, ʻInitial Testʼ after re-start or power-on and external watchdog
  • Secured data transmission via serial interface or PWM
  • Periodical ʻBubble Testʼ
  • Self-adjustments to surrounding conditions for constant sensitivity
  • Application-specific microbubble detection

In addition to the standard sensors, SONOTEC also manufactures customer-specific solutions.

Customer Reviews

Jeff Poland, President and CEO at Century HLM, on our air bubble sensors:

“We started with SONOTEC's ABD05 series sensor. After our research and interview process SONOTEC had the only sensor capable of meeting 60601 3rd edition specifications for a fail-safe free hanging non-intrusive arterial line air detector sensor.” [Read more]

Jochen Hübner, R&D and Quality Management Representative at Herrmann Apparatebau GmbH, on our Air Bubble Sensors:

“When searching for a suitable sensor our engineers came across SONOTEC. We chose the air bubble detector ABD06 of the SONOCHECK-series – in a customized version. The small size and the approved safety functions were the main reasons that spoke for the sensor.” [Read more]

Technical Data

Measurement principle


Bubble sensitivity

Bubbles larger than 1/3 of internal tube diameter are detected

Response time

Minimum: 0,5 ms
Typical: 1ms

Power supply

+5 ± 0,2 VDC
≤ 60 mA

Operating temperature

5 to 60 °C




Safety requirements: IEC 60601-1:2005 (3rd edition)
EMC: IEC 60601-1-2:2007 (3rd edition)
Acustic output (ultrasound): IEC 61157:2007
"Failsafe” version available as an option for use in medical products, in compliance with EN 60601



  • Dialysis and transfusions
  • Heart-lung machines
  • Blood separators
  • Pumps for medical technology (infusion, heart, feeding, contrast medium)
  • Diagnostic systems


Melissa Öser

Do you have any questions?

Melissa Öser

+49 (0)345 / 133 17-840
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