TE Connectivity Air Bubble Detector (ABD) Sensor AD-101

Reliable detection of air bubbles in liquid is critical for many applications, such as medical dosing applications, food processing and smart farming, etc. Air Bubble Detector sensor (ABD) or Air-In-Line sensor is invented for detecting air bubbles in liquid flow. Due to their non-invasive working principle based on ultrasonic technology, Air Bubble Detector sensors have been widely used in many applications. Since the sensor uses ultrasonic technology, it’s not affected by the color and transparency of the tubes and liquids to be detected. The sensor consists of an ultrasonic transmitter and an ultrasonic receiver made of piezoelectric crystals. The transmitter is driven at the crystal’s resonance frequency. When air bubbles are presented in the tube between the ultrasonic transmitter and receiver, the ultrasonic transmission will be attenuated to generate a transition of the state of the output signal of the ultrasonic receiver. Please refer to the following figure for the concept of ultrasonic detection.

Ultrasonic Air Bubble Detector Sensor (Air-In-Line Detector) Working Principle

TE Connectivity’s Measurement Specialties has introduced its new AD-101 Air Bubble Detector sensor in a new compact form. Designed with new features and improved technologies, AD-101 ABD sensors are capable of detect the breaks in flow of any type of liquid.

TE Connectivity Measurement Specialty Air Bubble Detector Sensor AD-101

Specifications of TE Connectivity ABD Sensor AD-101:

  • Power Supply: 5-24VDC
  • Temperature range: 0-40C
  • Response time: 0.22 milliseconds
  • Output: 3.3V TTL, low when liquid present; high when air present
  • Self-diagnostics: 3.3V TTL, low when Fault; high when Pass

 Electrical Connections:

TE ABD AD-101 Electrical Connection

Applications of TE ABD AD-101:

  • Infusion pump;
  • Apheresis/Auto-transfusion;
  • Biotech/DNA analysis;
  • Blood Processing;
  • Immunoassay;
  • Chemical analysis;
  • Hemodialysis;
  • In-Vivo detection of gas;
  • Medical dosing applications;
  • Smart Farming;
  • Food Processing;

TE AD-101 Air Bubble Detector sensor offers the following benefits:

  • Detects bubble size as small as 70% of the tubing inner diameter;
  • The sensor can be customized to fit tube or pipe;
  • Non-invasive design eliminates sterility and fluid compatibility concerns;
  • High noise immunity to EMI/RFI;
  • Acoustic coupling agent not required;
  • Built-in integrated electronics;
  • Integrated power-on and continuously self-diagnostic tests to confirm functionality;


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