Measuring air in liquid

This application note shows how the Pulsed Flow Sensor (PFS) behaves if air bubbles are trapped in the liquid, or if only air passes through the sensor. An ideal liquid flow sensor would only measure liquid and neglect air/gases completely. The following experiments show the behavior of the PFS in this context.


Used Material:

  • Pulsed Flow Sensor V3-B1
  • PFS controller with user Interface
  • Nordson EFD 55ml pressurized cartridge with piston
  • Syringe Pump

Sensor specifications:

  • Flowrate: 3 – 30 ml/min
  • Response time: 1 ms
  • Calibration media: water
  • Sensor principle: differential-pressure flow sensor

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