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The ultrasonic flow measuring principle

For versatile and economical measurement of gases and liquids

Video Multiple industries 03.12.2024

Using ultrasonic waves, the flow volume of a wide variety of gases and liquids can be measured reliably – independent of electrical conductivity, pressure, temperature or viscosity.

Swimming against the flow requires more power and more time than swimming with the flow. This simple fact is the basis for ultrasonic flow measurement according to the “differential transit time” method: This method uses two sensors, set opposite each other in the measuring tube.

Each sensor can alternately transmit and receive ultrasonic signals while simultaneously measuring the signal transit time. As soon as the fluid in the tube starts to flow, the signals are accelerated in the direction of flow but delayed in the opposite direction. The differential transit time, measured by the two sensors, is directly proportional to the flow rate.

Watch the video to learn how the ultrasonic flow measuring principle works and read more about it here!

Advantages of ultrasonic flowmeters at a glance

  • Universal measuring principle for liquids and gases
  • Multivariable – simultaneous measuring of mass flow, density, temperature and viscosity
  • High measuring accuracy: typically: ±0.1% o.r., optionally: ±0.05% o.r. (PremiumCal)
  • Measuring principle independent of the physical fluid properties and the flow profile
  • No inlet/outlet runs necessary

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