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TrueFlow Technology - How it works

The TrueFlow sensor

Ultrasonic pulse transit-time measurement

What is transit-time measurement?

A simple and proven method to measure how long it takes for a signal to travel from one point to another.

The contactless flow sensor

Ultrasonic flow measurement is commonly used for liquid flow. ndd Medical Technologies was the first organization to leverage ultrasound flow measurement for the precise and accurate measurement of
respiratory diagnostics.

How it works - Flow measurement operating principle

1.

Two ultrasonic transducers are located diagonally across a gas flow path.

2.

As soon as air passes through, a pulse of ultrasound is emitted by one transducer, travels diagonally with the gas flow and is received by the opposite transducer.

3.

In the meantime, a second pulse of ultrasound is emitted by the opposite transducer which travels diagonally against the gas flow and is received by the opposite transducer.