The ultrasonic flowmeter D-FL 200 works on the acoustic pulse differential method .

 The used ultrasonic transducers can work either in transmit-mode or in receive-mode.
 The measuring heads with the sensors are mounted on the duct in a way that a vectorial component of
 the gas-flow coincides with the direction of the sound.
 The transducers continuously transmit and receive impulses.
 The gas flow affects on the transit-time.The time upstream is reduced and the time Downstream is prolonged.
 The mathematical description of these two transit-times includes two unknown variables: “ gas velocity”
 and “ speed of the ultrasound” .
 These two unknown variables can be resolved out of the system of equations.The resulting velocity can be multiplied by the cross-section of the duct to obtain the volume flow.Temperature and pressure are only needed for the calculation of the standard flow .
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