Sonic Flow Meters

Ultrasonic flow meters exploit the ability of materials to propagate sound in fluids, in particular the speed of sound propagation is a characteristic that depends on the density, pressure and temperature.

Ultrasonic flow meters work with the following principle: an electrical pulse is applied to an electroacoustic transducer which transforms it into a corresponding pulse of sonic energy with a frequency between 0.5 and 5 MHz.
The impulse propagates in the fluid under examination, with a speed dependent on the speed of the fluid itself, up to the receiver where it is transformed into an electrical signal.

The Ultrasonic flow meter can also be used for dirty or abrasive fluids and for large diameter pipes, however its precision is influenced by the flow rate.