Doppler Flow Meter Principle - Animation EESIFLO


The EESIFLO clamp on Doppler meters rely a principal that requires moving reflectors in the liquid. The reflectors can be small or larger amounts of solids or bubbles but not necessarily moving at the same flow rate as the media. Ultrasonic waves are transmitted by the sensor through the pipe wall, into the media where it reflects back off the moving particles back up through the pipe wall where it is picked up by an ultrasonic receiver.

The single sensor head contains both transmitter and receiver so that the change in frequency/Doppler shift can be determined. The Doppler shift can be correlated to a flow velocity and if the internal pipe diameter is known, a volumetric flow rate is expressed in commonly used measurement units on a digital display. The unit can also send a 4-20mA signal output or set to trip a pump at a determined flow rate. Common applications for this device are raw sewage pumping, dirty liquids (slurries) dredging and mining water.