Application Examples 45_Flow Rate and Total Flow Measurement
Paddlewheel and turbine flow sensors are similar in operation as they rely on the energy in the flow stream to spin the rotor. The spinning rotor generates either a sinusoidal or square wave output.
Most paddlewheel and turbine flow sensors use rotors with magnets embedded in each blade. The magnets are used together with a coil to produce the sinusoidal output (Hall effect sensors), or trigger an electronic switch to produce a square wave output (NPN or PNP transister output sensors). The resultant frequency is directly proportional to the flow rate.
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