Volume counter (not a flow rate counter!) based on two oval rotors with special teeth which cause the fluid flow to rotate (Figure O 12).
The flow sensor with oval rotor assembly operates with great precision. It is used on test benches in hydraulics.
![4c26c892464e78ff8a1428d9a29ca5c403b1a0da 0001_ovalradzaehler.gif](/fileadmin/smc/files/4c26c892464e78ff8a1428d9a29ca5c403b1a0da.gif)
Figure O 12: Principle behind the flow sensor with oval rotor assembly