As its name indicates, the working principle is the measurement of flow from the rotational speed of a rotor or turbine. Its main drawback is having moving parts, but by having highly robust equipment this is not a problem as long as no solids circulate through the duct.
The turbine system offers acceptable pressures and accept harsh working conditions such as: Temperatures up to 100 ° C, pressures up to 250 bar and high viscosity fluids.
The rotor has a very competitive price and can measure really low flows.
The working ranges goes from few ml/min up to 2500 l/min.
The materials can be noble metals (mainly stainless steel) standard metals such as brass or engineering plastics (PVDF, Ryton, PEK …) that are compatible with most fluids.
The most common supplied series are the RT and LABO RT, RN3, RRI, VTH25, VISION 2008, FHKU, etc.