The working principle of the turbine flowmeter is very simple. Turbine flowmeters use the mechanical energy of the fluid to rotate an "impeller" (rotor) in the flow tube. The blades in the rotor are angled to convert fluid flow energy into rotational energy. The rotor shaft rotates on bearings. When the speed of the fluid increases, the rotor rotates proportionately faster.
Turbine type flowmeter prices are more affordable than other flowmeter types. It provides very good efficiency in clean, low viscosity fluids that flow at a medium speed and a constant rate. It is not reliable for steam because its bearing will wear out.