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They are based on a rotary rotor with blades. The rotor is driven by the fluid flow, the speed being proportional to the fluid flow rate. The speed is usually measured by a non-contact inductive sensor, where voltage pulses are the output, that are further processed and evaluated.
Advantages: low purchase cost, wide range of flow rates possible to be measured, reproducibility of measurements and short-term accuracy
Disadvantages: higher pressure losses, necessary disassembly when flushing the system