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Schematic diagram of turbine flow meterTurbine flow meter

When gas flows through a turbine flow meter it makes a vane turn; flow through the tube is proportional to the number of revolutions per unit of time. The latter is measured from the electrical impulses generated by interrupting light directed at a photocell at each turn of the vane.
An advantage of this system is that it is insensitive to turbulent flow, gas composition, and water vapor and gas temperature. A disadvantage of the system is its inertia, which needs to be minimized by using a very lightweight vane and applying a deflector.

Turbine flow meter Example of a turbine flow meter.

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