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Turbine flow meters are very similar to paddlewheel flow meters except the turbine flow is significantly more accurate. From ill. 1, notice that the turbine wheel is mounted so that it's directly in the flow. Each of the vanes of the turbine wheel has a magnet mounted in it so that when the vane spins under the magnetic pickup, an electric pulse is generated. When fluid starts to flow, the wheel will begin to rotate. When the flow increases, the wheel will rotate more quickly and the number of electric pulses will increase. The electric pulses can be averaged over time to provide a flow rate, or they may be totalized to determine the total flow.
ill. 1: A turbine flow meter. The turbine flow meter has a magnet mounted
in each of the vanes. When fluid flows past the turbine, it will spin and electric pulses are produced.
Also see: Turbine and Paddle Wheel Flow Meters and Flow Switches: Types and How To Select
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