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A spinner flowmeter is an impeller that is placed in the well to measure fluid velocity in the same manner that a turbine meter measures flow rate in a pipeline. Like a turbine meter, the force of the moving fluid causes the spinner to rotate. The rotational velocity of the spinner is assumed linearly proportional to fluid velocity, and electronic means are incorporated into the tool to monitor rotational velocity and sometimes direction. A significant difference between a spinner flowmeter and a turbine meter is that the spinner impeller does not span the entire cross section of flow, whereas the turbine meter impeller does, with a small clearance between the impeller and the pipe wall.

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