TURBINE FLOW METER
Turbine flowmeters use
the mechanical energy of the fluid to rotate a “pinwheel” (rotor) in the flow
stream. Blades on the rotor are angled to transform energy from the flow stream
into rotational energy. The rotor shaft spins on bearings. When the fluid moves
faster, the rotor spins proportionally faster.
Shaft rotation can be
sensed mechanically or by detecting the movement of the blades. Blade movement
is often detected magnetically, with each blade or embedded piece of metal
generating a pulse. Turbine flowmeter sensors are typically located external to
the flowing stream to avoid material of construction constraints that would
result if wetted sensors were used. When the fluid moves faster, more pulses
are generated. The transmitter processes the pulse signal to determine the flow
of the fluid. Transmitters and sensing systems are available to sense flow in
both the forward and reverse flow directions
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