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The flowing fluid impinges on the turbine blades, imparting a force to the blade surface and setting the rotor in motion. When a steady rotation speed has been reached, the speed is proportional to fluid velocity. Turbine flowmeters are used for the measurement of natural gas, steam and liquid flow.

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. A turbine flowmeter measures the flowrate from the number of revolutions of a blade placed in the flow. The speed of revolutions of the blade with an axis parallel to the flow direction is proportional to the speed of the flow.

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.

Features:

• Exceptionally reliable digital outputs. Used for a variety of liquid and gas flow sensing applications
• Sizes available for 1/2 inch to 12 inches
• Offers high turn-down with minimum uncertainty and very repeatable output.
• Ideal for fluids with viscosity of 500 cst or less for 2 inch and larger flowmeters
• Ideal for fluids with viscosity of 200 cst for smaller than 2 inch flowmeters.
• Quick response time
• Low rotor inertia
• Suitable for measuring fluctuating flows
• Requires digital readout for pulsating flows

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