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Introduce Of Turbine Flow Meter And Vortex Flow Meter

Introduce of Turbine Flow Meter and Vortex Flow Meter


Turbine Flow Meter

There are many different manufacturing designs of turbine flow meters, but in general they are all based on the same simple principle. Fluid moves through a pipe and acts on vanes, causing a turbine rotor to spin. The rotor spins as the liquid passes through the blades. The turbine blade motion is sensed by a magnetic pick-up and an electrical pulse is generated. The number of electrical pulses counted for a given period of time is directly proportional to flow volume. To achieve a repeatable result, the liquid flow must be fully developed and stable across the cross section of the pipe. To achieve this stable profile, a few diameters of straight pipe on the inlet and the outlet are required to achieve accurate measurements. They can be used for clean liquids with viscosities up to 50 centistokes. The turndown ratio can be as high as 100:1 if the turbine meter is calibrated for a single fluid and used at constant conditions. The majority of turbine meters have an accuracy of 0.5% to 1.5% of reading.

Vortex Flow Meter

Vortex meters make use of a natural phenomenon that occurs when a liquid flows around a bluff object. Eddies or vortices are shed alternately downstream of the object. The frequency of the vortex shedding is directly proportional to the velocity of the liquid flowing past the bluff object. The three necessary components of a vortex flow meter are a bluff body mounted in the flow meter bore, a sensor to detect the presence of the vortex and generate an electrical impulse, and a signal amplification circuit.The main advantages of vortex meters are their low sensitivity to variations in process conditions and low wear relative to orifices or turbine meters. Also, initial and maintenance costs are low. Performance with slurries or high viscosity liquids is poor. Used in both gas and liquid applications, Vortex flow meters are used abundantly in steam measurement applications. The majority of Vortex flow meters cost $400 to $1,000. Accuracies are typically in the range of 0.5% to 1.0% of reading.

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