![]() Sensors, generally piezoelectric or capacitance-type, located in or just behind the shredder bar are used to detect the pressure oscillation caused by the vortices leaving the shredder bar. The shedder bar is shaped to allow process fluid to separate and generate vortices around the back side of the shedder bar. In a vortex flow meter, the bluff body is known as a "shredder bar". It is for this reason that this type of flow meter is sometimes referred to as a "vortex shedding flow meter". a non streamlined body) is placed in the path of a fast-flowing stream, the fluid alternately separates from the object on its two downstream sides causing a repeating pattern of swirling vortices to be generated, aka a Kármán vortex street. The Von Kármá effect, states that when a bluff body (i.e. Pressure and/or temperature compensation can be used to allows mass flow measurements to be made. A simple calculation using fluid velocity and cross sectional area of the pipe allow the volumetric flow rate to be determined. A Kármán vortex street is a repeating pattern of swirling vortices, and in a vortex flow meter the rate of pressure oscillations caused by these vortices is measured and correlates to the fluid velocity. Using these inputs they can compute mass flow, as well as measuring volumetric flow making them useful for measuring steam and gas flows.Ī vortex flow meter's working principle exploits the phenomenon of "Kármán vortex streets". Multivariable vortex meters have an inbuilt RTD temperature sensor and pressure transducer. ![]() Since their introduction by Eastech in 1969, through their adoption by Yogokawa in 1972 and Emmerson Rosemount in 1994 they have become increasing accepted by instrument engineers due to their competitive price, ease of installation, and their ability to handle a wide range of process conditions. Vortex meters, especially the "smart" type are a popular choice in the process industry.
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