Vortex flow meters measure fluid velocity using a principle of operation referred to as the von Karmán efect, which states that when flow passes by a bluff body, a repeating pattern of swirling vortices is generated. In a Vortex flow meter, an obstruction in the low path, often referred to as a shedder bar, serves as the bluff body. The shedder bar causes process fluid to separate and form areas of alternating differential pressure known as vortices around the back side of the shedder bar.