PELTEK Vortex Flowmeters make use of principle called the von karman effect. This principle sates that flow around a bluff body will generate vortices on alternate sides of the bluff body. Vortex Flowmeters contains a bluff body in the form of a piece of material that has broad, flat front. This piece of material extends vertically into the flow stream. Flow velocity is proportional to the number of vortices generated. Flow rate is calculated by multiplying flow velocity with the area of the pipe cross-section.