Vortex flowmeters

The vortex principle is based on sensing the vortex formation that occurs behind a body, which is inserted into a liquid or gas stream. All Vortex flow meters thus have an obstruction called a «bluff body», which ensures that an alternating flow of vortices is formed.

The distance from the center of one vortex to the next is called the wavelength, and is directly related to the diameter of the bluff body design. In a Vortex flow meter, the bluff body and housing are designed so that the frequency of the vortices is directly proportional to the flow rate.