Universal flow monitors, inc, usa, manufactures vortex shedding flow transmitters for the flow measurement of ultra-pure liquids. As the flow transmitters have no moving parts, the particles do not pile up degrading the liquid quality. Impurities are not introduced due to the absence of wetted metal parts. This is accomplished by means of special pvdf plastic. These flow transmitters can hold flows up to 9,500 lpm. The operation is performed with the vortex shedding principle, ie, when the fluid moves around the bluff-body vortices are produced, which is sensed by a piezoelectric crystal.
