procession vortex flow meter install one group sprial guide buffle in the side of entrance, while the fluid enter the flow sensor, the guide buffle will generate the fluid generate strong swirl flow, when the fluid enter expansion section, the swirl flow will generate second time rotating under the effect of counterflow, and shape the swirl precession phenomenon of gyroscopic shape. The precession frequency in proportion to flow volume Feature Flow rate measurement in gas flow industry;Nominal diameters from DN25 to DN200 mm;Output signal:Analogue 4-20mA or pulses, Modbus RS485, can also add HART;Explosion-proof, ATEX certificate