Patent ID: 6668643
Filing Date: 2003-12-30
Classification: G01F

Abstract:
A device for measuring the flow-rate of a fluid, comprising:an outer tubular body provided with an inlet pipe fitting and an outlet pipe fitting for the fluid; an inner tubular element made of transparent plastic material, which sealingly extends inside the outer tubular body, between said inlet and outlet pipe fittings; said outer tubular body being provided on opposite sides with openings for seating, respectively, a light-emitting element and a light-receiving element facing each other; an axially slidable light-shuttering member entrained by the flow within the inner tubular element, said light shutter being shaped to partialize the light beam between the light-emitting element and the light-receiving element to provide an electric signal proportional to the flow-rate; and a biasing spring member acting on the light-shuttering member to balance the thrust exerted by the fluid flowing along said inner tubular element of the device.