Patent ID: 6722211
Filing Date: 2004-04-20
Classification: G01F

Abstract:
A multi-stage variable orifice flow obstruction sensor for measuring a fluid flow in an enclosed housing, the sensor comprising:a body member receivable within the enclosed housing, the body member defining an aperture therethrough; a cover member engaged to the body member and disposed within the aperture, the cover member being movable between open and closed positions with respect to the aperture; a flow-limiting obstruction member engaged to the body member and disposed within the aperture adjacent the cover member, the flow-limiting member being sized and configured to apply a generally opposing force to the cover member when the cover member extends to the open position and contacts the flow-limiting member, the flow-limiting member being bendable in response to movement of the cover member; and wherein a pressure differential of the fluid is sensed to measure the fluid flow therefrom.