Patent ID: 6338278
Filing Date: 2002-01-15
Classification: G01F

Abstract:
A flow detector to detect and monitor the flow of fluid through a conduit comprising a housing to at least partially house a first flow detection element selectively moveable between a first position and a second position and a second flow detection element disposed to operatively engage said first flow detection element when in the second position coupled between a power source and a flow detection monitor such that when fluid flows through the conduit said first flow detection element moves from the first position to the second position to operatively engage said second flow detection element to activate the flow detection monitor and when fluid ceases to flow in the conduit said first flow detector element returns to the first position thereby disengaging said second flow detector element to deactivate said flow detection monitor, said first fluid detection element comprises a piston and an electrically conductive bias including a distal end portion operatively engaged therewith and said second flow detection element comprises a first electrical contact and a second electrical contact, said electrically conductive bias is disposed between said piston and said first electrical contact such that in the absence of fluid flow said piston is held into said first position, said first electrical contact is offset relative to said second electrical contact such that when said piston is in said first position, said distal end portion of said electrically conductive bias engages said first electrical contact and disposed in spaced relationship relative to said second electrical contact wherein fluid flow through said housing forces said piston to move to said second position causing distal end portion of said electrically conductive bias to engage said second electrical contact to activate said flow detection monitor, said first electrical contact and said second electrical contact each comprises substantially flat conductive member having a forward surface disposed in a substantially parallel relationship relative to the longitudinal axis of said housing, said forward surface of each said substantially flat conductive member comprises a relatively sharp leading edge and said flow detection monitor includes a means to count the number of flow events detected and a logic circuit to compare the total number of flow events detected to a predetermined number of flow events and to generate a signal when the predetermined number of flow events is detected to provide an indication thereof.