초록 ▼

A circuit and apparatus for magnetically sensing fluid flow through a conduit. The circuit includes a sensor and a sensor magnet for biasing the sensor in an on condition. A second magnet indicative of the relative position of a conduit valve substantially neutralizes the sensor magnet when the valv

A circuit and apparatus for magnetically sensing fluid flow through a conduit. The circuit includes a sensor and a sensor magnet for biasing the sensor in an on condition. A second magnet indicative of the relative position of a conduit valve substantially neutralizes the sensor magnet when the valve is closed to prevent fluid flow, and does not substantially neutralize the sensor magnet when the valve is open to permit fluid flow. The sensor can be a Hall effect sensor, and the sensing of fluid flow causes an indication current to flow. Circuitry is provided to apply a voltage to a load in response to the indication current.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for sensing fluid flow in a conduit, comprising:a valve which prevents passage of fluid in a closed state, and which allows passage of fluid in an open state;a first magnet attached to the valve; anda sensor circuit and Hall effect sensor associated with the

[ What is claimed is:] [1.] An apparatus for sensing fluid flow in a conduit, comprising:a valve which prevents passage of fluid in a closed state, and which allows passage of fluid in an open state;a first magnet attached to the valve; anda sensor circuit and Hall effect sensor associated with the valve, such that the sensor circuit senses the open or closed state of the valve based on a relative position of the first magnet, wherein the Hall effect sensor is biased in an on state by a second magnet, wherein the first magnet substantially neutralizes the second magnet when the valve is in a closed state, and the first magnet does not substantially neutralize the second magnet when the valve is in an open state.