Patent ID: 6182507
Filing Date: 2001-02-06
Classification: G01M,G01N

Abstract:
A water sensor, comprising:a housing that has at least one inlet port formed therein for allowing water to pass therethrough when said at least one inlet port is submerged in water;a piston mounted in said housing for sliding engagement therein;a rod coupled on a first end thereof to a first face of said piston, said rod extending through said housing to a second end of said rod residing outside of said housing;a positioner for fixing an initial position of said rod relative to said housing before said housing is submerged in water; andan expander in communication with a second face of said piston opposite said first face and in communication with said at least one inlet port, said expander being inert in air and reactive with water to generate a pressure force on said second face which causes said positioner to yield said initial position and said piston to move in said housing, whereby movement of said piston causes said rod to further protrude from said housing.