Patent ID: 6289731
Filing Date: 2001-09-18
Classification: G01F,Y10S

Abstract:
A liquid level detector comprising:an internal tube, an electrically conductive coil wound on external surface of said internal tube, an external tube enclosing said internal tube, a float ball coated with magnetic material, a base, an upper fixing socket, and a circuit in electrical communication with said coil; whereinsaid float ball coated with magnetic material is disposed in said internal tube, a plurality of air apertures and a thread portion are formed at an upper end of said internal tube, said thread portion at said upper end of said internal tube is received in a tapped hole in said upper fixing socket, a bottom end of said internal tube is coupled to said base, and said base comprises at least one infiltration hole; such thatliquid entering said liquid level detector through said at least one infiltration hole causes said float ball to rise past said coil, thereby generating an inductance, said circuit converting said inductance to a voltage indicative of a liquid level in said liquid level detector.