Patent ID: 6910498

Claim:
A liquid level control system for detecting and responding to changes in the level of liquid in a container, characterized by: a self-powered remote transmitter unit removably mountable in the liquid container, said transmitter unit comprising a transmission housing that defines a circuitry chamber and an interior float chamber, said transmission housing further having an opening in the lower portion of the float chamber such that said float chamber is in fluid communication with the liquid in the container; a buoyant float slidably inserted into said float chamber, said float vertically movable within said float chamber in response to changes in liquid level in the container, said float including a float magnet; a transmission circuit adapted for transmission of a radio frequency signal, said transmission circuit installed in said circuitry chamber and having a high magnetic switch and a low magnetic switch, each of which may be selectively positioned to define the high and low limits of a range of liquid levels, said switches in magnetic communication with said float magnet so as to close when in proximity with said magnet and to enable the transmission of a radio signal corresponding with said high or low liquid level, said transmission circuit including a programmable timing circuit which will prevent transmission of a radio signal unless and until said float magnet has been in proximity with one of said switches for a pre-programmed length of time; an antenna connected to said transmission circuit and housed within an antenna sheath extending from said transmission housing; and a receiver unit in radio frequency communication with said transmitter unit; an electronically actuated valve assembly in electronic communication with said receiver unit, said valve assembly in fluid communication with said liquid container.