Water level controller for a boiler

Details Water level controller for a boiler Water level controller for a boiler

1986-01-21

1987-05-05

Wayner, William E.

Fluid handling

Liquid level responsive or maintaining systems

Electrical characteristic sensing

122448R, F16K 2118, F22B 3742

Patent

active

046623906

ABSTRACT:
A water level controller for a boiler has electrical probe means (capacitive or conductive) to be arranged in the boiler to detect electrically the water level therein. An oscillator circuit generates an oscillator signal which first and second circuit means receive. When a capacitance probe is used, the first circuit means has a variable gain amplifier in which the gain is determined by variations in the capacitance of the probe according to the water level. The second circuit means comprises a variable gain amplifier in which the gain is determined by a variable resistance the value of which is representative of the desired operating water level. Third circuit means obtains a difference signal resultant from the output signals of said first and second circuit means, which is representative of the difference between the actual water level in the boiler and the desired operating level of the water in the boiler. Relays open and close the water supply respectively. Fourth circuit means energize said relays to open or to close the water supply, in response to the difference signal.

REFERENCES:
patent: 2477511 (1949-07-01), Comb
patent: 2931577 (1960-04-01), Bullen
patent: 3520638 (1970-07-01), McUmber et al.
patent: 4530372 (1985-07-01), Overton et al.

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