Low water protector

Details Low water protector Low water protector

1995-09-22

1997-09-23

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 93, 361115, H02H 504

Patent

active

056711131

ABSTRACT:
A protection circuit for use with a hot water dispensing apparatus of the type which includes a reservoir and a heating element coupled to the reservoir for heating water retained therein. The protection circuit includes a conductivity detector coupled to the reservoir for detecting a desired quantity of water in the reservoir. A first sensor and a second sensor of the conductivity detector are coupled to the reservoir at spaced apart locations. A conductivity detector circuit is coupled to the first and second sensors and coupled to a control circuit of the hot water dispensing apparatus for preventing operation of the apparatus until a desired quantity of water is disposed in the reservoir.

REFERENCES:
patent: 4480173 (1984-10-01), Butterfield
patent: 4917005 (1990-04-01), Knepler
patent: 4978833 (1990-12-01), Knepler
patent: 5019690 (1991-05-01), Knepler

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