Low liquid level advance warning alarm system with safety shut-o

Details Low liquid level advance warning alarm system with safety shut-o Low liquid level advance warning alarm system with safety shut-o

1990-10-23

1992-12-29

Reynolds, Bruce A.

Electric resistance heating devices

Heating devices

Immersion heater details

392451, 392501, 219494, 219512, 219523, 219553, F24H 100

Patent

active

051757923

ABSTRACT:
An advance warning control system for controlling the liquid level in a heating tank including an electrical immersion heater to provide a source of radiant energy, a control means operably associated with the immersion heater and the control means including a first normally open bi-metallic switch and a second normally closed bi-metallic switch which together operate to provide an advance warning upon energization of the first switch to give a predetermined time interval before energization of the second switch.

REFERENCES:
patent: 2839660 (1958-06-01), Davies
patent: 4156128 (1979-05-01), Craven
patent: 4234785 (1980-11-01), Lefebvre
patent: 4238666 (1980-12-01), Pomper
patent: 4327281 (1982-04-01), Jager et al.
patent: 4551619 (1985-11-01), Lefebvre
patent: 4707590 (1987-11-01), Lefebvre

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