Bilevel flame signal sensing circuit

Details Bilevel flame signal sensing circuit Bilevel flame signal sensing circuit

1980-08-18

1983-03-08

Scott, Samuel

Combustion

Timer, programmer, retarder or condition responsive control

Sensor of first burner controls second burner, e.g., pilot...

431 25, 431 51, 431 71, F23Q 908

Patent

active

043759513

ABSTRACT:
A fuel burner control system that has a fail safe mode of operation utilizes a flame sensing means that controls two separate signal processing circuits that have two different threshold levels of operation. Each of the signal processing circuits controls a separate switch means and these switch means are interrelated to ensure that a pilot valve and main valve are opened in sequence and that a pilot flame is properly burning before the main valve is opened. If the flame sensing means for the device senses any abnormality, the interrelationship of the output circuits prevents the main valve from opening.

REFERENCES:
patent: 2260977 (1941-10-01), Jones
patent: 2775291 (1956-12-01), Wilson
patent: 3574496 (1971-04-01), Hewitt
patent: 3902839 (1975-09-01), Matthews
patent: 4087229 (1978-05-01), Teichert et al.
patent: 4137035 (1979-01-01), Cade
patent: 4197082 (1980-04-01), Matthews
patent: 4231732 (1980-11-01), Newport et al.
patent: 4242079 (1980-12-01), Matthews
patent: 4304545 (1981-12-01), Matthews

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