Automatic fuel ignition system with redundant flame sensing

Details Automatic fuel ignition system with redundant flame sensing Automatic fuel ignition system with redundant flame sensing

1976-06-28

1978-05-02

Sprague, Kenneth W.

Combustion

Timer, programmer, retarder or condition responsive control

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

431 25, 431 66, F23Q 908

Patent

active

040872297

ABSTRACT:
An automatic fuel ignition system has a spark generator for igniting a pilot burner and two separate pilot flame sensing systems to provide a redundant safety check of flame ignition before the main burner gas is turned on. One sensing system includes a rectifying electrode in the pilot burner flame and a electronic flame sensing circuit responsive to the flame conductivity while the second sensing system includes a flame switch located in the flame and responsive to the heat of the flame.

REFERENCES:
patent: 3079984 (1963-03-01), Wright et al.
patent: 3574496 (1971-04-01), Hewitt
patent: 3644074 (1972-02-01), Cade
patent: 3902839 (1975-09-01), Matthews

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