Flame rectification sensor employing pulsed excitation

Details Flame rectification sensor employing pulsed excitation Flame rectification sensor employing pulsed excitation

1993-07-29

1995-12-05

Price, Carl D.

Combustion

Process of combustion or burner operation

Starting or shutdown procedure

431 2, 431 25, 431 16, F23N 500

Patent

active

054723361

ABSTRACT:
A flame rectification type flame sensor circuit and method in which a generator injects periodic pulses of alternating voltage into a flame region, the voltage across the flame region being processed by a filter/amplifier which, in proper operation, produces a non-zero output signal only during the time a flame is present and a pulse of alternating voltage is being supplied by the generator. Final indication of a flame is produced only if a non-zero output signal occurs during the time a pulse of alternating voltage is being supplied, and not during the time between successive pulses of alternating voltage. Failure of an electrical component in the filter/amplifier is indicated if a non-zero output signal occurs during the time between successive pulses of alternating voltage.

REFERENCES:
patent: 3576556 (1971-04-01), Sellors, Jr.
patent: 3781161 (1973-12-01), Schuss
patent: 4243372 (1981-01-01), Cade
patent: 4295129 (1981-10-01), Cade
patent: 4444551 (1984-04-01), Mueller et al.
patent: 4672324 (1987-06-01), van Kampen
patent: 4955806 (1990-09-01), Grunden et al.

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