Flame detection

Details Flame detection Flame detection

1976-05-18

1978-05-09

Swann, III, Glen R.

Communications: electrical

Systems

Call station

431 78, 340222, 340419, G08B 1706

Patent

active

040889840

ABSTRACT:
A flame detecting apparatus in which a detecting electrode is disposed in a flame, the base of a transistor is connected to the detecting electrode and biased with a predetermined DC voltage derived from a biasing circuit, the biasing circuit including a resistor and the impedance of the flame, an AC signal is applied to the emitter of the transistor, and an amplified AC signal is derived from the collector of the transistor as an output signal; the output signal being used as a control signal for a fuel supply control and/or an indicator.

REFERENCES:
patent: 3627458 (1971-12-01), Wade
patent: 3671815 (1972-06-01), Eberle et al.
patent: 3836857 (1974-09-01), Ikegami et al.
patent: 3986813 (1976-10-01), Hewitt

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