Primary flame safeguard system

Details Primary flame safeguard system Primary flame safeguard system

1975-08-26

1977-01-04

Favors, Edward G.

Combustion

Process of combustion or burner operation

307117, 431 78, 431 80, 431 25, F23N 512

Patent

active

040009610

ABSTRACT:
Flame supervisory method and apparatus in which a cross-checking relay system is controlled jointly by time-delay factors and a two-state control signal derived from the flame and having respectively pre-flame and flame-responsive polarity characteristics produced by reflexive bias and regenerative amplification and conversion of the basic flame-detection current to a control signal determining either switch-over to full flame burner operation or lock out of the system under ignition failure conditions. The two control states of the converted flame-detection signal are of a self-locking character, the pre-flame state tending to inhibit false response of the relay system to spurious flame signals, and the converted control signal in general being highly discriminative owing to an abrupt, non-linear change in polarity differentiating it from the pre-flame state.

REFERENCES:
patent: 3445172 (1969-05-01), Zielinski
patent: 3644074 (1972-02-01), Cade
patent: 3681681 (1972-08-01), Auslander
patent: 3701137 (1972-10-01), Hulsman
patent: 3847533 (1974-11-01), Riordan

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