Primary flame safeguard system

Details Primary flame safeguard system Primary flame safeguard system

G - Physics

05

D

341/25, 340/155.

G05D 23/19 (2006.01) F23N 5/12 (2006.01) F23N 5/24 (2006.01)

Patent

CA 1068376

Abstract of the Disclosure 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 lockout 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.

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