G - Physics – 01 – J
Patent
G - Physics
01
J
341/19, 340/155.
G01J 1/44 (2006.01) F23N 5/08 (2006.01) G01J 5/10 (2006.01)
Patent
CA 1037142
ABSTRACT OF THE DISCLOSURE A substantially fail-safe system for detection of flames, particularly flames in a fuel burner. A flame sensing means and amplifier that is responsive to the flicker frequency of a burning flame is coupled by a fail-safe type of circuit to a second safety type of amplifier. The second safety type of amp- lifier is a cyclic type of amplifier that requires a continuously cycling input signal in order for it to have an output indicating the existence of a flame at the flame sensing means. The fail- safe coupling between the two amplifiers is a radiation emitting device and a radiation responsive device that are electrically isolated, and which are so selected and arranged that the system becomes inoperative upon a number of different types of failures.
205665
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