Bilevel flame signal sensing circuit

Details Bilevel flame signal sensing circuit Bilevel flame signal sensing circuit

F - Mech Eng,Light,Heat,Weapons

23

Q

341/25

F23Q 9/14 (2006.01) F23N 5/12 (2006.01) F23N 5/24 (2006.01) F23N 5/20 (2006.01)

Patent

CA 1171156

ABSTRACT OF THE DISCLOSURE A fuel burner control system that has a fail safe mode of operation utilizes a flame sensing means that controls two separate signal processing circuits that have two different threshold levels of operation. Each of the signal processing circuits controls a separate switch means and these switch means are interrelated to ensure that a pilot valve and main valve are opened in sequence and that a pilot flame is properly burning before the main valve is opened. If the flame sensing means for the device senses any abnormality, the interrelationship of the output circuits prevents the main valve from opening.

379075

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