公开(公告)号：US3594746A

公开(公告)日：1971-07-20

申请号：US3594746D

申请日：1967-12-27

Applicant: COMBUSTION ENG

Inventor： PILEIKA VYTAUTAS ,  JONES HARRY B

IPC: F23M11/04 ,  G08B29/00 ,  G08B17/12

CPC classification number: F23M11/045

Abstract: A system for detecting a fault in the output signal of a flame scanner circuit, the system comprising ball means, normally gravity biased to a nonblocking position, periodically pneumatically activated to intercept, and block, the scanning view of a glow discharge tube detector used to indicate the presence of a flame. A logic circuit having an AND gate receives independent signals from the pneumatic activating means for the ball means (indicating ball means actuation) and from the flame scanner circuit (indicating positive firing of the glow discharge tube detector). The tube detector, of course, should not be firing, and thus signaling the existence of a flame, when its scanning view is blocked by the ball means. If both of the abovementioned signals reach the AND gate at the same instant, the gate will operate to pass a signal to a fault indicator which may operate any suitable alarm means to indicate a fault in the glow discharge tube detector.