Title:
FLAME DETECTOR CIRCUIT
Document Type and Number:
Japanese Patent JP3850606
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To provide a flame detector circuit which can judge a failure of circuit that the amplification factor of an amplifier deviates from an allowable range, a failure of circuit that the output of the amplifier oscillates in addition to a failure of circuit that a constant voltage exceeding a specified threshold level is outputted continuously from the amplifier regardless of the input level to the amplifier.
SOLUTION: Input to an amplifier is switched periodically from the thermoelectromotive force of a thermocouple to a predetermined reference voltage. A decision is made that the circuit is faulty if the output level of the amplifier does not fall within a specified range when the reference voltage is inputted and/or if the output period of the amplifier is different from the period for switching the input of the amplifier to the reference voltage.
Inventors:
Ito, Koichi
Komuro, Atsushi
Kawachi, Takahiro
Komuro, Atsushi
Kawachi, Takahiro
Application Number:
JP1999000316601
Publication Date:
September 08, 2006
Filing Date:
November 08, 1999
Export Citation:
Assignee:
RINNAI CORP
International Classes:
F23N5/10; H01H37/32; H03K17/945; F23N5/02; H01H37/00; H03K17/94; (IPC1-7): F23N5/10; H01H37/32; H03K17/945
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