Flame detector

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G - Physics

01

J

340/155.1

G01J 5/10 (2006.01) F23N 5/08 (2006.01) G01R 23/15 (2006.01)

Patent

CA 1104234

Abstract of the Disclosure A method and apparatus for processing signals produced by a flame detector. A phase-locked loop is used to generate a binary in- dication of whether the signal from a flame probe is within a predeter- mined frequency band. A signal indicative of the average analog value of the resulting pulse train is produced and tested to determine whether it is in a range consistent with flame presence. The resultant binary signal is ANDed with a binary determination of whether the average DC value of the probe signal is within a range consistent with flame pres- ence, and if both the DC and the frequency indications imply possible flame presence, then flame presence is indicated. 760970

305044

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