Flame sensor for a burner
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United States of America Patent
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Feb 5, 2008
Grant Date -
Jun 30, 2005
app pub date -
Dec 7, 2004
filing date -
May 19, 2003
priority date (Note) -
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Abstract
A flame sensor circuit is used to sense the presence or absence of a flame in a burner. A first sensor generates a first intensity signal which is proportional to the light intensity of the flame in the burner. A second sensor generates a second signal produced by the flicker of the flame. The presence of both the first and second signals is sensed and if both are present, an output signal is generated to indicate the presence of the flame in the burner.
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