United States Patent Application Publication 20150348393

Flame Sensing System

Application Number 14/316,489

Filed 6/26/2014

Jed Margolin

 

 

ABSTRACT OF THE DISCLOSURE

This invention relates to the field of sensing flames in equipment such as gas furnaces by using the electrical properties of flames. In a first group of embodiments flame rectification is used to cause distortion of a signal having a selected waveform. A harmonic of the distorted waveform is detected thereby providing flame proof. In a second group of embodiments flame rectification is used as a mixer to cause two signals having selected waveforms to produce sum and difference signals. The sum and/or difference signals are detected thereby providing flame proof.

 

 

 

 

References


The listed links are the original links. In some cases they may be broken. The PDF version was made from the original link.

 

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(Metcalfe Figure 1 Contacts 7 and 8; Page 3, right column, lines 70 – 79)

 

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Ref. 3:   U.S. Patent 2,136,256 Furnace Control System issued Nov 8, 1938 to A.L Sweet, assigned to General Electric Company (age 1, left column, line 4 – Page 2, left column line 2)

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