Combustion detection apparatus

Combustion – Timer – programmer – retarder or condition responsive control – Sensor of first burner controls second burner – e.g. – pilot...

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431 76, F23Q 908, F23N 500

Patent

active

041404750

ABSTRACT:
An improved combustion detection apparatus is disclosed that can be employed in a fail-safe control circuit for a combustion apparatus to operate a shut-off valve in the fuel supply in response to the presence or absence of combustion. The improved combustion detector is an electrode assembly of a solid metal oxide member and electrodes in the form of electrical conducting coatings on opposite sides of the metal oxide member. The metal oxide has the characteristic of generating an electromotive force by transfer of oxygen ions therethrough. The combustion detector is placed in the vicinity of a flame from a pilot or main burner of the combustion apparatus. The oxygen gradient established by the burner flame and the resultant high temperature of the metal oxide member provides an instantaneous response to ignition or extinguishment of the burner flame. There is also disclosed an improved metal coating and method for its application on the metal oxide member which greatly increases its operational life over metal coatings of the prior art.

REFERENCES:
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patent: 2766440 (1956-10-01), Marsden, Jr.
patent: 3213922 (1965-10-01), Weber
patent: 3213922 (1965-10-01), Weber
patent: 3462318 (1969-08-01), Bjornson
patent: 3645875 (1972-02-01), Record et al.
patent: 3914169 (1975-10-01), Horowitz
patent: 4032286 (1977-06-01), Kobayashi et al.
patent: 4037773 (1977-07-01), Record
"Solid Electrodes - New Applications for ZrO.sub.2 ", Zircoa News Focus Chemetals Division, Diamond Shamrock Chemical Co.-10/20/75.

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