Honeywell - On flame failure, the light sensitive cadmium sulfide cell, in conjunction with flame sensing circuitry, causes the Protectorelay® control to shutdown the main oil burner.
Glass-to-metal hermetic seal in plug-in cell prevents deterioration by humidity, soot or oil fumes.
Honeywell - Cadmium-Sulfide Flame Detector with 60 in. leads, Type "R" mounting bracket and 130367 Cad Cell
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