Flame Detector C554A Cadmium Sulfide for R4166 R4184 R8182 R8184 R8185 R8404 R8991 R7997 1 Inch 1/2 Inch Photoconductive flame sensing device for sequencing oil burner systems. 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 Replaceable CAD cell If you are not satisfied for any reason products may be returned within 30 days of shipment for a credit or exchange (provided the product is undamaged), except where noted, NOT RETURNABLE. Return documentation should clearly specify credit or exchange. Returned items must be in the original packaging. All returns must include a return authorization (RGA) number that can be obtained by contacting our Customer Service Department. Original shipping cost deducted. Reference to brand names and numbers are for reference only, and not meant to imply that they are made by that manufacturer (OEM). Sometimes images shown are generic and not meant to infer that they are actual. The parts will work as intended and are high quality and precision tested. Track Page Views With Auctiva's FREE Counter