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The flame sensor contains a seleni-um photoelement which generates aphotovoltage on exposure to lightand is classified as fault-proof.For permanent operation, the ampli-fier is tested for reliable operationevery 10 s.Flame detector with contact outputThe flame detector must be fault-prooffor permanent operation as only thepart located in the BCS flame detec-tor is tested for reliable operation eve-ry 10 s.