The flame detector FL10 is capable of detecting within a few seconds a flame produced by a fire within its field view. It finds particular application in the places where it is assumed that a fire can develop quickly such example in the stores of petroleum products, paints, plastics, alcohols, etc.. The operating principle is based on the detection of the infrared radiation emitted by a flame. The circuitry and advanced electronic components used, make the detector very efficient and at the same time highly immune to false alarms typically disturbances natural or produced in the protected environment. The enclosure is made ??of polycarbonate self-extinguishing and has remarkable qualities of robustness and easy installation.