550/2014 - An apparatus (so-called ‘flame detector’) consisting of passive infra-red and ultraviolet sensors, an optical filter, an evaluation unit, three output relays (fire alarm, fault and auxiliary relay) and a three-colour status LED (indicating normal operation, fire and fault condition), in a cylindrical housing with a diameter of approximately 12 cm and a length of approximately 25 cm. Its operating range is 18 to 30 V DC. The apparatus is a component of a fire alarm system. The sensors simultaneou - The Trade Hub