Optical flame fire detector FD 8040 is designed to provide early warning of a fire condition responding to open flame‎.‎ The fire detector reacts within the light spectrum of the flame and has maximum sensitivity of the infrared range‎.‎ The operation principle is based on the reception of flame emissions with their typical flicker frequency within the whole spectrum range‎.‎ The infrared sensor signal – amplified‎,‎ filtered and shaped is being sent to the time delay circuit‎.‎ If the flame impact has decreased during the time delay ‎,‎ the fire detector dos not activate‎.‎ The fire detector consists of printed board‎,‎ mounted in a plastic body with optical filter and bottom side‎.‎ The flat point pivot screw ‎(‎optional‎)‎ prevents the fire detector of unauthorized removal‎.‎ A 2 mm tip screwdriver is required for locking and unlocking‎.‎ The two red LEDs of the fire detector are indicating fire condition‎,‎ providing 360 angle visibility‎.‎ It is recommended that the fire detectors are mounted in premises‎,‎ where a possible development of fire condition is supplemented by flame‎.‎ Avoid mounting in premises with flickering lights‎.‎ The fire detectors shall be mounted on the ceiling in a way‎,‎ that do not exposure to direct sunlight‎.‎