The FL50-11000 detector in ATEX application is equipped with 1 ultraviolet sensor and 1 infrared sensor, and is capable of detecting a flame produced by a fire within its field of vision in a few seconds. The operating principle is based on the detection of infrared (IR) and ultraviolet (UV) radiation emitted by a flame. The detector is fitted with a special internal circuit for regular automatic testing or remote manual testing. The instrument housing is constructed in ATEX-approved Ex-d application aluminium alloy, with particularly robust attributes, and offers practical installation.