Siemens FDOOT441 is an advanced, flexible multi-criteria fire detector incorporating a redundant optical / thermal sensor. Additionally, Siemens FDOOT441 utilizes ASAtechnology™ a distinctive forward / backward, light-scattering technology that provides high-tech, unparalleled fire detection to the widest range of fire types allowing the detector to distinguish non-threatening deceptive phenomena. Each Siemens FDOOT441 unit is UL 268 7th edition listed incorporating advanced built-in ISOtechnology™ - True Class-X SLC operation (use is optional) greatly improving system reliability and circuit integrity while providing advanced addressable fault finding.

The unit may be programmed as a high-sensitivity detector, with a 0.2 %/ft Pre-Alarm threshold and 1.0 %/ft Alarm threshold thus meeting NFPA 76 requirements (Standard for the Fire Protection of Telecommunications Facilities) as a Very Early Warning Fire Detector (VEWFD). Every FDOOT441 unit is a multi-purpose, addressable detector providing a complete contemporary solution meeting fire detection needs for commercial facilities. Each individual FDOOT441 sensor can be field programmed for simultaneous and / or independent functionality, depending upon the precise customer and application requirements.

For example, the detector can simultaneously utilize the optical and heat sensors for enhanced multi-criteria fire detection, as well as provide independent outputs for heat detection. Any combination of the sensors is possible.

Datasheet: FDOOT441

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