Siemens (Pyro) FDOOT441

The Siemens FDOOT441 is an intelligent multi-criteria fire detector combining redundant photoelectric and thermal sensors with ASAtechnology forward/backward light-scattering optics for comprehensive fire detection. This addressable detector excels at distinguishing real fires from non-threatening phenomena like dust and steam, with configurable pre-alarm thresholds for Very Early Warning Fire Detection (VEWFD) applications. Field-programmable for independent or simultaneous sensor operation, the FDOOT441 suits data centers, atriums, laboratories, and industrial areas where false alarm prevention is critical.

Key Features

• Redundant optical and thermal sensors in single unit
• ASAtechnology forward/backward light-scattering for high sensitivity
• Addressable on Siemens FireFinder and compatible panels
• Field-programmable pre-alarm at 0.2%/ft for VEWFD compliance
• 0.5%/ft standard alarm, 1.0%/ft high sensitivity modes

Technical Specifications

• Detection method: Dual optical/thermal with ASAtechnology
• Addressability: Siemens 252, 504, FireFinder XLS systems
• Pre-alarm: 0.2%/ft obscuration (VEWFD mode available)
• Sensitivity: 1.0%/ft standard alarm threshold
• Operating voltage: 15-28 VDC
• Current: 40 µA standby, 100 mA alarm state
• Temperature: -4°F to 131°F (-20°C to 55°C)

Certifications

• UL 268 Listed dual-sensor detector with multicriteria
• NFPA 72 Section 17.6 VEWFD compliant
• RoHS compliant, lead-free components