System Sensor 2451 Photoelectric Smoke Detector

The System Sensor 2451 photoelectronic detectors utilize state-of-the-art, optical sensing chambers. Also, these detectors are designed to provide open area protection and to be used with compatible UL-listed control panels only. Besides, model 2451TH has the same specifications as Model System Sensor 2451, with the addition of a built-in fixed temperature (135°F–57°C) thermal detection unit. The capability of plugging these detectors into a variety of special bases makes them more versatile than equivalent direct-wired models. Features / Specifications Diameter: 4.0 inches Height: 2.4 inches Weight: 0.5 lb Operating Temperature: 0°C to +49°C (32°F to 120°F) Operating Humidity: 10% to 93% Relative Humidity Non-condensing Locking Alarm: Reset by momentary power interruption.