NOTIFIER LOW PROFILE PHOTOELECTRONIC PLUG-IN SMOKE DETECTOR ADDRESSABLE The FSP-951 Series intelligent plug-in smoke detectors are designed for both performance and aesthetics, and are direct replacements for the FSP-851 Series. A new modern, sleek, contemporary design and enhanced optical sensing chamber is engineered to sense smoke produced by a wide range of combustion sources in accordance with more stringent code standards. CONVENTIONAL The SD-651 low-profile photoelectronic detector uses a state-of-the-art optical sensing chamber. This detector is designed to provide open area protection and to be used with compatible UL-listed control panels only. The capability of plugging this detector into a variety of special bases makes it more versatile than equivalent direct-wired models. SD-5601P SD-5601P Conventional heat detector FST-851 FST-851/W Addressable Heat Detector Size: Height: 2.0 inches Diameter: 4.1 inches Weight: 3.1 oz (88 g) Operating Temperature Range: 0°C to 49°C (32°F to 120°F) Operating Humidity Range: 10% to 93% Relative Humidity non-condensing Operating Voltage: 8.5 to 35 V DC Latching Alarm: Reset by momentary power interruption.