DS 250 Series Photoelectric Smoke Detector
The DS250 Series Detectors are UL Listed, open-area photoelectric
smoke detectors designed for use with commercial fire protective
signaling systems and household fire warning systems (see NFPA
72, "The National Fire Alarm Code"). The detectors are available in
2- and 4-wire models with an optional 135°F (57°C) fixed-temperature
heat sensor.