System Sensor D4120W Watertight 4-wire Photo Duct Smoke Detector

The System Sensor D4120W is a watertight 4-wire photoelectric low-flow duct smoke detector. Weatherproof housing contains a System Sensor ​2D51 4-wire conventional photoelectric sensor head. Features two DPDT Form-C relay contacts. Operating voltage 24 VAC/DC or 120VAC Backward compatibility with existing Innovair products, including remote accessories​​ COMPATIBLE SYSTEM SENSOR ACCESSORIES: — DST1 Metal sampling tube duct width up to 1ft (0.3m) — DST1.5 Metal sampling tube duct widths 1 ft to 2 ft (0.3 to 0.6 m) — DST3 Metal sampling tube duct widths 2 ft to 4 ft (0.6 to 1.2 m) — P48-21-00 End cap for metal sampling tubes — DST5 Metal sampling tube duct widths 4 ft to 8 ft (1.2 to 2.4 m) — RA100Z Remote annunciator alarm LED — DST10 Metal sampling tube duct widths 8 ft to 12 ft (2.4 to 3.7 m) — RTS151 Remote test station — APA151 Remote annunciator with piezo alarm RTS151KEY Remote test station with key lock — DH400OE-1 Weatherproof enclosure RTS2-AOS Multi-signaling accessory with add on strobe — ETX Metal exhaust tube duct width 1ft (0.3m)