System Sensor D4120 4-wire Photoelectric Duct Smoke Detector

The System Sensor D4120 is a 4-wire photoelectric low-flow duct smoke detector features two DPDT Form-C relay contacts. Duct sensor housing contains D4S Sensor Component and 2D51 plug-in head. Operating voltage 24 VAC/DC or 120VAC 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 — ETX Metal exhaust tube duct width 1ft (0.3m) NOTE: Replaces System Sensor DH100ACDCP. Backward compatibility with existing Innovair products, including remote accessories​​.