System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector

The SYSTEM-SENSOR-D4120 4-wire photoelectric, low-flow, duct smoke detector senses smoke in the most challenging conditions, operating in airflow speeds of 100 to 4,000 feet per minute, temperatures of 4F to 158F, and a humidity range of 0 to 95 percent (non-condensing). A plug-in sensor head offers improved false alarm immunity and simple installation, testing, and maintenance.

With its 2:1 sensor-to-power capability, the power board of the D4120 may be used to monitor a second sensor, D4S, simultaneously (i.e., supply and return side). As many as 50 InnovairFlex detectors can be interconnected. When one unit senses smoke, all interconnected detectors will switch their relays; only the detector sensing smoke will go into alarm, thus pinpointing the fire source.

The D4120 features a pivoting housing that fits both square and rectangular footprints and mounts to round or rectangular ductwork. The unit is equipped with a cover design isolates the sensor head from the low-flow feature for simple maintenance.

UPC: 783863034411
Also known as: BK-D4120

Technical Specifications: Rectangular Dimensions: 14.38 in (37 cm) Length; 5 in (12.74 cm) Width; 2.5 in (6.36 cm) Depth Square Dimensions: 7.75 in (19.7 cm) Length; 9 in (22.9 cm) Width; 2.5 in (6.35 cm) Depth Weight: 2.5 lbs (1.14 kg) Air Duct Velocity: 100 to 4000 ft/min (0.5 to 20.32 m/sec) Power Supply Voltage: 120 VAC, 50-60 Hz Reset Voltage: 10 VAC min Reset time: (with RTS151) .03 to 0.3 sec. Reset time: (by power down) 0.6 sec. max. Power up time: 35 sec. max. Alarm response time: 15 sec. Max. standby current: 20 mA RMS @ 120VAC 60 Hz Max. alarm current: 35 mA RMS @ 120VAC 60 Hz Alarm initiation contacts: (SPST) 2.0A @ 30 VDC (resistive) Alarm auxiliary contacts: (DPDT) HP @ 120 VAC

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