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

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  • $325.50
  • Regular price $457.94

The InnovairFlex™ Series, D4120, 4-wire photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints and mounts to round or rectangular ductwork. This unit senses smoke in the most challenging conditions, operating in airflow speeds from 100 to 4,000 feet per minute, temperatures of –4°F to 158°F, 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. The improved cover design isolates the sensor head from the low-flow feature for simple maintenance.

The InnovairFlex housing provides ample wiring space, a ¾-inch conduit knockout, and a built-in short circuit protectionto prevent damage to sensitive components during installation. The high contrast terminal designations make wiring easy. With a 2:1 sensor-to-power capability, the power board of the D4120 may be used to simultaneously monitor a second D4S sensor (i.e., supply and return side). Up to 50 InnovairFlex detectors can be interconnected. When one unit senses smoke, all interconnected detectors will switch the relays, and only the detector sensing smoke will go into alarm, thus pinpointing the fire source.

An easy-access Test/Reset button makes it possible to test the unit with the cover on. Three DIP switches can be used to configure the following field selectable settings: cover tamper delay, number of sensors to be controlled, shut down on trouble option. Each power board has two LEDs that can be used to indicate the status of connected sensors. A quick reference label imprinted on the cover displays the LED status indications (Standby, Maintenance, Trouble, and Alarm). The InnovairFlex duct smoke detector can be customized to meet local codes and specifications without additional wiring. The new InnovairFlex product line is compatible with all previous Innovair models, including the remote test accessories.

WARNING: Duct smoke detectors are NOT a substitute for open area smoke detectors; NOT a substitute for early warning detection; NOT a replacement for a building’s regular fire detection system.


Wiring: 4-wire
Operating Temperature Range: -4°F to 158°F (-20°C to 70°C)
Storage Temperature: -22°F to 158°F (-30°C to 70°C)
Operating Humidity Range: 0% to 95% relative humidity non-condensing
Air Duct Velocity: 100 to 4000 ft./min. (0.5 to 20.32 m/sec)
Dimensions: Rectangular: 14.38 in (37 cm) L; 5 in (12.74 cm) W; 2.5 in (6.36 cm) D Square: 7.75 in (19.7 cm) L; 9 in (22.9 cm) W; 2.5 in (6.36 cm) D
Voltage Range: 20-29 VDC; 24 VAC 50-60 Hz; 120 VAC 50-60 Hz
Alarm auxiliary contacts (DPDT): 10A @ 30 VDC (resistive); 10A @ 250 VAC (resistive); ½ HP @ 240 VAC ; ¼ HP @ 120 VAC
Alarm Initiation Contacts: 2.0A @ 30 VDC (resistive)
Power Supply Voltage: 20-29 VDC; 24 VAC, 50-60 Hz; 120 VAC 50-60 Hz
Input Capacitance: 270 ?F max.
Alarm Current: 65 mA @ 24VDC 135 mA RMS @ 24VAC 60Hz 35 mA RMS @ 120VAC 60Hz