System Sensor® D4120

The InnovairFlex 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 of 100 to 4000 ft/min, temperatures of -4 to 158 deg F, and a humidity range of 0 to 95% (non-condensing). A plug-in sensor head offers improved false alarm immunity and simple installation, testing, and maintenance. An improved cover design isolates the sensor head from the low-flow feature for simple maintenance.

System Sensor® Duct Smoke Detector, 24 VAC, 0 to 95% Humidity Rating, -4 to 158 deg F Operating, 14.38 in L x 5 in W x 2.5 in D Rectangular/7.75 in L x 9 in W x 2.5 in D Square

• 4-wire photoelectric integrated low flow technology
• Air velocity rating from 100 ft/min to 4000 ft/min (0.5 m/s to 20.32 m/sec)
• Versatile mounting options square or rectangular configuration
• Plug-in sensor offers superb false alarm immunity and the latest sensor technology
• Broad ranges for operating temperature -4 to 158 deg F and humidity 0 to 95% non-condensing
• Patented sampling tube installs from front or back of the detector with no tools required
• Increased wiring space with a newly added 3/4 in conduit knockout
• One easy access Test/Reset button and improved LED status
• Patented interconnect feature for multi-fan shutdown
• New high contrast terminal designations
• Built-in short circuit protection from operator wiring errors
• Field selectable settings for configuring the detector
• Two DPDT Form-C relay contacts
• Backward compatibility with existing Innovair products including remote accessories

• Catalog https://assets.unilogcorp.com/2/ITEM/DOC/System_D4120_Catalog.pdf
• Instruction/Installation Manual https://assets.unilogcorp.com/2/ITEM/DOC/System_D4120_Manual.pdf
• Specification Sheet https://assets.unilogcorp.com/2/ITEM/DOC/System_Sensor_D4120_Specification_Sheet.pdf