System Sensor D4120 - Smoke Detector - Duct Smoke Detector,
System Sensor D4120 - Smoke Detector - Duct Smoke Detector,

System Sensor D4120 - Smoke Detector - Duct Smoke Detector,

System Sensor 4 Wire Photo Low Flow.Air Duct Smoke Det
Part Number: 674179
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System Sensor D4120 | Duct Smoke Detector, 4-wire, Photoelectric, Low-flow

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, operati ng in airflow speeds of 100 to 4,000 feet per minute, temperatures of -4ºF to 158ºF, and a humidity range of 0 to 95 percent (noncondensing). 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.

The InnovairFlex housing provides ample wiring space, a 3/4-inch conduit knockout, and built-in short circuit protection to prevent damage to sensitive components during installation. High contrast terminal designations make wiring easy. 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.

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 field selectable settings: cover tamper delay, number of sensors to be controlled, and shut down on trouble option. Each power board has two LED s that can be used to indicate the status of connected sensors, and a quick reference imprinted on the cover explains 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 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.

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 4,000 feet per minute, temperatures of –4°F to 158°F, and a humidity range of 0 to 95 percent (noncondensing). 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.




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System Sensor - D4120 - Features

  • 4-Wire Photoelectric, integrated low-flow technology
  • Air velocity rating from 100 ft/min to 4,000 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 thelatest sensor technology
  • Broad ranges for operating temperature (-4ºF to 158ºF) 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 added3/4-inch 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 seleble settings for configuring the detector
  • Two DPDT Form-C relay contacts
  • 24 V AC/DC or 120 V AC
  • Backward compatibility with existing Innovair products, including remote accessories
  • 4-Wire Photoelectric, integrated low-flow technology
  • Versatile mounting options: square or rectangular configuration
  • Increased wiring space with a newly added ¾-inch conduit knockout
  • Plug-in sensor offers superb false alarm immunity and the latest sensor technology
  • Broad ranges for operating temperature (–4°F to 158°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 ¾-inch conduit knockout
  • One easy-access Test/Reset button and improved LED status
  • Patented interconnect feature for multi-fan shutdown
  • New high contrast terminal designations
  • General Information
  • Name: System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector, 24VDC/120VAC, (Replaces DH100ACDCLP), Honeywell International, Inc, System Sensor
  • Category: System Sensor, Fire, Fire Detection Devices, Duct Smoke Detectors
  • UPC Code: 783863034411
  • Country of Origin: Mexico. Country of origin is subject to change.



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System Sensor - D4120 - Product Categories

  • Security
  • Fire Alarm Systems
  • Smoke and Heat Detection



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System Sensor - D4120 - Specifications

UNSPSC Code46171600
Brand NameSystem Sensor
Connectivity TechnologyWired
ManufacturerHoneywell International, Inc
Manufacturer Part NumberD4120
Product LineInnovairFlex
Product ModelD4120
Product NameInnovairFlex D4120 Smoke Detector
Product TypeSmoke Detector



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System Sensor - D4120 - Physical Characteristics

Application/UsageAir Duct Protection
Depth2.5"
Depth (mm)63.5
Form FactorDuct Mount
Height14.4"
Technical Information-
Detectable MediumSmoke
Maximum Air Velocity20.32 m/s
Sensing TechnologyPhotoelectric



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System Sensor - D4120 - Documents and Downloads

System Sensor D4120 Specification SheetClick to View
System Sensor D4120 Product Data SheetClick to View
System Sensor D4120 Installation InstructionsClick to View
System Sensor D4120 Manufacturer BrochureClick to View

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