System Sensor D4120W 4-Wire Photoelectric Duct Smoke Detector, Watertight

  • MPN: D4120W
  • JMAC ID: 200003877
$332.00
In Stock
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JMAC_ID:
200003877
df_manual_boost:
1.75
The SYSTEM-SENSOR-D4120W watertight 4-wire photoelectric 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 superior false alarm immunity. These features, plus a NEMA 4 rating, allow operators to mount the detector to rooftop HVAC equipment or use the detector in other harsh environments.

The D4120W provides unsurpassed environmental protection while simplifying installation, testing, and maintenance. The unit features a pivoting housing that fits various applications: both square and rectangular footprints mount to round or rectangular ductwork.

UPC: 783863034541
Also known as: BK-D4120W

Technical Specifications:
  • Alarm auxiliary contacts: (DPDT) ¼ HP @ 120 VAC
  • Alarm initiation contacts: (SPST) 2.0A @ 30 VDC (resistive)
  • Max. alarm current: 35 mA RMS @ 120VAC 60 Hz
  • Max. standby current: 20 mA RMS @ 120VAC 60 Hz
  • Alarm response time: 15 sec.
  • Power up time: 35 sec. max.
  • Reset time: (by power down) 0.6 sec. max.
  • Reset time: (with RTS151) .03 to 0.3 sec.
  • Reset Voltage: 10 VAC min
  • Power Supply Voltage: 120 VAC, 50-60 Hz
  • NEMA Enclosure Rating: Type 4 – Watertight Indoor/Outdoor
  • Air Duct Velocity: 100 to 4000 ft/min (0.5 to 20.32 m/sec)
  • Weight: 2.5 lbs (1.14 kg)
  • Square Dimensions: 7.75 in (19.7 cm) Length; 9 in (22.9 cm) Width; 2.5 in (6.35 cm) Depth
  • Rectangular Dimensions: 14.38 in (37 cm) Length; 5 in (12.74 cm) Width; 2.5 in (6.36 cm) Depth


For more information about the System Sensor D4120W, please contact us.
  • Broad ranges for operating temperature (–4°F to 158°F) and humidity (0% to 95% non-condensing)
  • Plug-in sensor offers superb false alarm immunity and the latest sensor technology
  • Versatile mounting options: square or rectangular configuration
  • (0.5 m/s to 20.32 m/sec)
  • Air velocity rating from 100 ft/min to 4,000 ft/min
  • 4-Wire Photoelectric, integrated low-flow technology
  • UV Resistant, UL listed housing and cover material
  • outdoor applications
  • NEMA Type 4 UL listed for non-hazardous indoor and
  • Backward compatibility with existing Innovair products, including remote accessories
  • 24 VAC/DC or 120VAC
  • Two DPDT Form-C relay contacts
  • Field selectable settings for configuring the detector
  • Built-in short circuit protection from operator wiring errors
  • New high contrast terminal designations
  • Patented interconnect feature for multi-fan shutdown
  • One easy-access Test/Reset button and improved LED status
  • Increased wiring space with a newly added ¾-inch conduit knockout
  • Patented sampling tube installs from front or back of the detector with no tools required

2 Reviews

  • 5
    SYSTEM-SENSOR-D4120W

    Posted by 174947 on Sep 7th 2021

  • 5
    SYSTEM-SENSOR-D4120W

    Posted by 74478 on Sep 10th 2014

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