template image(0) Item / $0
8:00 AM - 5:00 PM EST (Monday-Friday) |Hi Guest, Login! |
System Sensor 2D51, Low-Profile, 4-Wire Plug-In Detector for Special Applications
Base not included

System Sensor 2D51, Low-Profile, 4-Wire Plug-In Detector for Special Applications

Manufacturer:System Sensor
Manufacturer Part#:2D51
Our Part#:2D51
Stock Status: Call for Availability
Retail Price:$111.59
Your Savings:$33.48(30%)
Your Price:$78.11


System Sensor







Feature 5


Feature 7

Product Type:Duct Detector|Input Voltage:24VDC,120VAC,Other|Detection Type:Photoelectric|Connection Type:Hardwired,System|Intended Use:Commercial/Industrial|Interconnect:No

Features for 2D51/B210LP/D4P120

  • Low-profile smoke detector design
  • Low standby current
  • Two LEDs blink in standby
  • Detector head plugs easily into base
  • Built-in test switch
  • Field sensitivity metering of detector to meet the requirements of NFPA 72 with the use of RTS2/RTS2-AOS and SENS-RDR
  • Designed for mounting on a standard electrical box
  • SEMS screws for easy wiring and positive wire retention
  • Removable cover and insect screen for field cleaning
  • Remote push button Test/Reset, LEDs provide visual indications
  • Onboard supervisory and alarm relays
  • Accepts 24 or 120V supply voltage
  • Interconnect up to 100 units for common functions
  • Compatible for interconnection with System Sensor InnoviarFlex™ D4120 or D4120W duct smoke detectors and remote accessories


The 2D51 is the HEAD ONLY. The following are compatible with the 2D51:
  • B210LP Base
  • D4P120 4-Wire P/E Power Board
  • RTS151 Remote Test Station
  • RTS151KEY Same as Above, with Key Lock
  • APA151 Remote Annunciator with Piezo alarm
  • RTS2-AOL Multi-signaling accessory
  • RA100Z Remote Annunciator alarm LED
  • MHW mini horn
  • AOS - add-on strobe

The 2D51 can be used as a pendant mount detector in no-flow/low-flow air-handling systems (0-4,000 FPM). The pendant /plenum mounted 2D51 is to be installed into a B210LP base and wired to a D4P120 power board-only control unit. The D4P120 power board is capable of controlling up to two 2D51 sensors.

Pendant mounted in a standard electrical box within the duct, the twist-in/twist-out head allows easy removal from the base for quick cleaning and maintenance. The 2D51 heads can be locally tested using a magnet or by using the test/reset push button on the D4P120 power board.

Remote testing is accomplished using the RTS151, RTS151KEY, RTS-2 or RTS-AOS accessories connected to the D4P120 power board.

The APA151, RTS2 and RTS2-AOS Remote Annunciators with Piezo Alarm can also be connected to the D4P120 power board to provide an audible and visible indication of smoke detector status.


Operating Temperature Range: -4°F to 158°F (-20°C to 70°C)
Operating Humidity Range: 10% to 95% non-condensing
Air Duct Velocity: 0 to 4000 fpm
Dimensions: 2.00"H x 4.1" Diameter
Shipping Weight: 3.1 oz. (88 g)
Voltage Range: See B210LP base specifications
Alarm Current: See base specifications
Accessories designed for use with this product - To add any of these accessories to your order, simply fill in the quantity you want and click the large "Add to Cart" button above
System Sensor APA151, Piezo Annunciator
Average Rating(0)
Call for Availability
System Sensor MHW, 12/24VDC Mini Horn, White
Average Rating(0)
Call for Availability
System Sensor RTS151 Remote Test Station
Average Rating(0)
Call for Availability
System Sensor RTS151-KEY Remote Test Station with Key
Average Rating(0)
System Sensor
System Sensor RTS2-AOS Multi-Signal Accessory Test Station w/Strobe
Average Rating(0)
Call for Availability

You May Also Like...


Recently Viewed Items