D285DH Duct smoke head, 2-/4-wire, 12/24V

D285DH Duct smoke head, 2-/4-wire, 12/24V

  • Commercial or residential applications
  • Two-wire or four-wire application, depending on base
  • Chamber Check rapid-flash LED Automatic Trouble Indication reports contaminated chamber
  • Flashing LED power indicator
  • Steady-On LED alarm indicator
  • Modular design

The D285DH duct detector head detects the large smoke particles which typically result from wood, paper, and fabric combustion. The detector is part of a two component system: the duct detector housing and the duct detector head. The housing is permanently attached on the duct.

 
RMS Ripple (maximum) 25% of DC input
Voltage (input) Two-wire: 8.5 VDC to 33 VDC Four-wire: 10 VDC to 30 VDC
Current  
Alarm Two-wire: depends on control panel which must limit the alarm current to 100 mA maximum Four-wire: depends on detector base, refer to pertinent base specifications
Standby Two-wire: 0.08 mA at 12 VDC, 0.09 mA at 24 VDC Four-wire: 24 mA at 12 VDC or 24 VDC
   
Relative Humidity: Up to 93%, non-condensing
Temperature (operating): +32°F to +100°F (0°C to +38°C)
Radio Frequency Interference (RFI) Immunity: No alarm or lockup on critical frequencies in the range from 26 MHz to 950 MHz at field strengths less than 50 V/m
   
Color: Bone white
Dimensions (diameter x D): 4 in. x 1.25 in. (10.2 cm x 3.2 cm)