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) |