The Bosch D285DH duct detector head detects the large smoke particles which typically result from wood, paper, and fabric combustion. Also, the detector is part of a two component system: the duct detector housing and the duct detector head. Hence, the interchangeable duct detector head quickly detaches for replacement and cleaning without affecting circuit wiring.
The Bosch D285DH uses an infrared LED light source and a silicon photo-diode to measure light in a chamber. Therefore, In normal conditions the light is absorbed in the chamber. Also, the presence of a significant number of particulates allows the light to reflect to the photo-diode.
This head has a moisture-proof reed switch that reacts to an external magnet for testing. The magnet test simulates a 4% to 6% smoke obscurity, which places the detector in an alarm condition.
Features / Specifications
- Commercial or residential applications
- Two-wire or four-wire application, depending on base
- Chamber Check rapid-flash LED sends contaminated chamber reports
- Flashing LED power indicator
- Steady-On LED alarm indicator
- Modular design
- Duct Detector Head