Bosch Security D282A‑DH Replacement Duct Smoke Detector Head (24 VDC)

The D282A‑DH Replacement Duct Smoke Detector Head detects the large smoke particles which typically result from wood, paper, and fabric combustion. It is a conventional 24 VDC photoelectric smoke detector head for use with the D300A and D300A‑HV conventional duct detector housing units. It uses an infrared (IR) LED light source and a silicon photo diode to measure light reflected from particulates in a detection chamber. After two consecutive measurements exceeding the threshold level, the unit signals an alarm condition. The detection chamber, designed for reliable smoke entry characteristics, is protected by a micro-fine insect screen to minimize nuisance alarms. The sensitivity stability and high signal‑to‑noise ratio of this detector permits its use in a wide range of environmental conditions. The detector head has a moisture‑proof reed switch that reacts to an external magnet for testing. The magnet test simulates a 4% to 6% smoke obscuration, which places the detector in an alarm condition. This test is especially useful in environmentally unstable or clean areas. There are built‑in LEDs that flash to indicate the unit is powered. The LEDs latch on steady in an alarm condition.


Also known as: BOS-D282ADH, D282ADH

Technical Specifications: Operating Voltage: 15.0 VDC to 33.0 VDC Surge Current: 0.16 mA Standby Current: 0.045 mA Alarm Current: Depends on housing; refer to the D300A or D300A‑HV specifications Dimensions (diameter): 4 in. (10.2 cm) Color: Bone white Temperature (operating): +32°F to +120°F (0°C to +49°C) Relative Humidity: 10% to 85% non‑condensing

For more information about the Bosch Security D282A-DH, please contact us.