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Bosch D282A photoelectric smoke detector head radionics
BOSCH D282A Photoelectric Smoke Detector Head RADIONICS Fire Alarm
D282A/D283A Photoelectric Smoke Detector
Easy head removal for cleaning and servicing
Two-wire and four-wire base options
Tamper-resistant locking base
The D282A and D283A detectors detect the large smoke
particles which typically result from wood, paper, and
fabric combustion. The D283A is a smoke detector that
also has a +135 F (+57 C) fixed temperature heat
sensor. Use in areas where the ambient temperature
does not exceed +100 F (+38 C). These detectors are
compatible with 24 VDC circuits.
These detectors have two components: the detector
base and the detector head. The base is permanently
attached and wired to a back box. The interchangeable
heads quickly detach for replacement and cleaning
without affecting circuit wiring.
The D282A and D283A Smoke Detectors use an infrared
(IR) LED light source and a silicon photodiode to
measure light in a chamber. In normal conditions the
light is absorbed in the chamber. The presence of a
significant number of particulates reflects the light to
the photodiode. After two consecutive measurements
exceeding the basic level, the unit signals an alarm
condition. The detector can be reset from the control
panel, after an alarm condition clears, by interrupting
The detection chamber, designed for reliable smoke
entry characteristics, is protected by a micro-fine insect
screen to reduce dust accumulation and insect
penetration and minimize nuisance alarms.
These heads have moisture-proof reed switches that
react to an external magnet for testing. The magnet test
simulates a 4% to 6% smoke obscuration that places the
detector in an alarm condition. This test results in
specific LED and alarm circuit responses indicating the:
detector is within calibration standards
detector settings are outside sensitivity standards
This test is especially useful in environmentally unstable
The D282A and D283A have two built-in bicolor LEDs
Green indicates the device is within calibration
Red indicates the detector is outside its sensitivity
Relative Humidity: Up to 93%, non-condensing
Temperature (operating): +32 F to +100 F (0 C to +38 C)
Material: PC/ABS blend (polycarbonate/polyacrylonitrile butadiene
