Structure Of The Radio Smoke Detector Dow1171 - Siemens FDCW221 Technical Manual

Structure and function
3

Structure of the radio smoke detector DOW1171

3.2 Structure of the radio smoke detector DOW1171
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Building Technologies
Fire Safety
Radio smoke detector DOW1171 with base DBW1171
1 DBW1171 base
The radio smoke detector DOW1171 works in line with the scattered light principle.
An infrared LED sends short, intense light pulses to the scattering volume. The
orifices shield the light receiver from direct rays of light and reflexes. Penetrating
smoke particles scatter the light on the light receiver. The signal of the light
receiver is evaluated by the electronics.
Algorithms evaluate the smoke density and the probabilities of alarms are
forwarded by the microprocessor.
5
Cross-section through a radio smoke detector DOW1171
1 Light source (infrared LED)
2 Labyrinth
3 Orifice
2 DOW1171 radio smoke detector
1
2
3
4
4 Light receivers
5 Smoke particle
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2015-11-06