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Conventional Automatic Detectors
1.3
Configuration of the Detector
1
Figure 1.3: Detector front panel with sensors
Figure 1.4: Side view of detector cover
Position Description
1
2
3
4
1.4
Functional Description of the Sensor Technology
Optical sensor (smoke sensor)
The optical sensor (refer to Configuration of the Detector (1)) operates according to the
scattered light principle.
The LEDs (refer to Configuration of the Detector (3)) transmit light at a defined angle into the
measuring area (refer to Configuration of the Detector (7)). In case of fire, the light is
scattered by the smoke particles and strikes the photo diodes (refer to Configuration of the
Detector (2)), which transform the quantity of light into a proportional electrical signal.
The effects of daylight and commercial lighting sources are filtered out with an optical daylight
filter and by the use of electronic filtering and phase-locked rectification (ambient light
stability: dazzling test EN 54‑7).
The various light-emitting and photo diodes of the detector are individually activated.
Consequently, signal combinations are produced that are independent of each other and
ideally suitable for the detection of smoke, which makes it possible to differentiate between
smoke and interference agents (insects, objects). In addition, the time characteristics and the
correlation of the optical sensor signals for the fire or interference detection are evaluated.
Moreover, plausibility checking of the various signals makes it possible to detect errors in the
evaluation electronics and the LEDs.
Bosch Sicherheitssysteme GmbH
4
3
2
5
6
2
3
2
7
Optical sensor
Receiver (photo diodes)
Transmitter (LEDs)
CO sensor (only OC-variants)
1
3
Position
5
6
7
Operation Guide
Product Description | en
Description
Two-color LED:
red = alarm
green = test mode/trouble
Pollution sensor
Measuring area
2019.11 | 5.0 | F.01U.003.962
7
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