advertisement
DISCOVERY PRODUCT GUIDE
5
Optical Smoke Detector
5.1
Operating Principles:
The Discovery Optical Detector has a white moulded polycarbonate case with wind-resistant smoke inlets. The indicator LEDs are colourless when the detector is in quiescent state and red in alarm.
Within the case is a printed circuit board which, on one side, has the light-proof chamber with integral gauze surrounding the optical measuring system and, on the other, the signal processing and communications electronics.
An infra-red light emitting diode within its collimator is arranged at an obtuse angle to the photo-diode. The photo-diode has an integral daylight-blocking filter. The IR LED emits a burst of collimated light every second. In clear air the photodiode receives no light directly from the IR LED, because of the angular arrangement and the chamber baffles. When smoke enters the chamber it scatters light from the emitter IR
LED onto the photo-diode in an amount related to the smoke characteristics and density. The photodiode signal is processed to provide an analogue value for transmission when the detector is interrogated.
Mode Alarm threshold %/m dB/m Minimum time to alarm
(sec)
1
2
3
4
5
1.4
1.4
2.1
2.1
2.4
0.06
0.06
0.09
0.09
0.11
5
30
5
30
5
Table 1 – Optical Detector Operating Modes (rates comply with EN54-7: 2000)
Figure 2 - Top Section - Discovery Optical Smoke Detector
5.2 Product Codes
Product Description
Discovery Optical Smoke Detector
EN54-7
58000-600AMP
AS7240-7
4106-2005
5
MAN3038-2
advertisement