Bosch AVENAR 4000 FAH-425-T-R, Руководство по эксплуатации

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System Overview
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Figure 2.1: Detector set-up
1 Smoke measurement chamber with
optical sensor
4 Individual display
2 Thermal sensor 5 PC board with evaluation electronics
3 Chemical sensor (covered on the cross-
section)
6 MS 400 / MS 400 B Detector Base
Functional Description of the Sensor Technology
Optical Sensor (Smoke Detector)
This optical sensor utilizes the scattered-light method.
An LED sends light into the measuring chamber, where it is absorbed by the labyrinth
structure. In the event of a fire, smoke enters the measuring chamber. The light is scattered by
the smoke particles and hits the photo diodes, which transform the quantity of light into a
proportional electrical signal.
The DO detectors have a dual optical sensor that uses the different infrared and blue light
wavelengths (Dual Ray technology). This allows fires to be detected early and even the
smallest quantities of smoke (TF1, TF9) to be reliably detected.
Notice!
The FAP-425-DO-R smoke detector makes an alarm decision based on an intelligent
combination of the following criteria:
Amount of smoke density measured
Speed of smoke density increase
Size of smoke particles (as measured by Dual Ray technology)
Thermal Sensor (Heat Detector)
A thermistor in a resistance network is used as a thermal sensor; an analog-digital converter
measures the temperature-dependent voltage at regular intervals.
Depending on the specified detector class, the thermal sensor triggers the alarm status when
the maximum temperature of 54 °C or 69 °C is exceeded (thermal maximum), or if the
temperature rises by a defined amount within a specified time (thermal differential).
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AVENAR detector 4000 System Overview | en 5
Bosch Sicherheitssysteme GmbH Operation Guide 2014.11 | 1.1 | F.01U.283.550