Structure and function
22
Building Technologies 007004_k_en_--
Fire Safety & Security Products 16.04.2009
3.3 Detectors
3.3.1 Neural fire detector
The neural fire detector is a multiple criteria fire detector and is equipped with two
optical and two thermal sensors. The following neural fire detectors are available:
z FDOOT241-9
z FDOOT241-8
z FDOOT221
The following table shows the most important differences between the neural fire
detectors.
Parameter FDOOT241-9 FDOOT241-8 FDOOT221
Signal processing ASAtechnology ASAtechnology Detection algorithms
Communication protocol z FDnet
z Collective
z FDnet
z MS8
z FDnet
Structure and function
1 2
3
4
1 Heat sensors 3 Forward scatterer
2 Backward scatterer 4 Labyrinth
The detector has a sophisticated opto-electronic measuring chamber with two
optical emitters, an optical receiver and two thermal sensors.
The transmitters illuminate the smoke particles from different angles. One sensor
acts as forward scatterer, the other as backward scatterer. The scattered light then
hits the receiver (photodiode) and generates a measurable electric signal.
The combination of a forward and backward scatterer facilitates an optimum
detection and the differentiation of light and dark particles, which leads to a
homogenous response behavior and optimizes the differentiation of wanted signals
and deceptive phenomena.
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