Siemens FDL241-9 - About this document

2 Structure and function
2.1 Overview
The linear smoke detector FDL241‑9 detects fires according to the principle of light
attenuation by smoke. The linear smoke detector works together with a reflector,
which is installed opposite the detector.
Properties
● Communication via FDnet/C-NET detector line or collective detector line
● Signal processing with ASAtechnology (ASA = Advanced Signal Analysis)
● Detection distance 5…100m
1
● Three sensitivity levels
1
The detection distance of 10…100m meets the requirements of standard
EN54‑12.
In accordance with EN62471, 'Photobiological Safety of Lamps and Lamp
Systems', the linear smoke detector falls into the 'Exempt Group'.
2.2 Function
The linear smoke detector smoke detector consists of a transmitter and a receiver
and works according to the principle of light attenuation by smoke. The transmitter
transmits to the reflector a highly focused, pulse-shaped infrared ray. If no smoke
is present, a large part of the infrared ray reaches the reflector and is returned to
the receiver. The incoming light generates an electric signal on the receiver's photo
diode.
E
S
1 2
3
Figure 1: Function of the linear smoke detector without smoke
1 Detector E Receiver
2 Reflector S Transmitter
3 Measuring section 5…100m
1
1
The detection distance of 10…100m meets the requirements of standard
EN54‑12.
Structure and function
Overview
2
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