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10.2 Flame detector FDF241-9
10.2.1 Functions
The flame detector measures infrared radiation and can therefore detect liquid and
gas fires without smoke and organic material fires with smoke. It has three sensors
with ASA
technology
and can distinguish between deceptive phenomena and real
fires.
● Pyroelectric sensor A measures the infrared radiation in the characteristic CO
2
spectral range between 4.0 and 4.8 µm.
● Pyroelectric sensor B measures the infrared radiation of deceptive phenomena,
such as hot objects, in the range between 5.1 and 6.0 µm.
● Sensor C is a silicon photo diode and measures solar radiation in the range
between 0.7 and 1.1 µm.
● A sensor measures the hot CO
2
at a specific wavelength of the flame; the other
two sensors measure interference radiation at other wavelengths at the same
time.
● With the intelligent signal processing using fuzzy algorithms and wavelet
analysis, the flame detector achieves excellent detection reliability with
maximum immunity to interference emitters and sunlight at the same time.
● In order to safeguard against a possible decision emergency, the flame
detector contains an additional emergency activation channel.
Signal
+
Time
Wavelet
Fuzzy wavelet
Fuzzy logic
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