Pyroelectric sensor A measures the infrared radiation in the characteristic CO2 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 CO2 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.