Q3. My flame sensor detects a flame without a flame present. At my desk it was reading

values below 20, in my classroom students read value up to 800 without a flame present.

A. The range of Spectral Bandwidth of the sensor is: 760nm to 1100nm, so it would detect any 

light whose Spectral Bandwidth is within 760‐1100nm. After test, we found it can be effected 

not only by flame, but also by infrared radiation (Analog read: 900), neon lamps in classrooms 

(Thanks to Richard) and it can even be effected by phone's flash (Analog read: 50). Generally, in 

our office, it outputs 0V (analog read: around 10). This can be found in its datasheet. 

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