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The flame detectors are used for the supervision of
gas flames, yellow- or blue-burning oil flames and for ignition
spark proving.
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With this type of flame supervision, the UV radiation
emitted by gas or oil flames is used to generate the flame
signal.
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The radiation detector consists of a UV-sensitive
cell with 2 electrodes, which ignite when illuminated with
radiation in the 190...270 nm range of the spectrum, thereby
triggering a current in the flame detector circuit.
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The UV cell does not respond to glowing firebrick in
the combustion chamber, daylight or light from the boiler room
illumination.
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