Flame scanners are used to detect whether a flame exists on a boiler
Flame scanners are either
UV
Typically used for fuel gas applications
IR
Typically used for fuel oil/ coal fired applications
Combination of UV/IR
Most accurate
Expensive
Selection of UV/IR depends on the type of ray emitted during combustion process
Flame scanners are typically powered by 24Vdc power supply.
The old type flame scanner will normally come with a split rack panel which can accommodate several flame scanner cards. They are:
Amplifier card
Monitor flames, amplifier card, old technology,
Scanner just detects radiation,
1 amplifier is for 1 scanner
Some amplifiers have the option for 2 flame scanner connectivity to provide redundancy. I.e. 2 flame scanners can be connected to an amplifier card and declared as redundant to each other. A simple PLC logic can exist in the amplifier card
Converts the signal to 4-20mA or relay output if require
Power supply card
Multi voltage, accept both 110VAC, 240VAC and changes it to 24V
Gives a stable voltage since AC currents may effect reading
1 supply card will power multiple 24vdc flame scanners and amplifier cards
Picture below shows a burner and flame scanners
Picture of Flame scanner rack for old technology flame scanner where the amplifier and power supply cards are separate. Picture on right is flame amplifier
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