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Flame control
7 Flame control ...
7 .1 . . . w ith flame rod
The BCU generates an alternating voltage (230 V AC)
between the sensing electrode and burner ground. The
flame rectifies this voltage. Only the DC signal (> 1 μA) is
detected by the burner control unit.
A flame cannot be simulated.
Ignition and monitoring with a single electrode are pos-
sible if an external ignition transformer is used.
The requirements for continuous operation are satisfied
in the event of flame control using a flame rod.
7 .2 . . . w ith UV sensor
A UV tube inside the UV sensor detects the ultraviolet
light of a flame. It does not respond to sunlight, incan-
descent bulb light or infrared radiation emitted by hot
workpieces or red-hot furnace walls.
In the event of incident UV radiation, the UV sensor rec-
tifies the supplied alternating voltage. As with ioniza-
tion control, the burner control unit only detects this DC
signal.
When using UV sensors of Type UVS, the burner control
unit may be used for intermittent operation only. This
means that operation must be interrupted at least once
every 24 hours. This can be programmed using param-
eter 17 = 1.
BCU 370 · Edition 01.19
Further information can be found in Technical Informa-
tion bulletins UVS 5 and UVS 10 at www.docuthek.com.
The burner control unit BCU..U1 is prepared for UV
flame detector UVC 1. This enables continuous opera-
tion.
Further information can be found in TI UVC at
www.docuthek.com.
70
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