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7 .13 Flame control
7 .13 .1 With ionization sensor
The IFD generates an alternating voltage (230 V AC)
between the sensing electrode and burner ground. The
flame rectifies this voltage. Only the DC signal (> 2 µA)
is recognized by the automatic burner control unit as a
flame.
A flame cannot be simulated by a short-circuit.
Ignition and monitoring with a single electrode are pos-
sible, see page 10 (Connection diagrams).
7 .13 .2 With UV sensor UVS
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
rectifies the supplied alternating voltage. As with ioni-
zation control, the automatic burner control unit only
detects this DC signal.
In the case of flame control with the UV sensor UVS,
only intermittent operation is allowed (a flame simula-
tion check must be carried out once every 24 hours).
IFD 258 · Edition 03.12l
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7 .14 Flame signal switch-off threshold
The switch-off threshold can be set between 2 and 20
µA using a potentiometer in the upper section of the
housing. The automatic burner control unit IFD is set to
2 µA at the factory.
If a flame is detected during the burner start,
es on the display to indicate a fault.
7 .15 Commissioning
The IFD retains its switch position (On/Off) when the
voltage is removed from terminal 1.
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