Electrical Connection Of Flame Detectors - Siemens LME7 Series Manual

Building Technologies
1.4

Electrical connection of flame detectors

It is important to achieve practically disturbance- and loss-free signal transmission:
∂
Never run the detector cable together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable
∂
Observe the permissible detector cable lengths (see Technical Data)
∂
The mains-powered ionization probe is not protected against electric shock hazard.
Protection against accidental contact must be ensured
∂
Locate the ignition electrode and the ionization probe such that the ignition spark
cannot arc over to the ionization probe (risk of electrical overloads) and that it
cannot adversely affect the supervision of ionization
∂
Insulation resistance
– Must be a minimum of 50 Mς between ionization probe and ground
– Soiled detector holders reduce the insulation resistance, thus supporting
creepage currents
∂
Earth the burner in compliance with the relevant regulations; earthing the boiler
alone does not suffice
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CC1P7105enr
17.04.2018