Electrical Connection Of Flame Detectors - Siemens LMV27.100x2 Basic Documentation

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Building Technologies
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Electrical connection of flame detectors

It is important to achieve practically disturbance- and loss-free signal transmission:

Never run the detector cables together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable

Observe the permissible detector cable lengths

The mains-powered ionization probe is not protected against electric shock hazard.
It must be protected against accidental contact

Earth the burner in compliance with the relevant regulations; earthing the boiler
alone does not suffice

Locate the ignition electrode and the ionization probe such that the ignition spark
cannot arc over to the ionization probe (risk of electrical overloads)

Insulation resistance
- Must be a minimum of 50 M between ionization probe and ground
- Soiled detector holders reduce the insulation resistance, thus supporting
creepage currents
Basic Documentation LMV27...
1 Safety notes
CC1P7541en
17.12.2018