37
Flame monitoring and measurement of ionisation current
Flame monitoring and measurement of ionisation current
The burner is monitored according to the ionisation principle. Check the
ionisation current on start-up and on each service call.
The reason for a low ionisation current may be leaking currents, bad
connection to earth, dirt or a faulty position of the fl ame electrode in the
burner head. Sometimes also a faulty gas/air mixture may cause too weak
a ionisation current.
The ionisation current is measured by means of a microampere meter (µA)
connected in series with the fl ame electrode and the gas burner control.
Connect the µA-meter, see fi gure. Min. required ionisation current accor-
ding to table. In practice this current must be considerably higher, prefe-
rably more than 10 µA. All the gas burners are equipped with a ionisation
cable that can be slit which facilitates the connection of the µA-device.
GENERAL INSTRUCTION
Flame monitoring
Gas control
Connection to terminal
in gas control
Min. ionisation
current required
LME
1
5 µ A
LGB
1
10 µ A
LFL
24
10 µ A
MMI 810
2
5 µ A
TMG 740-3
1
5 µ A
Summary of Contents for BG 550 LN
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