34
Bentone
7.8
Control of flame monitoring and ionization
current
The burner is monitored in the standard version according to the ionization
principle. The ionization current must be checked at each service occasion.
The ionization current is measured with a microampermeter (µA) which is
connected in series with the flame electrode and the gas burner control.
Connect the µA meter as shown below. The minimum required ionization
current is shown in the table. During normal operation, this current must be
significantly higher, preferably more than 10 µA.
The reason for too low ionization current can be creep current, poor connection
to earth, dirt or that the flame electrode may need to be adjusted. The wrong
gas/air mix can also cause too low ionization current.
Technical data
Idle voltage at ION-terminals
AC 115-230V
Short-circuit current
Max. AC 100-300 mA
Min. current for flame detection
Min. DC 1.5 µA
Required current to ensure detection
Min. DC 3 µA
Possible detection current
Max. DC 20 µA
Operational indicator lamp flashes green
<5 µA DC
Operational indicator lamp shines green
>5 µA DC
172 615 02-3
7.8.1
Flame monitoring ionisation
Summary of Contents for BG 300-2
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