33 Bentone
8.8 Control of ame 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 ame 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
signicantly 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 ame 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 ame 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 ashes green <5 µA DC
Operational indicator lamp shines green >5 µA DC
172 615 02-3
8.8.1 Flame monitoring ionisation
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