Flame Monitoring And Ionisation Current Check - Bentone BG 550-2 Installation And Maintenance Instruction

6.5 Flame monitoring and ionisation
current check
The standard version of the burner is monitored according to the ionisation
principle. The ionisation current should be checked on initial start-up and at
each service visit.
Ionisation current is measured using a micro ammeter (µA) connected in series
with the ionisation electrode and gas burner control. Connect the µ ammeter
according to the diagram. The minimum required ionisation current is shown in
the table. In practice, this current must be significantly higher, preferably more
than 10 µA. Connection of the µA instrument is made easier by the fact that all
gas burners are equipped with a divisible ionisation cable.
The reason for low ionisation current can be leakage current, poor connection
to earth, fouling or incorrectly positioned ionisation electrode in the combustion
head. Occasionally, an incorrect gas/air mix may result in poor ionisation current.
Technical data
For continuous operation!
Idle voltage at ION-terminals
!
Protect the ionisation electrode from electric
shock!
Short-circuit current
Min. current for flame detection
Required current to ensure detection
Possible detection current
Operational indicator lamp flashes green
Operational indicator lamp shines green
6.5.1 Flame monitoring ionisation
34
Bentone
AC 115-230V
Max. AC 100-300 mA
Min. DC 1.5 µA
Min. DC 3 µA
Max. DC 20 µA
<5 µA DC
>5 µA DC
172 615 02-2