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

5.6 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.
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. 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.
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
34 Bentone
AC 115-230 V
Max. AC 100-300 mA
Min. DC 1.5 µA
Min. DC 3 µA
Max. DC 20 µA
<5 µA DC
>5 µA DC
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