35 Bentone
General
For continuous operation!
No-load voltage at ION terminal
(X10–05 terminal 2)
Approx. UMains
!
Protect the ionization probe against electric shock hazard!
Short-circuit current Max. AC 1 mA
Required detector current Min. DC 4 µA, flame display approx.
30%
Possible detector current Max. DC 16…40 µA, flame display
approx. 100%
Threshold values when flame is supervised by an ionization probe:
- Start prevention (extraneous
light)
Intensity of flame (parameter 954) ≥18%
- Operation Intensity of flame (parameter 954) >24%
Technical data
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.
The reason for low ionisation current can be leakage current, poor
connection to earth, fouling or incorrectly positioned ionisation electrode in
the combustion head. Sometimes the wrong gas-air mixture can also cause
a very poor ionisation current.
The ionisation current is measured with a microampere meter (µA) that is
connected in series with the ionisation electrode and the gas burner control.
Connect the µA meter according to the figure. The minimum required
ionisation current is shown in the table. In practice, this current must be
significantly higher, preferably more than 10µA. The connection of the µA
instrument is made easier by the fact that all gas burners are equipped with
a divisible ionisation cable.
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