| 摘要 |
PURPOSE:To enable to secure a flame current range for setting up a shortage level of oxygen irrespective of a kind of fuel, by constituting a series closed circuit incorporating the other burner which is influential to the flame current through interference at the time of combustion. CONSTITUTION:A first series closed circuit is formed of a first electric power source 13, a resistance 14 for control of a current, a parallel circuit of a resistance 15 for taking out a flame current signal and a smoothing condenser 16, a resistance 9 and a diode 10. A second series closed circuit is formed of a second electric power source 17, a resistance 18 as a certain impedance element, a circuit part of a condenser 19 for divided transmission of an alternate current, resistances 14, 15 and a condenser 16, a flame equivalent circuit resistance 11 and a diode 12. The flame current signal, which is to decide shortage of oxygen, is taken out from both ends of the resistance 15. |
