| 摘要 |
An improved method- for flame sensing in a solid, liquid or gaseous fuel burner, said flame being generated at an ionization electrode (1), the flame presence resulting in an ionising effect on said electrode (1), said electrode being powered by an alternating voltage signal, the ionization phenomenon generating in the electrode a direct current, said current being sensed by a suitable sensing circuit (3) comprising a control unit (7), this signal generator being of relatively low internal impedance to enable the measured generated current to have a high value compared with that normally used and of waveform such as to tend to limit the value of the direct current flowing through the electrode (1), said sensing and control circuit being such as to enable the presence of a parasitic current (10) on the flame sensing electrode to be measured. A device for implementing said method is also claimed. |
