Determining signal representative of gas burner air ratio involves applying rectangular wave voltage to electrodes and using instantaneous ionization signal if greater than threshold

摘要

Method involves using an ionization current between two electrodes that are mutually electrically isolated and enclose at least part of flame during operation of the burner. Rectangular wave voltage is applied to electrodes, the instantaneous value of the ionization signal is determined and compared with a threshold value and used as the representative signal if greater than the threshold value.