Patent ID: 7382140
Filing Date: 2008-06-03
Classification: F23N

Abstract:
1. A flame monitoring device, comprising: a control unit; a reference voltage source supplying a reference voltage; and a capacitor connected to a reference voltage source via a switch, charged by the reference voltage during a charging phase, and discharged during a discharge phase via a coupling element connected to a flame sensor; wherein the switch which is closed during the charging phase and opened for the discharging phase, is under control of the control unit, wherein a duration of the charging phase or the discharging phase is determined by the control unit based on an impedance of the flame sensor, and that, when initiated by the control unit for flame monitoring wherein the charging or discharging of the capacitor is repeated cyclically, a voltage signal is obtained at the capacitor, and the voltage signal is evaluated in a single-channel mode using a threshold value.