Patent ID: 8618493
Filing Date: 2013-12-31
Classification: F23N

Abstract:
1. A flame monitor for detecting the presence of a flame, comprising: at least two UV tubes which have substantially the same field of vision, each UV tube having an anode and cathode; a controller that supplies a DC voltage to the UV tubes whereby ionization ignition pulses in each UV tube are detectable in a discharge area of each UV tube; said controller containing circuitry for switching the two UV tubes on and off in succession with a gap of a predefined time within a predetermined interval of time, whereby the UV tubes are switched on for a predeterminable period of time and wherein the anode of each UV tube is connected to earth potential between the operations of switching the UV tubes off and on in order to draw ionization in the discharge area; and means for recording and comparing the number of pulses obtained from each UV tube.