| 摘要 |
PURPOSE:To obtain an improved mass-production effect and achieve a cost reduction by an arrangement wherein a single control circuit possesses functions of detecting the presence of flame, giving an alarm when an abnormal combustion occurs or generating a combustion interrupting signal as an output or controlling or keeping the excess air rate for flame constant. CONSTITUTION:Thie control circuit is comprised of a state detection circuit 6 adapted to convert the signal received from a sensor 4 adapted to detect the flame or fuel burning condition into an electrical guantity which corresponds to the burning condition, a burning signal outputting circuit 7 adapted to detect the presence of flame by the output of the state detection circuit 6 and output a signal, and a signal processing circuit 8 arranged to convert or process output signal generated by the state detection circuit 6. This signal processing circuit 8 includes an alarm generating unit 9 adapted to give an alarm when an abnormal combustion occurs, and a combustion interrupting unit 10 adapted to output a signal to interrupt combustion to a combustion interrupting circuit 12. |
