| 摘要 |
PURPOSE:To improve a safety and reliability of the combustion device when the non-combustion gas is produced by a method wherein a ventilater means is operated by a voltage comparater which is operated with a low level of variation in resistance in a non-combustion gas sensor and a extinguishing means is operated by a voltage comparater which is operated with a high level of the variation in resistance. CONSTITUTION:When an incomplete combustion is progressed and non-combustion gas is produced, a resistance value in the gas sensor 25 is decreased. Thereby, non-reversing input voltage of the operation amplifier 40 and non-reversing input voltage of the operation amplifier 48 are decreased. In this case, since the non-reversing input of the operation amplifier 48 is set to a higher voltage than the reversing input voltage of the operation amplifier 40, at first the output of the operation amplifier 48 is made high and the ventilation fan 52 is rotated through transistor 49 and a relay coil 50. Further, when a resistance in the gas sensor 25 is due to a lack of oxygen, an output of the operation amplifier 40 is decreased, the transistors 44, 45 are turned OFF, and a solenoid 6 is energized, a wick is lowered and the combustion unit is extinguished and finally entire electric circuit is turned OFF. |
