| 摘要 |
PURPOSE:To sufficiently achieve an anticorrosive function of a boiler and a waterless burning preventive function thereof by applying an AC voltage to a pair of water level detecting electrodes electrically insulated from the boiler body and an anticorrosive electrode. CONSTITUTION:An anticorrosive electrode 2 and a pair of water level detecting electrodes 10a, 10b are electrically insulated through an insulator 19 from a boiler body 1, and the electrode 2 is connected to an anticorrosive power supply 3 connected through a rectifier circuit 4 to a step-down circuit 20. A waterless burning detecting circuit 13 is connected to the electrodes 10a, 10b, an AC voltage is applied to the electrodes, and a waterless burning detecting circuit 13 feeds a signal to a combustion control circuit 5. The corrosive voltage can be set in an optimum range without adverse effect of the AC voltage. |
