| 摘要 |
PURPOSE:To supply a heat-transmitting medium easily and safely, by a method wherein a detecting electrode and a detecting circuit for a heat-transmitting medium are provided in each of a shell body and an auxiliary tank, in a boiler provided with a shell body and an auxiliary tank for replenishing a heat-transmitting medium when the amount of the medium in the shell body is reduced due to evaporation or the like. CONSTITUTION:In a boiler, the heat-transmitting medium in a shell body 1 is heated by a burner 3, and the medium thus heated is fed into a hot water type heat exchanger or the like by a circulating pump 4. When the amount of the medium in the shell body 1 is reduced, the medium in the auxiliary tank 2 is sucked into the shell body 1 by a pressure difference generated between the shell body 1 and the tank 2. In this case, the electrodes 5, 6 for detecting the medium in the shell body 1 and the tank 2 are provided. In replenishing the medium, when the level of the medium in the tank 2 is lowered to or below a set level of the electrode 6, operations of the pump 4 and the burner 3 are stopped, and the tank 2 is replenished with the medium. When the amount of the medium in the shell body 1 is reduced to or below a set level of the electrode 5, the condition is recognized as a breakage of the shell body or the like, and the operations are similarly stopped. |
