| 摘要 |
PURPOSE:To prevent gas explosion by detecting fuel gas flow and indicating existance of gas flow. CONSTITUTION:By adjusting a resistance 12, a bridge circuit is kept equilibrium and output voltage E1 is set at 0. Corresponding to the flow rate of H2, resistance 9 changes and so does E1. E is amplified 14 and compared 15 with reference voltage E2, and when the gas flow is over a certain rate, a lamp 17 is lighted by a driving circuit 16 to indicate gas supply. And at the same time, by setting a heat sensor to a mixer part, it is possible to check burning and also close the gas valve when accidental fire is caused. Thus, gas explosion caused by forgetting to close the gas valve and a burn caused by touching the torch can be prevented. |
