| 摘要 |
<p>PURPOSE:To notify, an operator surely when the flame of a burner went off and resultantly the gas supply was stopped. CONSTITUTION:Time relation between the non-burning signal from a flame sensor 27 of a burner 13 and the valve closure signal from closing valves 18, 19 is checked with a timing detection circuit provided in a gas control circuit 15. When the arrival of the non-burning signal precedes that of the valve closure signal, it is indicated on a CRT 32.</p> |
