| 摘要 |
PURPOSE:To permit the visual confirmation of ignition by an operator indirectly while standing up, by a method wherein the ignition is informed of by indication when the thermal electromotive force of a thermocouple provided in a combustion unit has become a given value or higher, thereafter, the indication is extinguished when a given time has elapsed. CONSTITUTION:When there is no thermal electromotive force in a thermocouple T, the output of a comparator 34 shows H-level by resistors 8, 9, 10. However, when the thermal electromotive force of a given value or higher is generated, the plus input voltage of the comparator 34 is reduced and the output of the same is converted into L-level. Accordingly, transistors 27, 31, 30 are operated and a LED 32 is lighted. The transistors 26, 29 are operated simultaneously with the lighting of the LED 32, therefore, the discharge of a charge from a capacitor 35 is started. When the voltage of the capacitor 35 has become lower than a voltage, set by the resistors 10, 20, (after a given time (t)), the output of the comparator 33 shows H-level and the LED 32 is put OFF. |
