| 摘要 |
PURPOSE:To prevent the incorrect signal by acting safely even at unusual conditions by stopping the transmission of pulse when the flame electric current is not inputted as a smooth signal into a comparator. CONSTITUTION:In the pulse check system capable of finding out the failure of a comparator, the high level phase of standard electric potential by pulse signal is adjusted to the half wave signal generating time by the rectifying action of flame with synchronizing the period of power source joining in the detecting part of the fire flame electric current and the period of the check pulse. That is, a pulse signal generating part 6 operates the transistor 10 for the switching by the same period as the alternating power source 2 impressed to the flame rod 1. Together with adding the voltage to the flame rod 1 through the capacity 19 the electric current and voltage changing part 5 of the flame electric current is connected with the flame rod 1 in parallel through a resistance 20. By this, no electric voltage joins in the changing part of electric current and voltage and no incorrect action occurs. |
