| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve prompt detection of accidental fire in a system which detects accidental fire of a burner by an electric potential of charging/discharging.SOLUTION: An output terminal outputs an electric potential of a capacitor or an electric potential having correlation with the electric potential of the capacitor. A voltage limiter applies a voltage between a flame rod and a burner by limiting a maximum value of the electric potential of the output terminal. It is possible to determine presence/absence of flame by detecting a flowing current by making use of ions generating in the flame. By including a voltage limiting unit, prompt detection of accidental fire without depending on a burning state is possible.</p> |
