| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively provide a residual amt. detection apparatus preventing the effect of electrolysis or the like on a liquid even if an electrode is utilized. SOLUTION: A residual amt. detection apparatus is constituted so that voltage is applied across a pair of the electrodes 1, 2 arranged in a tank and electric resistance receiving the effect of the liquid present between the electrodes 1, 2 to change is detected to detect the residual amt. of the liquid in the tank. In this case, at a time of non-detection, reference voltage of predetermined potential is applied across both electrodes 1, 2 and, at a time of detection, the potential of one of a pair of the electrodes 1, 2 is alternately changed across reference voltage. |
