Remaining liquid quantity detecting device

摘要

A remaining liquid quantity detecting device to detect the quantity of the liquid remaining in a tank by applying a voltage to a pair of electrodes 1 and 2 set in the tank and detecting the electric resistance which will change under the influence of the liquid existing between the electrodes 1 and 2, wherein a standard voltage 10 having a predetermined electric potential is applied to both of the electrodes 1 and 2 at a non-detection time, and one electric potential between the electrodes 1 and 2 is changed so as to alternate on the basis of the standard voltage.