RATIOMETRIC CAPACITIVE LIQUID LEVEL SENSOR

摘要

A capacitance liquid level sensor is provided to lengthen service life and reduce malfunction by sensing liquid quantity through capacitance difference between a part sunk in liquid and a part which is not sunk in liquid. A capacitance liquid level sensor comprises: a substrate(10) of a sheet form; a pair of left condenser electrodes(30) and right condenser electrodes(40) being arranged in a plurality of rows at constant intervals; and an plurality of ground electrodes(20) arranged between the row of the right condenser electrode and the left condenser electrode. The length of a pair of left condenser electrode and right condenser electrode is gradually varied in the opposite direction. A plurality of ground electrodes are electrically connected.