Capacitive type fuel level and impurity indicator

摘要

A pump located within the fuel tank discharges fuel into a chamber containing a plurality of reference electrodes which determine the dielectric constant of the fuel. The output of a set of measuring electrodes is calibrated using the dielectric constant determined using the reference electrodes. The fluctuations in the capacitance developed by the reference electrodes due to momentary contact with water droplets or the like can be used to indicate an excess of the water or the like in the fuel.