A sensor (20) includes a single capacitor (30) that operates in two different modes to obtain capacitance and conductance information when a mixture flows between the electrodes (32, 34) of the capacitor. Two different oscillators (180, 182) are selectively used to obtain the conductance and capacitance...http://www.google.de/patents/US7170303?utm_source=gb-gplus-sharePatent US7170303 - Fuel sensor
