A sensor system for sensing liquid level in a bilge, for use in automatic bilge pump actuation. First and second field effect sensors are potted or sealed within a container or the bilge wall and are aligned in a vertical array and each comprise a substantially planar pattern of “electrodes” or conductive...http://www.google.es/patents/US8024967?utm_source=gb-gplus-sharePatente US8024967 - Solid state fluid level sensor
