A cyclonic separator separates contaminants from liquid fuel. According to the invention, the means of thermal conduction includes multiple thermal conduction elements each defining internally a void which extends lengthways in a direction of conduction which runs from the interior wall towards the exterior wall. The dummy electrode is located so that a space between the top electrode of the capacitor element ad the dummy top electrode is in a predetermined range. On the semiconductor layer 12, a second electrode 14 is formed. A dedicated, specifically adapted search and filter program is employed to list or enumerate retrieved data records. Upon creation of the cluster, volume location databases negotiate ranges for data set identifiers between a first site and a second site of the cluster.