A flange arrangement for a fuel module comprising a non-conductive flange member to connect the fuel module to a fuel tank includes tube posts that each connect to a conductive support tube, a conductive web in conductive contact with the support tubes and a conductive fuel supply port in conductive contact with the web. A packet monitoring system includes an input port for receiving network packets, a sampling element for selecting a fraction of those packets for review, and a queue of selected packets. In one embodiment, the ion jet streams are heated and the respective temperatures of the detectors are measured. A flow rate is calculated based on the detected pressure difference. The dome closes the upper end of the sleeve.