The invention relates to micro fuel cell systems whose performance is
enhanced by an accurate fluid delivery system. The fluid delivery system
improves reactant fluid provision to meet electrical output, while
maintaining correct stoichiometries for chemical processing in a
downstream reactor. The fluid delivery system includes a pressure source
and a differential flow meter. The differential flow meter uses a flow
restrictor and a sensor. The pressure source moves a fluid through the
flow restrictor; the sensor detects differential pressure in the flow
restrictor and outputs a signal that permits dynamic control of fluid
flow, e.g., by controlling a pump.