Well, seems reasonable to me that the max pressure drop will occur at the maximum rated flow (I'd assume that the meter is only calibrated to read to a certain value). Given that it's a "variable area" flow meter, I would assume it's some sort of a constriction (i.e. a Venturi Meter) that uses two pressure readings and the energy equation to solve for flow.
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Michael E. Robbins
M.A.Sc. Candidate, University of Toronto
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