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The official Dwyer Instruments, Inc. site to investigate, learn, and buy online pressure, flow, level, and temperature, gas sensing, and air velocity instrumentations and controls. Mar 16, 2018 · Working principle of rotameters For the advantages listed above, the rotameter is the most widely-used variable-area flowmeter. It consists of a tapered tube; as fluid passes through that tube, it raises the float. This is the “non-recoverable” pressure drop of the meter that requires energy, e.g., compressor work, to overcome and increases the cost of plant operation. The non-recoverable pressure losses for three important head meters are given in Figure 5.