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What is the difference between a Rotameter and a Flowmeter?
All rotameters are flowmeters, but not all flowmeters are rotameters.
A rotameter measures flow rate in a closed tube - characterized by a tapered tube and some sort of float (typically a sphere). By definition, "rotameters" exclude any type of flow measurement device that does not employ a tube and float. Ironically, the element called the "float" does not actually float on the fluid being measured.
A flowmeter, broadly defined, is any device that measures flow, and therefore includes all rotameters, plus any other devices designed for the task of measuring flow.
For Rotameter Operation Instructions, Rotameter Calibration Information, and other useful information:
