Purge Rotameter

Rota meters are the most widely used type of variable-area flow meter. In these devices, the falling and rising action of a float in a tapered tube provides a measure of flow rate Rota meters are known as gravity-type flow meters because they are based on the opposition between the downward force of gravity and the upward force of the flowing fluid. When the flow is constant, the float stays in one position that can be related to the volumetric flow rate. That position is indicated on a graduated scale. Note that to keep the full force of gravity in effect, this dynamic balancing act requires a vertical measuring tube.

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