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A rotameter is a device that measures the volumetric flow rate of fluid in a closed tube. [1] It belongs to a class of meters called variable-area flowmeters, which measure flow rate by allowing the cross-sectional area the fluid travels through to vary, causing a measurable effect. [2]
The flow meter utilizes a unique combination of a tapered metering cone in series with a piston. The position of the metal piston is sensed by the LVDT circuitry and is then translated into a flow rate. [citation needed] This non linear signal can be directly displayed or linearized with an electrical output.
A rotameter is an example of a variable area meter, where a weighted "float" rises in a tapered tube as the flow rate increases; the float stops rising when area between float and tube is large enough that the weight of the float is balanced by the drag of fluid flow.
A Thorpe tube flowmeter, a type of variable-area flowmeter, or a rotameter, is an instrument used to directly measure the flow rate of a gas in medical instruments. It consists of a connection to a gas source, a needle valve opened and closed by turning an attached dial for control of flow rate, a float resting in a clear tapered tube, and an ...
Brooks Instrument is a manufacturer of flow control and measurement equipment based in Hatfield, PA.It was a division of Emerson (NYSE:EMR) until December 31, 2007 when it was sold to American Industrial Partners Capital Fund IV (“AIP”) for approximately $100 million in cash.
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