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  2. Rotameter - Wikipedia

    en.wikipedia.org/wiki/Rotameter

    A rotameter is a device that measures the volumetric flow rate of fluid in ... graduations on a given rotameter will only be accurate for a given substance at a given ...

  3. Thorpe tube flowmeter - Wikipedia

    en.wikipedia.org/wiki/Thorpe_Tube_Flowmeter

    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 ...

  4. Flow measurement - Wikipedia

    en.wikipedia.org/wiki/Flow_measurement

    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 kind of rotameter used for medical gases is the Thorpe tube flowmeter ...

  5. LVDT flow meter - Wikipedia

    en.wikipedia.org/wiki/LVDT_flow_meter

    An LVDT (Linear Variable Differential Transformer) Variable Area Rotameter, is a meter designed to measure the flow rate of a fluid or gas. [citation needed]

  6. Discharge coefficient - Wikipedia

    en.wikipedia.org/wiki/Discharge_coefficient

    In a nozzle or other constriction, the discharge coefficient (also known as coefficient of discharge or efflux coefficient) is the ratio of the actual discharge to the ideal discharge, [1] i.e., the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an identical working fluid from the same initial conditions to the same exit pressures.

  7. Positive displacement meter - Wikipedia

    en.wikipedia.org/wiki/Positive_displacement_meter

    A positive displacement meter is a type of flow meter that requires fluid to mechanically displace components in the meter in order for flow measurement. Positive displacement (PD) flow meters measure the volumetric flow rate of a moving fluid or gas by dividing the media into fixed, metered volumes (finite increments or volumes of the fluid).

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