How the Water Rotameter works
The Water Rotameter measures the flow rate by moving the internal parts to change the flow rate to the opening in the flow meter. When the flow rate increases, the fluid generates more force and moves the internal components farther.
A Water Rotameter measures the flow rate in a vertical metering tube by balancing the downward weight of the float and the upward force of the flowing fluid. The spring opposed float design allows this type of flowmeter to be installed in a horizontal pipeline because the function of the float does not depend on gravity. These Water Rotameters can be read locally because their glass or plastic metering tubes are marked to correlate the height of the float (which can be seen) with the flow rate of the fluid. A flow meter with a remote signal is usually composed of a metal tube and includes a sensor that can sense the height of the float to determine the fluid flow rate.
The vane-type variable area flowmeter has a spring opposed vane that can move according to the flow rate. Similarly, the piston-type variable area flowmeter uses a spring opposed-piston, which moves according to the flow rate and is less sensitive to viscosity than the vane-type variable area flowmeter. Both vane and piston variable area flowmeters can be connected to indicators or transmitters.
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