Composition of Glass Tube Rotameter:

　　Metering tube:

　　In modern practice, they are formed in a mandrel and annealed to avoid internal stress, resulting in a strong and uniform tube. This method also allows the formation of tubes with higher reproducibility and interchangeability, as well as the formation of special shapes, such as non-tapered tubes with curved elements, aimed at extending the scale at the lower end of the range.

　　float:

　　The float can be made of various materials to obtain corrosion resistance or capacity changes. The classification is usually based on the capacity of the meter, using stainless steel floats.

　　It has been found that the shape of the float largely determines the way the Glass Tube Rotameter is affected by changes in the viscosity of the measured fluid. It has been found that floats with sharp edges are relatively insensitive to viscosity changes over a considerable viscosity range.

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