Glass Tube Rotameter

Glass Tube Rotameter is a Variable Area Flow Meter. A rotameter consists of a tapered tube, typically made of glass, with a 'float' made of SS or PTFE. The differentila pressure across the annulus area is constant. The float moves through the tapered tube up and down with respect to fluid flow. The vertical position of the float as indicated by scale is the measure of the instantaneous flow rate.

It is an instrument used to measure instant flow rate of Liquids and Gases. It is installed in the pipe line vertically upward with flanged or screwed connection.