Operating Principle Acrylic Rotameter is basically a variable area flow meter. The diffrential pressure across the annulus area is constant and the Flowrate is measured as a function of the position of annulus area. This area is displayed as the position of the 'Float' in terms of flow rate on the scale. Standard Features • Line Size from 6mm to 80 NB • Ranges between 1-10 LPMto 1200-12000 LPH • Accuracy: +/- 4% of full scale • Solid acrylic Block