|Application||Laboratory, Chemical Industries|
|Accuracy||2% of FSD|
|Types||Acrylic Body, Glass Tube, Metal Tube, Bypass Tube|
|Size||6 mm-500 mm|
|Accessories||Built-in Needle Valve, Digital Indicator, transmitter with 4-20 mA Output|
|Service||Water, Air, Oil, Gases, Chemicals, Milk, Solvents|
|End Connections||Screwed, Flanged, Tri-clover, SMS Union|
Kent Flow TubeRotameter consists of a tapered tube, typically made of glass with a 'float', actually a shaped weight, inside that is pushed up by the drag force of the flow and pulled down by gravity. Drag force for a given fluid and float cross section is a function of flow speed squared only, see drag equation. A higher volumetric flow rate through a given area increases flow speed and drag force, so the float will be pushed upwards. However, as the inside of the Rota Meter is cone shaped (widens), the area around the float through which the medium flows increases, the flow speed and drag force decrease until there is mechanical equilibrium with the float's weight. Floats are made in many different shapes, with spheres and ellipsoids being the most common. The float may be diagonally grooved and partially colored so that it rotates axially as the fluid passes. This shows if the float is stuck since it will only rotate if it is free.