Variable-area flow meter L series

volumefor waterfor corrosive fluids

model L rugged PTFE flow meters offer solutions to low to medium flow range measurements Design Features chemically inert components constructed from PTFE and PCTFE structurally rigid frame individually leak tested Description Incorporating the principles of traditional rotameter flow technology, these rugged PTFE flow meters offer solutions to low to medium flow range measurements of highly corrosive or ultra-pure liquids. Model L Meters are constructed of inert materials such as PTFE and PCTFE. The design represents a unique combination of a rugged mechanically rigid frame and the chemically inert wetted parts. Flow meters are also resistant to external, ambient corrosives. For the protection of personnel each flow meter is supplied with a safety shield. Variable area flow meters (rotameters) are supplied with or without built-in needle valves and they are panel mountable, by means of panel nuts. PRINCIPLES OF OPERATION A cylindrical float freely moving inside a tapered flow tube comprises the flow measurement element of PTFE flow meters. The translucent flow tube is installed vertically in-line in the liquid stream. As flow takes place the float is propelled up inside the flow tube. The area between the float and the inside diameter of the flow tube gradually increases with increasing flow and correspondingly the pressure lifting the float decreases until the weight of the float and its buoyant force come to equilibrium. At equilibrium the top of the float is lined up with a scale graduation on the flow tube denoting a discrete rate of flow.