model L PTFE-PFA flow meters
Incorporating the principles of traditional rotameter flow technology, these rugged PTFE-PFA 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 PFA, 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 OPERATIONA cylindrical float freely moving inside a tapered flow tube comprises the flow measurement element of PTFE - PFA flow meters. The translucent PFA 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.
| SPECIFICATIONS |
| SCALES 0 to 10 markings |
| STANDARD ACCURACY ±5% FS |
| MAXIMUM OPERATING PRESSURE 100 psig (6.7 bars) |
| MAXIMUM OPERATING TEMPERATURE 250°F (121°C) |
| LEAK INTEGRITY individually leak tested and certified to a rating of 1 x 10-7 sccs of helium |
| MATERIALS OF CONSTRUCTION |
| FLOW TUBES PTFE, PFA |
| FLOATS PTFE |
| FRONT SHIELD polycarbonate |
| HOUSING PTFE |
| CONNECTIONS 1/4 inch FNPT to 3/4 inch FNPT based on model selected |
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L meter literature model L - PTFE/PFA rotameter catalog page(s)
Rotameter Catalog Full line Rotameter and Valves Catalog
Digital and Analog Flow Meters Catalog Full line Digital and Analog Flow Meters, Controllers, Valves and Accessories Catalog
