Rotameters - Aalborg Instruments - #39

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845.770.3000 - TOLL FREE IN U.S.A. AND CANADA 1.800.866.3837 - ORANGEBURG N.Y. U.S.A. 34 PTFE - PTFA FLOW METERS L **MATERIALS OF CONSTRUCTION FLOW TUBES PFA. FLOATS PTFE. WETTED PARTS PFA (flow tubes) and PTFE (end fittings and floats) and PCTFE (guide rods). SPECIFICATIONS SCALES 0 to 10 markings (see dimension table for scale lengths). ACCURACY ±5% of full scale. MAXIMUM TEMPERATURE 250F F (121FC). MAXIMUM PRESSURE 100 psig (6.7 bars). LEAK INTEGRITY Individually pressure and leak tested and certified to a rating of 1 x 10-7sccs of Helium. PRINCIPLES OF OPERATION A cylindrical float freely moving inside a tapered flow tube comprises the flow measurement element of PTFE - PFA flow meters. The trans lucent 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. MOUNTING DIMENSIONS * Dimensions are in inches, except as shown in [mm]; for certified dimensions contact the company. **The selection of materials of construction, is the responsibility of the customer. The company accepts no liability. BULLETIN EM200910 L