VARIABLE AREA FLOWMETER | Rotameter Measure of Liquids, Gases and Steam
Variable Area Measuring
Variable area flowmeters are simple and versatile devices that operate at a relatively constant pressure drop and measure the flow of liquids, gases, and steam. Variable Area (VA) flowmeters make use of a float, piston or vane placed inside a flow body, which changes position in response to changes in flow rate of the measure fluid media. The position of the float, piston or vane provides a direct visual indication of flow rate. Either the force of gravity or a spring is used to return the float to its resting position when the flow lessens. For a more detailed discussion of the principle of operation, please go to: http://www.smartmeasurement.com/flow-meters/variable-area/measuring-principle
SmartmeasurementTM’ s ALVAMT Variable Area flow meter is of the spring operated variety, which allows the meter to be mounted in either horizontal or vertical orientations. The ALVAMT makes use of rugged, metal tube construction making it ideal for high pressure, high temperature and other demanding flow applications where safety is a concern. Features include mechanical readouts for use in locations where power is not available or in hazardous areas; analog and digital LCD local display options, multiple process connection options; several different materials of construction for metering of aggressive fluids and corrosion resistance; and HART enabled 4-20mA output to allow for remote monitoring and control.
Heavy-duty flow meters are fully enclosed in a brushed stainless steel case. Ideal for industrial applications with flow rates up to 116 GPM and 250 SCFM. Used with industrial water and air service. Meters are graduated for direct reading of water and air. Flow meters come with FNPT end fittings for easy in-line installation. Wetted parts include borosilicate glass flow tubes, viton o-rings, and 316 Stainless steel fittings, guide rods, floats and float stops.
SPECIFICATIONS
STANDARD ACCURACY ±3% FS
MINIMUM FLOW RATE approximately 10% of maximum flow rate
REPEATABILITY ±0.5% FS
MAXIMUM OPERATING PRESSURE 200 psig at 200°F (13.8 bars at 93°C) for tube sizes 3, 4, 5 and 6; 125 psig at 200°F (8.6 bars at 93°C) for tube sizes 8 and 9
MAXIMUM OPERATING TEMPERATURE 200°F (93°C)
MATERIALS OF CONSTRUCTION
FLOW TUBES heavy walled precision formed borosilicate glass
FLOATS 316 stainless steel
TUBE SHIELD polycarbonate
WETTED PARTS 316 stainless steel
SEALS Viton® o-rings standard; optional Buna-N, PTFE/Kalrez®, EPR
VITON® and KALREZ® are registered trademarks of DuPont Dow Elastomers
The Variable Area Flowmeter is one of the oldest and mature principles in flow measurement. Right from the outset, the Rotameter convinced with its simple design: a float rises inside a conically shaped glass tube as the flow increases and its position on a scale can be read off as the flow rate. Felix Meyer, the founder of „Deutsche Rotawerke“, was quick to recognise the importance of the variable area flowmeter developed by Karl Küppers who found the perfect shape of a float that causes it to rotate and therefore provides self-stabilization.
VARIABLE AREA FLOWMETER | Rotameter Measure of Liquids, Gases and Steam
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