PRINCIPLE OF OPERATION

When compared with other types of flow instrumentation,variable area interchangeable industrial flow meters offer the most practical, precise and economical means of visually indicating flow rate measurement.

They require no electrical connections, and have low meter related pressure drops.Meters are available in a large selection of flow rates and configurations, to accommodate the unique requirements of most applications.Included in the line are flow tube assemblies, single and multiple tube flow meters. PTFE-Glass meters are for metering corrosive fluids or for high purity requirements.Back pressure compensated Gas Proportioners are popular choices for blending component gases accurately to customized end use requirements at great savings.Multiple tube flow meters are available with or without manifolding. Flow meters are installed vertically in lines carrying gases or liquids to be monitored.Fluids enter through the smaller opening at the bottom,and exit through the upper end. Upward pressure causes the float to rise. Flow takes place through the circular area between the float and the inside surface of the flow tube.As the float rises,the flow areaincreases,due to the tapered bore of the flow tube.Dynamic equilibrium results when the buoyantforce,due to the float and the upward force,due tofluid pressure,balance the weight of the float.The vertical position of the float at equilibrium corresponds exclusively to one particular flow rate.This flow rate is obtained by determining the height of the float with the aid of a scale etched on the flow tube.

A tapered glass FLOW TUBE, and a spherical FLOAT inside it, constitute the heart of variable area type flow meters. These meters have the highest useful flow ranges providing consistently reliable readings from maximum flow down to 5 to 10% of capacity.

BULLETIN EM200703PRINCIPLE OF OPERATION

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