Disadvantages of Differential Pressure Flow meters

– Square root relationship between flow rate and differential pressure, therefore smaller span
– Affected by pressure and density changes
– Pressure drop for orifice plates
– Edge sharpness for orifice plates must be assured, therefore no solids or contamination
– Very long inlet and outlet sections
– Expensive installation requiring differential pressure lines, fittings and sensors
– Installation and maintenance experience advantageous
– High maintenance requirements

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