Difference between Fixed Area & Variable Area FlowMeters

Difference between Fixed Area & Variable Area Flow Meters

Difference between Fixed Area and Variable Area Flow Meters

With orifice plates flow meters:

  • As the rate of flow increases, so does the differential pressure.
  • By measuring this pressure difference it is possible to calculate the flow rate through the flow meter.
  • The pass area (for example, the size of the hole in the orifice plate) remains constant.

With any type of variable area flow meter:

  • The differential pressure remains almost constant as the flow rate varies.
  • Flow rate is determine from the position of the float.
  • The pass area (the area between the float and the tube) through which the flow passes increases with increasing flow.

comparison of Fixed Area & Variable Area Flow Meters

Source : spiraxsarco

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