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An orifice plate measures flow by

  • A.the cooling of a heated element in the stream
  • B.the pressure drop it creates across a restriction
  • C.the time a sound pulse takes to cross the pipe
  • D.the rotation it imparts to a bladed rotor

Answer: B

The differential pressure varies as the square of the flow, so the meter is read through a square root and its accuracy suffers at low flow. It is cheap and permanent and imposes a lasting pressure loss, which is itself an energy cost worth noting in an audit.

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