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An ultrasonic flow meter is valuable in an audit because it

  • A.measures flow more accurately than any other method
  • B.requires no knowledge of the pipe's dimensions
  • C.works equally well on any pipe material or condition
  • D.clamps on outside the pipe without breaking into it

Answer: D

Cutting into a live process line to fit a meter is rarely permitted for an audit, and a clamp-on transducer gives a figure in minutes. It needs the wall thickness and material entered, a clean liquid and a full pipe, and is defeated by heavy scaling.

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