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A clamp-on ultrasonic flow meter gives an unreliable reading when the pipe is

  • A.partly full or the liquid heavily aerated
  • B.made of steel rather than plastic
  • C.carrying a flow above one metre per second
  • D.insulated on the outside

Answer: A

The technique depends on sound crossing the liquid, and bubbles or a free surface scatter the beam so the transit times cannot be resolved. Insulation is simply removed at the measuring point, and steel is the commonest material it is used on.

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