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A thermal imaging camera is preferred to a spot thermometer when the question is

  • A.the temperature inside a closed vessel
  • B.the emissivity of an unknown surface
  • C.where on a large surface the hot region lies
  • D.the exact temperature of one known point

Answer: C

Scanning a switchboard or a furnace wall reveals the loose joint or the failed insulation without knowing in advance where to look, which is precisely what a spot instrument cannot do. Absolute accuracy is better from a calibrated contact probe.

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