Discussion
An auditor's infrared readings of a steam header vary widely along its length while a contact probe finds it uniform. The explanation is
Answer: B
Correct answer: the surface finish and therefore the emissivity varies
An infrared instrument infers temperature from emitted radiation, and how much a surface emits at a given temperature depends on its finish - bright metal, oxidised metal, paint and lagging all differ greatly. A header that is uniformly hot but variably painted, cleaned or corroded will therefore read as if its temperature varied. The contact probe measures the temperature directly and is telling the truth.
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