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A thermowell fitted round a thermocouple in a pipe

  • A.prevents the extension leads from introducing a spurious emf
  • B.protects the junction but lengthens its response time
  • C.improves the response time by conducting heat to the junction
  • D.provides the cold junction reference for the measurement

Answer: B

The metal sheath and any air gap within it must be heated before the junction responds, so the time constant may rise from a fraction of a second to tens of seconds. The trade against mechanical and chemical protection is a routine engineering decision.

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