Which one of the following is a characteristic of a resistance temperature detector but not a thermocouple?
A. Sensing element is made from a single metal or alloy.
B. Requires a reference junction for accurate temperature measurement.
C. Extension leads made from relatively expensive metals or alloys are required for accurate temperature measurement.
D. Temperature measurement relies on a sensor material property that varies directly with the change in the measured temperature.
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Answer: A
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