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Answer Posted / prasanna
RTD:
RTD means resistive temperature device that made out of a
metal like Platinum (Eg: Pt100 sensor). Resistance of the
metal is linearly proportional to the temperature over wide
temperature range so that temperature can be determined
from the resistance;
Thermocouple:
Thermocouple is a junction made out of two different
metals. There will be an emf generated which is related to
temperature of the junction. This phenomenon is called
Seebeck effect.
Precisely speaking, the emf will be related to temperature
different between thermocouple junction and measuring
point, which is called cold junction.
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