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<p>I think because of their sensing concept, thermocouples produce output voltage analogue to their hot joint temperature depending on the voltage induced by the effect of "moving" electronics motivated by heating and it is difficult for cooled environment to be able to motivate electronics in such sufficient and reliable manner where resistors are just resistor materials that depend on a behavior that looks like concept of e<span><span>xpansion and contraction and can be detected by very well-designed electronics.</span></span></p> <p><span><span>This is just a personal opinion not scientific information. What do you see ?</span></span></p>
Thermocouples are high temperature sensing elements ranging from150oC to several hundred degrees. These elements do not generate any remarkable output at low temperatures.
On the other hand, PT100, Thermistors etc give dependable output at low temperatures.