TC vs. RTD

TC: thermoelectric couple
RTD: resistance temperature detector
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RTD: Cu, Pt
Cu material: low precision, cheap
Pt material: high precision, expensive
when (>-200`C && <0`C):: Rt=Ro[1+At+Bt^2+C(t-100)t^3]
when(>0`C && <650`C):: Rt=Ro[1+At+Bt^2]
Cu material:
used between -50`C and 150`C:: Rt=Ro[1+at]