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Resistance Temperature Detector (RTD). An RTD sensing element usually consists of a metal filament, which is coiled on a mandrel or etched on a substrate. The RTD element is made from a pure material, typically platinum, nickel or copper. The material has a predictable change in resistance as the temperature changes; it is this predictable change that is used to determine temperature.
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RTD sensors and the mystery of Voltage Vs Current sources
Stackexchange questions that were about RTD sensors but only vaguely relevant:
Improving RTD Sensor filtering and readout
--> Decent classic circuit for RTD sensors, but not much conclusive here. … Single current source with parallel loads for many RTD sensors
--> More RTD discussion. …