The RTDs resistance vs temperature characteristics are stable, reproducible, and have a near linear positive temperature coefficient from 200 to 800°C. These attributes establish RTDs as a de-facto industry standard. Temperature is determined by measuring resistance and then using the RTDs R vs T. Characteristics to extrapolate temperature. The superior sensitivity and stability of these devices, in comparison to thermocouples, give them important advantages in low and intermediate temperature ranges. In addition, resistive devices often simplify control and readout electronics. Resistance thermometers may be called RTDs (resistance temperature detectors), PRTs (platinum resistance thermometers), or SPRTs (standard platinum resistance thermometers).
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