Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature. Many RTD elements consist of a length of fine wire wrapped around a heat-resistant ceramic or glass core but other constructions are also used. The RTD wire is a pure material, typically platinum (Pt), nickel (Ni), or copper (Cu). The material has an accurate resistance/temperature relationship which is used to provide an indication of temperature. As RTD elements are fragile, they are often housed in protective probes.
RTDs, which have higher accuracy and repeatability,[a] are slowly replacing thermocouples in industrial applications below 600 °C.[1]
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^Jones, Deric P. (2010), Sensor Technology Series: Biomedical Sensors, Momentum Press, ISBN 9781606500569, retrieved September 18, 2009
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