Resistance thermometers (resistance thermometer detectors) are sensors used to measure temperature. The materials used for RTDs are extensive. Ceramic, glass, and metal has all been used in RTDs. The metal RTD wire is typically platinum, nickel, or copper. Obviously, the value of the RTD goes up when the materials used to make said RTD go up as well. 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.
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