The wire types are generally the more accurate, due to the tighter control over metal purity and less strain related errors. The wire may be bonded to the ceramic using a glaze. Wire RTDs are a stretched coil of fine wire placed in a ceramic tube that supports and protects the wire. RTDs are manufactured in two ways: using wire or film. While the resistance – temperature characteristics of certain semiconductor and ceramic materials are used for temperature sensing, such sensors are generally not classified as RTDs. The most common metals used for temperature sensing are platinum, nickel, copper and molybdenum. The temperature coefficient for all pure metals is of the same order – 0.003 to 0.007 ohms/ohm/☌. Resistance Temperature Detectors (RTDs) rely on the predictable and repeatable phenomena of the electrical resistance of metals changing with temperature.
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