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    what is RTD

    0  Views: 302 Answers: 1 Posted: 14 years ago

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       Resistance thermometers, also called resistance temperature detectors (RTDs), are sensors used to measure temperature by correlating the resistance of the RTD element with temperature. Most RTD elements consist of a length of fine coiled wire wrapped around a ceramic or glass core. The element is usually quite fragile, so it is often placed inside a sheathed probe to protect it. The RTD element is made from a pure material, 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.


    They are slowly replacing the use of thermocouples in many industrial applications below 600 °C, due to higher accuracy and repeatability.


    http://en.wikipedia.org/wiki/Resistance_thermometer


    http://www.jms-se.com/rtd.php



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