Temperature Detectors RESISTANCE TEMPERATURE DETECTORS (RTDs)RESISTANCE TEMPERATURE DETECTORS (RTDs)The resistance of certain metals will change as temperature changes. Thischaracteristic is the basis for the operation of an RTD.EO 1.1 DESCRIBE the construction of a basic RTD including:a. Major component arrangementb. Materials usedEO 1.2 EXPLAIN how RTD resistance varies for the following:a. An increase in temperatureb. A decrease in temperatureEO 1.3 EXPLAIN how an RTD provides an outputrepresentative of the measured temperature.TemperatureThe hotness or coldness of a piece of plastic, wood, metal, or other material depends upon themolecular activity of the material. Kinetic energy is a measure of the activity of the atoms whichmake up the molecules of any material. Therefore, temperature is a measure of the kineticenergy of the material in question.Whether you want to know the temperature of the surrounding air, the water cooling a car’sengine, or the components of a nuclear facility, you must have some means to measure thekinetic energy of the material. Most temperature measuring devices use the energy of thematerial or system they are monitoring to raise (or lower) the kinetic energy of the device. Anormal household thermometer is one example. The mercury, or other liquid, in the bulb of thethermometer expands as its kinetic energy is raised. By observing how far the liquid rises in thetube, you can tell the temperature of the measured object.Because temperature is one of the most important parameters of a material, many instrumentshave been developed to measure it. One type of detector used is the resistance temperaturedetector (RTD). The RTD is used at many DOE nuclear facilities to measure temperatures ofthe process or materials being monitored.Rev. 0 Page 1 IC-01
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