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About Temperature Sensors-Your Free Guide to Temperature Sensor Information on the Web
How Resistance Temperature Detectors (RTDs) Work

RTDs are wire wound and thin film devices that work on the physical principle of the temperature coefficient of electrical resistance of metals. They are nearly linear over a wide range of temperatures and can be made small enough to have response times of a fraction of a second. They require an electrical current to produce a voltage drop across the sensor that can be then measured by a calibrated read-out device.
There's obviously much more to it than that, and there's lots of information on the Web that can help you understand those important details.
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