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RTDsuppliers.com is your number one source for anything having to do with temperature measurement and specifically RTDs, PT100, Platinum RTD, Resistance Temperature Detectors, Platinum Resistance Thermometers, Thin-Film RTDs or whatever term you refer to them by.  On our site you will find multiple articles and technical references as well as a directory of quality RTD and other temperature sensor suppliers. 

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A platinum resistance temperature detector (RTD) is a device with a typical resistance of 100 Ω at 0 °C. It consists of a thin film of platinum on a plastic film. Its resistance varies with temperature and it can typically measure temperatures up to 850 °C. Passing current through an RTD generates a voltage across the RTD. By measuring this voltage, you can determine its resistance and, thus, its temperature. The relationship between resistance and temperature is relatively linear.