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Resistance Temperaturd Devices (RTDs)

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RTDs are similar to thermistors, but they generally cost more and are more accurate. That's because RTDs are made from thin films of elemental metals, such as platinum. Because platinum has very low bulk resistivity, you need to create a thin film with a lot of squares to obtain a useful total resistance.

The temperature coefficient of resistance (TCR) of platinum RTDs is around 0.0038 ohms/ohms/°C.

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