Resistive Temperature Detectors, or RTDs, are resistors made of metal, which change resistance with temperature. RTDs have the best long term stability and accuracy of the traditional temperature sensor types and cover ranges from -200°C to +850°C. They’re very stable and are relatively easy to signal condition. The most common RTD is the PT100: a platinum based 100 ohm RTD. Because of the expensive metals used in their construction, RTDs are costlier than other sensor types.

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