Resistance Temperature Detectors (
RTDs) available today can generally be categorized into one of two basic
types of
RTDs, depending on how their temperature sensing element is constructed. One
type of
RTD contains thin-film elements and the other
type of
RTD contains wire-wound elements.
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A Resistance Temperature Detector (RTD) is a device with a significant temperature coefficient (that is, its resistance varies with temperature). It is used as a temperature measurement device, usually by passing a low-level current through it and measuring the voltage drop.