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Resistive temperature detector (RTD)
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Resistance Temperature Detectors have achieved a well deserved reputation in the industry for their superior stability and accuracy. The result makes these devices well suited for a wide variety of applications.

A Resistance Temperature Detector (RTD) senses heat based on the principle that a change in temperature results in a corresponding change in the resistance of a wire. The hotter the wires become, the larger or higher the value of their electrical resistance. RTDs are among the most precise temperature sensors available.

The RTD can be comprised of many different termination styles as seen on the following pages. The RTD element is manufactured by winding a wire of plating a film on a ceramic or glass core. Usually RTDs are provided encapsulated in probes for temperature sensing and measurement with an external indicator, controller or transmitter, or enclosed inside other devices where they measure
temperature as a part of the device's function, such as a temperature controller or precision thermostat.