As outlined by Engineering Toolbox in their article “Temperature Sensors – Comparing Types”, different temperature sensors offer unique advantages and drawbacks. The three most commonly used types—thermocouples, RTDs, and thermistors—each operate based on distinct principles and suit different industrial applications.

Thermocouples consist of two dissimilar conductors forming electrical junctions at varying temperatures. They generate a temperature-dependent voltage based on the thermoelectric effect, making them ideal for high-temperature applications due to their durability and wide temperature range.

RTDs (Resistance Temperature Detectors) are built with fine wires wrapped around a ceramic or glass core, typically made from platinum, nickel, or copper. Their electrical resistance changes predictably with temperature, providing high accuracy and stability, which makes them well-suited for precise temperature measurements in industrial processes.

Thermistors are temperature-sensitive resistors made of ceramic or polymer materials. Like RTDs, their resistance varies with temperature, but thermistors typically provide greater sensitivity in a narrower temperature range, making them ideal for low-temperature applications requiring fast response times.

Selecting the right temperature sensor depends on factors such as accuracy, response time, durability, and environmental conditions. For high-heat environments, thermocouples excel, while RTDs offer precision and reliability, and thermistors are perfect for rapid temperature detection in controlled settings.

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Article with all rights reserved, courtesy of Engineering Toolbox.