In RTDs, which metal is commonly used for the resistance element?

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Multiple Choice

In RTDs, which metal is commonly used for the resistance element?

Resistance temperature detectors rely on a metal whose resistance changes with temperature in a very predictable and stable way. Platinum fits that need best because it remains stable over a wide temperature range, resists oxidation and corrosion, and has a resistance–temperature relationship that is highly repeatable and nearly linear. This makes calibration straightforward and allows standardized sensors like Pt100 or Pt1000 to be used reliably across different systems. Other metals either drift (like copper, which oxidizes and creeps at higher temperatures), are less stable (nickel-based elements), or corrode easily (aluminum), so they aren’t as suitable for precise RTDs. Platinum’s combination of stability, repeatability, and wide operating range is why it’s the common choice for the resistance element.

Resistance temperature detectors rely on a metal whose resistance changes with temperature in a very predictable and stable way. Platinum fits that need best because it remains stable over a wide temperature range, resists oxidation and corrosion, and has a resistance–temperature relationship that is highly repeatable and nearly linear. This makes calibration straightforward and allows standardized sensors like Pt100 or Pt1000 to be used reliably across different systems. Other metals either drift (like copper, which oxidizes and creeps at higher temperatures), are less stable (nickel-based elements), or corrode easily (aluminum), so they aren’t as suitable for precise RTDs. Platinum’s combination of stability, repeatability, and wide operating range is why it’s the common choice for the resistance element.

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