What is the primary reason platinum metal is preferred over other metals for Resistance Temperature Detector (RTD) construction?
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A.
It has a high thermal conductivity.
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B.
It is the most cost-effective metal for temperature sensing.
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C.
It has a stable and non linear relation ship between temperature and resistance.
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D.
It exhibits a perfectly linear resistance-temperature relationship.
Correct Answer:
D. It exhibits a perfectly linear resistance-temperature relationship.
Explanation:
Platinum is the preferred material for Resistance Temperature Detectors (RTDs) primarily because it offers a highly stable, predictable, and nearly linear relationship between temperature and electrical resistance over a very wide range. As a noble metal, platinum is chemically inert and resistant to corrosion and oxidation, ensuring that its electrical properties remain consistent over long periods of use. While other metals like nickel or copper are more cost-effective, they are limited by smaller temperature ranges, non-linearity, or susceptibility to environmental degradation. Platinum's high purity and repeatability make it the international standard for high-accuracy temperature measurement in industrial and laboratory settings.
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