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This document outlines the design and calibration of high-accuracy, fully waterproof platinum resistance thermometers (PRTs) developed for continuous submersion in temperature-controlled water jackets. It describes custom-engineered probes featuring Inconel sheaths, sealed cable glands, and long low-loss cables, delivering performance beyond IEC 60751 tolerances. The whitepaper highlights complete system calibration with ISO 17025 traceability and measurement uncertainty better than 15 mK for demanding industrial metrology applications.


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