Calibration of Temperature Sensors Using a High-Accuracy Millikelvin Thermometer
Temperature sensors may drift or develop offsets, leading to unreliable readings and poor control. This report describes comparison calibration using high-accuracy temperature measurements. With a measurement uncertainty of 1 mK, the MKT 50 enables traceable and accurate calibration under stable thermal conditions for lab and industry.
Temperature is one of the most frequently measured physical quantities in industrial and laboratory environments. In process automation, large numbers of temperature sensors are often operated continuously, for example, in breweries, chemical plants, or pharmaceutical production facilities. To ensure product quality, process reliability, and compliance with quality standards, these sensors must be calibrated at regular intervals.
A widely used method is comparison calibration, in which the sensor under test (“Device Under Test”, DUT) is compared against a high-accuracy reference thermometer in a stable thermal environment such as a liquid bath or metal block calibrator. The accuracy and long-term stability of the reference system are critical, as they directly determine the achievable calibration uncertainty.
This application report describes the use of a thermometer with an accuracy of 1 mK as a reference instrument for high-accuracy comparison calibration of temperature sensors and illustrates the impact of reference accuracy on the overall measurement uncertainty.
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