Errors in dynamic calibration of thermoelectric transducers with differences between their thermal inertias
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The existing method of dynamic calibration of thermocouples can also be used for calibrating other thermal elements, for instance, thermistors, in which case a thermocouple or resistance thermometer should be used as a reference instrument. However, errors may be incurred in dynamic calibration if there is a difference between the thermal inertia of the reference and calibrated thermal elements. This circumstance limits the application of the dynamic method. This method is advantageous when it does not reduce the accuracy of calibration and provides a gain in calibration time as compared with the static method. The criterion of this gain is the ratio of the time spent on calibration by the static and dynamic methods.
Analysis has shown that the dynamic method with air calibration and an error of 1° provides a gain in time from 1.5 to 40 for all the thermistors under consideration with the exception of types KMT-4 and MMT-4. For a given calibration error of 0.1° it is advantageous to calibrate by the dynamic method (either in air or in oil) only thermistors type KMT-14.
It is possible by means of the nomogram provided in the article to determine the applicability of the dynamic method for calibrating thermal elements of a type or under static calibration conditions not covered by the article.
KeywordsPhysical Chemistry Analytical Chemistry Static Method Dynamic Method Thermal Inertia
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