Temperature and Heat Flow Rate Calibration of a Calvet Calorimeter from 0 degrees C to 190 degrees C

摘要

This study describes the temperature and heat flow rate calibrations of a Calvet calorimeter (SETARAM, BT2.15) in the temperature range of 0-190 degrees C. Temperature calibration is carried out using three reference materials, namely water, gallium, and indium, as specified in the International Temperature Scale of 1990 (ITS-90). The sample temperature of the Calvet calorimeter is corrected by the obtained mean value, -0.489 degrees C, of the measured extrapolated peak onset temperature (T-e) when the heating rate (beta) is zero (Delta T-corr(beta = 0)). The heat flow rate is calibrated using a reference material with a known heat capacity, namely SRM 720 alpha-Al2O3 (synthetic sapphire), which is traceable to the National Institute of Standards and Technology. From the heat flow rate measurements of the blank baseline and SRM 720, the proportional calibration factor, K-Phi, in the 0-190 degrees C temperature range was determined. The specific heat capacity of copper was measured with the obtained calibration values, and the measured data show consistency with the reference value.