April 23, 2021

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DTA

Differential Thermal Analyzer (DTA)

Perkin Elmer DTA 7

The Differential Thermal Analyzer (DTA) is closely related to the DSC. While the DSC measures mass as a function of temperature, the DTA measures the difference in temperature between a sample and a reference as a function of temperature. The basic configuration consists of a sample holder, reference holder and two thermocouples which sit inside a furnace heated by electrical resistance. The difference in temperature can be attributed to properties such as heating rate, the mass of the sample and its heat capacity. These properties will contribute to a lag in the temperature between the sample and the reference while heating. If the difference in temperature is negative, the sample requires more heat than the reference sample to increase the internal temperature. If the difference in temperature is positive, the sample requires less heat than the reference sample to increase the internal temperature.