Calibration and Exactness of Measurement
Each DTA apparatus should be calibrated before starting with investigations and later after almost 200 runs. For caloric measurements (see 4.2), a still more frequent calibration is necessary by heating of materials with well-known transformation temperatures and heats of reaction. Table 2 contains some substances and their transformation data suitable for calibration of a DTA apparatus following the intentions of Barshad, d’Ans-Lax, Wiedemann and Van Tets, and Smykatz-Kloss (1967 b). The determination of melting points (e.g., those of metals, see Wiedemann and Van Tets) has to be made in graphite crucibles with thermocouples lying directly below the crucibles.
KeywordsCombustion Clay Quartz Graphite Sulfide
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