IKA C 7000 Grundausstattung Set 2 - Manual (Page 26)

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For the most precise results, the calorimeter should be calibrated during commis-
sioning, following service work, when parts have been replaced, and at defined in-
tervals. The purpose of calibration is to re-determine the thermal capacity of the
calorimeter system (C value).
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Calibration is carried out by burning a known quantity of a reference substance in
the decomposition vessel under test conditions. Since the calorific value of the ref-
erence substance is known, it is possible to use the temperature increase of the
decomposition vessel to calculate its heat capacity.
The reference substance used internationally for calorimetry is benzoic acid from the
National Bureau of Standards (NBS Standard Sample 39), which has a guaranteed
calorific value.
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For more detailed information on calibration, please refer to the relevant standards.
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