IKA C 2000 control - Manual (Page 24)

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To ensure precise, reproducible results of the measurement, the calorimeter system
is calibrated after it is initially placed in service, after service jobs, after parts are
replaced and at specific time intervals. During calibration, the heat capacity of the
calorimeter system is redetermined.
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For this purpose, a specific quantity of a reference substance undergoes combus-
tion in the decomposition vessel under the conditions of the experiment. Since the
gross calorific value of the reference substance is known, it is possible after com-
bustion has occurred to calculate the heat capacity based on the increase in tem-
perature of the calorimeter system.
The reference substance for calorimetry on an international level is benzoic acid of
the National Bureau of Standards (NBS Standard Sample 39) with a guaranteed
gross calorific value.
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For more information on calibration, we refer you to the applicable standards.