IKA C 5000 control Package 2/12 User Manual
Page 16
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Most liquid substances can be weighed directly into the crucible. Highly volatile sub-
stances are placed in combustion capsules (gelatin capsules ore acetobutyrate cap-
sules, see Accessories) and are burned together with the capsules.
The igniters (cotton thread) must be completely burned as well. If unburned remain-
ders of the igniter are left over, the experiment must be repeated or a correction
must be introduced into the result through the extraneous energy.
Substances with high halogen content can cause corrosion to appear on the de-
composition vessel. Decomposition vessel C 5012 should be used for these pur-
poses.
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To ensure exact reproducible measurement results, the calorimeter system is cali-
brated after it is first placed in service, after maintenance work, after parts are re-
placed and at specific time intervals. During calibration, the heat capacity of the
calorimeter system is re-determined.
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For this purpose, a specific quantity of a reference substance is burned in the de-
composition vessel under the conditions of the experiment. Since the gross calorific
value of the reference substance is known, it is possible to use the increase in tem-
perature of the calorimeter system when the reference substance is burned to cal-
culate the heat capacity.
The reference substance for calorimetry that is recognized at an international level is
benzoic acid obtained from the National Bureau of Standards (NBS-Standard Sam-
ple 39), with a guaranteed gross calorific value.
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For more detailed information on calibration, please refer to the appropriate stan-
dards as they are listed in Section 4 “Features of the system”.
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