Manual

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-WERKE C 5000 control/duo-control Ver. 10 04.07

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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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