IKA C 5000 control Package 2/12 - Manual (Page 71)

IKA  -WERKE C 5000 control/duo-control Ver. 10 04.07
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The C 5000 calorimeter system is a precision measuring instrument for routine de-
terminations of gross calorific values for solid and liquid substances. Exact meas-
urements are only possible, however, if the individual steps of the experiment are
performed with great care. The method of proceeding as it is described in Chapter 1
“For your safety” and in the following sections must be adhered to precisely.
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Substances of which the combustion behavior is not known must be examined for
their combustion behavior before combustion in the decomposition vessel C 5010 or
C 5012 (danger of explosion). If you are burning XQNQRZQ VDPSOHV , leave the room
or NHHS D VDIH GLVWDQFH between you and the calorimeter.
A few points must be observed in reference to the substances to undergo combus-
tion. Normally, solid combustion substances can be burned directly in powder form.
Substances that burn rapidly (for example benzoic acid) must not be burned in loose
form.
Benzoic acid must only be burned in the form of pellets! Combustible dust and pow-
der must be compressed into pellets before combustion. Oven-dry dust and powder
such as wood chips, hay, straw, etc. burn in an explosive manner! They must be
moistened first! Readily combustible liquids with a low vapor pressure must not be
come in direct contact with the cotton thread (for example tetramethyl dihydrogen
disiloxan)!
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The IKA  tablet press C 21 is especially suitable for this purpose.
Most liquid substances can be weighed directly into the crucible. Liquid substances
with turbidity or water that will settle out must be dried or homogenized before being
weighed in. The water content of these samples must be determined.
For highly volatile substances, a gelatin capsule or acetobutyrate capsules (see ac-
cessories) are used. The gross calorific value of the capsules must be known so that
it can be taken into account in the resulting combustion heat as extraneous energy.
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