IKA C 7000 Grundausstattung Set 2 - Manual (Page 43)

IKA  -WERKE C 7000 Ver. 07 09.07
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The individual parts, and in particular the threading of the decomposition vessel
must be checked regularly for wear and corrosion. Note in this regard Operating
Instructions C 7010 or C 7012.
The C 7000 calorimeter is a precision instrument for routine measurement of the
gross calorific value of solid and liquid substances. Accurate measurement is only
possible if the all the individual steps in a test are carried out with care. The proce-
dure as it is described in Chapter 1 “For your safety” and in the sections below must
therefore be followed 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 7010 or
C 7012 (danger of explosion). If you are burning XQNQRZQ VDPSOHV , leave the room
Normally, solid fuels can be burnt directly in powder form. Fast-burning substances
(e.g. benzoic acid) must not be burnt in a 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  C 21 pelleting press is suitable for this task.
Most liquids can be weighed directly into the crucible. Liquids that are cloudy or with
separable water must be dried or homogenised before weighing. The water content
of such samples must be determined.
For highly volatile substances, gelatine or acetobutyrate capsules (see accessories),
which are filled with the fuel, must be used. The calorific value of the capsules must
be known, so that the heat of combustion resulting from them can be taken into ac-
count as external energy.
For low flammability substances and those with low calorific value, the capsules
mentioned above, or combustion bags made of polyethylene (see accessories) are
used. The C 14 combustible crucibles can also be employed.
Before the capsules or combustion bags are filled with the substance whose calorific
value is to be determined, they must be weighed, so that from their mass and calo-
rific value, the amount of external energy they contribute to combustion can be cal-
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