IKA C 7000 Grundausstattung Set 2 - Manual (Page 40)

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IKA  -WERKE C 7000 Ver. 07 09.07
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In the C 7000 calorimeter, measurement is fully automatic.
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The decomposition vessel is removed from the C 7000 calorimeter and placed in the
C 7002 cooler, where it is automatically cooled to the temperature of the calorimeter.
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The decomposition vessel is vented using the C 7010.8 vent handle or venting sta-
tion C 7030.
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Clean and check the decomposition vessel as described in Section 7.6.
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As can be seen in the diagram, a complete test procedure can be sub-divided into
several phases. To make maximum use of the calorimeter, you need four decompo-
sition vessels (DV No. 1 to DV No. 4 ) which are used as follows:
As one decomposition vessel is being prepared for a test (steps 1 to 4 in the cycle of
operations), a second vessel is undergoing a test (step 5 in the cycle of operations).
At the same time, a third decomposition vessel is cooling (step 6 in the cycle of op-
erations), while the fourth is being vented and cleaned (steps 7 and 8 ).
By using four vessels in parallel in this way, well over 100 tests can be carried out
with one calorimeter in a single day. By using two or three decomposition vessels in
a similar manner, a proportionately smaller time saving can be achieved.
To obtain the most accurate results, it is essential to observe the cycle of operations
shown above.
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Before precise measurements can be made with the calorimeter, it must be cali-
brated. To calibrate the instrument, tablets of FHUWLILHG EHQ]RLF DFLG (see accesso-
ries) with a known calorific value are burnt. This test is used to determine the quan-
tity of heat required to raise the temperature of the calorimeter by 1 Kelvin. This is
known as the heat capacity (C value) of the system. This constant is needed later to
calculate gross calorific values.
The heat capacity is influenced both by the measuring cell and by the decomposition
vessel. ). It has a substantial influence on the gross calorific value being determined,
and must be re-established from time to time, particularly at commissioning, follow-
ing servicing and when parts are replaced.
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