IKA C 6000 isoperibol Package 2/12 - Manual (Page 27)

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A complete measurement can be performed in
accordance with the following steps without ma-
king further changes to the settings:
Click on the „Preparation“ button in order to
prepare for a new measurement. The following
screen appears:
With automatic decomposition vessel detection:
To make preparations for a valid measurement
you must input at least the weight of the sample.
Click on the „Weighted sample“ selection fi eld; a
virtual keyboard appears.
Preparing measurements
The term „measurements“ below refers to both
the measurements to calibrate the calorimeter
system (calibration measurements) and the actual
measurements for determining the calorifi c value.
The difference lies mainly in the evaluation (see the section „Working with the device“ and „Set-
tings“), whilst preparation and performance make
virtually no difference.
The following preparations must be performed
in order to prepare the system to take a
measurement:
1.With the decomposition vessel open, attach a
cotton thread to the centre of the ignition wire
using a loop.
2. Weigh out the substance directly into the
crucible with an accuracy of 0.1 mg. If necessary
put some distilled water or a solution into the
decomposition vessel.
The maximum acceptable weight of the sample
that is added is restricted to a value of 5 g.
To prolong the life of wearing parts (o-rings,
seals, etc.) we recommend that you always
work with a water trap.
As a rule the weighted sample must be
selected in such a way that the temperature
increase during the measurement is below 5 K
and comes close to the temperature increase
of the calibration (max. extra energy: 40,000
J). Failure to observe these instructions could
result in damage to the decomposition vessel.
If the maximum energy input is exceeded, we
recommend that the calorimeter is sent back
for repair.
When working with unknown substances, at
fi rst select only very small weighted samples
(approx. 0.25 g) to determine the energy
potential. If you are burning unknown samples,
leave the room or keep well away from the
calorimeter.
If substances such as distilled water or
solutions are added to the decomposition
vessel for combustion tests, you must use
exactly the same amount of those substances
during calibration.
Refer also to the operating instructions for the
C 6010/C 6012 decomposition vessel.
Working with the IKA ® C 6000 global standards/isoperibol calorimeter