Preparing The Decomposition Vessel; Preparing The Measurement - IKA C 200 Operating Instructions Manual

6.2 Preparing the decomposition vessel

Prepare the decomposition vessel as follows:
 Cover

Union nut

Handle

Cotton thread
 Unscrew the union nut and remove the cover
using the handle.
 Attach a cotton thread to the centre of the
ignition wire using a loop.
 Weigh out the substance directly into the
crucible with an accuracy of 0.1 mg. Note the
weight or enter directly into the calorimeter. (See
 Fill the decomposition vessel using oxygen sta-
section 6.3 "Preparing the measurement").
tion C 248 (see section 4.10).
 Insert the crucible into the crucible holder.
 Slide the ignition adaptor onto the decompo-
sition vessel.
If necessary put some distilled water or a solution
into the decomposition vessel.
For information on how to operate the decompo-
sition vessel, please see the operating instructions
See section 5.3 "Information about the samp-
provided.
le" and section 1 "Safety precautions".
 Using tweezers, align the cotton thread so that
it hangs inside the crucible and is immersed in the
sample. This will ensure that the burning thread
ignites the sample during the ignition process.
 Attention! Place the cover onto the lower
section and push down until it presses against the
stop piece in the lower section. Place the union
nut onto the lower section and tighten by hand.
 Place the decomposition vessel into the inner
vessel of calorimeter C 200. The decomposition
vessel must be placed between the three locating
bolts.
 Pour approx. 2 l tap water maintained at a con-
stant temperature into the tank using the measu-
ring cup. Keep an eye on the level indicator!
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Attaching Detaching

6.3 Preparing the measurement

the ignition the ignition
adaptor adaptor The calorimeter is in "waiting" mode.
1.
2.
 Selecting MEASUREMENT (F2) will take you
to the "Prepare measurement" menu.
 Enter the noted weighted sample in the
marked "Einwaage" (weighted sample) field with
an accuracy of 0.0001 g using the keyboard.
You can access all the other options by pressing
UP/DOWN (F2):
Locating bolt
 CALIBRATION
Enter "1" here to perform a calibration.
 Check the other presettings:
DECOMPOSITION VESSEL
Enter the number of the decomposition vessel
used for this test. If you are only using one de-
composition vessel, you can leave the "1" in the
"decomposition vessel" field.
QEXTERNAL1
Correction value for the heat energy generated
by the cotton thread ignition aid. A default value
of 50 J is specified here. The default value for the
combustible crucible option is 0 J. If you use a
Magnetic stirring bar
burning aid other than the C 710.4 IKA-cotton
thread, change this value.
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