Metrohm 892 Professional Rancimat - Manual (Page 38)

4.3 Determinations
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892 Professional Rancimat
4.3 Determinations
4.3.1 Preparing a sample
NOTE
Use new reaction vessels and air tubes for each measurement.
Blow out the reaction vessels with nitrogen before use.
This chapter contains information on how to prepare the following sam-
ples:
￭ Pure, clear oils (see page 30)
￭ Non-liquid, pure fats (see page 30)
￭ Samples containing oil and fat (see page 31)
￭ Emulsion fats (see page 33)
￭ Solid samples (e.g. PVC) (see page 34)
Preparing pure, clear oils
Prepare oil that is completely pure and clear as follows:
1 Weighing in the sample
￭ Place the reaction vessel on a scale using a 6.2628.000 holder.
￭ Weigh the sample material directly in the reaction vessel.
Normally, 3 g of sample material are used for vegetable oils.
2 Checking the filling level
￭ Make sure that the quantity of sample material in the reaction
vessel is sufficient so that the air tube is immersed deeply enough.
If this is not the case, add more sample material.
Preparing non-liquid, pure fats
Prepare non-liquid, pure fat as follows:
1 Weighing in the sample
either
￭ Completely liquefy the fat in a water bath or in a drying oven at
a temperature exceeding its melting point by 10 °C.
￭ Place the reaction vessel on a scale using a 6.2628.000 holder.