Owner's manual
Table Of Contents
- Table of contents
- Table of figures
- 1 Introduction
- 2 Overview of the instrument
- 3 Installation
- 4 Operation
- 4.1 Fundamentals of operation
- 4.2 Instrument and Program Settings
- 4.3 Program information
- 4.4 Calibration functions
- 4.5 Methods
- 4.6 Determinations
- 4.6.1 Preparing samples
- 4.6.2 Preparing the instrument and the accessories
- 4.6.3 Preparing the determination
- 4.6.4 Starting the determination
- 4.6.5 Cleaning the instrument and accessories
- 4.6.6 Adjusting the method parameters during the determination
- 4.6.7 Stopping the determination manually
- 4.6.8 Status of the live curve
- 4.7 Results
- 4.8 GLP functions
- 5 Handling and maintenance
- 6 Troubleshooting
- 7 Technical specifications
- 8 Conformity and warranty
- 9 Accessories
- Index
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4 Operation
743 Rancimat
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79
Preparing emulsion fats
You can use water-soluble fats as pure substances and prepare them as
follows:
1
Weigh in the sample
￭ Weigh in the sample.
Note
As the water evaporates right at the beginning of the analysis and
is carried away by the air blown through, you have to use corre-
spondingly more sample material.
2
Mount foam barrier
￭ Mount the foam barrier (see figure 5, page 14), as the samples
can significantly foam.
Note
If the water-soluble fat samples are not immediately measured
out, you need to store the samples in a cool place and protec-
ted from light; for storing the samples, they should be covered
over in their vessels with a nitrogen layer. This type of storage
does not provide complete protection against unintended and
uncontrolled changes in the oxidation stability, but represents a
usable preservation in many cases.
Alternatively you can melt out the emulsion fats (e.g. butter, margarine) at
a temperature, exceeding the melting point of these fats by 10 °C (i.e. at
approx. +50 °C), centrifuge them and pipette off the resultant oil phase.
4.6.2 Preparing the instrument and the accessories
The cleanliness of instrument and accessories is an indispensable prerequi-
site for reliable, reproducible and correct analysis results. Even the
slightest contamination could catalytically accelerate the oxidative decom-
position and lead to completely incorrect results. Therefore always observe
the instructions for use of measuring and reaction vessels in this section.