Metrohm 893 Professional Biodiesel Rancimat - Manual (Page 9)

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1 Introduction
893 Professional Biodiesel Rancimat
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1 Introduction
1.1 Instrument description
The 893 Professional Biodiesel Rancimat is a computer-controlled measur-
ing device for determining the oxidation stability of biodiesel and biodiesel
blends (mixture of biodiesel and conventional diesel fuel) according to the
standards EN 14112 and EN 15751.
It is equipped with two heating blocks each with 4 measuring positions.
Each block can be heated individually, i.e., 4 samples can each be mea-
sured at two different temperatures or 8 samples at the same tempera-
ture. The measurements at the individual measuring positions can be
started individually for this.
The 893 Professional Biodiesel Rancimat is controlled by means of the
StabNet computer software and a computer that is connected via the
USB interface. Up to 4 instruments can be controlled and monitored by
each computer, hence allowing a maximum of 32 samples to be analyzed
at the same time. The evaluation algorithm of the computer software
determines the break point of the Rancimat curve and thus the induction
time fully automatically. Besides the induction time, the so-called stabil-
ity time, i.e., the time until a defined conductivity change has been
achieved, can also be determined. In the case of conductivity changes
(stages) which do not have anything to do with the autoxidation, the eval-
uation can be suspended for definite time intervals. The results deter-
mined can be further processed mathematically.
Each Rancimat curve can also be evaluated manually. A computer-sup-
ported tangential method is available for this, in which you can position
the tangents anywhere on your curves. This makes evaluations possible in
extreme cases as well.
The results of the determinations are saved in a database together with all
method and determination data. Determinations can be searched for,
sorted, filtered, exported and printed in the Database program part.
Apart from graphically displaying individual and multiple curves, the soft-
ware is also capable of conducting recalculations with changed parame-
ters and extrapolating the results to a certain temperature.