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4 Operation
892 Professional Rancimat
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27
Figure 15 Measuring arrangement (schematic representation)
1
Reaction vessel
2
Sample
3
Heating block
4
Measuring vessel
5
Conductivity measuring cell
6
Measuring solution
4.2 Calibration functions
4.2.1 Determining the cell constant
The cell constant of the conductivity sensor (6.0913.130) is normally at
1.1 ± 0.1 cm-1. This accuracy is sufficient for an induction time determi-
nation since only the shape of the curve is evaluated. For the determina-
tion of the stability time, however, the conductivity change is measured
in absolute terms. As a rule, the time until an increase in conductivity of
50 µS/cm is determined. The cell constant for the conductivity electrode
being used has to be calibrated in order to be able to measure the con-
ductivity correctly.
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