Metrohm 915 KF Ti-Touch - Manual (Page 294)

28.3 Evaluations (EVAL)
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915 KF Ti-Touch
Measuring mode T:
Input range
0.1 - 20.0 °C/s
Default value 1.0 °C/s
28.3.3 Break point evaluation (EVAL BREAK)
A break point evaluation is used to determine sharp changes of direction
in the titration curve. This evaluation is primarily used for photometric and
conductivity titrations. The method is based on the search for extremes in
the second derivative of the curve.
2nd derivative
Break point
Measured value
Volume / Time
Figure 15 Evaluation of a break point
EP criterion
Measure of the minimum sharpness of the break point. The smaller the EP
criterion set, the more break points will be found. As this is a relative value
related to the total measured value modification, even small changes in
the measured value can be evaluated as a break point for a small mea-
sured value range.
Input range 0.0 - 1.0
Default value 0.3
Slope
Minimum difference between the slope before and after the break point.
The smaller the difference, the more break points will be found.
Input range 0.0 - 10.0
Default value 0.9
Smoothing factor
The higher the smoothing factor, the fewer break points will be found.
Input range 2 - 20
Default value 5