Hach-Lange TITRALAB 840_845 Reference Manual - Manual (Page 110)

Titra Lab ® TitraLab 840 and 845 Reference Manual
Page 110
IP filter In the incremental IP titration mode the filter is used to eliminate
background noise which creates false inflection points.
Changing the IP filter has no effect on the measurement points, only
on IP determination and result calculation.
The IP filter will generally be set to 1 (default value). You can increase
this value to eliminate very close IP.
Enter in:
Parameters menu of a Monotonic IP or Dynamic IP method.
Range available:
0 to 4
IP reject The IP reject sets lower level of the slope of the titration curve for
acceptance of an inflection point. Use the IP reject value to eliminate
weak inflection points.
To set the appropriate IP reject value, display the derivative curve of
the titration and find the IP reject value as shown below:
Figure 21: IP reject
Enter in:
Parameters menu of a Monotonic IP or Dynamic IP method.
Range available:
1 to 999 (unit = mV/ml or pH/ml)
IP>1 (result
indicator) Refer to "Result indicators", page 157 .
IP reject 2
d Potential (or d pH)/dVolume
IP reject 1
Volume
IP reject 3
IP reject 4
IP1
IP2
IP3
IP reject 1: 3 Inflection points found (IP1, IP2 and IP3)
IP reject 2: 2 Inflection points found (IP2 and IP3)
IP reject 3: 1 Inflection point found (IP3)
IP reject 4: no inflection point found
Direct curve
Derivative curve