Metrohm 900 Touch Control Manual - Manual (Page 320)

29.2 Monotonic equivalence point titrations (MET)
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900 Touch Control
Measuring mode Upol:
Input range
0.1 - 99.9 µA
Default value 2.0 µA
EP recognition
This parameter allows you to filter out only the equivalence points that are
being sought.
Selection first | greatest | last | ascending | descending
Default value first
first
Only the first equivalence point will be recognized.
greatest
Only the equivalence point with the greatest ERC value, i.e. the steep-
est jump, will be recognized.
last
Only the last equivalence point will be recognized.
ascending
Only equivalence points with a positive slope of the titration curve will
be recognized.
descending
Only equivalence points with a negative slope of the titration curve will
be recognized.
Only one equivalence point will be recognized in a window. The number-
ing of the equivalence points (EP) is defined by the numbering of the win-
dows (e.g. EP2 in window 2), so that even if EPs are missing, the calcula-
tions will still be carried out with the correctly assigned EP volumes.
EP1
EP window 2
EP window 1
EP2
U/mV
V/mL
EP window 1
EP1
+
U/mV
V/mL
lower limit 1
upper limit 1
Figure 15 Equivalence point recognition and equivalence point num-
bering within windows
In the first example in the above figure, two equivalence points are recog-
nized in two different windows (EP1 in window 1 and EP2 in window 2).
In the second example, two equivalence points are found in one window,
but only the first one is recognized. In order to ensure that the user recog-
nizes that more than one equivalence point was found in the set window,