Metrohm 877 Titrino plus - Manual (Page 87)

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7 Parameters
877 Titrino plus
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Evaluation and equivalence point criterion with MET
The equivalence points (EPs) are localized by a method based on the For-
tuin method which has been adapted by Metrohm for numerical methods.
A search is made for the largest measured value alteration ( ). The exact
EP is determined by using an interpolation factor which depends on the
Δ values before and after .
: EP volume
: Dosed total volume before
: Volume increment
: Interpolation factor according to Fortuin
For the recognition of the EPs found the set EP criterion is compared with
the ERC (Equivalence point Recognition Criterion) found. The ERC is the
sum of the measured value alterations before and after the jump:
In certain cases only three or only a single summand are taken into
account.
EPs whose ERC is smaller than the defined EP criterion will not be recog-
nized. The ERC is displayed in the results dialog for each discovered and
recognized EP. If you adjust the EP criterion after the fact in order to rec-
ognize more or fewer EPs, then you can initiate the reevaluation in the
results dialog with the [Recalc] key.
7.1.5 Calculation
7.1.5.1 General
Menu ▶ Parameters ▶ Calculation
A maximum of five calculations can be defined in one method. A series of
variables (raw data from the determination, previously calculated results) is
available for the calculations. Definition can be made for each calculation
as to whether the result is to be saved as a titer or as a common variable.