Metrohm 900 Touch Control Manual User Manual Page 321

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29 Parameters
900 Touch Control
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305
EP1 is marked with a "+" in the result view. In addition, a corresponding
message is entered in the message list.
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 modification ( ). 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 modifications 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 later in order to recognize
more or fewer EPs, then you can reevaluate the determination ([Recalcu-
late] function in the results dialog).
29.2.5 Control device
The control device the determination is carried out with is selected under
[Control device]. Control devices are defined under System Device
manager.
NOTE
This button is only displayed when several control devices have been
configured.
Control device
Selection of the control device from the list of devices. Only those devices
are displayed which are able to carry out the command. The control devi-
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