Metrohm 900 Touch Control Manual - Manual (Page 305)

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29 Parameters
900 Touch Control
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V
E
pH
V/mL
Figure 14 Tubbs method for determining the equivalence point
The figure shows that the evaluation also requires measured values from
the measuring point list after the equivalence point as well.
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
first derivative of the titration curve combined with a mathematical func-
tion which is more sensitive for flat jumps than for steeper ones. EPs
whose ERC is smaller than the defined EP criterion will not be recognized.
The ERC is displayed in the results dialog for each discovered and recog-
nized EP. If you adjust the EP criterion later in order to recognize more or
fewer EPs, then you can reevaluate the determination ([Recalculate]
function in the results dialog).
29.1.5 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-
ces do not have to be connected. This allows to transfer methods more
easily from one system to another.
Selection Selection of configured control devices