Metrohm tiamo 2.3 Patch 1 (process analysis) - Manual (Page 584)

5.6 Commands ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
568 ￭￭￭￭￭￭￭￭ tiamo 2.3 Patch 1 (for Process Analysis)
Conductivity evaluation (MET Cond)
The first step to evaluation is a rough localization of the equivalence point.
A line will then be approximated at each of the two curve branches (to
the left and right of the equivalence point), in each case at the longest
straight curve section. The volume of the equivalence point is output as
the equivalence point volume, while the equivalence measured value is
interpolated on the basis of the volume from the measuring point list.
If more than one equivalence point is expected, then windows must be
defined for the evaluation (for the consumed volume of the titrand around
the equivalence point). The window limits may not however be set too
narrowly for the window evaluation, because both the rough localization
of the equivalent point and the equivalence point that is determined must
lie within the range defined by the two limits. The adjustment of the lines
of intersection, even on the longest straight curve section, can however
extend beyond the window limits.
The algorithm recognizes only left-hand sharp bends and no right-hand
sharp bends (the terms left and right are in this connection in reference to
the movement along the curve with increasing volume).
Commands
Depending on the measured value one of the following MET commands
can be selected:
￭ MET pH
Potentiometric pH measurement with pH electrodes (measured quan-
tity pH).
￭ MET U
Potentiometric voltage measurement with metal electrodes (measured
quantity voltage U).
￭ MET Ipol
Voltametric measurement with selectable polarization current (meas-
ured quantity voltage U).