Metrohm 726 Titroprocessor - Manual (Page 140)

8.2 DET
726 Titroprocessor, Instructions for use 134 134
Time recording
Recording measuring time
on | off
To record the titration curve on the axis of time (measured
value against time) the time recording function has to be
switched on. It can be switched off for recording the titra-
tion curve on the axis of volume. This keeps the determin-
ing files smaller, as less measured values are recorded and
filed.
U(pol)
Polarization voltage (DET_UPOL* only)
-1270…400…1270 mV
The polarization voltage is the voltage which is applied to a
polarized electrode during the amperometric titration. The
measuring quantity µA is obtained.
I(pol)
Polarization current (DET_IPOL* only)
-127…1…127 µA
The polarization current is the current that is applied to a
polarized electrode during the voltametric titration. The
measuring quantity mV is obtained.
Stop conditions
The stop conditions define when and how a titration should be terminated.
In the same way as for the definition of the start conditions, the attainment of
any one of the stop criteria leads to the discontinuation of titration. Here,
too, combinations are possible and are indeed preferable.
Volume
Definition of the stop volume
absolute | relative| off
The stop volume can be entered as an absolute volume, or
as a relative volume as a function of the sample size. Vari-
ous other fields* will need to be edited depending on what
is entered in this field (see below). Attainment of the stop
volume leads to discontinuation of the titration.
Size
** Absolute volume (with abs. stop volume)
0…99.99…999.99 mL
It is preferable to select an absolute stop volume when the
primary objective is to prevent the titration vessel from
overflowing.
Factor
** Calculation factor (with rel. stop volume)
–99999…0…99999
The actual volume of the stop volume is calculated from:
Volume in mL = sample size
∗∗ factor .