Metrohm tiamo 1.2 Manual - Handbuch (Seite 470)

444 Method
Min. rate
0.01 ... [ 5.00 (50 µL/min)] ... [ 10.00 (100 µL/min) ] ... [ 40.00 (500 µL/min) ]
... 9999.00 µL/min
Speed of addition at the start and finish of the titration. The slower the
minimum rate that is selected, the slower the titration and the higher the ac-
curacy. the longer it takes until the control point is reached for the first time.
The following rule of thumb should be considered in order to obtain as con-
stant a dosing at the control point as possible:
Min. rate in µL/min = Ex-
pected rate of reaction in µL/min / 10.
Note
Outside the control range the dosing rate is mainly characterized by the
Max. ra-
te . The parameters Max. rate and Dynamics should be optimized together in such
a way that the titration does not overshoot too much when reaching the control
point. The control range should be set so that the measured value remains
within this range while it is kept constant. A slightly larger control range should
be defined for slow reactions (e. g. U = 180 mV). A SET pretitration is frequently
used to reach the control point before the substrate is added. This means that
the STAT titration can be started with a small variation from the control point.
Within the control range the dosing rate is mainly characterized by the
Min. rate .
Titration parameters
Parameters defining the run of the titration.
Command name
25 characters, [ STAT U # ]
Name of the command.
Titration direction
Selection of the titration direction.
+
Positive measured value alteration.
[ - ]
Negative measured value alteration.
auto
The titration direction is determined automatically from the start measured
value and the set control point.
Temperature
-20.0 ... [ 25.0 ] ... 150.0 °C (Titrando)
-170.0 ... [ 25.0 ] ... 500.0 °C (Titrino)
Manually entered titration temperature. If a temperature sensor is con-
nected and the
Temperature measurement in the tab General/Hardware under