Metrohm tiamo 1.1 Manual - Manual (Page 469)

Commands 441
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.
rate . 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 re-
mains 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 con-
trol 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.