Metrohm tiamo 1.2 Manual - Handbuch (Seite 412)

386 Method
user
Editing the individual titration parameters which affect the titration rate.
Control
(only visible for Titration rate = user )
Dynamics pH
0.001 ... [ 5.000 (slow) ] ... [ 2.000 (optimal) ] ... [ 0.500 (fast) ] ... 20.000, off
(Titrando),
0.01 ... [ 5.00 (slow) ] ... [ 2.00 (optimal) ] ... [ 0.50 (fast) ] ... 20.00, off (Titrino)
Dynamics defines the measured value range before the given endpoint.
This parameter has an important influence on the titration rate and with it on
the accuracy. Within the control range the steps which are added are con-
trolled by the
Min. rate . The nearer the endpoint the slower the dosing takes
place until the Min. rate has been reached. Outside the range the dosing
takes place with Max. rate ) (see Control range).
Max. rate
0.01 ... [ 1.00 (slow) ] ... [ 10.00 (optimal) ] ... 166.00 mL/min, [ maximal (fast) ]
(Titrando)
0.01 ... [ 1.00 (slow) ] ... [ 10.00 (optimal) ] ... 150.00 mL/min, [ maximal (fast) ]
(Titrino)
Speed of addition outside the control range. The maximum dosing speed
depends on the cylinder volume of the exchange unit or dosing unit used.
Min. rate
0.01 ... [ 5.00 (slow)] ... [ 25.00 (optimal) ] ... [ 50.00 (fast) ] ... 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.
Stop criterion
Stop criterion
[ drift ], time, off
The titration stops when the endpoint has been reached and the stop crite-
rion has been fulfilled. The titration can be stopped when a particular
drift
has been achieved or after a preset time . If no stop criterion has been se-
lected the titration will not be stopped. In older instructions the Delay time
was usually defined as the Stop criterion . The stop criterion time means that
the endpoint must be exceeded for a certain time: the Delay time . The same
Delay time with different very small volume increments (depending on the
volume of the exchange or dosing unit) means different switch-off points. In
contrast, if
drift is used as the stop criterion then the switch-off point will al-
ways have the same curve slope dV/dt.
Note
The Stop conditions will always stop the titration even if the stop criterion has not
been fulfilled or has been turned off.
Stop drift
1 ... [ 20 ] ... 999 µL/min
If the EP and the stop drift have been reached the titration will be stopped.
This parameter is only shown for
Stop criterion = drift .
Delay time
0 ... [ 10 ] ... 999 s (Titrando)
0 ... [ 10 ] ... 999 s, inf. (Titrino)
If the EP has been reached, after the last dosing the delay time here de-
fined is awaited and then the titration is stopped. This parameter is only
shown for
Stop criterion = time . inf. stands for infinite.