Metrohm tiamo 1.1 Manual User Manual
Page 427
Commands
399
displayed. In order to edit these parameters the value
user
must be se-
lected.
slow
For titrations in which the finest details are also to be visible. However, this
can also increase noise and lead to the production of unwanted EPs.
[ optimal ]
Parameter set for all standard titrations; optimized for the most frequent
applications.
fast
For less critical rapid titrations.
user
Editing the individual titration parameters which affect the titration rate.
Control
(only visible for
Titration rate
=
user
)
Dynamics
0.01 ... [ 40.00 (slow) ] ... [ 10.00 (optimal) ] ... [ 5.00 (fast) ] ... 200.00 µA, off
(Titrando)
0.1 ... [ 40.0 (slow) ] ... [ 10.0 (optimal) ] ... [ 5.0 (fast) ] ... 200.0 µA, 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.