Metrohm tiamo 1.2 Manual - Handbuch (Seite 438)

412 Method
Note
You can use the Delay time to calculate the maximum Stop drift to be used in the
following way: the size of the last added increment depends on the volume of
the attached exchange unit. With a 20 mL exchange unit (10'000 pulses per cy-
linder volume; for KFT command is independent of the dosing drive) the smal-
lest possible increment is 2 µL. With a Delay time of 5 s the last 2 µL of reagent
must therefore suffice for 5 s or longer. This gives a drift of ≤ 2 µL/5 s ≤ 24
µL/min. (The drift may be smaller than 24 µL/min as we do not know whether the
last increment would also have been sufficient for 10 s.) This means that if you
use a 20 mL exchange unit (10'000 pulses per cylinder volume; independent of
the dosing drive) and 5 s switch-off delay then you should set a value of ≤ 24
µL/min as the stop drift.
Stop time
1 ... 999999 s (only 720, 736, 751, 758, 784, 795, 799)
The titration is stopped if the defined stop time has elapsed. This parameter
is only shown for
Stop criterion = time and Delay time = inf. .
Titration parameters
Parameters defining the run of the titration.
Command name
25 characters, [ KFT Ipol # ]
Name of the command.
Titration direction
Selection of the titration direction. If two endpoints are set the direction is al-
ready given and the following selection is ignored.
+
positive measured value alteration
[ - ]
negative measured value alteration
auto
The titration direction is determined automatically from the start measured
value and the set endpoint.
Extraction time
[ 0 ] ... 999999 s
The titration is not stopped until the extraction time has elapsed (even when
the EP has already been reached). For example, the entry of an extraction
time is a good idea for the titration of sparingly soluble samples.
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
Sensor is set to automatic or continuous then the temperature will be meas-
ured continuously.