Metrohm 796 Titroprocessor - Manual (Page 166)

8.6 KFT
796 Titroprocessor, Instructions for use 160 160
Start conditions
Here the conditions which must be fulfilled for the start of the titration are
defined.
Waiting times (Pause1 and Pause 2) can be programmed before and after
the addition of a defined start volume (absolute or relative volume depend-
ing on the sample weight). The minimum duration of a
KFT titration as a
whole can be defined with the extraction time.
Volume
Definition of start volume
absolute | relative | off
The defined start volume can be entered as an absolute
volume or as a relative volume depending on the sample
weight (this is recommended). Depending on the entry in
this field various other input fields need to be edited (see
below). The effective added volume is stored in the system
variable
SV and is available for calculations.
Size
* Absolute volume (with abs. start volume)
0…999.99 mL
When entering an absolute start volume care must be taken
that the start volume is kept small enough so that a suffi-
ciently large volume range is available up to the endpoint
for the dynamically controlled titration.
Factor
* Calculation factor (with rel. start volume)
–99999…0…99999
The effective value for the volume of the start volume addi-
tion is calculated from:
Volume in mL = Sample size
∗∗ Factor .
The maximum start volume which can be added is 1000
mL. If a larger value is obtained from the calculation then
the start volume will be automatically reduced to 1000 mL.
Dos. rate
Dosing speed for preliminary dosing
0.01 mL/min…150 mL/min | max.
The maximum dosing rate value depends on the cylinder
size of the buret used.
Buret cylinder max. speed
1 mL 3 mL/min
2 mL 6 mL/min
5 mL 15 mL/min
10 mL 30 mL/min
20 mL 60 mL/min
50 mL 150 mL/min
A value up to 150 mL/min can also be entered for smaller