Metrohm 796 Titroprocessor - Manual (Page 170)

8.6 KFT
796 Titroprocessor, Instructions for use 164 164
Volume
Definition of the stop volume
absolute | relative | off
The stop volume can be entered as an absolute volume or
as a relative volume, depending on the sample weight. De-
pending on the entry in this field various other input fields
may need to be edited (see below). When the stop volume
is reached the titration is ended.
Size
* Absolute volume (with abs. stop volume)
0…99.99…999.99 mL
The selection of an absolute stop volume is preferred when
the main consideration is ensuring that the titration vessel
does not overflow.
Factor
* Calculation factor (with rel. stop volume)
–99999…0…99999
The effective value for the stop volume is calculated from:
Volume in mL = Sample size
∗∗ Factor .
The selection of a relative stop volume is preferred when
the main consideration is to limit titrant consumption.
Fill. rate
Buret filling speed
0.01 mL/min…150 mL/min | max.
At the end of a titration the buret is automatically filled. The
maximum value for the filling rate 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
buret cylinders; however, when the method is carried out
the dosing speed will automatically be reduced to the larg-
est possible value. For KF reagents (viscous liquids) no
filling rate greater than 30 mL/min should be selected as
otherwise too rapid filling may cause a partial vacuum in
the cylinder (bubble formation!).