Metrohm 874 USB Oven Sample Processor - Manual (Page 32)

3.11 Inserting the heating tube into the KF titration cell ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
24 ￭￭￭￭￭￭￭￭ 874 Oven Sample Processor
4 Fasten the 6.1464.320 coulometric KF titration cell to the titra-
tion vessel holder. Hook the metal clip of the titration cell to the
holder.
The height of the titration vessel holder can now be adjusted in such
a way that the titration vessel hangs slightly above the magnetic stir-
rer. Use the clamping ring to fix the position of the holder. If the fix-
ing lever of the holder is now pressed, then the titration cell can be
raised slightly and swiveled. The correct positioning of the titration
cell continues to be maintained by the clamping ring.
5 Insert the 6.0345.100 generator electrode (or 6.0344.100) into
the titration cell and connect a 6.2104.120 electrode cable to it.
6 Insert the 6.0341.100 indicator electrode into the titration cell
and connect a 6.2104.020 electrode cable to it.
7 Fill a 6.1403.030 KF adsorber tube with 6.2811.000 molecular
sieve. Place a small piece of absorbent cotton underneath and above
the molecular sieve to serve as a dust filter. Insert the filled drying
tube into the titration cell.
8 Place a 6.1903.030 stirring bar into the titration cell.
3.11 Inserting the heating tube into the KF titration cell
The 874 Oven Sample Processor can be used in combination with a KF
coulometer or a volumetric KF titrator. The mounting of the tip of the
heating tube is accomplished in different ways for the respective KF titra-
tion cells.
Coulometric KF titration cell
￭ Remove the protective cover from the tip of the heating tube and the
E.3010.032 O-ring.
￭ Disassemble the accompanying 6.1446.170 heating tube stopper
into three parts.