Metrohm 787 KF Titrino - Manual (Page 20)

2.3. Tutorial
787 KF Titrino
16
It is now necessary to match the factor to the new result unit. A table with a selection of
matched quantities for factor, divisor and unit of the sample size can be found in the
quick reference.
<CALC DATA>
4 × <ENTER>
<1>
<ENTER>
<ENTER>
2 × <QUIT>
• Enter a new factor: Press <CALC DATA> and enter
the inquiries of the "calculation" group with
<ENTER>. Proceed with 3 times <ENTER> to the
display:
• Enter "1".
• As divisor enter the density of the sample.
• Exit the inquiry by pressing <QUIT> twice. The re-
sult is recalculated and outputted.
2.3.4 Drift
The drift is measured in µL/min. It specifies how much KF reagent is consumed per unit
time to keep the titration cell dry. The reagent is needed,
• to titrate moisture in the titration cell.
• to compensate the iodine consumption of slow side reactions.
The drift value is generally of the order of a few µL/min for "dry conditioned" titration cells.
Checking the condition of the solvent
The drift can be displayed during the conditioning of the titration cell with the <DRIFT>
key:
<DRIFT>
<DRIFT>
• Press <DRIFT>. The first line of the display shows
You can follow the progress of the drift. In fresh solvent
the drift value should drop to less than 10 µL/min after
a few minutes.
• Pressing <DRIFT> once again switches the drift
display off.
KFT volume 3.459 ml
factor 0.1
KFT volume 3.459 ml
divisor 1
Drift 4.3 µl/min