Xylem TitroLine 7500 KF Mode D'emploi page 147

4.6.3.4 Formulae for the Preparation of Solutions
A selection of special calculation formulae is available for the Prepare Solutions mode.
The appropriate calculation formula is selected on the «Formula Selection» submenu (Fig. 89).
Fig. 89
A selection of 3 different calculation formulae is available:
W*(100-Fa-Fb)*Fc/Fd - W*(100-Fb)/(100*Fe) +Ff
W*(100-Fa-Fb)*(Fd/Fg) - W*(100-Fb)/(100*Fg) +Ff
W*(100-Fa-Fb)*Fc/(100*Fd)
Meaning of the individual factors:
W: Weight of the sample in g
Fa: Soluble foreign-matters portion in %
Fb: insoluble foreign-matter portion in %
Fc: Conversion factor for it unit
g/l
mg/l und ppm
g/100 ml
%
Fd: Target concentration of the solution to be prepared in g/l, mg/l (ppm), g/100 ml, or %
Fe: Specific weight of the weighed-in sample in g/cm³
Ff: Volume correction in ml. this volume correction is the required surplus dosage for compensating the volume
contraction and the specific-weight difference between the sample weight and the solvent (please observe the note
on volume correction)
Fg: Specific weight of the solvent used in g/cm³
Note on volume correction:
The user has to decide on a case-by-case basis whether a volume correction is necessary and according to
which procedure this correction is to be performed. As a rule, this volume correction may be omitted in the case
of solutions with very low percentages of diluted substance.
= 10
= 10000
= 1
= 1
147