Metrohm 840 PC Control 5.0 / Touch Control - Manual (Page 260)

4.5 Calculations
248
PC Control / Touch Control
4.5.6 Conversion table of the calculating formula for KF titrations
[ ]
divisor size sample
factor titer blank reagent) - volume(KF
content water
⋅
⋅ ⋅ −
=
Result unit Sample size in... Factor Divisor
% g 0.1 1
% mg 100 1
% mL 0.1 Density of sample in
g/mL
ppm g 1000 1
ppm mL 1000 Density of sample in
g/mL
ppm μ L 1 Density of sample in
g/mL
mg/mL g Density of sample in
g/mL
1
mg/mL mL 1 1
mg 1 1 1
mL 1 1 Density of H
2
O in
mg/mL
mg/pc pc 1 1
4.5.7 Calculable variables
The following table lists all those variables which can be used in calcu-
lations. When editing the formula you can either enter the variables di-
rectly or select them from the list of variables under Calc. for-
mula/Variables and then insert them in the formula. For variables
which contain an index (e. g. EP1) the index must be entered manually.
The index is always given in the selection list as #.
If the method sequence contains more than one data producing com-
mand (titrations, measurements, calibrations, monitored dosing,
evaluations, calculations) before the calculation then you can insert the
command identification by using the following buttons in the formula
editor: 'M.' (titration or measuring mode or monitored dosing), 'E.'
(EVAL) and 'C.' (CALC). You must enter the index for the command in
front of the letter. If the variables are entered without command identifi-
cation then the variables from the last command before the CALC
command to provide the corresponding variables will always be used.
A safer method is to insert the variables from the list of variables, as
only the variables produced in the determination are available. The vari-