Formula calculation – Metrohm 757 VA Computrace User Manual
Page 134
5 Determination mode
757 VA Computrace – Software
124
• Determining the working range
The calibration curve is defined only for the range between
the calibration solutions with the lowest and highest mass
concentrations. Extrapolations outside this range are not al-
lowed.
• Keep temperature constant
Owing to the large temperature dependence of the measured
values (≥ 2%/°C), it is advisable to work with the 6.1418.220
thermostatted measuring vessel.
• Consideration of blank values
Any blank values must be determined separately and sub-
tracted by means of the formula in the
CALCULATION
window.
Formula calculation
The last step in the evaluation is the calculation of the calculation
formulae entered in the
CALCULATION
window for the output of
the Final results:
Without changing the default values for
Multiplier
,
Divisor
, and
Summand
, the
Final Result
is calculated as the
mass concentra-
tion multiplied by the
Cell volume
and divided by the
Sample
amount
. The final result has the
Final unit
selected in the
CALCULATION
window.