Metrohm 757 VA Computrace Manual de usuario descargar pdf (Pagina 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.

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Metrohm 757 VA Computrace Manual de usuario Pagina 134