Additional Functions; Cal Mode (Adjustment) - BRAND Titrette 4760141 Operating Manual

11 Additional functions

c.
At 10 pipetting series and weighings in 3 volume ranges (100 %, 50 %, 10 %) are recommended.
d.
Turn the hand wheels with both hands without stopping until the test volume is shown on the
display. Wipe off the tip of titration tube.
e.
Weigh the pipetted amount with an analysis scale. (Please refer to the user manual of the scale
manufacturer.)
f.
Calculate the dispensed volume. The Z factor takes account of the temperature and air buoy-
ancy.
Calculation (for nominal volume)
x = Weighing results
i
Z = Correction factor (e.g. 1.0029 µl/mg at 20 °C, 1013 hPa)
Mean value:
Variation coefficient*:
*) = Calculation for accuracy (A%) coefficient of variation (CV%): A% and CV% are calculated using the
formulas of statistical quality control.
Test instructions (SOPs) are available for download at www.brand.de .
11 Additional functions

11.1 CAL mode (adjustment)

11.1.1 Adjustment
After a long period of usage or following the replacement of the dispensing unit, an adjustment may
be necessary to balance out differences in accuracy up to a maximum of ± 0.999 ml. The change from
the factory setting is shown in the display.
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Operating manual
N = Number of weighings
Mean volume:
Standard deviation*:
NOTICE
V = Nominal volume
0
Accuracy*:
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