BRAND Transferpette S-8 Instrucciones De Manejo página 54

5 Checking the volume
b. Weigh the pipetted amount with an analysis scale. (refer to the oper-
ating manual of the balance manufacturer.)
c. Calculate the pipetted volume. In doing so, take into account the tem-
perature of the test liquid.
d. At least 10 pipetting series and weighings in 3 volume ranges (100%,
50%, 10%) are recommended. Two tips must be used for each volume
range to be tested.
Calculation (for nominal volume)
x = weighing results
i
Z = Correction factor (e.g. 1.0029 µl/mg at 20°C, 1013 hPa)
Mean:
Coefficient of variation*:
100 s
CV% =
V
*) Accuracy and coefficient of variation are calculated according to the
formulas of statistical quality control.
Test Instructions (SOPs) are available for download from
Operating manual
54
n = number of weighings
Mean volume:
Standard deviation*:
NOTICE
V = nominal volume
0
Accuracy*:
– V
V
0
A% =
* 100
V
0
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Transferpette® S-8/-12 997208
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