BrandTech Scientific Transferpette S -8/-12 - Manual (Page 37)

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Checking the Volume
Depending on use, we recommend inspection of the instrument every
3 to 12 months. The cycle can, however, be adjusted to individual
requirements.
The gravimetric testing of the pipette volume is performed according to
the following steps and is in accordance with DIN EN ISO 8655, Part 6.
1.
Set nominal volume
Set volume to the maximum volume indicated on the instrument
(see page 34 for procedure).
2.
Condition the pipette
Condition the pipette before testing by using pipette tips to aspirate and
discharge the test liquid (distilled H
2
O) five times.
3.
Carry out the test
a) Aspirate liquid and pipette it into the weighing vessel.
b) Weigh the pipetted quantity with an analytical balance. (Please follow
the operating manual instructions from the balance manufacturer.)
c) Calculate the volume, taking the temperature of the test liquid into
account.
d) 3-10 pipettings and weighings per channel in three volume ranges
(100%, 50%, 10% of nominal volume) are recommended for statisti-
cal analysis.
According to DIN EN ISO 8655-2, it is recommended to replace the
tips after each measurement. This rule may be waived in accordance
with the DAkkS guideline DKD-R8-1.
Note:
Note:
Each individual channel must be tested separately.
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