29
10.4. Storage
When not in use it is recommended that the pipettor is always stored in the
e
LINE Charging Stand or Carousel. However, during long storage periods
(several months) it is recommended to disconnect the Charging Stand and
Carousel from the mains outlet.
It is also advisable to remove the battery pack from the pipettor. This protects
the batteries against discharging during the long storage period.
11. Performance Testing
It is recommended to check the performance of your Biohit
e
LINE pipettors
regularly (e.g. every 3 months) and always after in-house maintenance.
However, users should establish a regular testing routine for their pipettors
having regard to the accuracy requirements of the application, frequency of
use, number of operators using the pipettor, nature of the liquid dispensed and
the acceptable maximum permissible errors established by the user. (ISO 8655-1.)
Performance test should take place in a draught-free room at 15–30
O
C,
constant to ±0.5
O
C and relative humidity above 50%. The pipettor, tips and the
test water should have stood in the test room sufficient time (at least 2 hours)
to reach equilibrium with the room conditions. Use distilled or de-ionised water
(grade 3). Use an analytical balance with a readability of 0.01 mgs.(ISO 8655-6.)
Weighting:
1.
Adjust the desired test volume V
s
.
2.
Carefully fit the tip onto the tip cone.
3.
Fill the tip with test water and expel to waste five times to reach a humidity
equilibrium in the dead air volume.
4.
Replace the tip. Pre-wet the tip by filling it once with the test water and
expel to waste.
5.
Aspirate the test water, immersing the tip only 2–3 mm below the surface
of the water. Keep the pipettor vertical.
6.
Withdraw the pipettor vertically and touch the tip against the side wall of
the test water container.
7.
Pipette the water into the weighing vessel, touching the tip against the
inside wall of the vessel just above the liquid surface at an angle of 30
O
to
45
O
. Withdraw the pipettor by drawing the tip 8–10 mm along the inner wall
of the weighing vessel.
8.
Read the weight in mgs (m
i
).
9.
Repeat the test cycle until 10 measurements have been recorded.
10. Convert the recorded masses (m
i
) to volumes (V
i
) by multiplying the mass
with the correction factor Z (Z-values in the table below):
V
i
= m
i
*Z
Содержание eLINE 73002X
Страница 36: ...36 Notes...
