Maintenance; Cleaning - VWR Ultra High-Performance VE2 Handbuch

CAUTION: The pipetting procedure should be conduct-
ed in accordance with the rules described in sections 3
and 4.
Recalibration procedure:
• Set the dose volume depending on the pipetted volume
according to Table 5.
Range of the
Model pipettors
volumes [μl]
VWR VE2 0.1 - 2
VWR VE10 0.5 - 10
VWR VE20 2 - 20
VWR VE50 5-50
VWR VE100 10 - 100
VWR VE200 20 - 200
VWR VE1000 100 - 1000
Table 5
• Perform 5 aspirations, weigh each one and calculate
the average value of the aspirations.
• Calculate average aspirated volume in [μl] by multiplying
the average aspiration amount [mg] by the distilled
water density coefficient [μl/mg], which depends on
temperature and pressure (Table 4).
• If the average aspirated volume exceeds the permissi-
ble values, pipettor recalibration should be conducted.
Pipettor recalibration consists in setting the real value
obtained during weighing on the counter. To do so, the
following should be conducted:
A
B
Fig. 5
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Preset Permissible
volume volumes
[μl] [μl]
0.2 0.176 - 0.224
0.5 0.48 - 0.52
2 1.92 - 2.08
5 4.875 - 5.125
10 9.84 - 10.16
20 19.76 - 20.24
100 99.1-100.9
C
• Remove the cap (fig. 1D) using the calibration key
(fig. 5A),
• Set the calibration switch (fig. 1E) in its upper position
(fig. 5A),
• Insert the calibration key into the ejector orifice (fig. 1C)
and place it in the calibration screw of the counter
(fig. 5B),
• Turn the key so as the volume indicated by the counter
is equal to the average calculated volume.
• Remove the calibration key and set the calibration switch
in its lower position (fig. 5C), thus going to the pipetting
mode,
• Place the cap of the ejector pushbutton (fig. 5C).
After having conducted the calibration procedure it is
recommended to record recalibration.
CAUTION: Do not rotate the volume adjustment knob
during calibration (fig. 1B).

6. MAINTENANCE

The pipettor requires periodic maintenance, depending
on the applications performed and intensity of use. The
subassemblies subject to action of aggressive solution
vapours, such as shaft elements, should be regularly
inspected and cleaned.
To conduct correct maintenance procedure, familiarise
yourself with the structure of the shaft set described in
section 8 and observe the instructions given in this section.
WARNING!
Do not use sharp tools during the maintenance. It may
damage the device and impair your safety.

6.1. CLEANING

External surfaces of the handgrip, knob and pushbuttons
may be cleaned with a tissue dipped in isopropyl alco-
hol. The remaining elements removed from the pipettor
during disassembly can be washed with distilled water or
isopropyl alcohol.
CAUTION:
Use of cleaning solutions not recommended by the manu-
facturer may impair the safety of the user and damage
the device.
ENGLISH
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