Pipettor Operation - VWR avantor EHP Instruction Manual

6. Pipettor Operation

Attaching the Tips
• Attach the correct tip corresponding to the model
number displayed on the pipettor pushbutton
(Section 5).
• Position the pipettor vertically when attaching tips.
• Single-channel pipettors: push the pipet tip on firmly
using a slight twisting motion to ensure an airtight
seal.
• Multi-channel pipettors: press the pipettor against the
tips positioned in the rack box until the shaft retracts
approximately 1.5mm into the manifold. The suspen-
sion system ensured even and airtight sealing of the
pipet tips. The rocking motion does not have to be
performed to seal the pipet tips tightly.
NOTE:
• Do not attach the tips with a rocking movement,
as this may damage the shaft or plunger. Observe this
rule particularly with single-channel pipettors of low
volume range.
10 – VWR EHP PIPETTORS
• Never draw liquids directly into the pipettor without
the tip attached.
Adjusting the tip ejector
The tip ejector can be adjusted by the user and can
accommodate most types of tip available on the
market. When using narrow tubes, it may be necessary
to remove the tip ejector.
2-1,000 μL pipettors
1. Tip ejector disassembly
• Press the tip ejector pushbutton.
• Slide the ejector from the plastic arbor.
2. Tip ejector assembly
• Press the tip ejector pushbutton.
• Line the metal tip ejector up with the plastic arbor.
• Slide the ejector on the arbor.
3. Tip ejector adjustment
• Remove the tip ejector pushbutton.
• Remove "H0" spacer that is inserted on the ejector
arbor. To increase the ejector length use "H" spacers,
which allow for regulating the length of tip ejector
by +1 mm (H1) or +2 mm (H2). The outside shape
identifies the spacers.
Instruction Manual – 11