9 GUIDELINES FOR GOOD PIPETTING
Aspirate and dispense
1) Fit new PIPETMAN Tip for the best results (see Chapter 18).
For single channel models, push the tip-holder into the tip
using a slight twisting motion to ensure a firm and airtight
seal.
For multichannel models,PIPETMAN Tips are best fitted from
the patented ROCKY RACK available only in our TIPACKs and
TOWERPACKs. ROCKY RACK is the dome-shaped part of the
pack that contains the tips. ROCKY RACK makes it easy to
securely fit the tips to a multichannel pipette, ensuring an
airtight seal on all channels without the need to use undue
pressure or to touch the tips.
2) Pre-rinse the tip. Pre-rinsing consists of aspirating the first
volume of liquid and then dispensing it back into the same
vessel (or to waste). Subsequent volumes that you pipette
will have levels of accuracy and precision within specifications. Some liquids (e.g. protein-containing solutions and
or
ganic solvents) can leave a film of liquid on the inside the
wall of the tip; pre-rinsing the tip minimizes any errors that
may be related to this phenomenon.
3) Hold the pipette vertically and immerse the tip in the liquid
(see page 13). Press the push-button to aspirate the set volume of liquid. Wait a few seconds (time depends on model,
see page 13); then withdr
aw the pipette-tip from the liquid.
You may wipe any droplets away from the outside of the
tip using a medical wipe, however if you do so take care to
avoid touching the tip’s orifice.
4) Place the end of the tip against the inside wall of the recipient
vessel (at an angle of 10° to 40°). Press the push-button. Wait
for at least a few seconds before releasing the push-button
to expel any residual liquid from the tip. While removing the
pipette draw the tip along the inside surface of the vessel.
5) Eject the tip by pressing firmly on the tip-ejector button.
General guidelines for good pipetting
a. Make sure that you fit new tips.
b. Each new tip should be pre-rinsed with the liquid to be pipetted.
c. When aspirating, keep the tip at a constant depth below the
surface of the liquid (refer to Table).
Immersion Depth and Wait Time
Model Immersion Depth Wait Time
(mm) (seconds)
P10M 1 1
P20M 2-3 1
P100M 2-4 1
P200M 2-4 1
P300M 2-4 1
P1200M 2-4 2-3
P5000M 3-6 4-5
P10 mLM 5-7 4-5
P8x10M, P12x10M 1 1
P8x20M, P12x20M 2-3 1
P8x100M, P12x100M 2-4 1
P8x200M, P12x200M 2-3 1
P8x300M, P12x300M 2-3 1
P8x1200M, P12x1200M 2-4 2-3
d. Change the tip before aspirating a different liquid, sample, or reagent.
e. Change the tip if a droplet remains at the end of the tip from the previous pipetting operation.
f. Liquid should never enter the tip holder. To prevent this:
• Never turn the pipette upside down,
• Never lay the pipette on its side when there is liquid in the tip(s),
g. The Gilson Stand Adapter (see Chapter 2) is recommended for use with the CARROUSEL and SINGLE
Pipette Holder to store your PIPETMAN M pipette in the vertical position. Alternatively the POWER
CARROUSEL can be used to store and charge up to 5 PIPETMAN M pipettes.
h. When pipetting liquids with temperatures different to the ambient temperature, pre-rinse the tip
several times before use in order to reach equilibrium between the temperatures of the liquid and
the pipette’s dead-volume.
i. For volatile liquids you should saturate the dead-volume by aspirating and dispensing the liquid
repeatedly before aspirating the sample.
j. After pipetting acids or other corrosive liquids that emit vapors, clean the pipette, as described in
Chapter 15.
k. The pipette can be used between + 4 °C and + 40 °C, but the
specifications may vary (see Chapter 18).
l. Do not pipette liquids having temperatures above 50 °C or
below 4 °C.
10 PERSONALIZE YOUR PIPETMAN M
Tip-ejector extension for use with P10M
In order to eject D10 tips, tip-ejector extensions are supplied with P10M
pipettes.
The tip-ejector extension which is made of PVDF (polyvinylidene Fluoride),
is autoclavable.
To t a tip-ejector extension:
• Hold the pipette with the push-button upright.
• Hold the extension with the slot upright.
• Slide the extension over the tip-holder.
• Push the extension firmly onto the end of the tip-ejector until it clicks
into place (see opposite).
To remove a tip-ejector extension (see opposite):
• Hold the pipette in one hand and grip the extension with the other.
• Gently twist the extension (either direction) and pull it away from the
pipette.
Short tips Long tips
To fit To remove
Slot
Extreme temperatures
can aect accuracy and
precision!