MULTICHANNEL
Labnet International, Inc.
MULTICHANNEL
A
A1
A2
C
B
F
D
H
E
MULTICHANNEL
4A 4B 4C 4D
G
MULTICHANNEL
CONTENTS
1 - INTRODUCTION
2 - VOLUME SETTING
3 - METHOD OF PIPETTING
4 - RECOMMENDATIONS
5 - RECALIBRATION
6 - CLEANING AND STERYLIZATION
7 - PIPETTE KIT AND ACCESSORIES
8 - SPARE PARTS
1 - INTRODUCTION
The BioPette™ series of adjustable multichannel
pipettes have been designed for the filling of laboratory microplates. The pipettes enable precise
and simultaneous delivery of 8 or 12 preset-volume doses of liquid.
BioPette™
pipettes are
produced in four ranges of volumes: 1-10 µl,
5-50 µl, 20-200 µl, 50-300 µl.
The BioPette™ pipettes are equipped with a digital
counter which shows the pipetting volume.
The set volume is visible in the window on the
handle. The setting of the volume is done by tur
ning of the pipetting pushbutton knob (Fig. 1A2)
or by turning of the black knurled adjustment
knob (Fig. 1B) in the right direction. The volume
range is shown on the pipetting pushbutton
(Fig. 1A1).
BioPette™
pipettes should be used with polypropylene disposable tips, to ensure safety and
accuracy, (Fig. 1H). The shafts without O-rings
ensure the compatibility of the pipettes with a
broad assortment of tips, and the special ejector
shape reduces the force required for their ejection. In order to protect the user against inadvertent contact with used tips, the pipettes are
equipped with tip ejectors, (Fig. 1F). By turning
the multichannel module clockwise in relation
to the handle, (Fig. 2), it is possible to disable
the ejector’s operation in order to avoid accidental use, or to change its position in such a
way as to make filling of microplates more convenient.
1 2
The specifications for accuracy and precision
given in the following table are obtained using
Labnet
tips. These figures are only guaranteed
Labnet
when
BioPette 8
Model
BPE-10 5 ±4.0 ± 2.0
BPE-50 25 ±3.0 ± 1.2
BPE-200 100 ±1.5 ± 0.8
BPE-300 150 ±1.2 ± 1.0
BioPette 12
Model
BPT-10 5 ±4.0 ± 2.0
BPT-50 25 ±3.0 ± 1.2
BPT-200 100 ±1.5 ± 0.8
BPT-300 150 ±1.2 ± 1.0
tips are used.
channel
SPECIFICATIONS
Volume Accuracy Precision
[µl] [%] [%]
Min 1 ±8.0 ± 6.0
Max 10 ±2.0 ± 1.2
Min 5 ±4.0 ± 2.5
Max 50 ±1.6 ± 0.6
Min 20 ±3.0 ± 1.5
Max 200 ±1.0 ± 0.6
Min 50 ±1.6 ± 1.5
Max 300 ±1.0 ± 0.6
channel
SPECIFICATIONS
Volume Accuracy Precision
[µl] [%] [%]
Min 1 ±8.0 ± 6.0
Max 10 ±2.0 ± 1.2
Min 5 ±4.0 ± 2.5
Max 50 ±1.6 ± 0.6
Min 20 ±3.0 ± 1.5
Max 200 ±1.0 ± 0.6
Min 50 ±1.6 ± 1.5
Max 300 ±1.0 ± 0.6
These specifications are obtained in forward
mode, using a gravimetric method with the temperature of the distilled water, tips and all other
conditions stabilized between 19°C and 21°C.
The values given include all components of
error due to both normal hand warming and
changing of the tips.
Performance tests: The pipette is calibrated in
accordance with EN ISO 8655. Performance
can be verified by checking the pipette using
MULTICHANNEL
the procedures outlined in the EN ISO 8655
standard.
The pipette design enables the user to perform
the recalibration process according to the rules
presented in section 5.
If the knob is accidentally turned too far, ie is
set lower than the required value, the process
must be repeated. The approach to the set volume must always be made in the order of
decreasing value.
2 - SETTING THE VOLUME
Volume is set using the pipetting pushbutton
(Fig. 1A2) or
while the value is shown
black adjustment knob (Fig. 1B),
on the digital counter.
The volume shown by the counter is represented
by three digits which should be read from top to
bottom. Typical readings are shown in the following table:
Model
BPE-10
BPT-10
BPE-50
BPT-50
BPE-200
BPT-200
BPE-300
BPT-300
Counter
readings
0
3
5
0
6
5
0
8
5
2
5
0
Set
volume
3.5 µl
6.5 µl
85.0 µl
250.0 µl
Increments
0.02 µl
0.10 µl
0.20 µl
1.0 µl
To attain the maximum accuracy, set volume
must be approached from a higher value. If the
desired value is lower than the previous value,
simply use the knob in the pushbutton (Fig. 1A2)
or the black adjustment knob (Fig. 1B) to adjust
the value down to 1/3 turn above the required setting. If the desired value is higher than the previous value, use the knob in the pushbutton or the
black adjustment ring to adjust the value to 1/3
turn above the required value. The setting should
then be performed in the following manner:
With the volume set to 1/3 above the required
setting, slowly turn the pipetting pushbutton
knob or the black adjustment knob to the
required volume.
3 - METHOD OF PIPETTING
Fit the tips onto cones of the multichannel module.
In order to put tips on the multichannel shafts
hold the pipette vertically and press it against
the tips in the rack box, until the shafts
about 1.5 mm into the multichannel module.
retreat
The
suspension system of the shafts ensures even
and tight sealing of tips. The rolling movement
does not have to be performed to seal the tips
tightly. The liquid aspirated into the tips should
not flow out by gravity from properly fixed tips.
While holding the pipette in a vertical position,
tips should be immersed in the liquid to a depth
of 2-4 mm, and flushed once by drawing a dose
of liquid and dispensing it out with slow and
steady movement.
Next, still holding the pipette vertically, the operator should press the pipetting button until the
first resistance point is felt, and immerse the tips
in the liquid to the depth of 2-4 mm, (Fig. 3B).
Releasing the pipetting button with a slow and
uniform movement during 2-3 seconds, the liquid
should be drawn into the tips, (Fig. 3B) which
should then be lifted above the liquid’s surface.
The pipette should next be positioned at an
angle of 10-45 degrees in relation to inner walls
of destination vessels and tips should
be emptied by pressing the pipetting button
slowly until the first resistance point is felt,
(Fig. 3C). After waiting one second, the pipetting
button should be pressed to the second resistance point in order to expel remaining liquid,
(Fig. 3D). Then tips should be lifted out from the
vessels while maintaining contact between
the ends of the tips and the inner walls of the
vessel until the pipetting button has been relased, (Fig. 3E). Finally, pressing the ejector button, the operator should separate the tips from
multichannel module’s cones, (Fig. 3F).
3 4
MULTICHANNEL
4 - RECOMMENDATIONS
To achieve maximum safety, precision and reliability, the following principles should be observed:
• do not draw liquids without tips fitted on the
pipette cones,
• do not lay down the pipette with tips filled,
• do not draw volumes of liquid exceeding the
pipette’s range,
• check if the tips are fitted properly,
• during operation, the pipette must be held vertically, tips should be immersed in liquid
to the depth of 2 to 4 milimeters and the pipetting button should be depressed and released
slowly and evenly,
• new tips must be pre-rinsed prior to pipetting,
by drawing and expelling the liquid to be measured. This is especially important when working with liquids of viscosities and densities
different from that of water and in temperatures different from ambient temperature,
• when pipeting liquids which tend to wet walls
of tips, such as serums, proteins or organic
solvents, measuring must be performed much
slower than with other liquids,
tips must be replaced with new ones, when
•
changing from one liquid to another, or if drops
of liquid remain inside the tips,
• after work, the pipette should be stored vertically in a holder with tips removed.
5 - RECALIBRATION
BioPette™
method, using
pipettes are calibrated by gravimetric
Labnet
tips and distilled water, at
the temperature 20±1°C, according to EN ISO
8655 standard.
If during pipette operation you find that the
accuracy error (the difference between the real
aspirated volume and the preset volume)
exceeds the permissible value given in the table
in section 1, the pipette recalibration procedure
should be carried out.
Before starting the recalibration it is necessary
5
to check whether the following requirements
have been fulfilled during error determination:
• the ambient temperature, and the temperature
of the pipette, tips and water was identical
• the density of the liquid used is close to that
of distilled water
a balance with appropriate sensitivity has been
•
used
Volume checked
0.1 - 10
10 - 100
> 100
[µl]
Balance sensitivity
≤ 0.001
≤ 0.01
≤ 0.1
[mg]
• mg/µl conversion factor has been taken into
account
•the requirements given in sections 3 and 4
have been fulfilled
If the above conditions are satisfied and the accuracy error for selected volume given in section 1
exceeds the permissible value, the pipette
recalibration procedure should be carried out.
The recalibration can be performed within one
full turn of the key to the right or to the left only.
Recalibration conditions:
• Ambient temperature and the temperature of
the pipette, tips and liquid should be within
the range 20-25°C and stabilized during weigh-
within ±0.5°C
ing
•Measurements should be conducted using
distilled water
• Balance sensitivity should be suitable for the
volume to be controlled
Recalibration procedure:
• Set the dose volume depending on the pipette
volume according to the following table:
Range
of the pipette
volumes [µl]
1 - 10
5 - 50
20 - 200
50 - 300
Preset
volume
[µl]
1
5
20
50
Permissible
volumes
[µl]
0.92 - 1.08
4.8 - 5.2
19.6 - 20.4
49.2 - 50.8
Volume change ∆V for
full turn of the calibra-
tion key [µl]
(24 increments)
0.33
1.67
6.30
10.00
6
MULTICHANNEL
•Perform three aspiration series (each series
should include the aspirations from all channels), weigh each time and calculate the average value of the aspirations.
• Calculate average aspirated volume in µl multiplying the average aspiration amount [mg]
by the distilled water density coefficient
[µl/mg], which depends on temperature and
pressure according to the following table:
Temperature [°C]
20 1.0028 1.0029 1.0029
21 1.0030 1.0031 1.0031
22 1.0032 1.0033 1.0033
23 1.0034 1.0035 1.0036
24 1.0037 1.0038 1.0038
25 1.0039 1.0040 1.0040
Pressure [kPa]
95 101.3 105
If the average aspirated volume exceeds the
permissible value, the following should be done:
• Remove the pipetting pushbutton, (Fig. 4A)
Warning: The pipetting pushbutton consists
of 2 parts: the knob (Fig. 1A2) and the
pushbutton (Fig. 1A1). After removal of the
pushbutton, both parts are separated.
•Holding the volume setting knob to protect
it against rotation, insert the calibration key
into the cuts of the calibration screw, (Fig. 4B)
• Turn the key clockwise to reduce the aspirated volume, or counter-clockwise to increase
the volume, (Fig. 4C). One full turn of the calibration key changes the pipette aspiration volume
by the amount given in the table
• Take out the key and fix the pipetting pushbutton (Fig. 4D). The pipetting pushbutton should
be fixed by placing the knob on the arbor first
(Fig. 1A2) and then the pushbutton (Fig. 1A1).
Determine the average aspirated volume. The
average volume should be within the permissible range given in the table. If the volume
exceeds the values stated, the recalibration procedure should be repeated.
6 - CLEANING AND STERILIZATION
Cleaning
External surfaces of the pipetting pushbutton,
the ejector button, the handgrip, shaft and the
adjustment knob may be cleaned using a cloth
dampened in isopropyl alcohol.
Sterilization:
The pipette can be sterilized in the autoclave at
121 °C for 20 minutes. After sterilization, the pipette should be dried and cooled to room temperature.
It is recommended:
- to sterilize the pipette in autoclave with an initial
vacuum and drying cycle,
- prior to sterilization unscrew the nut connecting
the handle and module slightly. After autoclaving these parts should be screwed tight again.
The precision of the results should not alter if the
pipetting process and autoclaving are carried out
as described in this manual. Because a slight
change in the accuracy of the dosage may
occur, it is recommended to:
- check the calibration of the pipette after the initial first, third and fifth autoclaving cycles and
then after every 10 autoclaving cycles.
7 - PIPETTE KIT AND ACCESSORIES
Pipette kit
The pipettes are delivered in the kits including:
• Pipette
• Instruction manual
• Calibration key
• Identification labels
7 8
MULTICHANNEL
Accessories
Pipettor Tip Choices
BPE-10
BPE-50
BPE-200
BPT-50
BPT-200
BPE-300
BPT-300
Pipettor Stand Choices
BPE
BPT
P 4803-10, 10 µl tips, racked
P 4803-200, 200 µl tips, racked
P 4803-300, 300 µl tips, racked
P 5421 Stand for eight channel pipette
P 5422 Stand for twelve channel pipette
8 - SPARE PARTS
The spare parts for multichannel, (Fig. 1, 4):
A: Pipetting pushbutton
A1: Pushbutton A2: Knob
B: Adjustment knob
C: Ejector button
D: Piston’s assembly
E: Shaft
F: Ejector
G: Calibration key
Can be ordered from a Labnet representative
(type of the pipette and name of the part for this
pipette should be specified).
Warning: The replacement of the plunger
requires conducting of calibration procedure according to section 5.
Before returning a pipette to a Labnet representative please ensure that the pipette is completely
free of any contamination (chemical, microbial
or radioactive).
Contact Labnet at 732-417-0700,
fax: 732-417-1750,
email: labnet@labnetlink.com
BPM/08/2004
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