TM
MAXI DIRECT
POLY 15
Magnetic Stirrer
Operating Manual
50108213 Issue 02.
2007
MULTIPOINT 6/15
All other trademarks are the property of Thermo Fisher Scientific Inc and its subsidiaries.
cifically
© 2007
DURAN® is a trademark of SCHOTT AG.
Specifications, terms and pricing are subject to change.
Not all products
Please consult your local sales representative for details.
Dissemination and copying of this document, utilization and information of its content are not allowed, unless sp
authorized. Violations commit you to c
Subject to change without notice.
No liability assumed for literal mistakes
Thermo Electron LED GmbH is legal successor of H+P Labortechnik AG
Thermo Fisher Scientific Inc. All rights reserved.
are available in all countries.
ompensation.
e
.
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Phone Sales: 0800 1536376
Phone Service 0800 1112110
Fax:
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Phone:
Fax:
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User considerations
1
Safety considerations
2
Equipment description
3
Function
4
Startup procedure
5
Stirring operation
Contents
Correct use
Incorrect use
Pictographs
5.1 Stirring vessels
Page
6
6
6
6
7
9
10
11
12
12
6
Maintenance and
cleaning
7
Troubleshooting
8
Technical specifications
9
Warranty
5.2 Magnetic stirring bars
5.3 Recommended rotation
speed ranges
5.4 Stirring
5.4.1 Tips on stirring
13
15
15
16
17
19
20
22
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Thermo
Scientific
123567891089101235674
1
START/STOP key
2
key
7
3
key
8
Assembly drawing
6
Stirring point
Digital display
Secondary power cable
4
MODE key
5
Magnetic stirrer
Figure 1: The
9
MAXI DIRECT
Power supply unit
10
Mains cable
magnetic stirrer with bench-top power supply unit.
1
START/ST
2
key
3
key
5
Magnetic stirrer
6
Stirring points
Figure 2: The
Thermo
Scientific
POLY 15
OP key
8
9
magnetic stirrer with bench-top power supply unit
4
7
10
Digital display
Secondary power cable
Power supply unit
Mains cable
50108213
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123456789
10
Asse
mbly Draw
ing
1
START/STOP key
2
3
4
MODE key
5
Magnetic stirrer
Figure 3: The
key
7
key
8
9
MULTIPOINT 6 / 15
6
Stirring points
Digital display
Secondary power cable
Power supply unit
10
Mains cable
magnetic stirrer wit
h bench-top power supply unit
50108213
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Thermo
Scientific
User considerations
U
ser considerations
Correct use
The direct-controlled magnetic stirrers
/ 15
are designed for laboratory use to stir liquids. The
stirrer is fitted with a single
15
can stir several vessels simultaneously.
The stirrers can be employed for chemical, microbiological, biotechnical,
pharmaceutical or medical purposes.
The stirrers are suited to operation in the f
MAXI DIRECT, POLY 15
stirring point, while the
ollowing areas:
On the laboratory bench,
In cold chambers,
In laminar flow equipment,
In safety laboratories and sterile rooms.
and
MULTIPOINT 6
MAXI DIRECT magnetic
POLY 15
and the MULTIPOINT 6 /
Incorrect use
The magnetic stirrers
operated in hazardous locations.
The
stirrers must not be operated in a water bath.
Do not stir or shake flammable liquids with a low boiling point.
The suitability of the direct-controlled magnetic stirrers for use in incubators is limited,
because the stirring power cannot be adjusted as ne
integrated eletronics heat the magnetic stirrer additionally.
Pictographs
You will find the following pictographs in this operating manual:
MAXI DIRECT, POLY 15
DANGER
This sign refers to dangerous voltages.
DANGER
This sign refers to hazardous situations.
Hazards to human life are indicated by "LIFE HAZARD".
CAUTION
This sign indicates danger to equipment and machinery.
and
MULTIPOINT 6 / 15
cessary. Moreover, the
must not be
Thermo
INFORMATION
This sign indicates
Indicates an operating step.
Indicates alternatives.
Scientific
6
easier working practices.
50108213
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7
1
Safety
considerations
1
For your own safety, you should observe the following safety warning signs.
The
They also inform on how correct action can avert danger. You will find these warning
signs wherever there is a risk of dangerous situations.
Safety considerations
warning signs indicate potential sources of danger.
DANGER
Supply voltage and supply frequency must be within the range
specified for the power supply unit (9).
The power supply unit (9) must only be connected to an
earthed socket.
DANGER
The magnetic stirrers must not be immersed in water or
cleaning
DANGER
solutions.
Defective secondary power cables (8), mains cables (10), or
mains plugs must be replaced only with original parts by the
manufacturer or one of its representatives.
Return the defective power supply unit (9) to our customer
service for
DANGER
Magnetism.
Magnetic or metallic parts (e.g. data carriers, pacemakers,
watches) can be affected by magnetic fields.
Keep such parts away from the magnetic stirrer (5) and the
magnetic stirring bars.
CAUTION
The equipment must not be o
and in a water bath.
CAUTION
Do not place hot stirring vessels on top of the magnetic stirrer
(5).
Maximum temperature: +56 °C.
repair.
perated in hazardous locations
50108213
CAUTION
Permitted ambient conditions:
Cf. Technical specifications.
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Thermo
Scientific
1
Safety
considerations
Avoid extreme temperatu
The power supply unit (9) must not be run in humid rooms, or
set up in water splash zones.
CAUTION
Do not use chlorinecleaning agents containing metal parts or ammonium when
cleaning the equipment.
Suc
h agents can damage the surface of the equipment.
CAUTION
In case of repair, the equipment must only be opened by an
authorized service agent.
CAUTION
Do not allow AlNiCo5 type magnetic stirring bars to remain in
an alternating magnetic field if they
subject the magnetic stirring bar to a strong inverse magnetic
field. This may result in destruction of the magnetic stirring
bar.
re changes.
based cleaning agents, cleaning wool,
cannot rotate freely. Do not
INFORMATION
If you are not using the magnetic stirrer (5) for a longer period
of time, disc
is completely switched off.
INFORMATION
The length of the magnetic stirring bars must not exceed 80 %
of the vessel diameter. In the case of circular and triangular
magnetic stirring bars, the length
not use cylindrical stirring bars with a center ring, or elliptical
stirring bars with a round cross-section.
INFORMATION
Some magnetic stirring bars (especially triangular bars) may
have a critical resonance frequency at lower
This may cause the magnetic stirring bar to wander away from
the turning center and carry out periodic oscillations. Avoid
this rotation speed setting when the problem occurs. Quickly
travel through this problem range when adjusting the r
speed.
onnect it from mains supply.
Only then the stirrer
must not exceed 50 mm. Do
rotation speeds.
otation
Thermo
Scientific
8
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2
Equipment description
2
Figure 1 to Figure 3 show the components together with their position numbers.
Number of stirring points (6):
Power for the magnetic stirrer (5) is supplied through the power supply unit (9). The
secondary power cable (8) of the power supply unit (9) is connected to the jack at the
back of the magnetic stirre
The drive and electronic control unit are sealed into the housing of the magnetic
stirrer (2). The housing is completely sealed.
The housing of the magnetic stirrers
hermetically encapsulated, as the magnetic drive is enbedded watertight in synthetic
resin inside the housing.
magnetic stirrer (5). The magnetic stirrer (5) is cleared for use in safety laboratories
and sterile rooms.
The drive is constru
wear-free. In contrast to mechanical drives, it will nor generate circulating air between
the housing and the environment.
After a startup time of approximately 15 seconds, all magnetic stirring
synchronized to rotate at the preselected speed. The soft start
guarantees a safe acceleration of the magnetic stirring bars and can be monitored via
the digital display (7). The soft start-up function is switched on when a dot appear
next to the rotation speed in the digital display (79. As soon as the selected rotation
speed has been reached, the dot in the digital display (79 vanishes.
Stirring vessels and magnetic stirring bars do not fall within the scope of delivery.
POLY 15:
Y
rotation speed is set with the
shows the currently set rotation speed.
MAXI DIRECT and
Both the
stirrers are additionally equipped with the MODE key (4).
of four rotation speeds: 5/10/15/20 W.
You start and terminate the stirring ope
digital display (7) shows the mode selected last.
the rotation speed display via the MODE key (4).
speed can be selected
After selecting the stirring power, the digital display (7) switches automatically to the
rotation speed display after approximately 5 seconds.
Equipment description
MAXI DIRECT
POLY
MULTIPOINT 6: 6
MULTIPOINT
ou start and terminate the stirring operation with the START/STOP key
MAXI DIRECT
15
cted without the use of moving parts and therefore completely
MULTIPOINT 6 / 15:
(Figure 1):1
(Figure 2):
15
r (5).
This prevents germs from penetrating into the inside of the
magnetic stirrer as well as the
with the
(Figure 3): 15 stirring points
key (2) and with the
key (2) and the
stirring point
15 stirring points
stirrin
MAXI DIRECT
ration with the START/STOP key
g points
You switch to the power display or
The desired power or rotation
and MULTIPOINT 6 / 15
bars are
-up function
key (3). The digital display (7)
MULTIPOINT
You can select either one
key (3).
magnetic
is
s
(1). The
(1). The
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Thermo
Scientific
3
Function
3
The magnetic stirrers
chemical, microbiological, biotechnical or medical purposes, e.g.:
The
Due to its far-reaching magnetic field, it is suitable for highly viscose media or
samples in which sediments tend to form.
The magnetic stirrers
vessels simultaneously.
The magnetic stirrers are well suited to the growing of bacteria cultures outside the
incubator. If a power setting of 20 W is selected, the plates will heat to 10-20 K above
the ambient temperature. Heat
be used in incubators.
The MAXI DIRECT
steps (5/10/15/20 watts). Use more power for larger quantities and more viscous
liquids and reduced pow
You can stir liquids in various shapes of vessel (e.g. Erlenmeyer flasks, beakers). As
the rotation speed can be variably adjusted, liquids can be moved both gently as well
as vigorously mixed.
The stirring vessel contains a magnetic stirring bar. When the stirring vessels are
placed on the stirring points (6), a electromagnetic field will move the magnetic
stirring bars.
parts, such
Function
Growing microorganisms (e.g. aerating and growing bacteria cultures),
Dissolving nutrient media and solids,
To prevent the settling of suspended matter,
Titration.
MAX
I DIRECT
The drive of the magnetic stirrer is contructed without the use of moving
as motors, bearings or belts, and is therefore completely wear-free.
MAXI DIRECT, POLY 15
magnetic stirrer is suitable for stirring larger volumes of liquid.
POLY 15
and
MULTIPOINT 6 / 15 power settings can be adjusted in four
er for long-term operation without heat generation.
and MULTIPOINT 6 / 15
will accelerate growth. However, the stirrers cannot
and
MULTIPOINT 6 / 15 are used for
ca
n stir liquids in several
You can set the speed in increments of 10 rpm.
Selectable speed range:
MAXI DIRECT
POLY 15
The digital display (7) shows the c
magnetic stirring bars will be moving at the same speed. On the MULTIPOINT 6
magnetic stirring bars on neighbouring stirring points (6) will rotate in the same
direction. On the
will rotate in opposite directions.
The Memory function saves the setting last at switching off the device, even if
disconnected from mains supply for longer periods of time.
Thermo
Scientific
:
POLY 15
and MULTIPOINT 6 / 15: 80 to 2,000 rpm
urrent speed of the magnetic stirring bars. All
and
MULTIPOINT 15
10
130 to 990 rpm
, ho
wever, the magnetic stirring bars
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4
Startup procedure
4
Startup procedure
DANGER
Supply voltage and
specified for the power supply unit (9). The power supply unit
(9) must only be connected to an earthed socket.
DANGER
Magnetism.
Magnetic or metallic parts (e.g. data carriers, pacemakers,
watches) can be affe
Keep such parts away from the magnetic stirrer (5) and the
magnetic stirring bars.
CAUTION
The equipment must not be operated in hazardous locations
and in a water bath.
CAUTION
Permitted ambient conditions:
Cf. Technical specifications.
Avoid extreme temperature changes.
The power supply unit (9) must not be run in humid rooms, or
set up in water splash zones.
supply frequency must be within the range
cted by magnetic fields.
Connect the secondary power cable (8) of the power supply unit (9) to the
jack at the back of the magnetic stirrer (5).
Connect the mains cable (10) of the power supply unit (9) to the jack at the
back of the power supply un
Connect the mains plug (10) to the mains socket.
If a germ-free environment is required, accommodate the power supply unit
(9) outside the sterile area.
The magnetic stirrer (5) is now ready for operation.
it (9).
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11
Thermo
Scientific
5
Stirring operation
5
5.1 Stirring vessels
You
nonmagnetic metal or plastic. Wall thicknesses should be of an even thinness. Flat
bottomed glass vessels (not concave) and smooth surfaces improve the running
quality of the magn
When stirring larger volumes of liquid, you should use stirring vessels having a
relatively small diameter and a thin bottom.
The following table gives examples of suitable stirring vessels, and the available
stirring points. In the case of larger vessels, not every stirring point (6) can be
occupied by a vessel.
Stirring operation
should use stirring vessels which are circular in shape, and made of glass,
etic stirring bars.
Type
MULTIPOIN
Stirring vessels
Nominal
capacity
MULTIPOINT
T 6
Available stirring points
15
POLY 15
-
Erlenmeyer flasks
and flat-bottomed
flasks
Beakers (tall in
shape)
Centrifuging tubes
Test tubes
Cultivating tubes
Distance between
stirring points (mm)
*) restricted range of ap
**) test tube rack required
plication
25 ml
50/100 ml
250/500 ml
1000 ml
25 ml
50 ml
100/250 ml
600/1000 ml
2000 ml*
6
6
6
6
6
6
6
6
6
130
15
15
8/6
6
15
15
15
8
6
15**
65
Thermo
Scientific
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5
Stirring operation
5.2 Magnetic stirring bars
Thermo
Type
KOMET 15
KOMET 30
KOMET 50
recommends the following magnetic stirring bars:
INFORMATION
The length of the magnetic stirring bars must not exceed 80 % of the
vessel diameter. In the case of circular and triangular magnetic
stirring bars, the length must not exceed 50 mm. Do not use
cylindrical stirring bars with a center ring, o
with a round cross-section.
(Ø x L) 9 x 15
(Ø x L) 12 x 30
(Ø x L) 21 x 50
Size (mm)
Material
SmCo
r elliptical stirring bars
Order No.
50087924
50087930
50087909
INFORMATION
Some magnetic stirring bars (especially triangular bars) may have a
critical resonance frequency at lower rotation speeds. This may cause
the magnetic stirring bar to wander away from th
carry out periodic oscillations. Avoid this rotation speed setting when
the problem occurs. Quickly travel through this problem range when
adjusting the rotation speed.
e turning center and
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13
Thermo
Scientific
5
Stirring operation
Thermo
high-quality super-strong samarium-cobalt magnet.
force. The stronger attraction to the magnetic alternating field provides the stirring bar
with very efficient stirring properties. Even if there are greate
measuring cylinders) the stirring force will be maintained. The stability of the stirring
bar will not be impaired if the vessel has a curved bottom. The strong magnetic
coupling in samarium-cobalt magnets will also increase friction. The standard design
of the
containing particulate matter (such as mud) or for stirring in vessels with a rough
interior surface. Some of the
resitant glide ring for use under excruciating circumstances, such as when stirring
vessels feature rough plastic or stainless-steel bottoms or if the media to be stirred
contain solids (Figure 5).
Any risk of demagnetization by external m
KOMET
has developed a new magnetic stirring bar KOMET
KOMET
KOMET magnetic stirring bar is therefore unsuitable for stirring liquids
KOMET
series stirring bars can be readily recognized by their two conical ends.
stirring bars are specially fit
agnetic fields is completely eliminated. All
(Figur
shows a strong magnetic
r distances (e.g. in high
e 4). It contains a
ted with a wear
-
Figure 5:
Figure 6:
KOMET
Side view (left) and cross-section through central portion (right)
KOMET
stirring bar
stirrin
g bar with glide ring
Thermo
Scientific
14
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5
Stirring operation
5.3 Recommended rotation speed ranges
We recommend the following rotation speed ranges for various applications:
Application
Microbiological and biotechnical applications:
Aeration of bacteria cultures
Growth of bact
Dissolving nutrient media, intensive aeration of
bacteria cultures
Routine laboratory work:
Prevent accretion of suspended matter
Titration
Dissolving solids
5.4 Stirring
CAUTION
Do not place hot stirring vessels on top of the magnetic stirrer (5).
Maximum temperature: +56 °C.
eria cultures
Speed range
(rpm)
200-350
300-450
350-500
150-250
250-400
350-700
Fill stirring vessels no more than half full (high rotation speed range), or
three-quarters full (low rotation speed range).
Place a magnetic sti
Centre the stirring vessel onto the stirring point (6).
Press the START/STOP key
The magnetic stirrer has a soft-start feature that first centres the magnetic stirring
bars within th
MAXI DIRECT and MULTIPOINT 6 / 15:
With these magnetic stirrers you have a choice of four different stirring power settings
(5/10/15/20 watts). After startup, the digital display (7) shows th
selected.
The digital display (7) shows the set power (e.g. P 20 => 20 watt).
After the stirring power has been selected, the digital display (
automatically to the rotation speed selection after approximately
MAXI DIRECT, POLY 15 and MULTIPOINT 6 / 15:
The digital display (7) shows the currently set rotation speed. You can set the speed
in increments of 10 rpm.
Selectable speed range:
MAXI DIRECT
POLY 15
e vessels and then slowly accelerates them to the desired speed.
Press the MODE key (4).
Set the desired power with the
Set the desired rotation speed with the
and MULTIPOINT 6 / 15
:
rring bar into every stirring vessel.
(1).
key (2) and with the
:
80 to 2,000 rpm
130 to 990 rpm
e Mode setting last
key (3).
7)
changes
5 seconds.
key (2) and with the
key (3).
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15
Thermo
Scientific
5
Stirring operation
End stirring operation:
Press the START/STOP key
The magnet
magnetic stirring bars are stopped. However, the device is still live.
5.4.1 Tips on stirring
If rotation of the magnetic stirring bar is uneven or jerky:
Reaction
too strong
ic stirrer switches to standby. The digital display (7) goes out and the
INFORMATION
If you are not using the magnetic stirrer (5) for a longer period of time,
disconnect it from mains supply.
turned off.
Increase the rotation speed, or
Reduce power, or
Use a smaller magnetic stirring bar.
between the alternating magnetic field and the magnetic stirring bar is
.
(1).
Only then the stirrer is completely
If the magnetic stirring bar cannot be centred, or constantly wanders off
centre:
Reaction
too weak
If the stirring action is too weak:
between the alternating magnetic field and the magnetic stirring bar
, or the base of the stirring vessel is concave or too thick.
Move the stirring vessel a little back and forth and recentre it on the stirring
point (6).
Reduce the rotat
Increase power, or
Use a longer magnetic stirring bar or one with a larger diameter (e.g. the
elliptical or
Use a smaller stirring vessel with a thin-walled, flat base, or
Reduce the filling level in the stirr
Increase power, or
Use a magnetic stirring bar of the
Use a longer magnetic stirring bar, or a stirring vessel of smaller diameter.
KOMET
ion speed, or
magnetic stirring bar), or
ing vessel.
KOMET
series, or
Thermo
Scientific
16
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6
Maintenance and clean
ing
6
The magnetic stirrer (5) is maintenance-free.
The magnetic drive of
watertight in synthetic resin inside the housing.
carried over to the inside or
resistant to acids and alkalis.
The standing surface is coated with a protective film. You may leave this on the
magnetic stirrer (5), or strip it off.
Clean the surfaces of the magnetic stirrer (5) with
intervals.
For this purpose you can use:
Maintenance and cleaning
DANGER
The magnetic stirrers must not be immersed in water or cleaning
solutions.
CAUTION
Do not use chlorineagents containing metal parts or ammonium when cleaning the
equipment.
Such agents can damage
water containing a surfactant detergent additive,
isopropanol.
based cleaning agents, cleaning wool, cleaning
MAXI DIRECT
the outside. The stainless steel surface is largely
the surface of the equipment.
and MULTIPOINT 6
This prevents germs from being
a moistened cloth at regular
/ 15 is enbedded
Switch the magnetic stirrer (5) to standby with the help of the START/STOP
key
Disconnect the secondary power cable (8) from the magnetic stirrer (5).
Clean the surfaces of the magnetic stirrer (5).
(1). The d
DANGER
Defective secondary power cables (8), mains cables (10), or mains
plugs must be replaced only with original parts by the manufacturer or
one of its representatives.
Return the defective power supply unit (9) to our customer service for
repair.
In case of repair, the equipment must only be opened by an authorized
service agent.
CAUTION
igital display (7) disappears.
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17
Thermo
Scientific
6
Maintenance and cleaning
In case of necessity to repair the equipment, it should be returned to an authorized
servicing agent. The equipment must be clean and free from harm
To avoid transport damages during the shipment, please send the equipment
correctly packed in the original packing.
ful substances.
Please always enclose the filled out return delivery note.
If necessary ask for the return delivery note at Thermo (addre
cover sheet).
When ordering spares, please state equipment type and serial number.
You can obtain further technical documents (e.g. circuit diagrams, board data) for
your engineers by contacting the address on the inside of the cover
ss: see inside of the
sheet.
Thermo
Scientific
18
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7
Troubleshooting
7
Troubleshooting
Rotation of the magnetic stirring bar is always irregular:
It is unavoidable that magnetic stirring bars will age with time, for example
through sterilization, use at excessive temperatures, or mechanical stre
as when you drop it). This may adversely affect the magnetic properties of the
stirring bar.
Do not allow AlNiCo5 type magnetic stirring bars to remain in an
alternating magnetic field if they cannot rotate freely. Do not subject
the ma
result in destruction of the magnetic stirring bar.
Remove and replace the magnetic stirring bar with a new one.
Or:
Use the
T
hermo
Samarium-Cobalt magnets. Any risk of demagnetization by external magnetic
fields is completely eliminated.
CAUTION
gnetic stirring bar to a strong inverse magnetic field. This may
KOMET
(see chapter 5.2
series of super-strong magnetic stirring bars offered by
).
They are made from high performance
ss (such
The magnetic stirrer (5) fails to operate:
Check to see whether the power supply unit (9) is delivering voltage.
The power supply unit (9) is fitted with a temperature controlled safety system which
will switch off the power supply unit (9) permanently in an overload situation.
50108213
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19
Thermo
Scientific
8
Technical specifications
8
Technical specifica
Type
Order No.
Stirring points
Distance
between stirring
points
Stirring volume
Stirring po
Rotation speed
range
Speed
regulation for
alternating
loads
wer
MAXI
DIRECT
50094711
1
mm
-
ml
W
rpm
1 5.000
5/10/15/20
80 2.000
tions
POLY 15
50094596
15
6
65
1
800
10
130 990
MULTIPOIN
T 6
50093557
130
1 3.000
5/10/15/20
80 2.000 80 2.000
none
MULTIPOINT
15
50093538
15
65
1 3.000
5/10/15/20
Dimensions
(W
x D x
Weight
Housing
Permissible
operating
conditions
Permissible
storage
conditions
Operating
voltage
Protective
system (EN
60529)
H)
kg 2.5 6 7.5 7.5
mm
VD
C
180 x 215 x
35
Stainless
steel
+5
°C to +40 °C at max. 95 % relative humidity
-
40 °C to +70 °C at 10 % to 95 % rel
24
IP 62 IP 32 IP 62 IP 62
240 x 420 x
35
Stainless
steel,
powder
coated
500 to 1,060 hPa barometric pressure
24
-
240 x 420 x
35
Stainless
steel
ative humidity
24
240 x 420 x
Stainless steel
35
24
Equipment
construction
Thermo
Scientific
according to IEC 1010
20
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8
Technical specifications
Bench-top power
supply unit
Order No.
Supply v
frequency
Operating voltage
Length of cable
Mark of conformity
oltage /
Protection (EN 60529)
Permissible operation
conditions
Permissible storage
conditions
VAC / Hz
VDC
20 W
50093506
100
240 / 50 60
24
Primary and secondary cable approx. 2
CE, CETL
m
UL
IP 20
+5 °C to +40 °C at 30 % to 80 % r
humidity
700 to 1,060 hPa barometric pressure
-
40 °C to +70 °C at 10 % to 95 % relative
humidity
500 to 1,060 hPa barometric pressure
Subject to technical alterations
elative
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21
Thermo
Scientific
9
Warranty
9
VARIOMAG magnetic stirrers have a mod
possible degree of trouble-free operation, thanks to their maintenance-free stirring
and magnetic drives.
If despite our strict quality controls a system component should ever fail to work
perfectly, it can be repai
Please retain your invoice, which will be needed when presenting any warranty
claims.
Two years full warranty on all system components!
Warranty
ular construction and offer the greatest
red or replaced by our after-sales service without difficulty.
Thermo
Scientific
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