Thermo Scientific Variomag MAXI DIRECT User manual

POLY 15
Magnetic Stirrer
Operating Manual
50108213 Issue 02. 2007
TM
MAXI DIRECT
MULTIPOINT 6/15

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Contents
50108213 _02. 200 7 3 Thermo Scientific
Page
User considerations 6
Correct use 6
Incorrect use 6
Pictographs 6
1 Safety considerations 7
2 Equipment description 9
3 Function
10
4 Startup procedure
11
5 Stirring operation
12
5. 1 Stirring vessels
12
5.2 Magnetic stirring bars
13
5.3 Recommended rotation
speed ranges
15
5.4 Stirring
15
5.4.1 Tips on stirring
16
6 Maintenance and
cleaning
17
7 Troubleshooting
19
8 Technical specifications
20
9 Warranty
22

Assembly drawing
Thermo Scientific 4 50108213 _02. 200 7
1 START/STOP key 6 Stirring point
2 key 7 Digital display
3 key 8 Secondary power cable
4 MODE key 9 Power supply unit
5 Magnetic stirrer 10 Mains cable
Figure 1: The MAXI DIRECT magnetic stirrer with bench - top power supply unit.
1 START/ST OP key 7 Digital display
2 key 8 Secondary power cable
3 key 9 Power supply unit
5 Magnetic stirrer 10 Mains cable
6 Stirring points
Figure 2: The POLY 15 magnetic stirrer with bench - top power supply unit
1
2
3
5
6
7
8
9
10
8
9
10
1
2
3
5
6
7
4

Asse mbly Draw ing
50108213 _02. 200 7 5 Thermo Scientific
1 START/STOP key 6 Stirring points
2 key 7 Digital display
3 key 8 Secondary power cable
4 MODE key 9 Power supply unit
5 Magnetic stirrer 10 Mains cable
Figure 3: The MULTIPOINT 6 / 15 magnetic stirrer wit h bench - top power supply unit
1
2
3
4
5
6
7
8
9
10

User considerations
Thermo Scientific 6 50108213 _02. 200 7
U ser considerations
Correct use
The direct - controlled magnetic stirrers MAXI DIRECT , POLY 15 and MULTIPOINT 6
/ 15 are designed for laboratory use to stir liquids. The MAXI DIRECT magnetic
stirrer is fitted with a single stirring point, while the POLY 15 and the MULTIPOINT 6 /
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 ollowing areas:
On the laboratory bench,
In cold chambers,
In laminar flow equipment,
In safety laboratories and sterile rooms.
Incorrect use
The magnetic stirrers MAXI DIRECT , POLY 15 and MULTIPOINT 6 / 15 must not be
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 cessary. Moreover, the
integrated eletronics heat the magnetic stirrer additionally.
Pictographs
You will find the following pictographs in this operating manual:
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.
INFORMATION
This sign indicates easier working practices.
Indicates an operating step.
Indicates alternatives.

1 Safety considerations
50108213 _02. 200 7 7 Thermo Scientific
1 Safety considerations
For your own safety, you should observe the following safety warning signs.
The warning signs indicate potential sources of danger.
They also inform on how correct action can avert danger. You will find these warning
signs wherever there is a risk of dangerous situations.
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 solutions.
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.
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 perated in hazardous locations
and in a water bath.
CAUTION
Do not place hot stirring vessels on top of the magnetic stirrer
(5).
Maximum temperature: +56 °C.
CAUTION
Permitted ambient conditions:
Cf. Technical specifications.

1 Safety considerations
Thermo Scientific 8 50108213 _02. 200 7
Avoid extreme temperatu re changes.
The power supply unit (9) must not be run in humid rooms, or
set up in water splash zones.
CAUTION
Do not use chlorine- based cleaning agents, cleaning wool,
cleaning 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 cannot rotate freely. Do not
subject the magnetic stirring bar to a strong inverse magnetic
field. This may result in destruction of the magnetic stirring
bar.
INFORMATION
If you are not using the magnetic stirrer (5) for a longer period
of time, disc onnect it from mains supply. Only then the stirrer
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 must not exceed 50 mm. Do
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 rotation speeds.
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 otation
speed.

2 Equipment description
50108213 _02. 200 7 9 Thermo Scientific
2 Equipment description
Figure 1 to Figure 3 show the components together with their position numbers.
Number of stirring points (6):
MAXI DIRECT (Figure 1): 1 stirring point
POLY 15 (Figure 2): 15 stirring points
MULTIPOINT 6: 6 stirrin g points
MULTIPOINT 15 (Figure 3): 15 stirring points
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 r (5).
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 MAXI DIRECT and MULTIPOINT 6 / 15 is
hermetically encapsulated, as the magnetic drive is enbedded watertight in synthetic
resin inside the housing. This prevents germs from penetrating into the inside of the
magnetic stirrer (5). The magnetic stirrer (5) is cleared for use in safety laboratories
and sterile rooms.
The drive is constru cted without the use of moving parts and therefore completely
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 bars are
synchronized to rotate at the preselected speed. The soft start -up function
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 s
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 ou start and terminate the stirring operation with the START/STOP key (1). The
rotation speed is set with the key (2) and with the key (3). The digital display (7)
shows the currently set rotation speed.
MAXI DIRECT and MULTIPOINT 6 / 15:
Both the MAXI DIRECT magnetic stirrer as well as the MULTIPOINT magnetic
stirrers are additionally equipped with the MODE key (4). You can select either one
of four rotation speeds: 5/10/15/20 W.
You start and terminate the stirring ope ration with the START/STOP key (1). The
digital display (7) shows the mode selected last. You switch to the power display or
the rotation speed display via the MODE key (4). The desired power or rotation
speed can be selected with the key (2) and the key (3).
After selecting the stirring power, the digital display (7) switches automatically to the
rotation speed display after approximately 5 seconds.

3 Function
Thermo Scientific 10 50108213 _02. 200 7
3 Function
The magnetic stirrers MAXI DIRECT , POLY 15 and MULTIPOINT 6 / 15 are used for
chemical, microbiological, biotechnical or medical purposes, e.g.:
Growing microorganisms (e.g. aerating and growing bacteria cultures),
Dissolving nutrient media and solids,
To prevent the settling of suspended matter,
Titration.
The MAX I DIRECT magnetic stirrer is suitable for stirring larger volumes of liquid.
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 POLY 15 and MULTIPOINT 6 / 15 ca n stir liquids in several
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 will accelerate growth. However, the stirrers cannot
be used in incubators.
The MAXI DIRECT and MULTIPOINT 6 / 15 power settings can be adjusted in four
steps (5/10/15/20 watts). Use more power for larger quantities and more viscous
liquids and reduced pow er for long - term operation without heat generation.
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. The drive of the magnetic stirrer is contructed without the use of moving
parts, such as motors, bearings or belts, and is therefore completely wear - free.
You can set the speed in increments of 10 rpm.
Selectable speed range:
MAXI DIRECT and MULTIPOINT 6 / 15 : 80 to 2,000 rpm
POLY 15 : 130 to 990 rpm
The digital display (7) shows the c urrent speed of the magnetic stirring bars. All
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 POLY 15 and MULTIPOINT 15 , ho wever, the magnetic stirring bars
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.