Thermo Scientific VARIOMAG MINI 07 User manual

Magnetic Stirrer
Operating Manual
50108226 Issue 02. 2007
TM
MINI 07 MINI 20
MICRO 07 MICRO 20
COMPACT 07 COMPACT 20
MAXI 07 MAXI 20 MAXI 40

© 2007 Thermo Fis her Scientific Inc. All rights reserved.
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cifically
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Subject to change without notice.
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Contents
50108226 _02. 2007 3 Thermo Scientific
Page
Assembly drawings 4
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
4.1 Connecting the device
11
4.2 Stirring vessels
14
4.3 Magnetic stirring bars
14
5 Short operating manual for
TELEMODUL 20 C / 40 C
16
6 Stirring operation
18
6.1 Recommended rotation speed
ranges
18
6.2 Stirring using the TELEMODUL
control unit
18
6.3 Stirring using the TELEMODUL 20 C /
40 C
19
6.3.1 Selecting the language
19
6.3.2 Selecting a program
19
6.3.3 Stirring
20
6.3.4 Power adaptation
21
6.3.5 Mixing vertically (Shake)
21
6.3.6 Interval operation
21
6.3.7 Selecting the startup time
22
6.3.8 Terminating the stirring process
22
6.4 Tips on stirring
22
7 Remote operation
23
8 Maintenance and cleaning
25
9 Troubleshooting
26
10 Technical specifications
27
11 Warranty
31

Assembly drawings
Thermo Scientific 4 50108226 _02. 2007
Ass embly drawings
Figure 1: MINI, MICRO, COMPACT and MAXI stirring systems with TELEMODUL
and TELEMODUL 20 C / 40 C control units
Figure 2: TELEMODUL control unit as plug - in control unit (left) or with mains cable
(right)
1
2
4
1 Stirring point
2 Stirring drive
a) COMPACT
b) MICRO
c) MINI
d) MAXI
3 TELEMODUL control unit
4 Control cable
5
TELEMODUL 20 C / 40 C
control unit
(c)
(d)
(b) (a)
2 Stirring drive
3 TELEMODUL control unit
4 Control cable
6 Rotation speed control
button
7 Magnetic stirrer outlet
6
3
7
3
5
2
4

Assembly drawings
50108226 _02. 2007 5 Thermo Scientific
Figure 3: Control unit TELEMODUL 20 C / 40 C with power supply unit
TELEMODUL 20 C TELEMODUL 40 C
15 Power supply unit intake
16 Magnetic stirrer outlet
17 RS 232C port
Figure 4: Control unit TELEMODUL 20 C (left) and TE LEMODUL 40 C (right),
back view
9
10
11
8
12
13
14
5 TELEMODUL 20 C / 40
C control unit
8 Adjusting wheel
9 Program keys
10 Display
11 START/STOP key
12 Power supply unit
connecting cable
13 Power supply unit
14 Mains cable
15
16
15
17
16
without
function
5

User considerations
Thermo Scientific 6 50108226 _02. 2007
User considerations
Correct use
The remote - controlled single magnetic stirring systems MINI, MICRO, COMPACT and
MAXI are designed for stirring or vertical mixing of liquids. The MICRO, COMPACT and
MAXI stirring drives ar e ideally suited for submerged operation. The single magnetic
stirring systems can be employed for chemical, microbiological, pharmaceutical or
medical purposes.
The stirrers are suited to operation in the following areas:
On the laboratory bench
In incuba tors and gas incubators wit h or without air humidification
In cold chambers
MICRO, COMPACT and MAXI: In water bath
In laminar flow equi pment
In safety laboratories and sterile rooms
In measuring equipment (e. g. photospectromet ers)
Incorrect use
The magnet ic stirring systems MINI, MICRO, COMPACT and MAXI must not be
operated in hazardous locations.
Do not stir or shake flammable liquids with a low boiling point.
The magnetic stirring system MINI must not be operated in a water bath.
Do not heat liquids in p ressure sealed vessels (e.g. storage flasks, Erlenmeyer flasks).
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 h uman 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
50108226 _02. 2007 7 Thermo Sc ientific
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 control unit (3, 5).
The control unit (3, 5) must only be connected to a grounded socket.
DANGER
Magnetism.
Magnetic or metallic parts (e.g. data carriers, pacemaker s, watches)
can be affected by magnetic fields.
Keep such parts away from the stirring drive (2) and the magnetic
stirring bars.
CAUTION
The equipment must not be operated in hazardous locations.
CAUTION
Permissible ambient conditions:
Cf. Technical specifications.
Avoid extreme temperature changes.
The control unit (3, 5) must not be run in humid rooms, or set up in
water splash zones!
CAUTION
Connect only the appro priate power supply unit to the
TELEMODUL 20 C (cf. Technical specifications, contr ol units).
Connect only the appropriate power supply unit to the
TELEMODUL 40 C (cf. Technical specifications, control units).
Connection to another power supply unit may cause damage to the
control unit.
CAUTION
Before connecting the stirring drives ( 2) to the TELEMODUL 20 C / 40 C
control unit (5), please note the connection options as listed in Table 1.
Do not connect a single MINI, MICRO or COMPACT stirring drive to the
TELEMODUL 40 C control unit. This may result in overload and damage
the stirring drives.
You may connect only stirring drives of the same type to the benchtop
distributors, and you may only connect them in pairs.

1 Safety considerations
Thermo Scientific 8 50108226 _02. 2007
CAUTION
Do not place hot stirring vessels on top of the magnetic stirrer (2).
Maximum temperature: +56°C (except MICRO: max. +100°C).
CAUTION
TELEMODUL 20 C / 40 C:
If you selected the shake mode (vertical mixing):
Select the minimum speed setting a nd then increase it slowly.
Depending on the magnetic stirring bar used, you may be able to
perform vertical stirring only at lower speeds.
CAUTION
In case of repair, the equipment must only be opened by an authorized
service agent.
CAUTION
Do not a llow 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
In the case of circular and triangular magnetic stirring bars, the length
must not exceed 50 mm. The leng th of the magnetic stirring bars
should not exceed 80 % of the vessel diameter.
Do not use cylindrical stirring bars with a center ring, o r 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. Av oid this rotation speed setting when
the problem occurs. Quickly travel through this problem range when
adjusting the rotation speed.

2 Equipment description
50108226 _02. 2007 9 Thermo Sc ientific
2 Equipment description
Figures 1 to 4 show the components together with their position numbers.
Every magnetic stirring s ystem MINI, MICRO, COMPACT and MAXI is equipped with
one stirring point (1). The drive is inside the housing of the stirring drive (2), which is
completely watertight. This prevents germs from penetrating into the inside of the
stirring drive (2). The stirring drive (2) is cleared for use in safety laboratories and sterile
rooms. The drive is constructed without the use of moving parts and therefore totally
wear - free.
The stirring drive (2) gets its power either from the TELEMODUL control unit
(3; Figure 2 ) or the TELEMODUL 20 C / 40 C control unit (5; Figure 3).
On the budget -priced equipment incorporating the TELEMODUL control unit (3), the
rotation speed can be preselected continuously. This is done using the rotation speed
control button (6). The TELEMO DUL control unit (3) can be of the plug - in type, or be
fitted with a mains cable.
The TELEMODUL 20 C / 40 C (5) is available in two models, 20 C and 40 C. These two
models differ with regard to maximum speed and to stirring power (for details see the
tech nical specifications). The TELEMODUL 40 C control unit is additionally equipped
with a RS 232C port. The RS 232C interface can be used to remote- control the control
unit from a PC.
The TELEMODUL 20 C / 40 C (5) interface is menu - driven. The display (10) sh ows the
selected speed (rpm) and gives an overview over the functions selected.
You may preset speed and stirring power as well as change the stirring mode. The
adjusting wheel (8) is used for selecting the appropriate menu and for adjusting the
desired v alue. The three program keys (9) can be individually defined.
After the startup time (soft start) the stirring bar turns or mixes at the selected speed.
The TELEMODUL 20 C / 40 C (5) can be equipped with a four - way or eight - way
benchtop distributor (access ory), allowing you to control 2, 4, 6 or 8 stirring drives
simultaneously.
Stirring vessels and magnetic stirring bars do not fall within the scope of delivery.

3 Function
Thermo Scientific 10 50108226 _02. 2007
3 Function
The magnetic stirring systems MINI, MICRO, COMPACT and MAXI are used for
chemical, mic robiological, 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,
Integration in measurement equipment f acilitating concurrent measurement
and stirring.
The MINI stirring system is designed for very small vessels such as cuvettes. It is
extremely small and flat, has a highly flexible flat - strip cable, and is suitable for
integration in measurement equipment.
The powerful and handy MICRO stirring system with its completely sealed stainless
steel body can be used for extended temperature ranges. This stirring system can be
attached to analyzers, experimental set - ups, or stands. For this purpose it is fitted wit h
an M4 thread at the bottom of the device.
The COMPACT and MAXI stirring systems are particularly suited for routine laboratory
tasks and larger stirring quantities. Thanks to their robust stainless steel bodies they
can also be used in water baths.
Liqui ds may be stirred in vessels of various shapes (e.g. cuvettes, conical (Erlenmeyer)
flasks, beakers and test tubes). As the rotation speed can be variably adjusted, liquids
can be both moved gently as well as vigorously mixed.
When the stirring vessel is p laced on the stirring point (1), an electromagnetic field will
move the magnetic stirring bar.
When using the TELEMODUL 20 C / 40 C ( 5 ), you have a choice of stirring or vertically
mixing the liquid. During stirring operation, the liquid will rotate in the vessel. During
vertical mixing (shake mode), the current inside the vessel will be directed upwards and
downwards. The liquid will not rotate. The rotation or shaking frequency can be adjusted
continuously. The speed display shows the current rotating or oscillating speed of the
magnetic stirring bars. All magnetic stirring bars will be moving at the same frequency.

4 Startup procedure
50108226 _02. 2007 11 Thermo Sc ientific
4 Startup procedure
4.1 Connecting the device
DANGER
Supply voltage and supply frequency must be within the range specified
for the control unit ( 3, 5). The control unit (3, 5) must only be connected
to a grounded socket.
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 (2) and the magnetic
stirring bars.
CAUTION
The equipment must not be operated in hazardous locations.
CAUTION
Permissible ambient conditions:
Cf. Technical specifications.
Avoid extreme temperature changes.
The control unit (3, 5) must not be run in humid rooms, or set up in water
splash zones!
TELEMODUL control unit (3):
Turn the rotation speed control button (6) to position OFF.
Connect the control cable (4) of the stirring drive (2) to the output socket (7) of
the control unit (3). Tighten the knurled screw.
Plug the mains plug into a properly installed mains outlet.
If an absolutely germ - free environment is called for, the control unit (3) should
be located outside the sterile zone.

4 Startup procedure
Thermo Scientific 12 50108226 _02. 2007
Control unit TELEMODUL 20 C / 40 C (5):
CAUTION
Connect only the appropriate power supply unit to the TELEMODUL 20 C
(cf. Technical specifications, control units).
Connect only the appropriate power supply unit to the TELEMODUL 40 C
(cf. Technical specifications, control units).
Connection to another power supply unit may cause damage to the
control unit.
Connect the mains cable (14) with the power supply unit (13).
Plug the power supply unit connecting cable (12) into the power supply unit
intake (15) of the TELEMODUL 20 C / 40 C (5).
You ca n connect a stirring drive (2) directly to the control unit TELEMODUL 20 C / 40 C
(5) (standard version).
When using the four - way or eight - way benchtop distributor (Figure 5), you can control 2,
4, 6 or 8 identical stirring drives (2) (i.e. the stirring d rives should be connected in pairs).
This is particularly important when combining the powerful TELEMODUL 40 C control
unit with the smaller MINI, MICRO or COMPACT stirring drives. All stirring drives (2) stir
at the same speed and are completely synchronized.
CAUTION
Before connecting the stirring drives (2) to the TELEMODUL 20 C / 40 C
control unit (5), please note the connection options as listed in Table 1.
Do not connect a single MINI, MICRO or COMPACT stirring drive to the
TELEMODUL 40 C control unit. Th is may result in overload and damage
the stirring drives.
You may connect only stirring drives of the same type to the benchtop
distributors, and you may only connect them in pairs.

4 Startup procedure
50108226 _02. 2007 13 Thermo Sc ientific
Telemodul 20 C Telemodul 4 0 C
Benchtop distributor Benchtop distributor
Number or
stirring drives
minimum /
maximum
1 outlet
four - way eight - way 1 outlet four - way eight - way
MINI
2/4 2/8 2/4 2/8
MICRO
2/4 2/4 2/8
COMPACT
2/4 2/4 2/8
MAXI
2/4
= standard = not permitted = too weak
Table 1: Possible connections of stirring drives (2) to control units
TELEMODUL 20 C or 40 C (5)
Connecting the single stirring system (standard version):
Connect the control cable (4) of the stirring drive (2) to the output socket (16)
of the control unit (5). Tighten the knurled screw.
Connect the mains plug (14) into the mains socket.
If an absolutely germ - free environment is called for, the control unit (5) should
be located outside the sterile zone.
Connecting the benchtop distributor:
4 Contro l cable
18 Magnetic stirrer outlet
Figure 5: Four - way (left) and eight - way (right) benchtop distributor
output sockets (18) of the benchtop distributor that are connected by a line
(see Figure 5).
Connect the mains plug (14) into the mains socket.
If Place the benchtop distributor behind the control unit (5).
Connect the control cable (4) of the benchtop distributor to the output socket
(16) of the control unit (5). Tighten the knurled screw.
Connect the control cable of the stirring drives (2), always in p airs, with the an
absolutely germ - free environment is called for, the control unit (5) should be
located outside the sterile zone.
18
4
18
4

4 Startup procedure
Thermo Scientific 14 50108226 _02. 2007
4.2 Stirring vessels
You should use stirring vessels which are circular in shape, and made of glass,
nonmagnetic metal or plastic . Wall thicknesses should be of an even thinness. For the
MINI you may also use cuvettes.
Flat - bottomed glass vessels (not concave) and smooth surfaces improve the running
quality of the magnetic stirring bars. When stirring larger volumes of liquid, you s hould
use stirring vessels having a relatively small diameter with a thin bottom.
4.3 Magnetic stirring bars
We recommend using PTFE coated magnetic stirring bars supplied by THERMO
SCIENTIFIC . The bars are made from AlNiCo5 magnets or high performance rare - ea rth
permanent magnets. The following sizes are suitable:
Thermo Scientific recommends the following magnetic stirring bars:
Type Size (mm) Material Order No.
KOMET 15
KOMET 30
KOMET 50
(Ø x L) 9 x 15
(Ø x L) 12 x 30
(Ø x L) 21 x 50
SmCo
50087924
50087930
50087909
Table 2: M agnetic stirring bars
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 turn ing center and
carry out periodic oscillations. Avoid this rotation speed setting when
the problem occurs. Quickly travel through this problem range when
adjusting the rotation speed.
INFORMATION
In the case of circular and triangular magnetic stirring bars, the length
must not exceed 50 mm. The length of the magnetic stirring bars must
not exceed 80 % of the vessel diameter. Do not use cylindrical stirring
bars with a center ring, or elliptical stirring bars with a round cross -
section.

4 Startup procedure
50108226 _02. 2007 15 Thermo Sc ientific
Thermo Scie ntific has developed a new magnetic stirring bar KOMET (Figure 6 ). It
contains a high - quality super - strong samarium - cobalt magnet. KOMET shows a strong
magnetic force. The stronger attraction to the magnetic alternating field provides the
stirring bar with very efficient stirring properties. Even if there are greater distances (e.g.
in high 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 magneti c coupling in samarium - cobalt magnets will also increase friction.
The standard design of the KOMET magnetic stirring bar is therefore unsuitable for
stirring liquids containing particulate matter (such as mud) or for stirring in vessels with
a rough inter ior surface. Some of the KOMET stirring bars are specially fitted with a
wear - resistant 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 contai n solids (Figure Fehler! Verweisquelle konnte nicht gefunden
wer den. 7 ).
Any risk of demagnetisation by external magnetic fields is completely eliminated. All
KOMET series stirring bars can be readily recognized by their two conica l ends.
Figure 6 : KOMET stirring bar.
Side view (left) and cross - section through central portion (right).
Figure 7 : KOMET stirring bar with glide ring

5 Short operating manual for
TELEMODUL 20 C / 40 C
Thermo Scientific 16 50108226 _02. 2007
5 Short operating manual for
TELEMODUL 20 C / 40 C
Selecting a langu age, resetting the default settings, accessing device type /
version:
Press the adjusting wheel (8) : Selection is confirmed
Press and release the P1 and P2 keys together:
Back
Language
................................
Reset
Back
Language
Reset
Back
English
Spanish
German
French
Turn the adjusting
wheel (8)
: M arker moves
downward
: Marker moves
upward
Back
Language
................................
Reset
Factory setup
Factory defaults are restored:
Language: English
Startup time: 1x
Power: 50 %
Mode: S tirring
Interval: OFF
Stirring time: 00:10:00
Pause time: 00:00:30
P1: speed 200 rpm
P2: speed 400 rpm
P3: speed 600 rpm
Press and release the P1 and P3 keys together:
Shows device type and version.
Table 3: Selecting a language, resetting the default se ttings, accessing device type /
version
The selection marker indicates the selected function.
The circle -plus sign indicates the currently active function.
The down arrow indicates that the list is continued below.
The up arrow indicates that the list is continued above.
The right arrow indicates that this selection will open another menu.
Time: hours : minutes : seconds
Back in
menu
Move marker to Back and press adjusting wheel, or press program key.

5 Short operating manual for
TELEMODUL 20 C / 40 C
50108226 _02. 2007 17 Thermo Sc ientific
Selecting a progam:
Interval
ON
OFF
Stirring time
00:00:30
Select time by turning the
adjusting wheel
Pause time
00:00:15
Select time by turning the
adjusting wheel
back Interval Stirring time Pause time back
Interval
Stirring time
Pause time
back Interval
Stirring time
Pause time
back Interval Stirring time
Pause time
back Stirrer
Shake
Startup time 1x / 2x / 4x Select by turning the adjusting wheel Power 20 C: 25 % / 50 % / 75 % / 100 % 40 C: 10 % / 20 % / ... / 100 % Select by turning the adjust.wheel
back
Stirrer
Shake back
Stirrer
Shake back
Stirrer
Shake
back back
Startup time
Power
Mode
back Startup time Power
Mode
back Startup time Power Mode
Press the adjusting wheel (8) : Selection is confirmed
back Stirrer back
Stirrer
Turn the adjusting wheel (8):
Select speed
Turn the adjusting wheel (8)
: Marker moves
downward
: Marker moves
upward
Table 4: Selecting a progam

6 Stirring operation
Thermo Scientific 18 50108226 _02. 2007
6 Stirring operation
CAUTION
Do not place hot stirring vessels on top of the magnetic stirrer (2).
Maximum temperature: +56°C (except MICRO: max. +100°C ).
For MINI and MICRO, please observe the correct orientation of th e stirring drive (2) (Figure 9)
Bottom: Flat - strip cable or M4 thread
Figure 9: Correct orientation of the stirring drives MINI (left) and MICRO (right)
6.1 Recommended rotation speed ran ges
We recommend the following rotation speed ranges for various applications:
Application Rotation speed range
Microbiological and biotechnical applications: (rpm)
Aeration of bacteria cultures
Growth of bacteria cultures
Dissolving nutrient media
200 - 350
300 - 450
350 - 500
Routine laboratory work:
Prevent aeration of suspended matter
Titration
Dissolving solids
150 - 250
250 - 400
350 - 700
Table 5: Recommended rotation speed ranges
CAUTION
TELEMODUL 20 C / 40 C:
If you selected the shake mode (vertical m ixing):
Select the minimum speed setting and then increase it slowly.
Depending on the magnetic stirring bar used, you may be able to
perform vertical stirring only at lower speeds.
6.2 Stirring using the TELEMODUL control unit
Fill stirring vessels no more than half full (upper rotation speed range) or three -
quarters full (lower rotation speed range).
Place a magnetic stirring bar into every stirring vessel.
Turn the rotation speed con trol button (6) to position OFF
(see also Figure 2).
Center the stirring vessel onto the marked stirring point (1).
Top

6 Stirring operation
50108226 _02. 2007 19 Thermo Sc ientific
Turn the rotation speed control (6) clockwise until a slow speed is attained.
The magnetic stirring bar moves to the center of rotation.
Select the desired speed using the rotation speed control (6).
6.3 Stirring usin g the TELEMODUL 20 C / 40 C
INFORMATION
Please observe the tables of the short operating manual (chapter 5) for
operating the TELEMODUL 20 C / 40 C.
6.3.1 Selecting the language
The TELEMODUL 20 C / 40 C control unit can display messages in either of four
different languages: German, E nglish, French and Spanish. The factory default display
language is English .
Turn the control unit (5) off using the START/STOP key (11) (Figure 3).
Press program keys P1 and P2 (9) concurrently.
Release both program keys (9) simultaneously.
The display ( 10) shows the language selection menu (Table 3).
Select Language by turning the adjusting wheel (8).
Confirm your selection by pressing the adjusting wheel (8).
The display now shows the languages that can be selected (Table 3).
Select a language by turni ng the adjusting wheel (8).
Confirm your selection by pressing the adjusting wheel (8).
The display returns to the language selection menu. The selection marker is at the
Back position.
Exit the menu by pressing the adjusting wheel (8).
The display (10) re turns to the stirring display (Figure 10).
6.3.2 Selecting a progam
The three program keys labelled P1, P2 and P3 (9) can be programmed with individual
settings. Programs can be selected only if the stirrer has been turned off. When the
stirrer is turned on, th e last program selected will be active. Speed, stirring power, and
stirring mode settings are stored as a part of the currently active program.
rpm50%
750
*
Figure 10: Stirring display

6 Stirring operation
Thermo Scientific 20 50108226 _02. 2007
:
The stirring bar symbol turns when the stirrer is active. How the symbo l turns
indicates the selected stirring mode.
Stirrer: Symbol continuously turns in the same direction
Interval: Symbol alternates between turning clockwise and turning
counterclockwise
Shake: Symbol rocks back and forth
:
The stair symbol indicates red uced stirring power. The power is adjustable:
For the TELEMODUL 20 C in 4 increments between 25 % and 100 %.
For the TELEMODUL 40 C in 10 increments between 10 % and 100 %.
*
: The asterisk symbol remains visible on the display until the set speed (rpm) h
as been
reached (soft start).
Three program keys (9) are available for storing repeated combinations of parameters.
Changes to the parameters are stored as a part of the currently active program. The
speed can always be adjusted by simply turning the adj usting wheel (8).
Press one of the program keys P1, P2 or P3 (9).
Programs can be selected only if the control unit has been turned off with the
START/STOP key (11). All other settings can be adjusted while the unit is turned on.
The adjusting wheel (8) se rves two purposes: selecting a menu and adjusting values.
Press the adjusting wheel (8).
The displa y shows the main menu (Table 4)
Select a function by turning the adjusting wheel (8).
The selection marker indicates the selected function.
Confirm your selection by pressing the adjusting wheel (8).
The display will show the appropriate selection menu (Table 4) . Repeat the
process until you have reached the desired settings menu.
Use the adjusting wheel (8) to make the desired adjustment (e. g. to the stirring
power).
Confirm your setting by pressing the adjusting wheel (8).
The display will return to the previous menu. The marker will point to back .
Select another menu.
or
Confirm all settings by again pressing the adjusting wheel (8). Repea t until the
stirring display (Figure 10) reappears.
alternatively:
Press the program key (9) for which you made the settings. The settings are
stored, and the stirring display (Figure 10) reappears.
6.3.3 Stirring
Fill stirring vessels no more than half full (up per rotation speed range) or three -
quarters full (lower rotation speed range).
Place a magnetic stirring bar into every stirring vessel.
Place the stirring vessel on the stirring point (1) of the magnetic stirrer.
Select a program key (9).
Start the stirre r using the START/STOP key (11).
Set the desired speed using the adjusting wheel (8).