Retsch ZM 200 User manual

Operating Instructions Ultra Centrifugal Mill
Type ZM 200
Retsch GmbH, 42781 HaanRetsch-Allee 1-5, Germany, 08.02.2012 0003

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Information on these operating instructions............................................... 3
Warnings................................................................................................ 3
Repairs .................................................................................................. 3
Safety.............................................................................................................. 4
Safety instructions.................................................................................. 4
Safety directive summarised, part 1 ....................................................... 5
Safety directive summarised, part 2 ....................................................... 6
Confirmation .................................................................................................. 7
Technical specifications ............................................................................... 8
Intended use .......................................................................................... 8
Maximum feed quantity .......................................................................... 8
Maximal feed grain size.......................................................................... 8
Maximal end fineness achievable........................................................... 8
Drive output............................................................................................ 8
Rotor speed ........................................................................................... 8
ZM200 emissions................................................................................... 9
Materials and analyses of the grinding tools........................................... 9
Protection systems................................................................................. 9
Protective equipment ............................................................................. 9
Operating mode ..................................................................................... 9
Device dimensions................................................................................. 9
Base area required................................................................................. 9
Transport and assembly ............................................................................... 10
Packaging .............................................................................................. 10
Transport................................................................................................ 10
Temperature fluctuations........................................................................ 10
Intermediate storage .............................................................................. 10
Assembly ............................................................................................... 10
Requirements for the assembly site ....................................................... 11
Electrical connection .............................................................................. 11
Serial interfaces ..................................................................................... 12
Operation ....................................................................................................... 13
Connect the power ................................................................................. 13
Opening / closing / emergency unlocking of the grinding chamber......... 13
Inserting the grinding tools ..................................................................... 15
Operation via the ZM200 display unit ..................................................... 16
Symbols in the display unit..................................................................... 16
Adjustment options via the display menu ............................................... 17
LANGUAGES......................................................................................... 17
Incorrect language selection .................................................................. 17
Pre-selecting the SPEED ....................................................................... 17
Preselection of the starting time ............................................................. 17
STARTING the ZM200........................................................................... 18
OPENING MECHANISM........................................................................ 18
AUTOMATIC STOP ............................................................................... 18
ALARM .................................................................................................. 18
SERVICE ............................................................................................... 18
CONTRAST/BRIGHTNESS ................................................................... 18
DATE / TIME.......................................................................................... 19
Stand-by monitor.................................................................................... 19
Feeding in comminution material ........................................................... 19
Unsuitable comminution material ........................................................... 19
Suitable comminution material ............................................................... 20
Comminution methods ........................................................................... 20
Ultra-fine grinding with Conidur ring sieves............................................. 20
Pre-comminution with round hole ring sieves ......................................... 20
Comminution by cold grinding ................................................................ 21
Comminution with distance ring sieves................................................... 21
Comminution of extremely small volumes .............................................. 21
Assembly of accessories .............................................................................. 22
Paper filter with retainer ......................................................................... 22
Installation procedure............................................................................. 22
Cyclone separator with collecting container............................................ 23
Assembly procedure .............................................................................. 23
Distributor DR100 with tripod.................................................................. 24
Assembly procedure .............................................................................. 24
General points ............................................................................................... 25
Cleaning................................................................................................. 25
Maintenance .......................................................................................... 25
Adjusting the lock if the cassette cover leaks ......................................... 26
Copyright................................................................................................ 26
Changes................................................................................................. 26
Error messages on the display..................................................................... 27
F03 to F12.............................................................................................. 27
F13 to F26.............................................................................................. 28
Appendix ...............................................................................following pages

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Information on these operating
instructions
The present operating instructions for the Ultra Centrifugal
Mill of type ZM200 provide all the necessary information on
the headings contained in the table of contents.
They act as a guide for the target group(s) of readers
defined for each topic for the safe use of the ZM200 in
accordance with its intended purpose. Familiarity with the
relevant chapters on the part of each target group(s) of
readers is essential for the safe and proper use of the
equipment.
The present technical documentation has been designed
both as a source of reference and as a learning tool. Each
chapter is a self-contained unit.
The operating instructions do not contain any repair
instructions. Should repairs ever become necessary, please
contact your supplier or talk directly to Retsch GmbH.
http://www.retsch.com
Warnings
The following signs are used to warn of hazards:
Personal injuries
Material damage
Repairs
These operating instructions do not contain any repair
instructions. In the interests of your own safety, repairs
should only be performed by Retsch GmbH, an
authorised representative or by Retsch service
technicians.
In this case, please notify the following:
Your local Retsch representative
Your supplier
Retsch GmbH direct
Your address for service:

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Safety
The ZM200 is a modern, high-performance product
manufactured by Retsch GmbH. It incorporates the latest
technology. The machine is entirely safe in its operation
when used for the intended purpose and in accordance
with the present technical documentation.
Safety instructions
You, as the owner/operator, must ensure that the
persons who are entrusted to work on the ZM200:
have read and understood all the regulations contained
in the chapter on safety,
have made themselves familiar, before starting work,
with all the operating instructions and regulations rele-
vant to that particular target group,
have unrestricted access to the technical documentation
for this machine at all times,
new personnel must have familiarised themselves with
the safe use of the ZM200 and its intended purpose
before starting work with the machine, either through
verbal instruction by a competent person and / or with
the help of the present technical documentation.
Incorrect operation can result in injuries to persons and
damage to property. You bear the responsibility for your
own safety and that of your staff.
Ensure that no unauthorised persons have access to the
ZM200.
As a precaution, have your staff certify in writing that
they have received instruction in the operation of the
ZM200. A draft for such a form can be found at the end
of the chapter on safety.
We reject herewith any and all claims relating to personal injury or
material damage which result from the failure to comply with the
following safety instructions.

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Safety directive summarised, part 1
Safety instructions
We reject herewith any and all claims relating to personal injury or material damage which result
from the failure to comply with the following safety instructions.
Intended use
Do not make any modifications to the machine and only use Retsch approved spares and
accessories.
The conformity to the European guidelines declared by Retsch otherwise loses its
validity. It furthermore leads to the loss of all warranty claims.
Packaging
Please retain the packaging for the duration of the warranty since, in case of complaint, returning in
unsuitable packaging can jeopardize your warranty claims.
Transport
During transportation, do not subject the ZM200 to impacts, jolts or vibrations. The electronic and
mechanical components could otherwise be damaged.
Temperature fluctuations
In case of wide temperature fluctuations (during shipment by air, for instance), protect the ZM200 from
condensation. The electronic components could otherwise be damaged.
Scope of supply
If the shipment is incomplete and / or has suffered transport damage, you must notify the forwarder and
Retsch GmbH immediately (within 24 hours). Under certain circumstances, claims lodged at a later date
may not be considered valid.
Ambient temperature :
When the ambient temperature exceeds or falls below that specified, the electronic and mechanical
components may be damaged, and performance data changed to an unknown extent.
Air humidity :
At a higher air humidity, the electronic and mechanical components may be damaged, and performance
data changed to an unknown extent.
Electrical connection / connecting the power
Failure to observe the values on the data plate can cause damage to electronic and mechanical
components.
Inserting the grinding tools
Set the openings for the torsion lock on the collecting vessel and the ring sieve over the torsion lock pin.
Otherwise the ZM200 cannot be started.
When cold grinding, do not forcibly remove the plug-on rotor, which jams easily for physical reasons, but
rather wait for the temperature to level out.
Forced removal causes damage to the motor shaft and the rotor.
Do not forget to re-install the cassette cover.
Without the cassette cover, the motor is blocked by the thrust pins in the housing cover.

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Safety directive summarised, part 2
Feeding in comminution material
Do not feed in comminution material until the machine has been started.
Mechanical components could be damaged when starting from standstill with the comminution material
already fed in.
When feeding in comminution material, the anti-rebound fitting must be installed.
Danger that the comminution material will be sprayed about.
Unsuitable comminution material
Some comminution materials form explosive atmospheric mixtures. Check the properties of your
comminution material.
Explosion hazard
Dusty comminution material can escape through the filling hopper during grinding. Use suction extractors if
the comminution material is toxic or otherwise hazardous to health.
Danger of breathing in dust hazardous to health.
Comminution methods
Do not pre-grind without the ring sieve.
The collecting base can suffer serious damage
The rotor can damage the cassette cover.
Comminution by cold grinding
When cold grinding with liquid nitrogen, always fit the anti-rebound fitting Xinto the filling hopper.
Danger of injuries to eyes and skin from extreme freezing.
Wear safety gloves and goggles, The temperature of the liquid nitrogen is -196°C
Danger of injuries to eyes and skin from extreme freezing.
When cold grinding, do not forcibly remove the plug-on rotor, which jams easily for physical reasons, but
rather wait for the temperature to level out.
Forced removal causes damage to the motor shaft and the rotor.
Paper filter with retainer
The volume able to be taken up by the paper filter depends on the density of the grinding material and the
hole width of the ring sieve.
The paper filter can be destroyed by overfilling and by the weight of the comminution material
Cleaning
Do not clean the ZM200 with flowing water.
Mortal danger from electric shock
Only use a cloth dampened with water. solvents are not permitted.
Maintenance
The easy running of roller 1 on the trannion piece is essential for secure closing of the housing cover.
These operating instructions do not contain any repair instructions. In the interests of your own safety,
repairs should only be performed by Retsch GmbH, an authorised representative or by Retsch service
technicians.

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Confirmation
I have read and understood the chapters
Information on these
operating instructions and on Safety.
__________________________________
Signature of operator/owner
__________________________________
Signature of service technician

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Technical specifications
Machine type designation: ZM200
Intended use
The Retsch Ultra Centrifugal Mill ZM200 is deployed for rapid fine
grinding of soft to medium hard and fibrous materials up to a
grain size of 10 mm.
See the section in the chapter on "Operation" below for
examples:
"Unsuitable comminution material"
"Suitable comminution material"
"Comminution methods"
"Comminution by cold grinding"
The end fineness achievable is determined by :
The type of rotor
The speed of the rotor
The ring sieve
The shearing properties of the comminution material
The effective grinding technology and the extensive range of
accessories mean that the ZM200 can quickly prepare samples
ready for analysis in a way which preserves the material.
It is not designed as a production machine, but rather as a
laboratory device intended for single-shift, 8-hour operation.
Do not make any modifications to the machine and only use Retsch
approved spares and accessories.
The conformity to the European guidelines declared by Retsch
otherwise loses its validity.
It furthermore leads to the loss of all warranty claims.
Maximum feed quantity
Max. up to 20 ml with the collection container for
minimum quantities
The max. recommended feed quantity with the standard
collection container is 300ml, which corresponds to
approx. 1/3 of the cassette’s filling capacity. If more is
filled into the cassette, the sample and the appliance
may overheat.
Do not fill too much into the collecting container. Do not exceed a max.
1/3 of the filling capacity.
Excessive filling can cause overheating and damage to the plastic
housing.
Max. 5000 ml with components obtainable as accessories
Maximal feed grain size
Up to 10 mm
Maximal end fineness achievable
< 40 µm, in dependence on the feed material and ring sieve
Drive output
750 W / power draw approx. 1300 W
Rotor speed
Can be regulated from 6,000 –18,000 r.p.m.

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ZM200 emissions
Noise levels :
Noise measured according to DIN 45635-31-01-KL3
The noise levels are basically influenced by the speed of
the machine, the feed material, the feed grain size, the
rotor used and the ring sieve deployed.
Workplace related emission value LpAeq = up to 77.5 dB(A)
Measuring conditions :
Machine speed = 18,000 r.p.m.
Feed material = burnt lime
Feed grain size = <5 mm
Ring sieve deployed = 0.5 mm Conidur perforation
Rotor deployed = 12-tooth rotor
Materials and analyses of the grinding tools
See :
http://www.retsch.de/english/docs/grinding_tools.pdf
Protection systems
IP20
Protective equipment
The ZM200 is equipped with a fixture to automatically close the
cover. This prevents the device being started in an unsafe
state.
The device cannot be started unless the cover is closed.
It is only possible to open the device when the device is at
standstill.
Operating mode
S1
An operating mode with constant loading, the duration of which
suffices to reach the state of thermal rigidity. (DIN VDE 0530 T1)
Device dimensions
Height: Up to approx. 665 mm / Width: 410 mm / Depth : 365
up to 590 mm
Weight: Net approx. 38 kg
Base area required
410 mm x 590 mm;
A safe distance of 200mm is required at the rear to allow the
fan to fulfil its function.

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Transport and assembly
Packaging
The packaging has been adapted to the mode of
transport. It corresponds to the generally applicable
packaging guidelines.
Please retain the packaging for the duration of the warranty
since, in case of complaint, returning in unsuitable packaging
can jeopardize your warranty claims.
Transport
During transportation, do not subject the ZM200 to impacts,
jolts or vibrations. The electronic and mechanical components
could otherwise be damaged.
Temperature fluctuations
In case of wide temperature fluctuations (during shipment by
air, for instance), protect the ZM200 from condensation. The
electronic components could otherwise be damaged.
Intermediate storage
Likewise for intermediate storage, ensure that the ZM200
is stored in a dry place.
Assembly
R
Place the ZM200 on a sturdy laboratory bench.
2 people are required to carry the device.
The net weight of the ZM200 is approx. 38 kg
When installing a cyclone with a 5000ml collecting
container, there must be sufficient free space to the left
of the ZM200, see figure, because the cyclone's
collecting container is located below the feet of the
ZM200. This is not necessary for a cyclone with a
3000ml collecting container.
There is the option of compensating for unevenness on
the bench by adjusting the left rear foot of the ZM200
by up to 3mm. Turn wheel R on the foot until the
ZM200 is standing securely on all feet.

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Requirements for the assembly site
Ambient temperature :
5°C to 40°C
When the ambient temperature exceeds or falls below that specified,
the electronic and mechanical components may be damaged, And
performance data changed to an unknown extent.
Air humidity :
Maximum relative humidity 80% at temperatures up to 31°C,
declining in linear manner down to 50% relative humidity at 40°C
At a higher air humidity, the electronic and mechanical components
may be damaged, and performance data changed to an unknown
extent.
Assembly height :
Max. 2000 m above sea level
Electrical connection
The voltage and frequency for the ZM200 are shown on
the data plate.
Ensure that these values agree with those of the mains
power supply.
Connect the ZM200 to the mains power supply with the
power cable supplied.
When connecting the power cable to the mains supply,
use an external, delayed-action fuse in accordance with
the regulations applicable to the assembly site. We
recommend that no further devices be connected to this
socket.
The main switch of the ZM200 is at the rear. This
protects the device from overloads without the need to
replace a fuse. The ZM200 must solely be allowed to cool
down before being switched on again.
Important notes :
1. Electrical connections must use PE conductors !
2. A frequency converter is fitted to the drive unit of your ZM200. In order to fulfil the EMV
directive, this is equipped with a mains filter and screened cables to the motor. If your mains
power installation for the ZM200 contains a residual-current protective device, then when the
frequency converter switched on (switched on each time the grinding chamber hood is closed),
its interference suppression circuit can cause spurious tripping of the residual-current protective
device, without this being due to a defect in your ZM200 or mains power supply.
The state-of-the-art recommends selective, all-current sensitive residual-current protective
devices in such cases. The trip current needs to be sufficiently dimensioned because short-lived,
capacitive transient currents generated at switch on (screened cables, mains filter) can easily
cause spurious tripping.
Under certain conditions, it may be necessary to operate the ZM200 without a residual-current
protective device. It must nevertheless then first be ensured that this does not contradict the
regulations of the local electricity supply utility, or those of other institutions or applicable
standards.
Failure to observe the values on the data plate can cause damage to
electronic and mechanical components.

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Serial interfaces
To connect distributor DR100
Interface to update the ZM200 software
Inactive interface for optional data communication
with an external device at a later date. Software
update required.

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Operation
Connect the power
Ensure that the voltage and frequency of your mains power
supply agrees with the data plate on the ZM200.
Plug the power cable into the socket at the rear of the
unit
Plug the cable into the mains power socket
Turn the main switch on
Failure to observe the values on the data plate can cause damage to
electronic and mechanical components.
The language menu is displayed the first time the ZM200
is switched on.
The language required can be selected here by turning
operating button E. The selection is confirmed by pressing it
and the display shows "Open cover".
Opening / closing / emergency unlocking of
the grinding chamber

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A E K
S Ö
S
Press button A -
The safety lock opens and the cover can be folded back. The
grinding chamber is now freely accessible.
Closing
The grinding chamber cannot be closed unless the ZM200 is
connected to the mains power supply and the main switch at
the rear of the device is switched on.
Pull down the housing cover and press it downwards
until the cover closure is activated
A sensor recognises that the housing cover is closed and the
motorised cover closure is switched on.
The housing cover is locked automatically
Emergency unlocking
A key is fixed underneath the unit. This can be used to open
the ZM200 manually in case of a power failure.
Lift the unit
Remove key S
Apply a slotted screwdriver to the indentation in the
housing and lever out plastic plug K
(I) Insert the (S) key into the (Ö) opening on the
right-hand side.
(II) To unlock the gear, the key must be pushed in
further with some degree of force. While pushing the
key in, turn it in a clockwise direction as far as it will
go.
The cover can now be opened.
Seal opening Öagain with plastic plug K
Never actuate the emergency unlocking feature whilst the machine is
running, only do so with the machine at standstill and the mains
power disconnected.
Considerable danger of injuries from a long drive run-on time
without braking.

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Inserting the grinding tools
A B C D P E
F
No tools are required to insert the grinding tools.
Open the cover of the grinding chamber housing
Insert the labyrinth Ldisc, pay attention to the torsion lock
V
Install rotor A
Insert the collecting vessel (cassette) B, pay attention to
the torsion lock
Insert the ring sieve C, pay attention to the torsion lock
Ensure that the opening for the torsion lock Dbelow, arrow
Pto the right, is sitting correctly
Install cassette cover E
Close housing cover F.
Set the openings for the torsion lock on the collecting vessel and the
ring sieve over the torsion lock pin.
Otherwise the ZM200 cannot be started.
When cold grinding, do not forcibly remove the plug-on rotor, which
jams easily for physical reasons, but rather wait for the temperature to
level out.
Forced removal causes damage to the motor shaft and the
rotor.
Do not forget to re-install the cassette cover.
Without the cassette cover, the motor is blocked by the thrust
pins in the housing cover.
When the rotor is not in use, take it off the shaft. Crevice corrosion
can occur when the rotor is installed.
L
L
V

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Operation via the ZM200 display unit
The mills offer new, very user-
friendly operating functions. All
relevant data can be entered or
called up from a graphic display
operated with a single button.
The menu is multi-lingual.
D E
A
B
C
Designation
Function
A
Display
Displays the menu, the parameter settings, operating information and error
messages.
B
START key
Starts the grinding process
C
STOP key
Stops the grinding process
D
Key
Opens the grinding chamber hood
E
Setting button
All menu items can be selected and parameters adjusted by turning and
pressing this button.
Turn 1
The different menu items can be selected by turning.
Selected menu items are shown inversely.
Turn 2
Adjust parameters in opened menu items (see Press 1)
Press 1
Selected menu items are opened
Press 2
A short press confirms the adjustment of the parameters
Press 3
Return to the 1st level menu by continuously pressing the button.
Symbols in the display unit
DR connected
Automatic stop
Opening mechanism off
Alarm off
Motor too hot
°C
C°

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E
All menu items can be selected and parameters adjusted by turning and pressing
the setting button E.
Turn 1
The different menu items can be selected by turning.
Selected menu items are shown inversely.
Turn 2
Adjust parameters in opened menu items (see Press 1)
Press 1
Selected menu items are opened
Press 2
A short press confirms the adjustment of the parameters
Press 3
Return to the 1st level menu by continuously pressing the button.
Adjustment options via the display menu
Please consult the menu structure on this page for the setting options on the display explained below. The
selection bar in the display is operated as follows:
Move vertically through the structure by turning the setting button
Move horizontally through the menu structure by pressing the setting button
Adjust numeric values / options by turning the setting button
Confirm settings by pressing the setting button
Return to the previous level of the menu structure with "BACK"
Return to the start screen by prolonged pressing of the setting button
LANGUAGES
MENU
DISPLAY
LANGUAGES
This allows you to select your language. After making the selection and pressing the setting button the
complete menu structure will be displayed in your language.
Incorrect language selection
If the wrong language has been selected, switch the device off at the main switch.
Hold down the keys simultaneously and switch the device back on.
Once the correct language has been selected, switch the device off and immediately back on again.
Confirm your selection by pressing the setting button.
The device is now permanently set to your language and you should see the main menu
Pre-selecting the SPEED
SPEED
18000 rpm
16000 rpm
14000 rpm
12000 rpm
10000 rpm
8000 rpm
6000 rpm
Manual
In manual mode, the speed can be set between 6000-18000 rpm in single steps of 50 rpm. The
ZM200 is started at the speed which you pre-select, the unit likewise starts at this speed after being
turned on at the main switch. A different speed can be set even whilst the device is running by
pressing the setting button.
Once the STOP key has been activated, START can be pressed again immediately!
Preselection of the starting time
SETTING THE STARTING TIME
START IN
hh:mm:ss
You can use this function to start the ZM200 with a time delay.
- Press the setting button once to enter the setting menu.
- In the SET STARTING TIME menu press the setting button repeatedly to set the start delay in hours,
minutes and seconds.
Press the setting button again to leave the start delay setting.
Once you have selected the speed and closed the housing cover, the device is ready to start.
Press the START button. The set time counts down until the machine starts.
You can stop the delayed start at any time by pressing the STOP button, whereby this will also cancel the
set delay time.

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STARTING the ZM200
The device is ready to start after the speed has been selected and the housing cover closed. The rotor starts
after the green START button has been pressed and the performance screen appears on the display.
The current speed of the rotor is displayed in the top left. The performance screen
shows the performance range the machine is operating in. During grinding, the
100% range on the right should be avoided because the device is overloaded in
this performance range and reproducibility of grinding is no longer possible!
OPENING MECHANISM
MENU
SETTINGS
OPENING MECHANISM
This allows you to pre-select whether the grinding chamber cover should be raised automatically after
grinding has ended or may only be opened after pressing the button. If the function is switched off, the
pictogram appears on the display for confirmation.
When a distributor is used, two pictograms appear on the display: one is for the
distributor and the other to show that the opening mechanism function is switched off. The latter is prevent
the grinding chamber cover impacting against the duct during automatic opening. Please move the
distributor to the side before actuating the OPEN key!
AUTOMATIC STOP
MENU
SETTINGS
AUTOMATIC STOP
If a distributor is deployed, the run-on time for the ZM200 can be set here. This is the time after which the
device is stopped automatically when grinding has ended and the distributor emptied.
If this function is set, the appropriate pictogram appears on the display.
The function does not work properly unless the machine loading is constant, and not too low, because the
indicator for automatic stop is the loading. Should the device switch off prematurely due to too low loading,
it is advisable to work without the function.
ALARM
MENU
SETTINGS
ALARM
The error messages generated by false operation can be acoustically supported by an alarm.
If the function is switched off, the appropriate pictogram appears
SERVICE
MENU
SETTINGS
SERVICE
The service menu is sub-divided into four sub-menus:
TOTAL OPERATION HOURS
This counts the number of grinding hours, thus the sum of the times between START and STOP. The
times cannot be manipulated.
SOFTWARE VERSION
The version of the operating software can be called up and updated as required. If necessary, get in
touch with your Retsch distributor.
Should you have reached this menu by mistake and cannot return to the previous menu, switch the
device off at the main switch and re-start it.
CONTRAST/BRIGHTNESS
MENU
DISPLAY
CONTRAST
BRIGHTNESS
The contrast and brightness can be adapted to the particular user or ambient conditions (sunlight, glare
etc.).
If the contrast or brightness has been incorrectly set (the display can no longer be read), switch the device
off at the main switch, simultaneously hold down the START, STOP and COVER OPEN keys and switch it on
again. You will now see the language menu and the values for CONTRAST and BRIGHTNESS have returned
to the default settings.

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DATE / TIME
MENU
DATE
TIME
The current data and time can be entered here.
The time then appears on the stand-by monitor.
The power to the device can be turned off for up to 30 days without losing the settings.
Stand-by monitor
The stand-by monitor switches on automatically after the device has been inactive for 15 minutes (timed
from a STOP command).
The stand-by monitor disappears after a key is pressed or the setting button activated without executing the
command issued.
Should you be in a sub-menu when the stand-by monitor is activated, you will be returned automatically to
this selection window.
The stand-by monitor cannot be adjusted, it therefore cannot be switched off.
Feeding in comminution material
E X
There is the option of feeding in the comminution material
manually up to a grain size of 10mm, or automatically with
a distributor of type DR 100 (available as an accessory, see
chapter "DR100 with tripod) via the filling hopper E.
The anti-rebound fitting X installed in the filling hopper
prevents the comminution material from being sprayed back
out as it is fed in. This is especially recommendable when
grinding brittle materials.
Do not feed in comminution material unless the machine is
operating.
Mechanical components could be damaged when starting from
standstill and comminution material has already been fed in.
When feeding in comminution material, the anti-rebound fitting
must be installed.
Danger that the comminution material will be sprayed
about.
Unsuitable comminution material
The Ultra Centrifugal Mill is not suitable for grinding:
Minerals with a Mohs' hardness >4
e.g. quartz sands, corundum etc.
Ferro-alloys
Abrasive agents
Comminution material which could form explosive
atmospheric mixtures
Some comminution materials form explosive atmospheric mixtures.
Check the properties of your comminution material.
Explosion hazard
Toxic or other comminution materials which pose a
hazard to health
Dusty comminution material can escape through the filling hopper
during grinding. Use suction extractors if the comminution material
is toxic or otherwise hazardous to health.
Danger of breathing in dust hazardous to health.
We can obviously not discuss every potential problem
here. We therefore ask you to get in touch with our
application laboratory, our specialist field consultant or
one of our representative offices if further questions
arise.

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Suitable comminution material
The listing below shows which grinding tool you should
deploy for which comminution material in order to
achieve an optimum result.
Comminution materials
Grinding tools
Fodder pellets
Drugs
Straw
Dog cake
Spices
Grasses
Paper cellulose
6-tooth rotor
Adapt the ring sieve to the desired end fineness
For preparation of bulky, fibrous comminution material
Cereals
Maize
Tablets
Fibrous foodstuffs
Dragees
Confectionery
12-tooth rotor
Adapt the ring sieve to the desired end fineness
For preparation of fibrous, brittle comminution material
Dolomite
Talcum
Gypsum
Activated carbon
Wood/brown coal
Dry, non-hygroscopic chemicals
Ion exchanger
Sugar beet/cane
24-tooth rotor
Adapt the ring sieve to the desired end fineness
For preparation of medium-hard, brittle comminution material
Minerals with a Mohs' hardness to 4
Ductile metal powder
Compost
Garbage mixtures
Fluorspar/feldspar
Wear-proof coated rotors
Adapt the ring sieve to the desired end fineness
They can be deployed if it is possible that wear on the standard rotor
could have a disturbing influence on the subsequent analysis.
Biological products
Pharmaceuticals
Foodstuffs of all types
Biological research
Titanium rotors (free of heavy metals)
Adapt the titanium ring sieves to the desired end hardness.
They can be deployed whenever heavy metal contamination is
inadmissible. Titanium rotors and ring sieves should not be used for
hard, abrasive mixtures, but only for soft to medium-hard products.
Comminution methods
Ultra-fine grinding with Conidur ring sieves
This process is deployed to exploit the high shearing
power of Retsch-Conidur sieves.
Select the perforation width of the ring sieves in
dependence on the desired end fineness and on the feed
material. For the majority of materials, the fineness
achieved is around 80% smaller than half the perforation
size of the sieves deployed.
Pre-comminution with round hole ring sieves
This process is deployed to pre-grind material such as
fodder pellets, tablets etc..
Never pre-grind without a ring sieve.
The collecting base can suffer serious damage.
The rotor can damage the cassette cover.