Retsch Mixer Mill MM 500 control User manual

© Retsch GmbH, 42781 Haan, Retsch-Allee 1-5, Germany | 31.08.2021 Version 0001
Manual
Mixer Mill MM 500 control
Translation

2
Copyright
© Copyright by
Retsch GmbH
Retsch-Allee 1-5
42781 Haan
Germany

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Table of Contents
1Notes on the manual............................................................................................................................. 7
1.1 Disclaimer.......................................................................................................................................... 7
1.2 Copyright............................................................................................................................................ 7
1.3 Explanation of signs and symbols ..................................................................................................... 7
1.4 Explanations of the Safety Instructions ............................................................................................. 8
2Safety...................................................................................................................................................... 9
2.1 Intended use of the device................................................................................................................. 9
2.2 Improper use...................................................................................................................................... 9
2.3 Obligations of the operating company............................................................................................. 10
2.3.1 Provisions .................................................................................................................................... 10
2.3.2 Personnel..................................................................................................................................... 10
2.3.3 Workstation and device ............................................................................................................... 10
2.3.4Qualification of personnel ............................................................................................................ 10
2.3.5 Personal protective equipment (PPE) ......................................................................................... 11
2.4 Protective Equipment....................................................................................................................... 11
2.5 Repairs............................................................................................................................................. 11
2.6 Preventing risks during normal operation........................................................................................ 12
2.7 Preventing damage to equipment.................................................................................................... 13
2.8 Confirmation Form for the Managing Operator................................................................................ 13
3The Mixer Mill MM 500 control ........................................................................................................... 15
3.1 Technical data ................................................................................................................................. 17
3.2 Emissions......................................................................................................................................... 19
3.3 Views of the device.......................................................................................................................... 21
3.3.1 Front............................................................................................................................................. 21
3.3.2 View of the grinding jar support................................................................................................... 22
3.3.3 View of the thermal plate with sensor.......................................................................................... 23
3.3.4 Back............................................................................................................................................. 24
3.3.5 Changing the connections for the cooling system....................................................................... 24
3.4 Connection of MM 500 control to external cooling systems............................................................ 25
3.4.1 Operating the MM 500 control with the cryoPad ......................................................................... 26
3.4.2 System overview MM 500 control and cryoPad .......................................................................... 27
3.4.3 Operating the MM 500 control. on a chiller (e.g. the Lauda Microcool MC 1200)....................... 28
3.4.4 System overview MM 500 control and Lauda Microcool MC 1200 ............................................. 30
3.4.5 Operating the MM 500 control with a cryostat............................................................................. 31
3.4.6 System overview MM 500 control and cryostat........................................................................... 33
3.5 Signs on the device ......................................................................................................................... 34
3.6 Type Plate Description..................................................................................................................... 36
4Packaging, Transport and Installation .............................................................................................. 37
4.1 Accessories included with delivery.................................................................................................. 37
4.2 Packaging........................................................................................................................................ 37
4.3 Transport.......................................................................................................................................... 37
4.4 Temperature Fluctuations and Condensation ................................................................................. 38
4.5 Conditions for the Installation Site................................................................................................... 38
4.6 Remove packaging.......................................................................................................................... 41
4.7 Removing the Transportation Lock.................................................................................................. 42
4.8 Removing the Transportation Aid.................................................................................................... 46
4.9 Inserting the transport aid................................................................................................................ 48
5First Commissioning........................................................................................................................... 49
5.1 Electrical Connection....................................................................................................................... 49
5.2 Connecting the device to the power supply..................................................................................... 50
6Operating the Device .......................................................................................................................... 52
6.1 Switching the device on/off.............................................................................................................. 53
6.2Opening and Closing of the Device................................................................................................. 54

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6.3 Specifications regarding grinding balls and grinding jars ................................................................ 55
6.4 View of grinding jars ........................................................................................................................ 56
6.5 Opening aid...................................................................................................................................... 57
6.5.1 Grinding Jar Identification............................................................................................................ 58
6.5.2 Ball Sizes and Speeds................................................................................................................. 58
6.5.3 Recommended maximum ball sizes............................................................................................ 58
6.5.4 Recommended Grinding Jar Filling ............................................................................................. 58
6.6 Safety instructions on the handling of liquid nitrogen...................................................................... 59
6.7 Oxygen deficiency ........................................................................................................................... 59
6.7.1 Dangers ....................................................................................................................................... 59
6.7.2 Causes......................................................................................................................................... 59
6.7.3 Recommendations....................................................................................................................... 60
6.7.4 General conduct in the case of an accident ................................................................................ 60
6.8 Cryogenic burns............................................................................................................................... 60
6.8.1 Dangers ....................................................................................................................................... 60
6.8.2 Causes......................................................................................................................................... 61
6.8.2.1 Burns through splashes....................................................................................................... 61
6.8.2.2 Burns through contact.......................................................................................................... 61
6.8.3 Recommendations....................................................................................................................... 61
6.8.4 General rules of conduct for splashes with liquid nitrogen.......................................................... 61
6.8.4.1 To the eyes.......................................................................................................................... 61
6.8.4.2 On the skin........................................................................................................................... 61
6.9 Special grinding methods ................................................................................................................ 61
6.9.1 Cryogenic grinding with the cryoPad........................................................................................... 61
6.9.2 Cryogenic grinding with the optional cryokit ................................................................................ 62
6.10 Wet grinding..................................................................................................................................... 63
6.10.1 Wet Grinding with Highly Flammable Materials....................................................................... 63
6.11 Preparing the grinding jar ................................................................................................................ 63
6.12 Changing the grinding jar seal for cryogenic grinding ..................................................................... 64
6.12.1 Opening the grinding jar .......................................................................................................... 65
6.12.2 Filling the grinding jar............................................................................................................... 67
6.12.3 Closing the grinding jar............................................................................................................ 68
6.13 Inserting the Grinding Jar ................................................................................................................ 69
6.13.1 Opening the grinding jar support ............................................................................................. 70
6.13.2 Inserting the grinding jar .......................................................................................................... 71
6.13.3 Closing the grinding jar support............................................................................................... 74
6.14 Grinding process.............................................................................................................................. 75
6.14.1 Starting the grinding process................................................................................................... 76
6.15 Removing the sample material........................................................................................................ 77
7Device control...................................................................................................................................... 81
7.1 Device control with cryoPad ............................................................................................................ 81
7.2Device control without cryoPad ....................................................................................................... 81
7.3 Menu interface on the touchscreen ................................................................................................. 82
7.4 Function elements ........................................................................................................................... 83
7.5 Menu navigation .............................................................................................................................. 87
7.6 Main menu....................................................................................................................................... 88
7.7 Controlling the grinding process...................................................................................................... 89
7.8 Starting the grinding process........................................................................................................... 90
7.9 Pausing the grinding process .......................................................................................................... 90
7.10 Stopping the grinding process......................................................................................................... 90
7.11 Program mode................................................................................................................................. 90
7.11.1 Select a Program..................................................................................................................... 92
7.11.2 Edit a Program......................................................................................................................... 95
7.11.3 Save a Programme.................................................................................................................. 96

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7.11.4 Delete a Programme................................................................................................................ 96
7.12 Cycle mode...................................................................................................................................... 96
7.12.1 Selecting the cycle................................................................................................................... 98
7.12.2 Editing the cycle....................................................................................................................... 99
7.12.3 Saving the cycle..................................................................................................................... 101
7.12.4 Deleting the cycle .................................................................................................................. 101
7.13 System settings ............................................................................................................................. 101
7.13.1 myRetsch............................................................................................................................... 104
7.13.2 Remote .................................................................................................................................. 105
7.13.3 Signalling device.................................................................................................................... 106
7.13.4 Temperature drift ................................................................................................................... 106
7.13.5 Brightness.............................................................................................................................. 107
7.13.6 Date and time......................................................................................................................... 108
7.13.7 Software Version ................................................................................................................... 108
7.13.8 Operating Hours..................................................................................................................... 108
7.13.9 Serial number......................................................................................................................... 108
7.13.10 Software Update.................................................................................................................... 108
7.13.11 Service Environment.............................................................................................................. 108
8Error Messages and Information Notes.......................................................................................... 110
8.1 Error Messages ............................................................................................................................. 110
8.2 Information Notes .......................................................................................................................... 115
9Servicing ............................................................................................................................................ 118
9.1 Cleaning......................................................................................................................................... 118
9.1.1 Cleaning the outside of the device ............................................................................................ 119
9.1.2 Cleaning the collecting tray........................................................................................................ 119
9.1.3 Cleaning the inside .................................................................................................................... 119
9.1.4 Cleaning the grinding jar............................................................................................................ 119
9.1.5 Cleaning the grinding balls ........................................................................................................ 119
9.2 Maintenance .................................................................................................................................. 119
10 Wear.................................................................................................................................................... 120
10.1 Returning for repair and maintenance........................................................................................... 120
11 Accessories ....................................................................................................................................... 121
12 Disposal.............................................................................................................................................. 122
13 Index ................................................................................................................................................... 124

Notes on the manual
6

Notes on the manual
7
1 Notes on the manual
This manual provides technical guidelines for the safe operation of the device. Read this
manual through carefully before installing, putting into service and operating the device.
Reading and understanding this manual is essential for handling the device safely and as
intended.
This manual does not contain any repair instructions. Please contact your supplier or contact
Retsch GmbH directly if anything is unclear or you have questions about these guidelines or the
device, or in the case of any faults or necessary repairs.
You can find further information about your device at https://www.retsch.com on the pages for
the specific device concerned.
Amendment status:
The document amendment 0001 of the "Mixer Mill MM 500 control" manual has been prepared
in accordance with the Machinery Directive 2006/42/EC.
1.1 Disclaimer
This manual has been prepared with great care. We reserve the right to make technical
changes. We assume no liability for personal injuries resulting from the failure to follow the
safety information and warnings in this manual. No liability will be assumed for damage to
property resulting from the failure to follow the information in this manual.
1.2 Copyright
This document or parts of it or its content may not be reproduced, distributed, edited or copied
in any form without prior written permission of Retsch GmbH. Damage claims shall be asserted
in the case of infringements.
1.3 Explanation of signs and symbols
The following signs and symbols are used in this manual:
Signs and symbols
Meaning

Indicates a recommendation and/or important information.
Bold type
Indicates an important term.
•< Point 1>
•< Point 2>
•< Point 3>
List of equivalent points.

Steps for following an instruction.

Notes on the manual
8
1.4 Explanations of the Safety Instructions
DANGER
D1.0000
Risk of fatal injuries
Source of danger
−Possible consequences if the danger is ignored.
•Instructions and information on how to avoid the risk.
Fatal or serious injuries may result if the “Danger” sign is disregarded. There is a very high
risk of a life-threatening accident or lasting personal injury. The signal word DANGER is
additionally used in the running text or in instructions.
WARNING
W1.0000
Risk of life-threatening or serious injuries
Source of danger
−Possible consequences if the danger is ignored.
•Instructions and information on how to avoid the risk.
Life-threatening or serious injuries may result if the “Warning” sign is disregarded. There is
an increased risk of a serious accident or of a possibly fatal personal injury. The signal word
WARNING is additionally used in the running text or in instructions.
CAUTION
C1.0000
Risk of injuries
Source of danger
−Possible consequences if the danger is ignored.
•Instructions and information on how to avoid the risk.
Average to slight injuries may result if the “Caution” sign is disregarded. There is an average
or slight risk of an accident or personal injury. The signal word CAUTION is additionally
used in the running text or in instructions.
NOTICE
N1.0000
Type of damage to property
Source of the damage to property
−Possible consequences if the information is ignored.
•Instructions and information on how to avoid the damage to
property.
Damage to property may result if the information is disregarded. The signal word NOTICE is
additionally used in the running text or in instructions.

Safety
9
2 Safety
CAUTION
C2.0002
Risk of injury
Lack of knowledge of the manual
−The manual contains all safety-related information. Disregarding the
manual can therefore lead to injuries.
•Read the manual carefully before operating the device.
Target group:
The MM 500 control has been designed for preparing samples in a laboratory environment.
laboratory environment. This manual is therefore directed at persons who work with this device
in a comparable environment and who already have experience with similar equipment.
The MM 500 control is a modern, efficient, state-of-the-art product from Retsch GmbH. Its
reliability is ensured when used as intended and with knowledge of this technical
documentation.
2.1 Intended use of the device
The MM 500 control is designed for the crushing, grinding, mixing and homogenisation of wet
and dry soft, medium-hard, fibrous and brittle materials with a particle size of up to 10 mm.
As a laboratory machine, the MM 500 control may only be used to prepare samples and not as
a production machine.
The device has been designed for stationary use in a dry and clean working environment.
The user and operating personnel must have read the manual and be familiarised with the
complete functional scope of the device.
2.2 Improper use
The MM 500 control may only be used as intended.
Any uses other than the described intended use are regarded as improper use.
The MM 500 control is not suitable for processing sample materials that can form explosive air
mixtures.
Any form of claims for damage to equipment or personal injury resulting from improper use
and/or the failure to comply with the safety instructions shall be ruled out.

Safety
10
2.3 Obligations of the operating company
2.3.1 Provisions
The user bears responsibility for ensuring that people working with the device and the
corresponding equipment have taken note of and understood all relevant safety regulations.
2.3.2 Personnel
•Ensure that only trained personnel are deployed whose training and experience enable
them to recognise risks and avoid potential hazards.
•Staff should be given regular training on using the device, and in particular regarding
sudden events.
•Only allow trainee staff to work on the device when they are being supervised by
qualified personnel.
•Check the safety awareness of staff regularly.
•Define staff responsibilities according to qualification and job description.
•Provide staff with personal protective equipment (PPE).
•Ensure that the following conditions have been met:
–Staff have read and understood this Manual, and in particular the chapter on
Safety.
–Staff are aware and take note of the relevant accident prevention and safety
regulations.
–Staff wear the designated personal protective equipment (PPE) when working with
the device.
2.3.3 Workstation and device
•Ensure that there is sufficient lighting and ventilation at the workstation.
•Ensure that the exhaust air is properly conducted outside.
•All signs on the device must be kept in a legible condition.
•Ensure that all inspections and servicing work prescribed in this Manual are carried out.
2.3.4 Qualification of personnel
Work/operating phase
Qualification
Transport
Installation
Commissioning
Operation
Controlling
Servicing
Disposal
Qualified employee who has been trained in
the safe use of the device.
Work on the electrical equipment on the
device
Electrician who, on the basis of his/her
training, knowledge and experience is able

Safety
11
Work/operating phase
Qualification
to evaluate the work assigned and
recognise potential hazards.
2.3.5 Personal protective equipment (PPE)
Work/operating phase
Personal protective equipment (PPE)
Transport
Installation
Safety footwear
Commissioning
Installation of additional equipment
Servicing
No PPE needed.
Disposal
Safety footwear
Normal operation (operation and control)
Hearing protection
Possibly protective gloves to remove
extremely hot or cold sample material.
Protective gloves and goggles for cryogenic
grinding using liquid nitrogen.
2.4 Protective Equipment
Emergency stop switch
The device is not fitted with an emergency stop switch as standard. In an emergency it must
be shut down by pressing the main button or by disconnecting the device from the power
supply.
Hood lock
The MM 500 control is equipped with an automatic hood lock . Once a grinding process has
started, a magnetic clamp firmly closes the hood of the device. If the hood is nevertheless
opened during a grinding process, the process is interrupted and the device comes to an
immediate halt. An appropriate error message is then displayed on the touchscreen.
2.5 Repairs
This manual does not contain any repair instructions. For safety reasons, repairs may only be
carried out by Retsch GmbH or an authorised representative or by qualified service technicians.
In case of repair, please inform…
…the Retsch GmbH representative in your country,
…your supplier, or
…Retsch GmbH directly.

Safety
12
Service address:
2.6 Preventing risks during normal operation
The failure to comply with the following safety instructions constitutes improper use and
presents a risk to personnel and to operational safety.
Transport and installation
•Do not carry the device by yourself during transport and installation.
•Wear safety footwear for transport and installation.
•Only connect the device to sockets with a PE protective conductor.
•When connecting the device, the values on the type plate must correspond to those for the
power connection.
Operation
•Read the manual before commissioning the device.
•Only operate the device at a workstation of sufficient size that offers adequate stability.
•Check the mains lead for damage before operating the device.
•Never operate the device if damage is visible or suspected.
•Only operate the device according to the technical application limits.
•During operation, do not wear any jewellery, wear your hair down or wear a tie or similar
loose item of clothing.
•Wearing hearing protection during operation.
•Before operating the device, take measures that take account of restricted communication
during operation of the device.
•Pay attention to your surroundings during grinding because the noise makes it more difficult
to pick up acoustic signals.
•Do not operate the device in potentially explosive atmospheres.
•Take note of the safety data sheets for the samples and follow instructions by taking
appropriate measures in advance.
•Do not grind any explosive and/or flammable substances.
•Do not grind any substances that might become explosive and/or flammable during
grinding.
•The components that come into contact with sample material can get very hot or cold during
operation. Before removing the samples, wait for the temperature to adjust, and wear
protective gloves if necessary.
•Always wear protective gloves and goggles when handling liquid nitrogen for cryogenic
grinding.

Safety
13
•Under no circumstances fill liquid nitrogen or dry ice into the grinding jar and then close the
jar. The high pressure that arises in the jar would burst the grinding jar open.
Servicing and repair
•Before servicing, switch the device off at the main switch.
•Only clean the device with a dry or damp cloth.
•Do not clean the device with compressed air.
•Have all repairs carried out by the device manufacturer or by an authorised agent.
2.7 Preventing damage to equipment
•Protect the device against condensation if large fluctuations in temperature are to be
expected (e.g. during air transport.
•Do not knock, shake or throw the device during transport and installation.
•Comply with conditions at the installation site when installing the device.
•Under no circumstances fill liquid nitrogen or dry ice into the grinding jar and then close the
jar. The high pressure that arises in the jar would burst the grinding jar open.
•Only clean the device with a dry or damp cloth.
•Do not use any solvent or aggressive detergent for cleaning.
•Only use original spare parts for maintenance work.
2.8 Confirmation Form for the Managing Operator
This manual contains essential instructions for operating and maintaining the device which must
be strictly observed. It is essential that they be read by the user and by the qualified staff
responsible for the device before the device is commissioned. This manual must be available
and accessible at the place of use at all times.
The user of the device herewith confirms to the managing operator (owner) that he has received
sufficient instructions about the operation and maintenance of the system. The user has
received the manual, has read and taken note of its contents and consequently has all the
information required for safe operation and is sufficiently familiar with the device.

Safety
14
The managing operator should for legal protection have the user confirm the instruction about
the operation of the device.
I have read and taken note of the contents of all chapters in this manual as well as all
safety instructions and warnings.
User
Surname, first name (block letters)
Position in the company
Place, date and signature
Managing operator or service technician
Surname, first name (block letters)
Position in the company
Place, date and signature

The Mixer Mill MM 500 control
15
3 The Mixer Mill MM 500 control
The MM 500 control is a powerful ball mill which can be used for dry grinding, wet grinding and
cryogenic grinding with a frequency of up to 30 Hz. It is the first ball mill on the market that
allows controlling and regulating the temperature of the grinding process. The grinding jars are
placed in two supports in the working chamber of the machine and rest on thermal plates as
soon as they are clamped. The thermal plates serve as heat exchangers and can be flushed
with various media to achieve a cooling effect. By means of the thermal plates, the grinding jars
are cooled indirectly from the bottom. The temperature of the thermal plates can be read on the
display.
The device enables fast grinding, mixing and homogenization of soft, medium-hard, hard, hard-
brittle and fibrous materials up to a particle size of 10 mm.
Due to the effective grinding process in a closed system, the MM 500 control ensures a gentle
sample preparation which is ready for analysis in the shortest possible time.
Depending on the properties of the material and the grinding parameters, final fineness levels
down to 0.1 µm can be achieved.
Fig. 1: The MM 500 control
The MM 500 control can be used with the following cooling options:
cryoPad (Article number 70.950.0001)
LN2
Chiller / Water tap / Cryostat
Water
Chiller / Cryostat
Water / Glycol
Chiller / Cryostat
Ethanol
Cryostat (Consultation with company Retsch)
Thermal oils

The Mixer Mill MM 500 control
16
Fig. 2: Overview of cooling options
Component
Function
1
MM 500 control - Set
“LN2comfort”
The set consists of:
Vibrating mill - MM 500 control
Nitrogen control unit - cryoPad
Nitrogen tank with internal pressure generator / Autofill LN2
150 l
2
MM 500 control - Set
“Liquid thermal fluid”
The set consists of:
Vibration mill MM 500 control
Hose set for the connection to a chiller
(Chiller is not included in the set)
3
MM 500 control
Vibration mill - MM 500 control
This laboratory device is designed for 8-hour single-shift operation at 30% duty cycle.
PLEASE NOTE: This unit must not be used as a production machine or in continuous
operation.
3
2
1

The Mixer Mill MM 500 control
17
3.1 Technical data
General specifications
Applications
Grinding, mixing, homogenizing
Area of application
Agriculture, construction materials, biology,
chemistry, electrical engineering, geology,
glass, ceramics, plastics, food,
mechanochemistry, medicine, metallurgy,
pharmacy, environment
Feed material
hard, medium-hard, soft, brittle, elastic,
fibrous
Specifications
Principle of grinding
Impact, friction
Feed size
< 10 mm
Final fineness level
~ 0.1 µm
Batch / Feed quantity
Max. 2 x 45 ml
Setting of the vibration frequency
Digital, 3 –30 Hz (180 –1800 min-1)
Setting of the thermal plate temperature
0 to –100°C (only with accessory device
cryoPad, Article number 70.950.0001)
Typical grinding time
30 seconds –30 minutes
Setting grinding time
Digital, 10 seconds (minimum) to 8 hours
(maximum)
Adjustable cooling time:
1 to 60 min (only with accessory device
cryoPad, Article number 70.950.0001)
Maximum grinding time
Up to 99 hours
Number of grinding stations
2
Grinding jar sizes
50 ml / 80 ml / 125 ml
Grinding jars (Materials)
hardened steel
stainless steel
tungsten carbide
zirconium oxide
Sensors
Temperature, pressure (optional)
Operation
4.3 inch touch display with dial
Storable SOPs (Standard Operating
Procedures)
12
Programmable cycles
4 (up to 99 repetitions)
Dimensions W x H x D closed
690 x 375 x 585 mm
Dimensions W x H x D open
690 x 676 x 585 mm
Dimensions W x H x D closed with transport
aids
860 x 375 x 585 mm
Dimensions W x H x D closed with cryoPad
690 x 485 x 585 mm
Dimensions W x H x D opened with cryoPad
690 x 770 x 585 mm
Weight, net
~ 62 kg
Conformity
CE
Electrical specification
Communication
myRetsch Web Portal, Retsch APP
Mains connection
1-Phase, 100 –130 VAC 50/60 Hz,

The Mixer Mill MM 500 control
18
Electrical specification
200 –240 VAC 50/60 Hz
Apparent power
750 VA
Protection rating
IP 30
Electromagnetic compatibility
IEC 31326-1:2012
EMC class according to DIN EN
55011:2009
EN61000-4-2
EN61000-4-3
EN61000-4-5
EN61000-4-6
EN61000-4-11
Hydraulic specifications
Permissible operating pressure
0 to 5 bar
Typical operating pressure of the through-flow
cooling units
1 to 2 bar
Permissible operating pressure for liquid
nitrogen
1.2 to 1.4 bar
Internal channel volume
approx. 0.32 L
Number of hydraulic connections
4
Number of inlets
2
Number of returns
2
Connection thread at the device inlet
Internal thread G ¼"
Connection to the sample cooling unit (chiller,
cryostat)
via hose set (Art. No. 02.707.0188)
Connection thread hose set
External thread G1/4"
External thread G 3/8"
Is the operation as an open system possible?
Yes
Is the operation as a closed system possible?
Yes
Materials in contact with liquid (material
incompatibilities)
Stainless steel 1.4305
Stainless steel 1.4301
Steel galvanized
Nickel-plated brass
Thermal specifications
Can the grinding stations be cooled
individually?
yes
Are comparative measurements
cooled/uncooled possible?
yes
Number of grinding stations that can be cooled
2
Number of grinding stations
2
Largest temperature-controlled grinding jar
volume
2x 125 ml
Smallest temperature-controlled grinding jar
volume
1x 50 ml
Position of the temperature measurement
Thermal plate underneath the grinding jar
Number of temperature sensors
2
Max. permissible deviation right/left
Configurable: Off / 5 / 10 / 15 / 25 °C

The Mixer Mill MM 500 control
19
Thermal specifications
Permitted cooling media
Water
Water-glycol mixture
Thermal fluid DW-Therm (Huber
Kältemaschinen)
Liquid nitrogen LN2
Ethanol
Other cooling media on request
Temperature ranges of cooling media
+100 °C to –196 °C
Temperature of the cooling plates
+100 °C to –100 °C
3.2 Emissions
CAUTION
C.0020
Risk of injury caused by not hearing acoustic signals
Loud grinding noise
−Loud grinding noise may result in not hearing acoustic warning signals,
leading to injuries.
•Take the volume of grinding noise into consideration when
designing the acoustic signals in the working environment.
•Where necessary, use additional visual signals.
CAUTION
C3.0077
Risk of hearing loss
High sound level
−The sound level may be high depending on the type of material, the
number of balls used, the set grinding frequency and the grinding time.
Excess noise in terms of intensity and duration can lead to impairments or
permanent damage to hearing.
•Ensure you take suitable soundproofing measures.
•Wear hearing protection if there is loud or lasting noise.
Noise levels:
The noise levels will also be influenced by the properties of the sample material.
Example 1
Receptacle
2 (125 ml)
Grinding component
18 steel balls each (15 mm)
Feed material
Silica sand (~ 0.5 mm)
Feed quantity
60 ml
Speed
35 Hz
The workplace-related equivalent sound pressure level under these operating conditions Leq =
77 dB(A).

The Mixer Mill MM 500 control
20
Example 2
Receptacle
2 steel grinding jars (125 ml)
Grinding component
50 steel balls each (10 mm)
Feed material
Silica sand (~ 0.5 mm)
Feed quantity
60 ml
Speed
35 Hz
The workplace-related equivalent sound pressure level under these operating conditions Leq =
74 dB(A).
WARNING
W2.0000
Risk of injury caused by liquid nitrogen
Use of liquid nitrogen during cryogenic grinding
−Liquid nitrogen has a boiling point of –196 °C and causes burn-like
injuries and frostbite if there is skin and eye contact.
•Take note of the liquid nitrogen safety data sheets.
•Always wear goggles and protective gloves when using liquid
nitrogen.
CAUTION
C4.0002
Risk of injury and danger of frostbite
Bursting of the inlet hose.
–Depending on the operating state of the device, liquid nitrogen may be
enclosed in the supply line. When heated this may lead to the inlet
hose bursting.
•The maximum pressure in the external liquid nitrogen supply line
may be a maximum of 1.5 bar. The use of a safety valve is
absolutely essential!
The connection for the liquid nitrogen (LN2) is a G 1/4 inch threaded connector .
The operating pressure in the liquid nitrogen supply line should be at least 0.5 bar. The lower
the pressure of the liquid nitrogen supply line, the longer the precooling takes. At 0.5 bar supply
line pressure and with the system at room temperature, precooling requires approx. 10
minutes. Depending on the application, you can execute up to 4 grinding operations with 50
litres of liquid nitrogen.
Throughout the entire duration of cooling, the air humidity in the chamber condenses on all
cooled parts as a layer of ice .
After cooling this condensation drips into the collecting filter and evaporates.
CAUTION
C5.0002
Risk of injury and danger of frostbite
Uncontrolled escape of liquid nitrogen
–There is a risk of injury in the event of an uncontrolled escape of liquid
nitrogen.
•Stop the liquid nitrogen supply line immediately!