Retsch Mixer Mill MM 500 nano, Manual

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The Mixer Mill MM 500 nano
16
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 L
eq
=
77 dB(A).
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 L
eq
=
74 dB(A).