Retsch GM 300 - Manual (Page 14)

Technical data
14
The device can be started only if the housing cover is closed and can be opened
only if the motor has stopped completely.
The actual speed is displayed during operation.
The safety device checks that the grinding jar and cover are in place before the
grinding process can be started.
If the speed deviates by more than 15 %, the device will switch off automatically.
4.3 Emissions
CAUTION
Damage to hearing
The level of noise can be high depending on the type of material,
the knife used, the speed set and the duration of the grinding
process.
- Noise that is excessive in terms of level and duration can cause
impaired or permanently damaged hearing.
• Ensure suitable sound-proofing measures or wear
hearing protection.
CAUTION
Possibility of acoustic signals not being heard
Loud grinding noises
- Acoustic alarms and voice communication might not be heard.
• Consider the volume of the grinding noise in relation to other
acoustic signals in the work environment. You may wish to use
additional visual signals.
Noise characteristics:
The noise is measured in conformance to DIN 45635-031-01-KL3.
The noise characteristics are influenced by the properties of the material being
ground.
Example 1):
Sound-power level LWA = 93.5 dB (A)
Workplace-related emissions level Lp Aeq = 78.7 dB (A)
Operating conditions:
Container = plastic container with cover
Grinding organ = stainless steel knives
Feed material = quartz sand
Feed volume = 2.5 l
Speed = 3000 min
-1
4.4 Degree of protection
Grinding chamber and keyboard IP45
In the area of the ventilation slots IP20