Sennheiser MM 400-X Operations Instructions download pdf (Page 10)

2/8/2012 10 Retsch GmbH

Do not use ceramic or natural stone milling cups for

milling graphite or graphite mixtures.

The high lubricating properties of graphite cause high

milling ball speeds, the energy of which cannot be

absorbed by the material owing to its low density.

For this reason there is a danger that the ceramic

or natural stone inserts of the milling cups will be

destroyed by the ball/s.

For further information our application laboratory will

be pleased to assist you.

Protective equipment

The milling chamber of the laboratory mill MM 400 is

enclosed by a strong covering hood.

Starting the machine is possible only with the hood

closed.

Emissions

Noise characteristic values :

The noise characteristic values are also influenced by

the properties of the material to be milled.

Example 1:

Intensity of sound L

= 71.4 dB(A)

Emission value related to

workplace L

pAeq

= 61 dB(A)

Operating conditions:

Container:

2 steel milling cups of 25 ml

Milling organ:

1 steel ball 20 mm

Material charged:

Quartz crushed pebbles approx.

4.0 – 6.0 mm

Charged quantity:

8ml

Example 2:

Intensity of sound L

= 76 dB(A)

Emission value related to

workplace L

pAeq

= 65 dB(A)

Operating conditions:

Container:

2 steel milling cups of 5 ml

Milling organ:

2 tungsten carbide balls 8 mm

Material charged:

Quartz crushed pebbles approx.

1.0 – 1.5 mm

Charged quantity:

1.5ml

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Sennheiser MM 400-X Operations Instructions Page 10

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