Retsch PM 200 - Manual (Page 24)

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Retsch GmbH
24
Suitable grinding bowls for the PM200
The PM200 is only suitable for grinding bowls of type
"Comfort" with a nominal volume of 50-125 ml.
Grinding bowl filling level
Guide values for material volumes and balls
Nominal
volume
Utility
volume
Max. feed
grain size
Recommended ball filling
 10mm  20mm  30mm  40mm
12 ml - 5 ml 1 mm 5 pieces - - -
25 ml - 10 ml 1 mm 8 pieces - - -
50 ml 5 – 20 ml 3 mm 10 pieces 3 pieces - -
80 ml 10 – 35 ml 4 mm 25 pieces 5 pieces - -
125 ml 15 – 50 ml 4 mm 30 pieces 7 pieces - -
If the filling level of the grinding bowl is too high or too low,
the end result will be impaired and the milling set could
become damaged (increased wear and tear).
Stacking 50ml grinding bowls of type "C"
It is not possible to stack 50ml grinding bowls in the PM200.
Handling grinding bowls of type "C"
X
H
Carrying and holding
The gripping edges X on the grinding bowl itself and its
cover provide secure handling.
Torsion lock
All 250 and 500ml grinding bowls of type "C" also have a
torsion lock borehole to the steel shell in the bottom of the
grinding bowl. This is only deployed in the PM100 and is
located on the labelled side of the grinding bowl shell.
Heating the grinding bowls
Depending on the grinding time and the filling level, the
grinding bowl can be heated up to 150°C during
comminution.
When the fixture is undone, the pressure which builds up in
the bowl during grinding escapes, and can also take
powered ground material with it.
When the grinding bowls are put to one side to cool, a
vacuum develops inside the bowl, which can make it difficult
to open. Grinding bowls of type "C" can therefore be levered
open by inserting a wooden bar H, for example, between
the gripping edges of the cover and the bowl.
Please take the action necessary - depending on how
dangerous the material you are grinding is - to ensure that
people are not exposed to danger.
It is essential to wear protective gloves when removing and
opening heated grinding bowls.
Danger of burning hands.