Retsch AS 200 control - natural frequency - Manual (Page 19)

Retsch GmbH 19
Quantities of material to be sieved
The sieve set is made up of the collecting bottom and the
analytical sieves, which are arranged one on top of the other
according to increasing mesh size.
In order to guarantee fast fractionating with an exact
result, the quantity of material to be sieved should be
adapted to the sieve diameter and the nominal mesh
sizes.
Guide values for this are given in the respective
standards for sieve analysis. According to DIN 22019 / 1
the following maximum quantities of material for sieving
are recommended:
Nominal mesh sizes Material quantities in dm³ at
200mm diameter
8 0 , 5 0 0
3 , 1 5 0 , 3 0 0
1 0 , 1 4 0
0 , 5 0 , 1 0 0
0 , 2 0 , 0 6 0
0 , 0 6 3 0 , 0 3 5
0 , 0 2 0 0 , 0 2 0
Distribution of material to be sieved
Fig.13
The AS 200 control guarantees that the material to be
sieved is uniformly distributed over the sieve bottom in all
sieving processes. The sieved material undergoes a slow
rotating movement in this process, depending on the set
amplitude or sieve bottom acceleration.
It is important here that your AS 200 control is adjusted
horizontally.
The AS 200 control can be adjusted by turning the base
supports of the casing. Fig.13
After making this adjustment it is not necessary to secure
the apparatus against further movement.
For sieving processes with only 1 to 3 sieves we
recommend that short threaded rods are used (see
accessories).
Long, projecting threaded rods disturb distribution of the
material to be sieved through their natural vibration
characteristics.