Wet Sieving
39
Slide the splash protection from below up behind the top edge of the housing.
Retighten the two upper M4 oval-head screws (
LS
).
Fig. 16:
AS 300 control with splash protection
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9.2 Performing the Wet Sieving
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Usually, sieving processes are carried out dry. However, when agglomerates, electrostatic
charges or a high degree of fines impede the sieving process, either
or a wet sieving can be performed.
For wet sieving, a liquid, preferably water, is supplied to the sample material during the sieving
process. A condition for wet sieving, however, is that the material to be sieved does not swell,
dissolve or otherwise change in the liquid. Wet sieving is particularly suitable for materials which
are already in suspension and may not be dried.
In addition to the test sieves, a collecting pan (
AB1
) with an outlet (
AB2
) and a wet sieving lid
(
ND1
) with spray nozzle (
ND2
) are required for wet sieving. During the sieving process liquid is
introduces via the spray nozzle (
ND2
) situated on top of the upper most test sieve into the sieve
stack and, subsequently, leaving it again together with the last fraction via the outlet (
AB2
) of
the collecting pan (
AB1
).
Position the device in the vicinity of the drain point (e.g. drain in the floor). The distance
between the outlet (
AB2
) and the drain point should not be too large.
Connect the spray nozzle (
ND2
) of the wet sieving lid (
ND1
) with the liquid supply (e.g. water
tap). The inner diameter of the hose must be 13 mm.
Connect the outlet (
AB2
) of the collecting pan (
AB1
) with the drain point or a corresponding
receptacle. The inner diameter of the hose must be 20 mm. Make sure that the drain point or
the receptacle are located
below
the collecting pan (
AB1
) and that the hose has a
continuous slope down
.
