FRITSCH PULVERISETTE 0 - Manual (Page 31)

7.2.3.3 Feeding the rinsing liquid
At the quick-release coupling (N) on the plexiglas clamping lid with 2
rotation nozzles, connect a hose (with hose clamp), through which the
rinsing liquid can be fed. Feed just enough water or alcohol (only pos-
sible with additional pump) to prevent a backup in the sieve set.
The maximum amount of liquid is determined by 2 rotating nozzles on
the clamping lid (approx. 1.5 l/min at approx. 2 bar).
Make sure that the liquid flows evenly out of the wet sieve pan - this is a
sign of good distribution of sieving stock and liquid.
If the liquid stops flowing, it indicates that there is a backup in one of the
sieves. Close the inlet and check the sieves for a possible backup. The
overpressure caused by the backup in the sieve stack can cause irrepar-
able damage to the sieve mesh wire.
If there is a backup in the sieve set, we recommend reducing
the sample quantity, switching on the "Interval" mode or
using the intermediate sieve ring (see Ä Chapter 7.2.3.5
‘Tips for wet sieving of difficult sieving stock’ on page 32).
Make sure that the small opening (O) in the wet clamping lid is open -
only then does it prevent overpressure from developing and possible
damage to the sieve mesh wire.
Through this opening (O) in the wet clamping lid, it is also possible to
refill wetting agent if necessary (e.g. with a pipette), as wetting agent
gets washed out during lengthy sieving times.
Before adding wetting agent through the opening (O),
please stop the sieve shaker with the Stop key.
7.2.3.4 Extracting the passing particles
In order to extract the rinsed out fine particles, the outlet hose can be
connected e.g. to a suction funnel with filter paper.
Clear liquid flowing from the sieve pan indicates the end of
the sieving process.
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