21.11.2001
Retsch GmbH
24
Doc. No E98.014-016.9999 A
Working instructions
Target group
:
Laboratory technicians
Supplementary mass
The use of a supplementary mass may be required only
for 60 Hz units where, when using a small number of
analytical sieves, insufficient vibration height is attained
for your sieve analysis.
(Refer to chart on page 9.)
The auxiliary mass is mounted below the sieve stack, on
the sieve carrier plate at the AS200, and clamped at the
same time as the sieve stack.
Sieving aids
When dealing with product which is difficult to separate,
for which wet sieving is not possible (see notes in this
chapter), we recommend using sieving aids in the
individual sieve fractions. Depending on the screen size
and the vibration intensity, pearls made of agate, rubber,
china or nylon bristles and Vulkollan cubes may be used.
Ensure that the openings in the sieve mesh are not
stretched by overloading with sieving aids as this
would have a detrimental effect on the precision of
your analytical sieve.
Refer to the paragraph on product quantities for
information on suitable charges.
Retsch analytical sieves
Decisive for the accuracy and reliability of analytical
results is, in addition to a sieve shaker which works at
reproducible conditions, the quality of the analytical
sieves themselves.
Retsch analytical sieves are high-quality, high-value
measurement devices which may be used only for woven
and perforated sieves corresponding to the particular
standard. Following final inspection, each screen is
assigned a serial number and a quality certificate is
issued.
