Retsch AS 200 User Manual download pdf (Page 19)

31.07.2012  Retsch GmbH 19

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.

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Retsch AS 200 User Manual Page 19