Cleaning, Wear and Maintenance
46
are thoroughly rinsed with water and dried. The cleaning with strong bases or acids is generally
not recommended.
12.1.1.3 Drying of Test Sieves
Drying ovens of various sizes can be used for drying test sieves (drying temperature < 80 °C).
Additional information concerning ultrasonic cleaning-baths and drying ovens can be found on
the Retsch GmbH homepage (http://www.retsch.com). Also ask for the free expert guide Sieve
Analysis – Taking a close look at quality.
Damage of the sieve mesh fabric
Drying temperature > 80 °C
At higher temperatures, especially fine metal wire meshes can become
warped, leading to a reduced tension of the mesh fabric inside the sieve
frame and hence, makes the test sieve less efficient during the sieving
process.
• The drying temperature for test sieves must not exceed 80 °C!
12.2 Wear
Even with the proper handling of the test sieves, a wearing of the sieve mesh fabric depending
on the frequency of the sieving operation and on the sample material is unavoidable. The test
sieves should be regularly checked for wear and damage and be replaced if necessary.
Likewise, all existing sealing gaskets should be checked for wear on a regular basis and
replaced if necessary.
Personal injury
Improper repairs
This manual does not contain any repair instructions.
• For safety reasons, repairs may only be carried out by Retsch GmbH
or an authorised representative or by qualified service technicians.
12.3 Maintenance
The AS 200 control is largely maintenance-free.
When using the sieve clamping unit "comfort" it is recommended to clean the support rods from
time to time. Furthermore, after a certain time the sieve clamping unit "comfort" produces
unavoidable, function-related clamping grooves on the support rods, which may impede secure
clamping. Therefore, it is necessary to examine the support rods in regularly intervals for
clamping grooves in the clamping area and, if required, to turn them by 90°.
Loosen the hexagonal nut (G) by means of a 19 mm open-end wrench.
Turn the support rod by 90°.
Then, tighten the hexagonal nut again.
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