Retsch AS 200 jet, Руководство пользователя

Страница: 47 / 64

Cleaning, Wear and Maintenance
47
Before cleaning or drying the test sieves, the O-rings have to be removed. Before using and
after the cleaning the test sieves should be visibly inspected for possible damages and
impurities.
Near-mesh or clamped particles can be often removed dry after the sieving process by slightly
tapping the test sieve upside down with the sieve frame on a table. For test sieves with mesh
sizes > 500 µm a fine hair brush can be used to sweep over the outer side of the mesh fabric.
11.1.1.1 Cleaning of Test Sieves with Mesh Sizes > 500 µm
Coarse mesh fabrics with mesh sizes > 500 µm can be cleaned dry or wet easily and effectively
with a hand brush with plastic bristles (at not too high applied pressure).
11.1.1.2 Cleaning of Test Sieves with Mesh Sizes < 500 µm
Test sieves with mesh sizes < 500 µm should generally only be cleaned in an ultrasonic
cleaning-bath. As cleaning agent, water together with a standard surfactant is recommended.
The cleaning in the ultrasonic bath usually takes two to three minutes. After that the test sieves
are thoroughly rinsed with water and dried. The cleaning with strong bases or acids is generally
not recommended.
11.1.1.3 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
.
NOTICE
N15.0028
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!
11.2 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.