Retsch DM 400 - Manual (Page 37)

Working with the disc mill
37
Before switching the device on, care must be taken that
the grinding chamber is locked and the sample material
container is placed straight in the insert and is not
twisted!
CAUTION!
Switch the device on before filling material in the hopper.
1. The cover of the hopper is secured by a quarter turn quick re-
lease fastener. To open the lid, turn the quick release fastener a
quarter turn in an anticlockwise direction!
2. Fill the sample in the hopper
3. Add only as much material as will allow the hopper cover to be
closed!
4. To close the cover you must press the pins on the quick release
fastener into the grooves on the hopper and lock again with a
quarter turn in a clockwise direction!
5. Monitor the grinding process (grinding noise) and determine the
optimum feed quantity! Repeat this with each new material.
6. Only add more material once the grinding noise has reduced!
7. The maximum feed quantity depends on the grindability of the
material and the collecting volume of the sample material con-
tainer.
8. Place large lumps of material (max. 20mm edge length) individu-
ally in the hopper, close the cover and secure!