Preventive maintenance short guide Sigma centrifuge

Persons operating the centrifuge must have read and understood the operating manual.

1 Always load the opposite inserts/buckets of the rotors with the same accessories and fill to avoid imbalance. Tighten the rotor tie-down screw clockwise with the supplied rotor wrench.

2 Clean and dry:

Carefully remove all liquids - water and particularly all the solvents, acids and alkaline solutions

- from the rotor chamber using a cloth in order to avoid damage to the motor bearings (see fig. 1).

Fig. 1: Cleaning the rotor chamber

3 Immediately rinse off the rotor, buckets or accessories under running water if they have come into contact with any liquids that may cause corrosion.

Use a brush for test tubes to clean the bores of angle rotors. Turn the rotor upside down and allow to dry completely.

4 Clean the accessories outside the centrifuge once a week or preferably after each use.

Rubber cushions should be removed, cleaned and dried.

Use soap water or other water-soluble, mild cleaning agents with a pH value between 6 and 8 for cleaning the centrifuge and the accessories.

5 Grease the load-bearing bolts of the rotor (see fig.2) and the buckets after each cleaning with a small quantity of grease (part no. 70284).

Fig. 2: Greasing the loadbearing bolts (very thin layer)

6 Grease the motor shaft slightly after cleaning (see fig. 3) and spread the grease with a cloth.

Fig. 3: Greasing the motor shaft (very thin layer)

7 Grease the rotor tie-down screw after cleaning with grease for load-bearing bolts (see fig. 4).

Fig. 4:Greasing the rotor tie-down screw

8 Apply slushing oil (part no. 70104) to the aluminium rotors and buckets (see fig. 5) as well as to the lid seal (see fig. 6) and adapters at least once a week for protection against corrosion.

This should be performed after accessories have been cleaned and are completely dry.

Fig. 5: Applying slushing oil to an aluminium bucket

Fig. 6: Applying slushing oil to the lid seal of a bucket

9 Check the material regularly (at least once a month) for
· cracks
· visible damage of the surface
· pressure marks
· signs of corrosion
· other changes.
· Check the bores of the rotors and multiple carriers.

10 Replace any damaged components immediately for your own safety.