Labnet Z100A Clinical Lab Centrifuge - Manual (Page 6)

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4. Proper loading of the rotor
4.1 The rotor has been designed to handle samples with a maximum density
of 1.2g/ml. Tubes should not be run with any substance having a density
above 1.2g/ml.
A partially loaded rotor may be centrifuged. For example, you may
operate a 6-place rotor with 2, 3 or 4 loaded tubes, but it is important
that the occupied tube shields are symetrically arranged. (see sketch A).
4.2 When loading the rotor you should proceed according to sketch A. Fill
the tubes equally by eye and insert them into the tube shields of the rotor.
The difference in weight between the tubes should not exceed 2 - 3
grams.
empty tube
shields
loaded tube
shields
Sketch A: Examples of properly loaded rotors.