Loading The Angle Rotor; Loading And Overloading Of Rotors; Rotor Identification; Removing The Rotor - Hermle Z 287 A Operating Manual

OPERATING

2.1.2 Loading the Angle Rotor

Rotors must be loaded symmetrically and with equal weight, (see Figure 9 and 10). The adapter may
only be loaded with the appropriate vessels. The weight differences between the filled vessels
should be kept as low as possible. Therefore, we recommend to weigh with a balance. This reduces
the wear of drive and the acoustic operating noise.
Each rotor indicates what the maximum capacity is per hole. (It is allowed to operate e.g. a 24-place-
rotor with 2 or 4 loaded tubes only, but the loaded borings must be opposite of each other).
Figure 9: WRONG

2.1.3 Loading and Overloading of Rotors

All approved rotors are listed with the maximum speed and maximum filling weight in, Table 2:
Permissible Net Weight, (see APPENDIX P. IV).
The maximum load permitted for the rotor is determined by the manufacturer, as well as the
maximum speed allowed for this rotor (see label on rotor), must not be exceeded. The liquid the
rotors are loaded with, should have a max. homogeneous density of 1.2 g/ml or less when the rotor
is running at maximum speed.
In order to spin liquids with a higher density, the speed has to be reduced, according to the following
formula:
Reduced speed n
Example:
If In case of any questions, please contact the manufacturer!

2.1.4 Rotor Identification

The model Z 287 A comes with an automatic rotor identification system. Place the rotor on the motor
shaft as described in 2.1.1 and close the centrifuge lid. The centrifuge immediately recognizes the
rotor and shows its item number on the display.

2.1.5 Removing the Rotor

Untighten the rotor nut completely, counter-clockwise. Lift the rotor vertically out of the centrifuge
(see Figure 7 and Figure 8).
14
1,2
=
√
red
ℎ����ℎ���� ��������������
1,2
n =
√
red
1,7
Z287A_V1.19_
Figure 10: RIGHT
x max. speed (n ) of the rotor
max
x 4.000 = 3.360 rpm
eng © Hermle Labortechnik GmbH