EN
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36
Setting rotor position 1
Only authorized skilled personnel may set rotor position 1.
If the rotor was changed and if this has another rotor code than the previously used rotor, a rotor detection
procedure must be carried out first before rotor position 1 is set (see chapter "Rotor recognition").
Every time the rotor is installed, rotor position 1 must be reset afterwards. Rotor position 1 is the position where place
1 of the rotor must be located for loading and unloading. Rotor position 1 can be set as follows when the rotor is at a
standstill:
Look through the window in the lid to make sure that the rotor is at a standstill.
Turn the key to the "TEACH" setting. For example,
Teach Open =Close
might be displayed.
Keep the
key pressed until the hatch is completely open.
Teach =Open Close
is displayed.
Press the
PROG
key. The saved rotor position 1 is displayed, e.g.
Teach Pos 1 : 1812 <Start=ok>
.
Turn the rotor slowly in an anti-clockwise direction until you hear an acoustic signal. Then continue turning until
position 1 of the rotor is in the desired loading and unloading position.. Hold the rotor in this position.
Press the
START
button to save the setting.
As a confirmation,
store Pos 1 ...
is briefly displayed, and then e.g.
Goto 1/24 2826 0 2826 s
.
If "
no zero pulse !"
is briefly displayed, the rotor was turned to the loading/unloading position before the
acoustic signal sounded. In this case, repeat the rotor position 1 setting.
If
Close the Lid !
is displayed briefly, the lid is open. In this case, close the lid.
To test the positioning, set the desired rotor place with the rotary knob , and then press the
START
key. The
rotor continues to turn until the set rotor place is in the loading/unloading position.
Press the
STOP / OPEN
key to exit the menu.
Teach =Open Close
is displayed.
Keep the
RPM
key pressed until the hatch is completely closed.
Teach Open =Close
is displayed.
Turn the key back to the "LOCK 2" position.
37
Relative centrifugal force (RCF)
The relative centrifugal force (RCF) is given as a multiple of the acceleration of gravity (g). It is a unit-free value and
serves to compare the separation and sedimentation performance.
These values are calculated using the formula below:
1,118
r
2
1000
RPM
RCF
1000
1,118
r
RCF
RPM
RCF = relative centrifugal force
RPM = rotational speed (revolutions per minute)
r = centrifugal radius in mm = distance from the centre of the turning axis to the bottom of the centrifuge
container. For more on the centrifugal radius see the chapter
“Anhang/Appendix,Rotoren und Zubehör/Rotors and accessories”.
The relative centrifugal force (RCF) stands in relation to the revolutions per minute and the centrifugal
radius.
