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13.3.1 Continuous
operation
The centrifuge can be operated in continuous operation. Continuous operation is set by pressing the arrow key
until “ – ” appears in the run time display. Operation is only stopped by activating the
.
key.
13.3.2 Pulsed
operation
For brief centrifuging. The rotor turns at the preselected speed as long as the key is pressed down.
13.4 Brake
adjustment
With this centrifuge, the braking effect can be set to normal or low.
This can be set before a run, as follows:
1. Switch off the mains switch
2. Simultaneously press the pulse key and the arrow key in the speed area and switch on the mains switch.
Release the keys again.
3. If required press the arrow button in the speed field until the depicted display appears.
In the speed field the machine version as set by the factory and in the time field the brake setting.
Speed area
Time area
RPM x 100
START
STOP
t
Speed area
Time area
RPM x 100
START
STOP
t
Normal braking effect “1”
Low braking effect “0”
4. Set the required value, “1” or “0”, in the time area with the and arrow keys.
5. Confirm the set value with the
.
key.
See Rotors and Accessories in the Braking Times chapter.
13.5 Start centrifuging run
After setting the centrifuging parameters, start the centrifuge by pressing the
.
key.
13.6 End centrifuging run
A centrifuging run is ended by pressing the
.
key or after expiry of the set run time. Once the rotor has come to a
stop the lid lock is briefly triggered and the display flashes. The lid can now be opened.
14 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.
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.
