Hettich ROTOFIX 32 A Gebrauchsanweisung Seite 69

7 Software operation
7.1 Centrifugation parameters
7.1.1 Set the brake level
7.1.2 Relative centrifugal force, RCF
Display of the relative centri-
fugal force (RCF)
7.1.3 Centrifugation of substances or mixtures of substances with a density higher than
1.2 kg/dm
AB1207en
1. Switch off the mains switch.
2. Press and hold down the ▲
[IMPULSE] button simultaneously.
3. Switch on the mains switch and release the buttons.
�� Press the ▲
indicator shows the machine version and the time indicator shows
the brake level set (and/or
The machine version is set ex works and cannot be changed.
The machine version is set ex works and cannot be changed.
4. Use the
�� Level 1 = short ramp-down time.
Level 0 = long ramp-down time.
5. Press the
The relative centrifugal force RCF is dependent on the speed and the centri-
fuging radius.
The relative centrifugal force RCF is stated as a multiple of the acceleration
due to gravity (g).
The relative centrifugal force RCF is a dimensionless numerical value and is
used to compare the separation and sedimentation performance.
RCF = Relative Centrifugal Force
RPM = speed
r = centrifuging radius in mm = distance from the centre of the axis of
rotation to the bottom of the centrifuge tube.
1. Press and hold the
�� Relative centrifugal force (RCF) is displayed.
2. Release the
�� The speed is displayed.
3
The density of the substances or mixtures of substances must not exceed
1.2 kg/dm³ during centrifugation at maximum speed. The speed must be
reduced for substances or substance mixtures with a higher density. The
permissible speed can be calculated using the following formula:
Rev.: 00 / 11.2023
[RPM/RCF x 100] button and the
[RPM/RCF x 100] button repeatedly until the speed
'0' or '1' ).
[t] buttons to set the desired brake level.
[STOP] button to save the settings.
[RCF] button during the centrifugation run.
[RCF] button.
Software operation
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