Hettich EBA 270 - Relative Centrifugal Force (RCF); Centrifugation of Materials or Mixtures of Materials with a Density Higher than 1.2 Kg;DM

EN
14/21 Rev. 01 / 11.2022 AB2300EN_SA
16 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:
1,118r
2
1000
RPM
RCF 






 1000
1,118r
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.
17 Centrifugation of materials or mixtures of materials with a density higher than 1.2 kg/dm
3
When centrifuging with maxim revolutions per minute the density of the materials or the material mixtures may not
exceed 1.2 kg/dm
3
.
The speed must be reduced for materials or mixtures of materials with a higher density.
The permissible speed can be calculated using the following formula:
[RPM] speed maximum x
[kg/dm³]density Greater
1.2
= )(n speed Reduced
red
e.g.: maximum speed RPM 4000, density 1.6 kg/dm
3
RPM 3464 = RPM 4000 x
kg/dm³ 1.6
kg/dm³ 1.2
= n red
If in doubt you should obtain clarification from the manufacturer.