Sigma 2-5 - Page 47

Operating Manual SIGMA 2-5, page 47 of 55
03/06
7.1 Mathematical Relations
7.1.1 Relative Centrifugal Force (RCF)
The parameters speed, RCF and the diameter of the rotor are interrelated via the
following formula:
RCF = 11,18 x 10
-6
x r x n
2
If two values are given, the third value is determined by the equation. If the speed
or the rotation radius is changed, the resulting RCF will be recalculated. If the
RCF is altered, the speed under consideration of the radius is adapted
accordingly.
r = radius in cm
n = speed in rpm
RCF without dimension
7.1.2 Density
If the density of the liquid is higher than 1.2 g/cm
3
, the allowed maximum speed
of the centrifuge is calculated according to the following formula:
n = n
max
x )/2,1( Rho
Rho = density in g/cm
3