Biobase BCBL-207 - The Operation Principles

02 The Operation Principles
The centrifuge machine helps to separate, condense or purify the different density
components ( or particles ) of the solutions by the usage of centrifugal sedimentation
principal.
After placing the centrifuge tubes with equivalent test solutions in the test tubes around the
rotors symmetrically and starting the machine, the RCF produced in the high-speed rotary of
the rotors, which are driven by the motor, separates the different density components ( or
particles ) in the test solutions. The value of RCF depends on the rotating radius “r” ( the
horizontal distance from the position of the test solutions to the axle center ) and the rotating
speed “n”, and here is the calculation formula.
RCF＝1.118×10-6n2r×g
n------------ The rotating speed ( r/min )
r------------The rotating radius ( mm )
The time ( Ts ) needed during the separation and deposition of the mixed solutions is
calculated by this formula:
27.4× ( logeRmax-logeRmin ) μ
Ts ＝ min
n2r2 ( б-ρ )
Type: Rmax------The rotating radius of the test solutions having the farthest distance with the
axle center
Rmin------The rotating radius of the test solutions having the nearest distance with the axle
center
ρ------The density of the mixed solutions ( g/cm3 )
μ------ The viscosity of the mixed solutions ( p )
n ------ The rotating speed ( r/min )
r------The particle’s radius ( cm )
б------The particle’s density ( g/cm3 )
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Benchtop Low Speed Centrifuge BCBL-207
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