More About The Rcf Value; Selecting Run Time; Run Time Selection - Fisher Scientific accuSpin 3 Operating Instructions Manual

More about the RCF value

The relative centrifugal force (RCF) is given in multi-
ples of the earth gravity g. It is a dimensionless number
that allows one to compare the efficiency of separation
or sedimentation of diverse instruments, since it is
independent of the instrument used. The only values
entered in the equation are radius and speed of cen-
trifugation
:

n
= ∗
RCF 11 , 18 
 1000
r = radius of centrifugation in cm
n = speed in rpm
The maximum RCF value refers to the maximum ra-
dius of the tube bore.
Please note that this value decreases
depending on the tubes and adapters used.
You may take this into account when calculating the
RCF value for your application.
2

∗
 r


Selecting run time

There are two time modes: standard and extended.
In the standard time mode you can select a run time
between 1 min and 9 h 59 min or continuous operation
(hLd) .
In the extended mode you can select a run time be-
tween 1 min and 99 h (from 10 h in one-hour steps), or
continuous operation (hLd).

Run time selection

To set a time, proceed as follows:
1. Press one of the "set" keys
(for a decrease) in the "run time" section of the
control panel once to switch from the actual to the
set point mode.
2. By briefly pressing the "set" key you
Operation
(for an increase) or
can now
raise or lower the run
time in 1-minute incre-
ments.
37