Maintenance and care
47
More about the RCF value
The relative centrifugal force (RCF) is given in multi-
ples of the earth gravity g. It is a dimensionless num-
ber 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 centrifugation
:
RCF
n
r=∗
∗1118
1000
2
.
r = radius of centrifugation in cm
n = speed in rpm
The maximum RCF value refers to the maximum
radius 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.
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 opera-
tion (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 an increase) or
(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 can now
raise or lower the run
time in 1-minute incre-
ments.
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