4
Operation
Entering Parameters
Thermo Scientific
Heraeus Multifuge X3F / X3FR
4-5
2. Enter the desired value using the numeric pad.
The digits show in sequential order.
3. Confirm your entry by pressing ENTER
.
Your entry will be automatically confirmed if you do not press any key for 5 seconds.
Running time preselection
1. Press the TIME key
in order to open the runtime selection menu.
The display shows the message "Set Time".
Enter the desired runtime in hh.mm
Note
If an extremely low RCF value has been selected, it will be corrected automatically if the
resulting speed is less than 300 rpm. This is because 300 rpm is the lowest selectable speed.
Explanation of RCF Value
The relative centrifugal force is given as a multiple of the force of gravity g. It is a unitless numerical
value which is used to compare the separation or sedimentation capacity of various devices, since it
is independent of the type of device. Only the centrifuging radius and the speed come into play in
it:
r = centrifuging radius in cm
n = Rotational speed in rpm
The maximum RCF value is related to the maximum radius of the tube opening.
Remember that this value is reduced depending on the tubes and adapters used.
This can be accounted for in the calculation above if required.
11.18
RCF
n
1000
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〈
〉
2
r
×
×
=
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