4
Operation
Entering parameters
Thermo Scientific
Sorvall Legend X1R
4-5
2. Enter the desired value using the numeric pad.
The digits show in sequential order.
3. Confirm your entry by pressing
.
Your entry will be automatically confirmed if you do not press any key for 5 seconds.
Run time preselection
1. Press the
key in order to open the runtime selection menu.
The display shows the message
Set Time
.
Enter the desired runtime in hh.mm
2. Press the
key repeatedly to switch over to mm:ss or Hold mode respectively.
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 (RCF) 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.
RCF
11 18
,
n
1000
-------------
2
r
×
×
=
