VWR MICRO STAR 17 Instruction Manual page 26

Preselecting RCF
1. Enter the desired value by pressing the key
You can adjust the RCF preselected value in steps of 100 xg.
2. Press the key to confirm the preselected value.
If you do not press any key, the display flashes for a few seconds The new preselected value is now
stored and the display shows the actual value.
Note The RCF value can be set to a minimum of 100 xg.
The maximum speed depends on the centrifuge variant.
The displayed RCF value is always corresponding to the maximum of centrifuge radius.
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
centrifuges, since it is independent of the type of device. Only the centrifuging radius and the speed
come into play in it:

×
RCF 11 18 ,
=
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.
Run time preselection
Note You can select a run time between 1 and 99 min or continuous operation.
1. Enter the desired value by pressing the key
the desired value shows.
You can adjust the run time in steps of 1 min.
2. Press the key to confirm the preselected value.
If you do not press any key, the display flashes for a few seconds The new preselected value is now
stored and the display shows the actual value.
Explanation of RCF value
2
n

×
------------ -
r
1000
4
repeatedly, until the desired value shows.
below the display in the middle repeatedly, until
VWR MICRO STAR 17 / 17R
Introduction and description
Entering parameters
4-5