Centrifuge GT 2/2R
Operation | 11
3. Check if the rotor is properly installed by lifting it slightly
on the handle. If the rotor can be pulled up, then it must
be reclamped to the centrifuge spindle.
4. If available close the rotor with the rotor lid.
5. Close the centrifuge lid.
Entering Parameters
The Centrifuge GT 2/2R offers you a total of 9 acceleration
and 10 braking curves with which samples and gradients can
be centrifuged.
After the centrifuge is turned on, the last running profile
selected is shown.
Acceleration curve
1. Press the key
below the ACC display in order to open
the acceleration profile selection menu.
The display shows the message "Set acceleration".
2. Select the profile by pressing the key
, until the desired
acceleration curve shows.
Braking curve
1. Press the key
below the DEC display in order to open
the braking curve selection menu.
The display shows the message "Set deceleration"
2. Select the profile by pressing the key
, until the desired
braking curve shows.
Preselecting Speed/RCF
1. Press the key
below the “SPEED” display in order to
open the speed/RCF value menu.
The display shows the "RPM"or the "RCF"-value depend-
ing on the display setting. Press the CHANGE key
to
toggle between the two modes.
2. Enter the desired value by pressing the key
repeatedly, until the desired value shows.
Explanation of RCF Value
The relative centrifugal force is given as a multiple of the force
of gravity g. It is a unit less 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.
Running Time Preselection
1. Press the key
below the TIME display in order to open
the runtime selection menu.
WARNING:
If the rotor cannot be properly
locked in place after several attempts, then the
Auto-Lock is defective and you are not permitted
to operate the rotor.
Check for any damage to the rotor: Damaged
rotors must not be used.
Keep the centrifuge spindle area of the rotor
clear of objects.
CAUTION:
Check that the rotor is properly
locked on the centrifuge spindle before each
use by pulling it at its handle.
Be sure to check all sealings before starting any
aeorsol-tight applications.
See the information in the rotor instruction
manual.
Note:
If an extremely low RCF value has been selected, it
will be corrected automatically if the resulting speed is less
than 300 rpm.
RCF
11 18
,
n
1000
-------------
2
r
=
