Thermo Electron SORVALL RC3BP, Operating Instructions Manual

Page: 21 / 64

3-4
Controls, Indicators, and Displays SORVALL

Centrifuges
SPEED
TIME TEMP
ROTOR
ACE
HOLD
RECALL
Primary Function Keys
and HOME Screen Fields
The Primary Function keys are the blue keys below the SET display.
Each key is positioned below a corresponding field in the HOME
screen, allowing simple, direct access to basic run parameter controls:
ROTOR is pressed to specify a different rotor than the one shown in
the SET display, as would be necessary if the rotor or bucket/
carrier system installed in the centrifuge were to change. Rotors are
listed by rotor name, and ROTOR can be pressed again and again to
scroll through the compatible rotors for selection. Correct
identification of the installed rotor is required to establish set SPEED
limits, correctly calculate RCF, and accurately control sample
temperature. If a rotor is able to use buckets/carriers with different
maximum radii, each configuration will be listed for selection (for
example, the ROTOR field's H6000A M and H2000B M listings, for
designating microplate carrier use), to calculate the different RCF.
The ROTOR key is not active when a run is in progress.
NOTE
To ensure that the installed rotor will always be correctly
identified, make it a practice to change the SET rotor
name immediately after changing the installed rotor.
SPEED
is pressed to specify a different rotor speed in revolutions
per minute (rpm) or relative centrifugal force (RCF, also known as
g -force) than the value shown in the SET display. Speed is selectable
from 400 to 6000 rpm, up to the maximum rated speed for the
specified rotor, or as an equivalent RCF calculated at the maximum
radius of the specified rotor (rotor geometry only; with no accounting
for adapters). Changing from rpm to RCF or RCF to rpm is done by
repeatedly pressing SPEED: pressing once causes the value to flash
so a change can be made in that mode, pressing again changes to
the other mode and displays a value equivalent to the previous,
pressing again causes that value to flash so a change can be made,
pressing again changes the mode back, and so on. An entered value
will continue to flash (prompting input) when it is out of range for
the SET rotor. The formula used to calculate RCF is:
(
rpm
1000
)
RCF = 11.17 x radius in cm x
2