Operation
SORVALL
®
Centrifuges
4-10
SELECT BRAKE OFF?
This screen allows you to select a speed (in rpm) at which, after
termination, deceleration will transition from braking to a coast-
ing stop. The amount of time it takes for the rotor to stop depends
on the transition speed, windage and inertia of the rotor. BRAKE
OFF transition speed is set independently of set run speed, and
is not affected by changes to set run speed. If the transition speed
is set higher than the set run speed, at run termination, the
centrifuge will coast to a stop from set speed. After selection,
CHANGE OVERTEMPERATURE LIMIT? will appear in the
display.
NOTE If SLOW STOP and BRAKE OFF are both selected:
– If the BRAKE OFF transition speed is set to 500 rpm
or higher, the SLOW STOP selection will be ignored.
– If the BRAKE OFF transition speed is set below 500
rpm, the centrifuge will decelerate with full braking to
500, transition to the specified SLOW STOP rate,
then change to a coasting stop when the specified
BRAKE OFF transition speed is reached.
CHANGE OVERTEMPERATURE LIMIT?
The RC12BP™ has sample overtemperature protection that
alerts the user if the calculated sample temperature in the RUN
display exceeds SET temperature by more than a specified
amount. CHANGE OVERTEMPERATURE LIMIT allows you
to specify a maximum allowable sample temperature as it relates
to the current SET temperature, to create a new overtemperature
offset value that will be applied to future changes to set tempera-
ture. The overtemperature limit cannot be set below 2°C over the
SET temperature. The offset value will be retained until over-
written. (See CHANGE OVERTEMPERATURE LIMIT on
page 3-10 for more information.)
The RC12BP™ also has an automatic precool feature, and this
overtemperature alert feature is disabled when precooling is in
progress. The precool feature sounds an alarm and "SAMPLE
OVERTEMP – PRE-COOLING" appears in the SET display if
the calculated sample temperature in the RUN display is more
than 2°C above the SET temperature, either when START is
pressed, or during a STEP RUN, when a new program's SET
temperature is more than 2°C lower than the RUN temperature.
When CLEAR is pressed, the DEG C field in the SET display will
change to P-COOL, which will remain in the display until the
RUN temperature comes into range, or the run terminates.
After selection, CHANGE UNDERTEMPERATURE LIMIT?
will appear in the display.
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