Thermo Electron SORVALL RC3BP, Operating Instructions Manual

Page: 23 / 64

3-6
Controls, Indicators, and Displays SORVALL

Centrifuges
During a run, to view in an alternative duration control mode (for
example, to monitor accumulating TIME when an ACE run is in
progress), press one of the other two duration control keys once –
this changes the RUN display to show an accumulating value in
that alternative mode without altering the way duration is controlled.
In this viewing condition, the SET display field header does not
change, nor will the status of the ACE indicator (both continuing to
indicate the set control mode), but the SET value will change to
show the last value entered in the alternative mode. If you press the
same key a second time, the run will then change to that control
method, using the value that was in the SET display as the controlling
value until a different one is entered.
NOTE
If you change the duration control mode to TIME during
a run, time begin to will count down from the set value
the moment the change is made (unless the run was
previously controlled by time, in which case the run will
resume counting down from the value that existed when
the TIME mode was exited). If you change mode to ACE
control, the set value that exists at the moment the
change is made will control run termination, so that if
you change to ACE after the run has exceeded the set
value, the run will terminate immediately.
Between runs, the RUN display shows the previous run duration
values, viewable in each control mode. Pressing TIME shows the
MIN:SEC value at termination (the SET display shows the last
TIME input value). HOLD shows the total MIN:SEC value after
deceleration to zero. After an ACE controlled run, ACE shows the
total ACE value after deceleration to zero (the termination value is
in the SET display). If the previous run was not controlled by ACE,
pressing ACE shows the ACE value at termination (the SET display
shows the last ACE input value).
Always be sure of the control method
and value before pressing START.
TEMP
is pressed to change desired calculated sample temperature
(
°
C) that is controlled by the centrifuge during a run. The centrifuge
automatically considers the rotor selected, rotor speed, run time, set
temperature, and measured temperature to calculate and maintain
sample temperature during the run. The calculation assumes that
the sample temperature, rotor assembly temperature, and SET
temperature are all equal at the start of the run (as they must be any
time that temperature control is critical).
RECALL is pressed to access program memory. Saved parameters
are recalled by inputting a specific program number. By pressing
START, you begin a run using the run parameters displayed. Also,
programs can easily be recalled and modified to create new run
parameters without fear of damaging the original program, because
information that is saved in memory cannot be overwritten by
using the RECALL key (modifying or replacing a program is reserved
for the SELECT SAVE RUN option under the MENU key).