Thermo Scientific SORVALL RC-5C PLUS, User Manual

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RC-5C PLUS Controls, Displays, and Indicators
3-5
OFF/
∫ω
2
dt Switch
• If the OFF/
∫ω
2
dt switch is set to
∫ω
2
dt and the TIMED/HOLD
switch is set at TIMED when the START switch is pressed, the
TIME display will show accumulated integral value during the
run and the run will end when the preselected integral value
has accumulated.
• If the OFF/
∫ω
2 dt switch is set to
∫ω
2 dt and the TIMED/HOLD
switch is set at HOLD when the START switch is pressed, the
TIME display will show accumulated run time and the run will
continue until you press the STOP switch. However, the setting
on the switches has been interpreted as an integral value rather
than time; therefore, if you change the setting of the TIMED/
HOLD switch to TIMED during the run, the display will change
to show accumulated integral value and the run will end when
the set value is reached.
• If the OFF/
∫ω
2 dt switch is set to OFF when the START switch is
pressed, the centrifuge will operate in either a timed mode or a
continuous run (HOLD) mode, depending on the setting of the
TIMED/HOLD switch. The TIME display will show either
remaining run time (TIMED) or accumulated run time (HOLD).
During a TIMED run, the accumulated integral value can be
displayed by changing the setting of this switch to
∫ω
2 dt (the run
will still be controlled by time, not integral). Even though the
run is controlled by time, the integral value accumulates from
the time the START switch is pressed until the rotor decelerates
to 0 rpm at the end of the run.
• At the end of any TIMED run (but before the START switch is
pressed again), the integral recall value for the run can be
displayed by changing the OFF/
∫ω
2
dt switch to
∫ω
2
dt . If you
know the integral recall value of a particular run, you can then
duplicate the run by selecting the integrator mode and setting
the switches for the integral value (see Integrator Mode in
Chapter 4).