Thermo Scientific SORVALL RC-5C PLUS, User Manual

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RC-5C PLUS Controls, Displays, and Indicators
3-3
Time/
∫ω
2
dt Switches, Display, & Indicator
The Time/
∫ω
2
dt display shows one of the following values during a
run: (1) accumulated run time if the TIMED/HOLD switch is set to
HOLD, (2) remaining run time if the TIMED/HOLD switch is set to
TIMED and the OFF/
∫ω
2 dt switch is set to OFF, or (3) accumulated
integral value if the OFF/
∫ω
2
dt switch is set to
∫ω
2
dt . Time values are
displayed in hours and minutes and integral values are displayed
as a coefficient and an exponent (for example, 15 20 means 1.5 x 10
20 ).
The indicator below the display will light if the OFF/
∫ω
2 dt switch is
set to
∫ω
2
dt .
The Time/
∫ω
2 dt switches are used to select either the desired length
of run time (hours and minutes) or the desired integral value
(coefficient and exponent), depending on the setting of the OFF/
∫ω
2
dt switch when the START switch is pressed. The centrifuge will
shut off when the preselected value is achieved, provided the
TIMED/HOLD switch is set to TIMED (if the switch is set to HOLD,
the run will continue until STOP is pressed).
Rotor Code Switches
The code number of the rotor in use must be set on these switches
for proper automatic temperature compensation, speed control,
and RCF calculation. At the beginning of each run, the ROTOR
CODE message light will flash on and off to remind you to enter the
proper code number.
TIMED/HOLD Switch
The setting of this switch determines how the run will end:
• If the TIMED/HOLD switch is set at TIMED when the START
switch is pressed, the run will end when the preselected length
of time has elapsed or the preselected integral value has
accumulated, depending on the setting of the OFF/
∫ω
2
dt switch.
• If set at HOLD when the START switch is pressed, the run will
continue until you press the STOP switch. If the setting is changed
from TIMED to HOLD during a run, the run will not end until
you press the STOP switch.