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Sorvall®
Centrifuges
Calibration
Procedures2.
Set
the
RUN
mode
set-pointer
at
10°C
to
15°C
below
indicated
temperature.3.
Set
the
HOLD
mode
set
point
to
coincide
with
the
Indicated
temperature.4.
Be
sure
that
rotor
is
secured
and
the
chamber
door
is
latched.5.
Set
the
SPEED
control
to
0
rpm.6.
Place
the
system
in
the
RUN
mode.
The
centrifuge
ON
switch
on
the
RC-5
or
theSTART
switch
on
the
RC-5B
should
light.7.
Slowly
decrease
the
HOLD
set
point
to
2°C
below
the
indicated
temperature.
Thesystem
should
transfer
to
the
HOLD
mode
—
the
centrifuge
ON
switch
lamp
shouldswitch
to
OFF
and
the
OFF
lamp
should
illuminate
on
the
RC-5.
For
the
RC-5B,
theSTART
lamp
should
go
OFF.8.
If
the
conditions
of
step
7
are
not
obtained,
adjust
R58
accordingly.n.
Compressor
Timing
Potentiometer
(R84)This
procedure
adjusts
the
HOLD
and
RUN
mode
ON
and
OFF
duty
cycles.NOTEDuty
cycle
timing
Potentiometer
(R84)
is
a
factory-set
critical
adjust¬ment,
utilizing
waveshape
and
timing
set
observations.
The
followingsteps
may
be
used
only
as
a
last
resort
in
absence
of
factory
or
depotfacilities.1.
Install
an
SS-34
rotor
and
latch
the
chamber
door.2.
Set
the
SPEED
control
to
1000
rpm.3.
Place
the
system
In
the
HOLD
mode.4.
Record
the
duration
of
the
compressor
ON
and
OFF
times
cycles,
when
the
tem¬perature
pointer
rises
above
the
HOLD
set
point.5.
Place
the
system
In
the
RUN
mode.6.
Adjust
the
RUN
set
point
pointer
to
the
left
of
the
temperature
indicator
to
turn
thecompressor
ON.7.
Record
the
compressor
OFF
time
cycle
when
the
RUN
set
point
is
quickly
moved
tothe
right
and
then
back
to
the
left
of
the
temperature
pointer.8.
Adjust
potentiometer
R84
until
the
recorded
durations
in
step
4
are
13
to
15
sec¬onds
on
and
108
to
132
seconds
off;
and
the
recorded
off
duration
in
step
7
is
36
to44
seconds.7-9
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