Du Pont SORVALL RC-5 Service Manual page 185

Calibration Procedures
Sorvall®
Centrifuges7-5.
Test
Equipment
RequiredVolt/Ohmeter:
Simpson 260, Triplet
(FET-310)
or
equivalent.Precision
Resistor.
149.79
ohm.
0.1%.
Precision
Resistor.
106.15
ohm.
0.1%.Ammeter
(clamp-on
type):
Triplet
Model 10
or
equivalent.Portable
TachometerThermometer:
McAlaster No.
39682
(-35°C
to
-50°C)
or
equivalent.7-6.
Calibration
Proceduresa.
Speed
Indicator
Ml 01
Zero
AdjustThe
meter pointer should indicate zero at zero rotor
rpm.1.
Set the
main
circuit
breaker to
OFF.2.
While
gently tapping
face of indicator
Ml
01,
turn front
access
zero adjust
clock¬wise.
until
pointer aligns
with
zero Indication
during
the
upswing.b.
Temperature
Indicator
M102
Zero
AdjustThe
temperature pointer (black)
should
indicate
-20°C
when the main circuit breaker
isat
OFF.1.
Set
the
main circuit breaker to
OFF.2.
While
gently tapping
the
face
of
M102, turn the front
access zero
adjust
until
thetemperature
pointer aligns
with
-20°C
indication.c.
Speed Control
Potentiometer
R106This
is
a mechanical alignment
of SPEED
selection for reference
only.1.
Turn the
SPEED
control
knob
fully counterclockwise, then loosen the two
knob
set-screws.2.
Align
the knob 0
(zero)
indication with the SPEED
indication and secure
the
twosetscrews.d.
Source
PowerThis
is
a
check of the main
power
to
assure proper operation
of
centrifuge.1.
Check the
source
voltage.7-2