NEW BRUNSWICK SCIENTIFIC G25-KC User manual

I
Guide
to Operations
REFRIGERATED/ILLUMINATED
INCUBATOR
SHAKER
MODELS
G25-KC/G25-KLC
MODELS R25-KC/R25-KLC
MANUAL
NO.:
M1164-0051
Rev.
G
NEW
BRUNSWICK
SCIENTIFIC
CO., INC.
BOX 4005 .
44 TALMADGE
ROAD
. EDISON, NJ
08818-4005
. 732-287-1200
TELEPHONE:
800-631-5417
. FAX:
732-287-4222
. TELEX:
4753012 NBSCO
INTERNET:
http://www.nbsc.com/
. E-MAIL:
[email protected]

WARRANTY
Every
instrument manufactured
by
the
New
Brunswick
Scientific
Co.,
Inc.
is
warranted
to
be
free
from
defects
in
material
and
workmanship.
This
apparatus,
with the
exception
of
glassware,
lamps
and
electrodes
(where
supplied),
is
warranted
for
one
year against
faulty
components
and
assembly
and
our
obligation
under
this
warranty
is
limited
to
repairing
or
replacing
the instrument
or
part
thereof, which
shall
within
one
year
after
date
of
shipment,
prove
to be
defective after
our
examination. This
warranty
does
not
extend
to
any
NES
products
which
have
been
subjected
to
misuse,
neglect,
accident
or
improper
installation
or
application;
nor
shall
is
extend
to
products
which
have
been
repaired
or
altered
outside
the
NBS
factory
without
prior
authorization
from
New
Brunswick
Scientific
Co.,
Inc..
In
addition
to
the
above,
all
biological
shakers
shipped
to
the
U.S.A.
and Canada
carry
an
additional
one-year
warranty.
NEW BRUNSWICK
SC1ENTWIC
•
G25-KC/KLC
&
R25-KCfKLC

CAUTION
CARE
MUST
BE
EXERCISED
IN
THE
SELECTION
OF
SPEED
ANI)
STROKE
COMBINATIONS.
UNDER
CERTAIN
LOADING
CONDITIONS,
PARTICULARLY WITH
HEAVY
AND
UNEVENLY
DISTRIBUTED
LOADS,
VIBRATION
MAY
OCCUR
AND CAUSE
DAMAGE
TO THE
MACHINE.
ALL
G25-2”
STROKE
MACHINES
ARE
LIMITED
TO
MAX
300
RPM
OPERATING
SPEED.
NEW
BRUNSWICK
SCIENTIFIC
•
G25-KC/KLC
&
R25-KCIKLC

TABLE
OF
CONTENTS
PAGE
NO.
iNTRODUCTION
Scope
of
Manual
1
Description
of
Equipment
1
Product Specifications
2
REFERENCE
MATERIAL
Supplementary Drawings
3
INSTALLATION
Inspection
4
Installation
4
OPERATION
Functional
Description
of Controls
5
Operating
Procedure
5
Operation
From
5°C
Above
Ambient to
4°C
9
Setting
the
Time Switch
11
MAINTENANCE
Preventive
Maintenance
12
Techniques
12
Corrective
Maintenance
13
Replacement
of
Drive
Belt
13
Drive
Motor Lubrication
13
Main
Housing Bearing Lubrication
13
Circulation Blower Motor
Lubrication
14
Platform Removal
14
Lid
Adjustment
14
Thermostat
Calibration
14
Overload
Protection
16
Replacement Parts
16
Clamp Mounting Hardware
Kit
19
NEW
BRUNSWICK
SCIENTIFIC
•
G25.KC/KLC
&
R25-KC/KLC

NEW BRUNSWICK SCIENTIFIC • G25-KC/KLC
&
R25-KC/KLC

INTRODUCTION
SCOPE
OF
MANUAL
This
manual
contains
the
installation,
operating
and
maintenance
instructions,
plus
a
description
of
the Refrigerated/Illuminated
Incubator
Shaker
Model G25-KC
and
G25-KLC,
manufactured
by
the
New
Brunswick
Scientific Co.,
Inc., 44
Talmadge
Road,
P.O.
Box
4005,
Edison,
New
Jersey
088
18-4005,
U.S.A..
DESCRIPTION
OF
EQUIPMENT
The
Incubator
Shaker
combines
the
advantages
of
a
controlled
temperature
incubator
with
the
efficiency
of
a continues
duty
shaking
apparatus.
In
addition, the
G25-KLC provides
a
means
to evenly
illuminate
the
chamber.
The
Gyrotory
Shaker,
Model
G25,
is
built
for
continuous
service
and
reproducible
agitation.
Acting
through
a
triple-eccentric
drive,
a
powerful
ball
bearing
motor
rotates
the
shaking
platform
horizontally
in
a
circular
orbit.
To minimize
friction
and
stress, the platform
rotates on
nine
life-time
ball
bearings
of
high
thrust
and
load
bearing
capacity.
In
addition,
the
bearing housing
is
designed
with grease
fittings
to
permit
periodic
lubrication.
The
environment
growth
chamber
is
thoroughly
insulated
and
has an
extremely
low
heat
transfer
coefficient
for
close
temperature
uniformity.
Work
is
observed
through
a
hermetically
sealed,
double pane viewing window
in
the
incubator
lid
of
the G25-KC.
An
adjustable
air
intake
vent
in
the
chamber
permits
room
air
to
circulate through
the
incubator when
required,
without
affecting
temperature
regulation.
An
automatic
switch
in the
drive
circuit
de-energizes
the
shaker when
the incubator
lid
is
opened.
To
insure
operating
temperature,
a
safety
thermostat
is incorporated
in
the
heater
circuit.
Thermostats
are
fitted with
tension
lock-knobs
to
prevent
inadvertent
change
of
temperature.
NEW
BRUNSWICK
SCIENTIFIC
• G25-KC/KLC
&
R25-KCIKLC
1

INTRODUCTION
PROD UCT SPECIFICATIONS
Temperature Range: 4°C
to
60°C
(17°C
below ambient mm
4°C).
Recovery Time: Approx. 45 sec. (at 37°C)
for
chamber to recover
to
37°C
after
lid is opened for
10
sec. with
ambient air at
25°C.
Stroke:
Rotary
motion - 1” circle
Reciprocating motion
- variable
from 0
to
3 1/2’.
Speed
Range:
Rotary
- 40
to 400
RPM
Reciprocating
- 30 to 285 RPM
Refrigeration: 1/6
Hp
hermetically
sealed.
Illumination:
Seven 30 watt
fluorescent
lamps (Gro-Lux).
Timer:
24 hour adjustable
in 10
minute increments.
Dimension (external
with lid closed): Length: 22”
Width:
45
1/2”
Height: 30 1/2”
Dimensions Chamber: Length:
22t1
Width: 34 1/2”
Height:
12 1/2” (optional king size
19 1/2”)
Drive Motor:
1/6
Hp D.C.
drive
Net Weight:
325 lbs. (optional king size 350 lbs)
Electrical:
See
Unit Specification Plate
NEW
BRUNSWICK SCIENTIFIC
• G25-KC/KLC
&
R25-KC/KLC
2

REFERENCE
MATERIAL
SUPPLEMENTARY
DRA
WINGS
Supplementary
drawings
are
supplied with this
manual and
are
listed as follows
Control
Schematic
Refrigeration
Schematic
NEW BRUNSWICK SCIENTIFIC • G25-KC/KLC
&
R25-KCIKLC
3

iNSTALLATION
INSPECTION
When
uncrated,
the
Incubator
Shaker
should
be
inspected
for
any
possible damage
which
may
have
occurred
during
transit. Carefully
unpack
the
Shaker
and
any
of
the optional equipment
ordered
with the
unit.
Report
any
obvious
damage
to
the Carrier
and
to
the
New
Brunswick
Scientific
Co.,
Inc..
INSTALLATION
For
efficient
temperature
control,
the
Incubator
Shaker
should
be placed
in
a
shaded
area away
from
sources
of
excessive
heat.
For
maximum
cooling
capacity,
the unit should
be
located
in
an
air
conditioned
room.
Check the
electrical
specifications
plate
on
the
Shaker
to
make certain
that the
power
supply
matches
the electrical
requirements
before
making
connections.
NEW
BRUNSWICK SCIENTIFIC
•
G25-KC/KLC
&
R25-KC/KLC
4

OPERATION
FUNCTIONAL
DESCRIPTION
OF
CONTROLS
Operating Controls
Function
Main
Power
-
Switch
Applies
power
to
the
Incubator
Shaker
Circuitry.
Shaker
-
Switch Applies
power
to
the drive
motor circuitry
through
a
cover
safety switch.
Heater
- Switch Applies
power
to
the fan
motor
and
the
heater
through
the
operation
of
both thermostats.
Cooling
-
Switch
Turns
compressor
ON.
Control
Thermostat
Controls
chamber
temperature.
Safety
Thermostat
(Heat) Secondary
thermostat,
provides
de-energizing
of
heater
in
case of
Control
Thermostat
failure.
Safety
Thermostat
(Cool)
Secondary
thermostat,
limits
cold
temperature.
NOTE:
Lid
must
be
closed
for driver
operation.
Tachometer
Indicates
speed
of
the
shaker
table
in
RPM.
OPERATING
PROCEDURE FOR
SHAKER
Set
all
switches
on
the
shaker
OFF.
Rotate
the
Speed control
fully
counter-clockwise
(minimum speed).
NEW
BRUNSWICK
SCIENTIFIC
•
G25-KC/KLC
&
R25-KCIKLC
5

OPERATION
When
a
Model
G25
is supplied,
proceed
to
step 4.2.4.
When
a
Model R25
is supplied, the
stroke
of
the
machine
must
be
adjusted first
before
loading
the
platform.
To adjust the stroke,
proceed as
follows:
a.
Remove
the
four
screws
located
near
the
platform
center
with
the
Allen
wrench
provided.
b.
Attached
to
the
“T”-wrench
provided, by a
chain,
is a
locking
pin.
Insert
the
locking
pin
in
the hole
in
the
eccentric
wheel,
and
loosen the
locking nut
on
top
of
the eccentricwheel
with
the
“T”-wrench.
Position
the
pointer
to the desired stroke
engraved
on
the
eccentric
wheel.
Each
mark
equals
1/2”
of
stroke.
(Stroke
length
is
the
total
platform movement.)
c.
After
adjusting the
desired
stroke,
tighten the
locking
nut
with
the “T”-wrench
and
locking
pin
from
the
shaker.
d.
Attach
the
platform
to
the
shaker
drive mechanism
with the
four screws previously
removed, and close
the
lid.
CWTION
WEAR
PROTECTIVE
GLOVES
AT
ALL
Open
the lid
of
the
shaker
and
load the platform
evenly.
When the
platform
is loaded, close
lid.
NOTE:
A safety
switch
is
activated
by
the
lid
which
removes power
from
the
shaker
table
motor
when
the
lid
is
opened.
Set
the
Main
Power
switch
ON.
Set
the
Shaker
switch
On and
adjust
the
speed
control
until
the desired
RPM
is
indicated
on
the
tachometer.
NOTE:
To
achieve
maximum
speed
with
low
line voltage,
variac
output
may
be
changed
from
Tap
#3
to
#4 when
operating
at maximum
speed.
NEW
BRUNSWICK
SCIENTIFIC
•
G25-KC/KLC
&
R25-KC/KLC
6

OPERATION
Tms
CHANGE
sT
BE MADE
BY
A
IJNSED
PLEcTRtcIAN
WItH
ThE
POWER
Set
the
Heater
switch
ON
and
adjust
the
thermostat
as
follows:
NOTE:
Both
thermostats
are provided
with
a
locking
tab.
When
it
is
desired
to
change
the
temperature
setting
of
either
thermostat,
the
locking
tab
must
be
held pressed
in.
The
locking
tab
should
be
released
when
the
desired
setting
is
reached.
Temperature
is
controlled
by
a
control
thermostat.
A
safety
thermostat
is
also
provided
to
prevent overheating,
should
the
control
thermostat
ever
fail.
The
control thermostat
can
be
set
a
point
that
will
bring
the incubator
chamber
to
the desired
temperature,
while
the
safety
thermostat
is
set
for
an
operating
temperature
approximately
2°C higher.
If
for
some
reason
-
the
chamber
temperature
should
begin
to
rise
above
the
desired level,
temperature
will
automatically
be
taken
over
by
the
safety
thermostat,
which
will
prevent
the operating
temperature
from
rising
more
than
2°C
above the desired setpoint.
This
condition
will
be
indicated
by
the safety
thermostat
indicator
light. Operation
of
the
apparatus
need
not
be
interrupted
in
the event
of
control
thermostat
failure.
If
necessary,
the
auxiliary
(safety)
thermostat
may
be
employed temporarily
as
a
main
thermostat,
and
may
be
set
to
regulate
the
incubator
at
the
desired
temperature,
until
the
source
of
the
failure
is
located
and
corrected.
TW
SAPETY
ThERMOSTAT
MUST OT
BE
USEl)
CONTINUOUSLY
AS
THE
PRIMARY
CONTROUER
AS
THL
WOULD
)EIEAT
ThE
SAFETY
FEATURE
OF
NEW
BRUNSWICK SCIENTWIC
•
G25-KC/KLC
&
R25-KC/KLC
7

OPERATION
The
thermostat
dials
are
divided
into
100
graduations
which have no
temperature
significance.
However,
the
thermostat
knobs
have
been
oriented
at
the number
“37”
to
correspond
with
a
control
temperature
of 37°C.
To
attain
operating temperature
of 37°C, set
the control
thermostat
at
“37”
and
set
the heater
switch ON.
The
indicator
lamp
will
light,
indicating that
the
heater
has
been
energized.
Set
the
safety
thermostat
two
graduations
higher than the
control
thermostat.
Wait
until
the
incubator
temperature
reaches
a
state
of
equilibrium
before
proceeding.
A 30
to
60 minute
warm-up
period
is required
(depending
on
operating temperature),
to
stabilize
temperature
in
the
incubation
chamber.
For operating
temperatures
above
3 7°C,
first bring
the
incubator
temperature to
3 7°C,
and
then
adjust
the
dial
setting
as
required, moving
the
knob
approximately
one
graduation
for
each
degree
of
temperature
adjustment
required.
Some
fine
tuning
may
be
necessary.
With
each
adjustment
of the
main
thermostat,
advance
the
safety
thermostat
correspondingly
so
that
it is
always
approximately
two
graduations
higher
than the
main
thermostat
setting.
NOTE:
Afresh
air
vent
is provided
on
the
left-hand
side
of
the
lid.
This
may
be
opened
by
turning
counter-clockwise.
When
it
is desired to
remove
a
flask
or
test-tube
from
the incubator
chamber,
open
the
lid.
A
safety
switch
activated by
the
lid removed
power
from
the
drive
motor.
When
the
optional
gassing
fitting are
supplied,
they
are located
on
the right-hand
side
of
the
unit
facing
the front.
One
fitting
is
used to
admit gases to
the
chamber,
the
other
is
for
removal.
The
gassing
fittings
may
also
be used
in
conjunction
with
the
vent
control
on the
right-hand
side
of
the
lid.
To
shut-down the
unit,
rotate
the
speed
control to the
minimum
setting
and
set
all
switches
OFF.
NEW
BRUNSWICK SCIENTIFIC
•
G25-KCIKLC &
R25-KC/KLC
8

OPERATION
OPERATIONFROM
5’CABOVEAMBIENT
TO
4CC
Switch on
heater
and
cooler,
the
cooling
compressor
will
be
heard
running.
Depending
on
the
temperature
setting
on
the
control
thermostat
the
light
above
it
may be
on.
Rotate
the
control
thermostat
to
the
required
temperature.
The
graduations
on
the
dial
are
approximately
one
degree but
fine tuning
to
obtain
the
required operating temperature
will be
required.
After
15
to
60
minutes
depending
on
the
temperatures
selected
the
indicator
light
above
the
control
thermostat
will start to
slowly
switch
on
and
off
showing
a
state
of
equilibrium
has
been
reached. The
cooler
is
continually
trying to
lower
the
temperature
but
the
heater is
switching on and
off
to compensate
and
retain
the
incubator
at
the selected temperature.
Observe
the
thermometer
and
adjust
the control
thermostat
until the
desired
temperature
is
obtained.
The
minimum
thermostat
is
set
during
manufacture
so
that
when
turned
frilly counter
clockwise
it
switches
the
cooling
compressor
off
when a
temperature
of
2°C is
reached.
This
temperature
was
selected
to
ensure
that
it
is
not
possible
for
the
temperature
to
drop
below
freezing
in
the
shaker.
When
the
minimum
thermostat operates
the
cooling
compressor
switches
off
and
the
indicator
light
above
it
lights.
When
setting
the
minimum
temperature
of
4
on
the
control
thermostat
make
sure
that
the
indicator
light
above the control
thermostat
is
switching
on and
off
when the
temperature
stabilizes
and
not the
indication
light above the
minimum
thermostat.
-
MINIMUM
ThERMOSTAT
MUST
E
FULLY
CONTERCLOtXW1S
Damage
can
result to the
cooler
if
a
temperature
is
selected
between
4°C and
2°C
where
the
minimum
thermostat
begins
to
switch
the
cooling
compressor
on
and off
On returning
the temperature
setting
to
a
temperature
of
5°C
above
ambient
or
above
switch
off
the
cooler.
NEW BRUNSWICK SCIENTIFIC
•
G25-KC/KLC
&
R25-KC/KLC
9

OPERATION
NOTE:
When
a
lighted lid
is
fitted
particularly
f
the
selected
level
of
illumination
is
high,
it
may
be necessary
to
run
the
cooler
to
obtain
temperatures
between
ambient
and approximately
10
°C above
ambient.
The
G25KC/KLC
are
factory
set, so
that
the
lowest temperature
is
6°C
±
2°C. This
temperature
range
was
selected
to
accommodate
variations
in
ambient
temperature
which
significantly
affect the
low
temperature
range.
This setting
was
also
selected
in
order
to
keep
the
evaporator
coil
temperature
just
above 0°C.
If
it
is
desired
to
attain
lower
temperatures,
an
automatic
expansion
valve
is
provided
to
raise
or
lower
the
gas
pressure
in
the
evaporator
coil.
Raising
the
pressure increases temperature
and
lowering
the pressure
decreases
the
coil
temperature
which
will
decrease
the
temperature
within
the
G25KC/KLC.
This
automatic
expansion
valve
is
accessed
by
removing
the
right
side
cover
of
the
control
box, locate the
cutout
in
the
black
insulation,
and
remove
the
small
black
plug
to
expose
the
knob
of
the automatic
expansion
valve.
Turning
the
knob
counter-clockwise
lowers
the
coil
temperature,
and
turning
the
knob
clockwise
raises
the
coil
temperature.
Operation
of
the
Lighted
Lid
(G25
KLC
Only)
Check
that the
lead
at
the
back
of
the
lid
is
plugged
into
the
socket
at
the
rear
of
the
shaker.
Lift
the
plastic
cover
of
the timer
and
switch
it
on.
Using
the
4
switches
on
the
lid,
select
the
level
of
illumination
required.
From
1
tube
at 30
watts
to
all
7
tubes giving
210
watts
can be
selected
in
30
watt
increments.
NEW
BRUNSWICK
SCIENTIFIC
•
G25-KCfKLC
&
R25-KCIKLC
10

OPERATION
FL
UORES
CENT
LIGHT
TIMER
The
timer
that
cycles
that
fluorescent lights
on
and
off is
located
on the
front
face
of the
G25KLC
lid.
It is
adjusted
by
first removing
the clear
plastic
window
which
is simply
pulled
straight
forward
to
remove.
The
operating time
is set
on the
switch
dial,
by
pushing
out
the
blue segments.
1 segment
= 10 mm.
To
set the
time,
turn
the
large
clock hand
clockwise
until
the
correct
time
of
day
is set
against
the switch
operating
lever
point
ensure
that the
correct
half
day
is
chosen
(24
hour
clock).
Ensure
that the
dial
clicks
into
the
fixed
position.
The light
switches must
be
in
the ON
position
for
the
timer
to
be
able to
control
them.
NEW
BRUNSWICK
SCIENTIFIC • G25-KC/KLC &
R25-KC/KLC

MAINTENANCE
PREVENTiVE
MAINTENANCE
Preventive maintenance
is
performed to
keep
equipment
in
proper
working
order.
When
periodically
performed,
preventive maintenance
will
result
in
longer
life
for
the
equipment
and
will reduce
time lost
due
to
equipment
failure.
Techniques
Cleanjpg
Use
a
clean,
dry,
lint-free
cloth,
or
a
dry
brush for
cleaning
the
interior
of
the
shaker
chamber.
If
necessary,
wipe
any parts
of
the interior with
a
cloth
saturated
with
water
or
a
commercial
scouring
cleanser.
Do
not
use
steel
wool
or
other
abrasives
which
will
mar
the
finish.
WARNING 4
DO
NOT
USE
.
CLEANING
COMPOUfl)
ThAT
IS
FLAMMABLE
OR
TOXIC
Periodic
Inspection
At
three
month
intervals,
perform the following
checks
and inspections
with
all
switches
OFF.
1.
Check
the
fuses
on
the equipment
for
good
contacts.
NOTE:
On
208
and
220 volt units,
two
fuses
are located
behind
the
rear
panel.
2.
Remove
dirt
from
the
panels,
cabinet,
wiring
cables
and
motor.
3.
Check
all
controls
and
accessible
items
(switches,
knobs,
connectors,
pilot
lights,
fuse
holders, screws,
nuts
and
bolts)
to
make sure that
they are
properly tightened.
Tighten
any
item
that
is
loose.
4.
Check
that
all
controls
operate
easily.
NEW
BRUNSWICK
SCIENTIFIC
•
G25-KC/KLC
&
R25-KC/KLC
12

MAINTENANCE
CORRECTIVE
MAINTENANCE
Replacement
of Drive
Belt
To
replace
the
drive
belt,
proceed
as
follows:
I
Set
all
switches
on
the
shaker
to
OFF.
2.
Disconnect the
power
and
cord
from
the
electrical
outlet.
3.
Remove the
screws
holding
the
left
lower
panel
when
facing
the
front
of
the
shaker.
4.
Remove
the
screws
holding the
control
panel
and
lay
the
panel
forward. This
provides
access
to
the
motor
plate
clamping
bolt
assembly.
5.
Loosen
the
bolt
on
the
motor
mounting
plate.
Switch
the
motor
and
plate
towards
the
center
of
the
shaker.
The
belt
can
now
be
removed
and
replaced.
6.
Slip
the
new
belt
over the
flywheel and
motor
pulley
and
reverse
the
procedure
for
installation
of
the
belt.
Drive
Motor Lubrication
Drive
motor
does not
require
lubrication.
Main Housing
Bearing Lubrication
1.
Set
the
main
power
switch OFF
and
remove
the
line
cord
plug
from
electrical receptacle.
2.
Remove the
six
front
panel
screws
and
carefully
lower the
front
panel.
3.
Using
a grease
gun
with
90°
head,
grease
the
fittings which
are
now
accessible
from the
front
of
the
unit.
Use
a
high-grade,
high-temperature,
ball
bearing
grease
and
lubricate
every
three
months.
DO
NOT
OVER
LUBRICATE
NOTE:
Model G25
contains
4 grease
fittings
on
the
lower
eccentric shaft
housing.
The
upper
housing
contains
sealed
bearings.
4.
After
lubrication,
replace
front
panel
and screws.
5.
Insert power
cord
from unit
to suitable electrical
outlet.
NEW
BRUNSWICK
SCIENTIFIC
• G25-KC/KLC
&
R25-KC/KLC
13

MAiNTENANCE
Circulation
Blower
Motor
Lubrication
Permanently sealed
-
no
lubrication
required.
Platform
Removal
To
removal
platform,
simply
unscrew
the 4
retaining
screws
and
lift
out.
Make
sure
retaining
screws are
thoroughly tightened
when
platform
is
replaced.
Lid
Adjustment
In
the event
the
lid
fails
to
remain
fully
raised
when
opened,
it
can
be
easily
corrected
by
a
simple
tension adjustment.
Hold
lid
fiuiy
open
and
tighten
nut in
lower
section
of
both
rear
hinges.
Thermostat
Calibration
The
control
thermostat
knob
may be
oriented
at
a
specific
dial
setting
to correspond
with
operating
temperature
of
the
equipment
by repositioning
knob
in
relation
to the
dial
plate.
In
addition,
the
high
and
low
temperature
“stop”
may
be
reset
at
a
new
position
if
it
is
not
possible
to
attain required temperature.
First
determine
whether
the
safety
thermostat
is
interfering
with the
operation
of
the
control thermostat.
If
so, the
safety
thermostat
should
be
taken
out
of
the circuit
by
rotating
the
knob
to its
highest
setting.
If
this
fails,
the
adjustable
stop
of
the
safety
thermostat
must
be
reset
to
a
new
position.
(Refer
to
steps
10-14.)
To
calibrate
control
thermostat
knob
at
37°C
(for
example)
proceed
as
follows:
1.
Remove
control
thermostat
knob
by
loosening
its
two
set
screws
(see
figure
5-1).
2.
Loosen
adjustable
stop
by
loosening
its
set
screw.
3.
Put
machine
in
operation
and
set
control
thermostat
knob
shaft
so
as to
achieve
a
temperature
of 37°C.
(It
may
be
helpful
to
first
“Key
the position
of
the
knob
shaft
as
an
aid
in
orienting
it.)
4.
Allow
temperature
to
stabilize
before
proceeding.
This
condition
will
be
apparent
when
the
heater
cycles
on and
off
at
frequent
intervals,
(as indicated
by the
heater
pilot
light).
5.
Without
changing
the
position
of
the
knob
shaft,
move
adjustable stop
until
it
is
in
contact
with
the
shaft
pin.
Temporarily
lock
the
“Stop”
in
position
to
secure
position
of
knob
shaft.
NEW
BRUNSWICK SCIENTIFIC
•
G25-KCJKLC
&
R25-KC/KLC
14

MAiNTENANCE
FIGURE
5-1
THERMOSTAT
CALIBRATION
6.
Without
disturbing
position
of
the
knobshaft,
replace
knob on
the outermost
portion
of
the
shaft,
and
point
it
to
a
setting
of”37
on
the dial.
Tighten
knob
in
new
position. (Make
sure
knob
is
firmly
in
contact
with
the ‘Adjustable
Stop”
before
it
is
secured.)
7.
Loosen
adjustable
stop
and set
it
at
a
position
so
that thermostat
knob
can
be
moved over
the
entire
scale
and
does
not
exceed
high
and low
temperature
limits.
DO
WOT
IESET
T1MOST4T
FOR
A
HI6HER
1PIATtJ1U
AN
11AT
W1U
E
8.
Lock
adjustable stop
in
its
new
position
by
tightening
its set
screw.
(The
new
temperature
attainable
at
this position
will
be maximum
[or
minimum]
that
can
be
reached.)
9.
Rotate
the
knob fully
counter-clockwise.
Loosen
the
set
screws
on
the
knob
and
push
the
knob
as
far
as
possible
towards
the
panel,
then
back out
from
the panel
1/32”.
Tighten the
set
screws
on
the
knob. This
permits
the
proper
tension
to
be
applied
to
knob
by
the
locking
tab.
After
the
control
thermostat
has been
calibrated
at
37°C,
proceed
to
calibrate
the
safety
thermostat.
NEW
BRUNSWICK
SCIENTIFIC
•
G25-KC/KLC
&
R25-KC/KLC
6
1
SET
SCREW
2
KNOB
SNAFT
3
FRONT
PANES
4
SHAFT
COLLAR
5
SHAFT
PIN
S
ADJUSTABLE
STOP
15