15
CANNON
®
CT-1000 Constant Temperature Bath
Revision 3.1a—February, 1998;
CANNON
®
Instrument Company
P.O . Box 16 • State College, PA • USA
The
Preheat
switch activates an auxiliary heater for the CT-1000. You may
turn it
ON
to heat up the bath more rapidly. You should turn the
Preheat
switch
OFF
when the desired temperature is reached if the operational
temperature is under 120°C. For bath temperatures in excess of 120°C,
the
Preheat
switch must remain
ON
to maintain temperature control. After
the
Preheat
switch has been turned
ON
, the
Preheat HEAT
light will glow
continuously until the bath temperature is approximately that selected with
the
Temperature SELECT
switch, when the light will begin to blink.
The light above the
Temperature Adjust
control will start to blink when
the bath temperature has approximated the setting on the
Temperature
SELECT
switch.
3. To adjust the bath to the exact temperature, read from the kinematic
viscosity thermometer (see Appendix F), then release the dial lock on
the
Temperature Adjust VARIABLE
dial and turn it. To incremen-
tally decrease the temperature, turn the dial counterclockwise; to
increase the temperature, turn the dial clockwise. Relock the
Tem-
perature Adjust VARIABLE
dial after each adjustment and allow
several minutes for the bath to equilibrate.
NOTE
If a desired bath temperature is within two or three degrees of one on the
Temperature SELECT
dial, it is sometimes possible to attain the tem-
perature by using the
Temperature Adjust FIXED
dial. Because this dial
has a finer adjustment than the
Temperature Adjust VARIABLE
dial, the
final temperature may be reached more quickly. If you wish to try this
alternate method, follow the procedure for fixed temperature adjustments
given on the previous page.
NOTE
To attain temperatures below ambient temperature (20-25°C), a coolant
must be pumped through the bath’s cooling coil. The coil is accessed
through the rear of the bath. Coolant temperature should be approximately
3°C below the desired bath temperature. Temperature stability below
ambient temperature may be limited by the flow rate of the coolant.
Setting the Limit Control
Set the
Limit Control
after the bath has reached the desired tempera-
ture. This will prevent the bath from overheating if a malfunction occurs.
To set the Limit Control, slowly turn the Limit Control
TEMPERATURE
ADJUST
dial counterclockwise until the
OVERTEMP
message lights up
on the Limit Control
PUSH TO RESET
button.
Turn the dial clockwise approximately one-quarter turn and relock, then
push the Limit Control
PUSH TO RESET
button.
NOTE
The temperature may change slightly when you set the Limit Control, but
the bath temperature will quickly stabilize.
