Cannon Instrument CT-1000 (Contant Temperature Bath) - Manual (Page 17)

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CANNON ® CT-1000 Constant Temperature Bath Instruction & Operation Manual
Revision 3.1e—June, 2011; CANNON ® Instrument Company
2139 High Tech Road • State College, PA • USA 16803
NOTE 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 approxi-
mately 3°C below the desired bath temperature. Temperature stability
below ambient temperature may be limited by the flow rate of the cool-
ant.
Adjusting the High Temperature Limit Control
Using a screwdriver, slowly turn the LC- TEMPERATURE ADJUST
control counterclockwise until the OVERTEMP message lights up on the
LC PUSH TO RESET button.
Turn the control clockwise approximately 1/4 to 1/2 turn.
Push the LC- PUSH TO RESET button. If the bath doesn’t recover,
repeat step 2 and try again.
NOTE The temperature may change slightly when you set the Limit Control, but
the bath temperature will quickly stabilize.