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

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CANNON ® CT-1000HT Constant Temperature Bath
Revision 1.1b—June, 2011; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
Preheat HEAT light will glow continuously until the bath temperature is
approximately that selected with the Temperature SELECT switch. Then
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 D), 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.
Attaining lower temperatures
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
The Limit Control is designed to prevent the bath from overheating if a
malfunction occurs. You should set the Limit Control only after the CT-
1000HT bath has reached the desired temperature.
NOTE During this procedure, the temperature of the bath may change slightly,
but will quickly recover.
1. Using a screwdriver, slowly turn the LC - TEMPERATURE
ADJUST control counterclockwise until the OVER TEMP message
lights up on the LC - PUSH TO RESET button.
2. Turn the control clockwise approximately ¼ to ½ turn.