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18
NOTE
NOTE
Adjusting trimpots
Locating trimpots
Trimpots / TA - FIXED dial
5. Turn the TA - VARIABLE switch to adjust the temperature. After
each adjustment, allow several minutes for the bath temperature to
stabilize.
Turn the switch clockwise to increase the bath temperature. Turn the
switch counterclockwise to decrease the bath temperature.
6. When the bath thermometer indicates that the desired temperature
has been reached, relock the TA - VARIABLE switch.
If the desired temperature is within 2 or 3 °C of a temperature listed on
the T - SELECT dial, it may be possible to attain the temperature using
the TA - FIXED dial. Because this dial has a finer adjustment than the TA
-VARIABLE dial, the final temperature can be more easily obtained. To
try this alternative method, follow the previous instructions, using the TA -
FIXED dial instead of the TA - VARIABLE dial.
If you are unable to attain one of the preset bath temperatures using the
procedure on pages 14-15 for preset temperature selection, it may be
necessary to adjust the trimpots (also called potentiometers), which have
been factory-calibrated to maintain the preset temperatures on the T-
SELECT dial.
Before adjusting the trimpots, follow this procedure:
1. Turn on the bath power.
2. Set the TA - SELECT switch to the FIXED (left) position.
3. Set the T - SELECT dial to the desired temperature setting.
4. Set the TA - FIXED dial to its midpoint (500).
5. Allow the bath to equilibrate.
The trimpots (see Figure 9, next page) are located immediately behind
the removable panel below the front control panel, and may be accessed
by removing the two thumbscrews which hold the removable panel in
place.
Each trimpot is labelled with a number corresponding to one of the
temperatures listed on the T -SELECT dial. These trimpots are calibrated
so that the TA - FIXED dial will be at the approximate midpoint (5 on the
10-turn dial) of its range when the bath is stabilized at the control tem-
perature (Setting the TA - FIXED dial at the midpoint ensures maximum
adjustment potential in either direction to establish the desired tempera-
ture).
®
TE-1500 Thermoelectric Constant Temperature Bath
CANNON
Revision 1.1b—January, 2007; CANNON
2139 High Tech Road • State College, PA 16803 • USA
®
Instrument Company
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