CANNON Instrument Company | Appendix III – Adjusting Trimpots (Potentiometers)
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Appendix III – Adjusting Trimpots
(Potentiometers)
The ten trimpots located immediately behind the front control panel can be accessed by pulling the
drawer forward a few inches. An opening in the drawer cover allows direct access without the
necessity of removing the cover. The trimpots are adjusted with a small screwdriver as shown in
Figure 18.
Figure 18: Adjusting Potentiometers
There is one trimpot corresponding to each of the set temperatures on the dial. These are normally
set so that the
Temperature Adjust FIXED
dial is at the midpoint (500 on the ten-turn dial) of range
when at the control temperature. Setting the
Temperature Adjust FIXED
dial at the midpoint
ensures maximum adjustment in either direction to establish the desired temperature if additional
adjustment is necessary.
If a temperature other than one that is available on the
Temperature SELECT
switch is to be
accessed frequently, it is possible to obtain this temperature by adjusting the trimpot that coincides
with the
Temperature SELECT
temperature that is close to the desired temperature.
For example, if 100 °F is an often needed temperature, and 40 °C is not used, set the
Temperature
SELECT
switch to 40 °C and adjust the trimpot until the kinematic viscosity thermometer indicates
the bath is controlling at 100 °F. Note for future reference that the 40 °C position on the select dial is
Summary of Contents for CT-500
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