5 Barnstead|Thermolyne • 800-553-0039
Principles of Operation
Furnace:
The furnace chamber is heated by four electric resistance heaters which are embedded in a refractory
material. The chamber is insulated with a ceramic fiber insulation. The control is located under the
furnace chamber and is well insulated from the heat generated in the furnace chamber. A door safety
switch removes power to the heating elements whenever the furnace door is opened. The choices of
temperature controllers are as follows:
Temperature Controller: "Basic Automatic":
The basic automatic control provides simple automatic control to one setpoint temperature. A single
digital display will indicate either furnace chamber temperature or setpoint temperature. This controller
does not provide over temperature protection.
Temperature Controller: "Automatic":
This furnace controller consists of a microprocessor based three mode temperature controller having
adjustable over temperature protection and appropriate output switching devices to control the furnace.
Temperature Controller: "Programmable":
This furnace controller consists of a microprocessor based three mode temperature
controller/programmer with adjustable over temperature protection and appropriate output switching
devices to control the furnace.
NOTE
When in the program RUN mode, the programmer/controller serves to provide a
programmed temperature profile as described earlier. When in the AUTOMATIC mode, the
unit serves as a single setpoint automatic temperature controller.
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