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The Ecodyst HPC controllers have two distinct controllers, and it is crucial to comprehend what each controller
performs to fully benet from the safety advantages of the HPC Models.
3.3 Setting the Controller for Safe Operation
The primary process controller, indicated by the meter at the top with the name “Setpoint
Controller,” oversees all elements of temperature regulation, including heating, cooling,
maintaining the temperature, tuning, etc. This controller is programmed with the preferred
solution temperature or process temperature.
The heating process is entirely under the control of the meter on top, and is not aected by
the meter on the bottom labeled “High Limit Controller”. This device serves as a backup or
watchdog for the setpoint controller by keeping track of the reaction or process’s temperature
and taking over in the event of a heating fault. In a typical operation, a temperature that
is several degrees (≈ 5o C) higher than the temperature put into the setpoint controller is
programmed into this controller. The setpoint controller loses power if the process reaches
the temperature set by the High Limit controller. Until the temperature drops and the entire
controller is manually reset by pressing the reset button, it is powerless.
With the HPC controllers, experiment setup is quite easy. The following instructions highlight how this can be done:
• Connect the power chord (14) of the controller to an electrical outlet.
• Connect the dual element thermocouple to the controller via the temperature sensor input (12).
• Place the dual element thermocouple in the process to be heated and turn the controller on.
• Turn ON the controller using the main switch (10).
• Push the reset button (9) to start the power ow through the system.
• Enter the desired temperature into the setpoint controller (i.e., the meter on the top) (for example 60° C) then a
slightly higher temperature into the High Limit controller (for example 65° C). Press the reset button (9).
• The process is heated to 60 °C by the setpoint controller, which will hold the temperature there until it is
adjusted. Only when the process temperature reaches a high limit set temperature, for whatever reason,
does the High Limit controller kick in. At that point, power to the entire system is cut o until the process
temperature drops below the setpoint, and the reset button (9) is pressed.
• The High Limit controller’s functionality may be checked at any time by entering a temperature lower than
the process temperature lower than the readout on the High Limit Controller. This should trigger the over-
temperature safety circuit and turn on the reset light (10) whenever there is an over-temperature situation.
High Powered Heating Mantle Controllers
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