Patent
Temperature controller for controlling both heating and cooling
TLDR
In this paper, a temperature controller for maintaining the temperature of a process at a set point by controlling the heating input in accordance with both a proportional and reset response from the temperature deviation is presented.Abstract:
A temperature controller for maintaining the temperature of a process at a set point by controlling the heating input in accordance with both a proportional and reset response from the temperature deviation. When the deviation indicates that the temperature control requires a cooling input to the process, a gating signal is produced. Another gating signal is produced when the manipulated variable providing the heating input is below a preset value. Gating means are provided which will respond to the coincidence of the two gating signals for introducing the cooling to the process. The cooling is thus controlled in an on-off mode.read more
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