Systems with Time-Varying Setpoints (Program-Based Control)
In many technological processes (such as drying, sterilization, ceramic firing, metal heat treatment, dyeing, etc.), it is necessary to control
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When a process variable (such as temperature, pressure, humidity, or another parameter) needs to be maintained within precise, predetermined limits, a control system must be established.
In the system shown in the diagram, the regulator (controller) measures the water temperature via a temperature sensor and controls the actuator – an electric heater. The heater is turned on and off to apply the exact portion of its total power required to maintain the water temperature.
When the flow of cold water changes, the water temperature in the vessel deviates from the desired value, and the controller adjusts the heater’s power to restore the temperature to the desired level.
In this type of system, a two-position (ON/OFF), P (Proportional), PI (Proportional-Integral), or PID (Proportional-Integral-Derivative) controller can be used.
In many technological processes (such as drying, sterilization, ceramic firing, metal heat treatment, dyeing, etc.), it is necessary to control
The shown system uses the psychrometric method to measure the relative humidity in the drying chamber. The specialized controller with
