What is spilt range control?
Split range control is a control strategy used in process control systems where a single controller manages two or more control elements (such as valves or actuators) to regulate a process variable. This method is typically employed when a single control loop needs to influence multiple final control elements that have different operating ranges or functions.
Key Points of Split Range Control:
1. Single Controller, Multiple Outputs: In split range control, a single controller generates an output signal that is split into two or more parts. Each part of the signal is sent to a different control element.
2. Different Operating Ranges: Each control element operates within a specific range of the controller’s output signal. For example, the controller’s output signal might range from 0% to 100%. One valve might respond to the 0-50% range, while another valve responds to the 50-100% range.
3. Direction of Operation: The control elements can be configured to operate in different directions. For instance, one valve might open as the controller’s output increases, while another valve might close.
4. Typical Applications:
• Heating/Cooling Systems: A common example is in heating and cooling systems where one valve controls the flow of hot water (heating), and another controls the flow of cold water (cooling). The controller adjusts these flows based on the desired temperature.
• Pressure Control: Another example is in pressure control, where one valve might vent gas to decrease pressure, while another adds gas to increase pressure.
5. Advantages:
• Efficiency: By using split range control, a process can be controlled more efficiently without needing multiple controllers.
• Flexibility: It provides a flexible way to control processes with multiple operating conditions or requirements.
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