PID control principle and methods for chemical process control valves
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What are the PID control principles and methods for chemical process control valves?
PID is the control law of a regulator; to understand it properly, one needs to study a book in detail*.
Take a look at this and try to adjust it; it shouldn’t be difficult
User Manual for Brown Instrument BRCNXCS5 Series PID Controllers
What was mentioned above refers to the PID control of regulators; modern intelligent positioners also have PID control, though the specifics vary slightly depending on the model. Which model is the original poster looking for?