Experts, please help explain the function of control instruments in PID
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Do any of you experts know what function table FN20201 in Figure 1 serves? What is the function of it and the switch HS20201? What is the function of IS303 behind the level switch LS30103 in Figure 2? What are the functions of the two FNs in Figure 3 and the FHS behind them? What do P and T at both ends of FIQ in Figure 4 represent? Help to answer, thank you
What is the function of IS303 behind the level switch LS30103 in Figure 2? Identifying LS30103 can trigger the IS303 interlock. What do P and T at both ends of FIQ in Figure 4 represent? It should be pressure and temperature that provide temperature and pressure compensation for the FIQ; I can’t see the role of the other two factors. You might want to check your logic descriptions, or the documentation related to complex circuits, or consult the process engineers.
Thank you. The PID diagrams provided by the design team don’t include any explanations, which makes them confusing; I’ll need to ask the design institute for clarification
Got it – it’s the SIS system, haha