A safety instrumented system (SIS) is distinguished from a basic process control system (BPCS) by its primary purpose, integrity requirements, and architecture. A BPCS is designed to maintain process variables (e.g., temperature, pressure, flow) within a desired operating range to optimize production and efficiency. A SIS, on the other hand, is specifically designed to prevent or mitigate hazardous events, protecting personnel, equipment, and the environment. While a BPCS aims to control the process und....
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