October 2000


Improve safety systems with redundant networks

This method provides reliable, fail-to-safe operation

T. Pipitone, General Monitors, Inc., Lake Forest, California       Comments? Write: editorial@HydrocarbonProcessing.com Dramatic shifts in electronics technology over the past five years have affected industrial safety system design for oil and gas applications—as well as for applications in other process industries. Multidrop serial communications networks are slowly replacing the long standard 4–20 mA current loop for measuring process variables. Two purposes are served by this change: It provides more information about the process to the process control computer and significantly reduces installation wiring costs. Instead

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