April 2000

Misc

Use safety transmitters to reduce costs and improve reliability

Here’s how transmitters designed for critical use can save thousands of dollars and still provide a high level of plant safety and fewer false trips

W. M. Goble, Siemens-Moore Process Automation, Inc., Spring House, Pennsylvania       Comments? Write: editorial@HydrocarbonProcessing.com Petrochemical plants and refineries are increasingly using a safety instrumented system (SIS) to complement the process control system. Such safety systems often use specially designed PLCs, called "safety PLCs," with the goal of providing a high level of risk reduction (a measure of safety). While SISs using safety PLCs have been applied successfully to aid in ri

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