3.0. Field Sensors for Safety Instrumented Systems
An SIS is a collection of SIFs, each of which is one or more components designed to execute specific safety-related tasks designed to bring an industrial processes to a safe state in the event of hazardous conditions. One major issue of SIS is to balance and optimize two different parameters, viz. maximization of facility safety (against), maximization of economic benefit. A safety system needs to provide reliability for the intended protective function, at the same time ensuring higher operational availability of the process itself.
Another important issue one should keep in mind that the safety data provided by manufacturers for their devices, with due validation by a third certifying authority ...
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