SIL-PAC Valve Automation Solution For Safety Systems
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A safety-instrumented system typically consists of a sensor to monitor the process, a logic device that compares process conditions to predetermined process limits, and a final control element that shuts down or vents the process should conditions reach a trip point.
Will the Final Control Element Work?
All SIS components must work on demand to ensure that the system operates as planned.
The operating integrity of the SIS most often depends upon its final control elements. These elements typically remain in one position until a demand is placed on them. This means they may be unable to perform their task when called upon due to lack of use.
If a final control element fails, the safety-instrumented system may not be able to take the process to the designed safe state.