What is a safety instrumented system (SIS)?

A safety instrumented system (SIS) is specifically designed to enhance safety by preventing accidents through automation. Its primary function is to monitor safety-critical processes and take action to mitigate hazards when necessary. This can involve automatically shutting down equipment, isolating a dangerous process, or activating emergency protocols to protect personnel, the environment, and assets. The emphasis on automation means that the SIS operates without the need for human intervention in critical scenarios, which is crucial for maintaining safety in potentially hazardous environments.

The design and implementation of a SIS are guided by industry standards that help manage safety risks effectively. By automating responses to safety concerns, the SIS significantly reduces the likelihood of human error, which is one of the common causes of accidents in industrial settings.