Safety Instrumented System (SIS): Instrumented system used to implement one or more safety instrumented functions. An SIS is COMPOSED of any combination of sensors, logic solvers, and final elements. This can include safety instrumented control functions, safety instrumented protection functions, or both. In many INDUSTRIAL processes, especially those in the chemical or oil & gas industries, involve inherent risk due to the presence of dangerous chemicals or GASES. Safety Instrumented Systems are specifically designed to protect personnel, equipment, and the environment by reducing the likelihood or the impact severity of an identified emergency event.

Safety INTEGRITY Level (SIL): SIL is a quantifiable MEASUREMENT of risk used as a way to establish safety performance targets for SIS systems. IEC standards specify four possible Safety Integrity Levels (SIL1, SIL2, SIL3, SIL4); however, ISA S84.01 only recognizes up to SIL3 levels.

Safety Instrumented System (SIS): Instrumented system used to implement one or more safety instrumented functions. An SIS is composed of any combination of sensors, logic solvers, and final elements. This can include safety instrumented control functions, safety instrumented protection functions, or both. In many industrial processes, especially those in the chemical or oil & gas industries, involve inherent risk due to the presence of dangerous chemicals or gases. Safety Instrumented Systems are specifically designed to protect personnel, equipment, and the environment by reducing the likelihood or the impact severity of an identified emergency event.

Safety Integrity Level (SIL): SIL is a quantifiable measurement of risk used as a way to establish safety performance targets for SIS systems. IEC standards specify four possible Safety Integrity Levels (SIL1, SIL2, SIL3, SIL4); however, ISA S84.01 only recognizes up to SIL3 levels.