Safety instrumented systems perform a critical role in providing safer, more reliable process operations. It is important to consider the entire safety instrumented function (SIF) as a complete entity - sensor, logic solver and final element - because most faults in SIS applications occur in the field. As a smart solution, the DeltaV SIS™ system continuously monitors the ability of sensors, logic solvers and final elements to perform on demand while diagnosing faults before they cause spurious trips. Digital HART communications enables this smart approach, which increases process availability and reduces lifecycle costs.
Bulky logic solvers and multiplexers can now be replaced with state-of-the-art logic solvers that support digital communications to continuously monitor the health of the entire SIF. The DeltaV SIS logic solver, built for digital communications with safety sensors and final elements, uses the power of predictive field intelligence to increase the overall reliability of the entire SIF. Providing intelligent device diagnostic information allows staff to respond quickly and prevent unexpected downtime. The DeltaV SIS smart logic solver is TÜV-certified without exception for use in SIL 1-3 safety applications as defined by IEC 61508.
Take the first step toward reducing undetected failures by replacing switches with transmitters. Smart transmitters have far fewer dangerous undetected failures than switches. Smart sensors, such as Emerson's Rosemount™ and Micro Motion™ devices, go beyond detecting component failures. They evaluate the performance of the complete measurement system, extending diagnostics to detect formerly undetectable dangerous failures outside the physical bounds of the transmitter-providing both transmitter and process diagnostics. The end result is greater credit for failure-on-demand calculations, easier compliance with IEC 61511 guidelines, higher safe failure fractions, less redundancy, less proof testing and longer intervals between proof tests.
Digital valve controllers, such as the FIELDVUE™ instrument, provide automated performance monitoring and testing by enabling partial stroke testing while the safety valve is online. Automated partial stroke testing of valves can improve safety integrity, reduce the number of risky personnel trips into the field, and extend the time between mandatory proof tests. The result is increased confidence that the valve will perform on demand while reducing costs. With no additional wiring required, partial stroke tests can be automatically initiated by the DeltaV SIS logic solver or manually initiated from standard operator faceplates and test results are automatically recorded for easy documentation.
