Safety Instrumented System (SIS) component selection is to be done to suit the plant safety requirements and must follow all the specifications as per the below International standards.
SIS components selection has to be done rigorously with experienced, qualified design Engineers under the supervision of Safety experts.
Components selected for use in an SIS must either be certified for use in SIS applications or selected based upon prior user experience. Of course, the components and the overall design must meet the requirements for the SIF as defined in Safety Requirements Specification.
Prior use is based on the installation of similar instruments under an identical environment in multiple facilities and the instruments are proved for use for several years.
Find below the pressure transmitter (Emerson) used in SIS approved with safety agency – Exida.
End users to select the SIS instruments with careful evaluation of certifications or the Prior use category of those instruments that are well proven in many plants.
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