Emerson Process Management's Rosemount 5400 non-contact level transmitter is now certified for use in safety instrumented systems. To this end, it has undergone an in-depth Amdec study by the Swedish Technical Research Institute. The Amdec analysis (analysis of failure modes, their effects and criticality) established reliability data and the test intervals required to maintain the desired level of reliability. The Amdec report, for an SFF (failure fraction without loss of safety) greater than 80 %, enabled us to obtain a SIL1 safety level (according to IEC 61508) for a fault-tolerant model of 0. SIL2 can be obtained for a fault-tolerant model of 1 (i.e. redundant). The IEC61511 standard on safety instrumented systems authorizes the use of data based on field experience (Proven in Use), and in this case the 5400 sensor can claim a SIL2 level.
This two-wire radar sensor (4-20 mA) can now be used in safety systems for applications in hazardous processes, such as oil and gas production, refineries, chemical plants or power stations. Given that the reliability data was obtained with a relatively long test interval, it is possible to wait for scheduled plant shutdowns (for refurbishment or maintenance) to carry out these tests.
This radar sensor has been designed for safe operation, including surface condition monitoring and the use of dust- and condensation-resistant antennas. It also boasts an extended measurement range, and can work on liquids or solids with a relatively low dielectric constant.
Learn more: www2.emersonprocess.com/en-US/brands/rosemount/Safety-Products/Pages/index.aspx