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Emerson Process Management's Rosemount 5400 contactless level transmitter is now certified for use in instrumented security systems. To do this, it was submitted to an in-depth Amdec study by the Swedish technical research institute. The Amdec analysis (analysis of failure modes, effects and criticality) established reliability data and test intervals to maintain the desired level of reliability. The Amdec report, for an SFF (failure fraction without loss of safety) greater than 80%, provided an SIL1 level of safety (according to IEC 61508) for a model with a 0-fault tolerance. You can get the SIL2 level for a model with tolerance to the faults of 1 (so mounted in redundancy). The IEC61511 standard on instrumented security systems allows the use of data based on field experience feedback (Proven in Use) and in this case the 5400 sensor can qualify for a SIL2 level.
This two-wire radar sensor (4-20 mA) can now be used in safety systems for applications in hazardous processes, including oil and gas production, refineries, chemistry or power plants. Given that reliability data were obtained with a relatively long test interval, it is possible to wait for scheduled shutdowns of the facilities (for renovations or maintenance) to do these tests.
This radar sensor has been designed for safe operation, including monitoring of surface conditions and the use of antennas that are resistant to dust and condensation. It also has an extended measurement range and can work on liquids or solids with a relatively low dielectric constant.
Find out more: www2.emersonprocess.com/en-US/brands/rosemount/Safety-Products/Pages/index.aspx
