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12/2/2010

Vibrating Fork Level Switch for Safety Instrumented Systems

Emerson Process Management's Rosemount 2130 vibrating fork level switches are designed for (Safety Integrity Level) SIL 2 safety instrumented systems. The switches feature built-in fault monitoring/self-checking diagnostics and is a good fit for high- and low-level alarms. Following successful third-party evaluation by  Exida, the switch has the required Failure Modes, Effects and Diagnostic Analysis (FMEDA) report. As a result, companies in the oil & gas production, refining, petrochemical, chemical and power industries can benefit from low-maintenance vibration fork technology while ensuring compliance with associated IEC industry standards. With several output types with a Safe Failure Fraction (SFF) over 90%, the resulting FMEDA report shows SIL 2 suitability. As per IEC 61508 and IEC 61511 the documentation provides safety instrumentation engineers with the required failure data and with proof test recommendations. With a five-year-plus proof test interval, the proof test can be coordinated with plant turnaround, minimizing process interruption and reducing risk to personnel. The switch is designed for use in extreme temperatures ranging from -70 C to + 260 C (-94 F to +500 F) and is available with 316L stainless steel as standard, ECTFE/PFA copolymer-coated 316L stainless steel or corrosion-resistant alloy C wet side, as well as a choice of electronic output types and aluminium or stainless steel housing options.

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