Level Measurement Safety Systems in Flare Knockout Drums
Reliable level measurement in safety recovery systems with guided wave radar and level switch technology
Achieve Required Safety Integrity Level and Reduce Risk
Flare (knockout) drums are a primary component of the safety recovery system. During the pressure-relief process, the drum will rapidly go from empty to full, and the level measurement must be rapid as well as robust and dependable. This application is safety critical and thus requires level measurement devices with the highest possible safety integrity level.
The Rosemount 5408 level Transmitter and Rosemount 2140 Level Detector are both safety certified by a third party to SIL2 (IEC61508) With class-leading low dangerous undetected failure rates they provide highly reliable level measurement and overfill prevention, reducing risk in safety instrumented systems.
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Product Solutions
The Rosemount™ 5408 Non-Contacting Radar Level Transmitter uses enhanced technology and Human Centered Design to deliver accurate, reliable measurements on both liquid and solid materials. Using two-wire FMCW technology the Rosemount 5408 deploys a continuous echo to maximize radar signal strength and produce a more robust and reliable measurement. Delivering ease-of-use at every touch point, the Rosemount 5408 uses an intuitive software interface to guide the operator through installation, commissioning, proof-testing and maintenance. Powerful onboard diagnostics suite proactively monitors transmitter health and alerts if there is an issue. Safety certified to IEC 61508 for SIL 2 applications, the Rosemount 5408:SIS reduces cost of risk, increases efficiency and protects people and the environment.
- Low 12V dc lift-off voltage
- Immune to intermittent power loss
- Unique PTFE seal design eliminates the need for o-rings
Accuracy
Standard: ± 0.08 in. (± 2 mm)
Ultra accuracy: ± 0.04in. (± 1mm)
Ultra accuracy: ± 0.04in. (± 1mm)
Measurement Range
492 ft (150m), 82 ft (25 m) for Rosemount 5408:SIS in Safety mode
Operating Pressure
-15 to 1450 psi (-1 to 100 bar)
The new Rosemount™ 2140 is the world's first wired HART® vibrating fork level detector for applications including overfill prevention, high and low level alarms, and pump protection. Providing reliable level detection of all liquids as well as sediments, the Rosemount 2140 offers greater ease-of-use and flexibility with smart diagnostics that continuously monitor electronic and mechanical device health, and a fully integrated remote proof-testing capability, helping to increase safety and efficiency of both plant and workers. The Rosemount 2140:SIS is certified to IEC 61508 (SIL 2) for safety-critical applications.
- World's only wired HART vibrating fork level detector.
- Dry/wet switching optimized for many media types. Includes wet sand settings for managing tank and separator efficiency.
- Dry/wet switching reliability is maximized even when the media properties are unknown. Especially important in small tanks and pipes where levels may rapidly change.
Operating Pressure
Full vacuum to 1450 psig at 122 °F psi (100 barg at 50 °C)
Operating Temperature
-40 to 302 °F (-40 to 150 °C) as standard. -94 to 500 °F (-70 to 260 °C) as option
Certifications/Approvals
ATEX, IECEx, USA, Canadian, see full specs for complete list of certifications
