The Rosemount 585 Annubar Primary Element for Severe Service is a precision-engineered differential pressure primary sensing element designed for accurate flow measurement in demanding process conditions. Manufactured with rugged construction and optimized sensing geometry, the Rosemount 585 Annubar provides reliable and repeatable flow measurement across a wide range of fluids, velocities, and operating environments, including corrosive, high-temperature, and high-pressure applications. The Annubar’s design minimizes flow disturbance, improves flow profile capture, and enhances measurement integrity for integration with compatible differential pressure transmitters.

Technical Specification for Rosemount 585 Annubar Primary Element 

Measurement Principle

• Differential pressure-based primary flow element employing averaging pitot (Annubar) sensing tubes
• Designed to produce differential pressure proportional to flow velocity

Sizes & Materials

• Available in multiple pipe sizes (typically from 1″ through 48″ and larger)
• Wetted materials include high-grade stainless steels (e.g., 316/316L), duplex/super duplex, Hastelloy, and other alloys selected for process compatibility
• Structural materials rated for severe service environments

Flow Ranges & Accuracy

• Applicable for liquids, gases, and steam
• High turndown capability (typically 10:1 or better depending on installation and Reynolds number)
• Typical measurement uncertainty per ISO/ASME standards for differential primary elements

Pressure & Temperature Limits

• Designed for high static pressures up to the applicable piping rating
• Suitable for elevated temperatures associated with process media, consistent with material selection and piping class

Connections & Mounting

• Flanged or Socket Weld/Threaded ends per ANSI/ASME or other international standards
• Support provisions and field installation hardware provided for reliable mounting

Certification & Compliance

• Engineered to industry standards for primary flow elements
• Suitable for use in many regulated industries with appropriate material traceability and documentation

Applications of Rosemount 585 Annubar Primary Element

The Rosemount 585 Annubar Primary Element for Severe Service is ideal for industrial flow measurement applications requiring durable, high-performance primary metering elements, including:

• Oil & Gas Processing: Measurement of hydrocarbon liquids and natural gas in crude, production, and pipeline systems
• Refinery & Petrochemical: Monitoring of fuel, feedstocks, and process streams in harsh conditions
• Chemical & Process Industries: Flow measurement in corrosive or erosive fluids with varying densities
• Power & Utilities: Steam and condensate flow measurement in boiler feed and plant distribution systems
• Water & Wastewater: Industrial and high solids fluid flow measurement requiring rugged construction
• General Severe Service Environments: Where high pressures, temperatures, or challenging fluid properties make conventional flow elements less reliable

The Annubar’s robust design and compatibility with differential pressure transmitters make it suitable for continuous monitoring and process control in automated systems.

Features for Rosemount 585 Annubar Primary Element for Severe Service

• Severe Service Design: Engineered for demanding conditions including high pressure, temperature, and corrosive or erosive media
• Averaging Sensing Tubes: Multi-point sensing captures representative differential pressure across the flow profile, improving accuracy over single-point devices
• High Accuracy and Repeatability: Optimized geometry for reliable flow measurement over broad operating ranges
• Wide Turndown Capability: Maintains measurement performance across varying flow rates
• Rugged Construction: Heavy-duty materials and fabrication suitable for industrial environments and long-term service life
• Flexible Material Options: Multiple corrosion-resistant alloys available to match process fluid compatibility
• Minimal Flow Disturbance: Designed to limit insertion loss and pressure drop while maintaining flow profile integrity
• Compatibility: Engineered for seamless integration with differential pressure transmitters and instrumentation systems
• Stability in Harsh Conditions: Withstands temperature cycling, vibration, and pressure fluctuations typical in severe service applications