3051SFA Air Flow Measurement Instrument – Annubar Differential Pressure Flow Meter for Gases

Typical Applications of Rosemount 3051SFA

1. Compressed Air Systems
   Ensures accurate monitoring of compressed air consumption in industrial plants, helping optimize energy efficiency and reduce operating costs.
2. HVAC and Ventilation
   Provides reliable measurement of airflow in large ducts and ventilation systems, supporting building automation and environmental control.
3. Power Generation
   Measures combustion air flow in boilers and turbines, improving efficiency and ensuring compliance with emission standards.
4. Petrochemical & Refining
   Monitors process air and gas flows in refining units, ensuring stable operations and safe process control.
5. Steel & Metallurgy
   Tracks blast furnace air supply and cooling gas flows, supporting consistent production quality and safety.
6. Food & Beverage
   Controls air flow in drying, fermentation, and packaging processes, maintaining product quality and process reliability.

Why It’s Effective

1. High turndown ratio (up to 200:1) → suitable for variable air demand.
2. Annubar technology → minimal pressure loss, ideal for large pipelines.
3. Multivariable output → delivers DP, SP, temperature, and compensated flow in one device.
4. Digital communication → integrates seamlessly with HART®, WirelessHART®, and FOUNDATION Fieldbus systems.

Frequently Asked Questions (FAQ)

Q1: What is the Rosemount 3051SFA?
A1: The Rosemount 3051SFA is an Annubar® differential pressure flow meter designed for accurate measurement of air and gas flow in industrial pipelines and duct systems.

Q2: How does the 3051SFA measure air flow?
A2: It uses the Annubar primary element to sense differential pressure across multiple ports, combined with a Rosemount pressure transmitter to calculate volumetric or mass flow.

Q3: What industries typically use the 3051SFA?
A3: Common applications include power generation (combustion air), HVAC and ventilation, compressed air monitoring, petrochemical refining, steel and metallurgy, and food & beverage processing.

Q4: What is the accuracy of the 3051SFA for air flow measurement?
A4: It provides up to ±0.75% of rate accuracy, with a turndown ratio of up to 200:1, making it suitable for variable air demand systems.

Q5: What pipe sizes can the 3051SFA handle?
A5: It supports a wide range of pipe diameters, from 2 inches (50 mm) up to 96 inches (2440 mm).

Q6: What communication protocols are available?
A6: The device supports 4–20 mA HART®, WirelessHART®, and FOUNDATION Fieldbus, ensuring seamless integration with modern control systems.

Q7: What are the key benefits compared to traditional orifice plates?
A7: The Annubar design minimizes permanent pressure loss, reduces installation costs, and provides multivariable measurement outputs (DP, SP, temperature, compensated flow).

Q8: Is the 3051SFA certified for safety-critical applications?
A8: Yes, it is SIL 2/3 compliant and meets IEC 61508 standards, making it suitable for safety instrumented systems.