3051SFA In-Line Air Flow Meter – High Accuracy Differential Pressure Annubar for Industrial Gas Measurement
The Rosemount 3051SFA In-Line Air Flow Meter is a high-performance differential pressure Annubar solution designed for precise measurement of air, gas, and steam in industrial pipelines. Engineered with Emerson’s advanced sensing technology, it delivers exceptional accuracy, wide turndown capability, and reliable performance even in demanding environments. Its robust insertion-style Annubar design minimizes permanent pressure loss while providing direct in-line measurement, and durable stainless steel or alloy construction ensures long-term stability and corrosion resistance. With modern communication protocols such as HART®, WirelessHART®, and FOUNDATION Fieldbus, the 3051SFA integrates seamlessly into plant automation systems, making it ideal for applications in power generation, chemical processing, and municipal utilities where efficiency, safety, and compliance are critical.
Comparative Table – Rosemount In-Line Flow Meters
| Feature / Model |
Rosemount 3051SFA Annubar Flow Meter |
Rosemount 3051SF DP Flow Meter |
Rosemount 3051SFC Compact Orifice Flow Meter |
| Measurement Principle |
Differential Pressure via Annubar (multi-port averaging pitot tube) |
Differential Pressure with integrated primary element |
Differential Pressure via compact orifice plate |
| Installation Type |
In-line insertion (Annubar probe into pipe) |
In-line, full-bore bore or integrated assembly |
In-line, compact orifice plate assembly |
| Suitable Media |
Air, gas, steam, liquids |
Liquids, gases, steam |
Liquids, gases, steam |
| Pipe Size Range |
2–96 in (DN50–DN2400) |
Broad range depending on the primary element |
Typically, small to medium pipe sizes |
| Accuracy |
±0.75% of flow rate (with proper installation) |
±0.75% of flow rate |
±0.75% of flow rate |
| Turndown Ratio |
Up to 200:1 |
Up to 14:1 |
Up to 14:1 |
| Permanent Pressure Loss |
Very low (Annubar design minimizes blockage) |
Moderate |
Higher than Annubar (due to orifice restriction) |
| Materials |
316 SS, Alloy C-276, others |
Stainless steel options |
Stainless steel options |
| Output / Communication |
4–20 mA HART®, WirelessHART®, FOUNDATION Fieldbus |
4–20 mA HART®, Fieldbus |
4–20 mA HART®, Fieldbus |
| Best Application |
Large line sizes, air/gas/steam measurement, energy efficiency monitoring |
General-purpose DP flow measurement |
Compact installations, retrofit projects |
Typical Applications of Rosemount 3051SFA Pitot Tube Flow Meter
1. Power Generation
- Steam flow measurement in high-pressure and high-temperature pipelines
- Boiler efficiency monitoring with minimal permanent pressure loss
- Feedwater and auxiliary system flow tracking
2. Oil & Gas Industry
- Natural gas transmission and distribution in large-diameter pipelines
- Flare gas and fuel gas monitoring with reliable accuracy
- Crude oil and refined product flow measurement in midstream operations
3. Chemical & Petrochemical Plants
- Process steam and utility flow monitoring
- Large cooling water loop measurement with low maintenance requirements
- Compressed air and inert gas distribution networks
4. Water & Wastewater Treatment
- Raw water intake and distribution in municipal systems
- Effluent discharge monitoring for compliance
- Large-scale pumping station flow measurement
5. Industrial Manufacturing
- HVAC and building utility flow monitoring in large facilities
- Flow measurement in pulp & paper, steel, and cement industries
- Energy management systems require accurate steam and gas flow data
Frequently Asked Questions (FAQ)
Q1: What is the Rosemount 3051SFA In-Line Air Flow Meter used for?
A1: It is designed for accurate measurement of air, gas, and steam in industrial pipelines, using Annubar differential pressure technology.
Q2: How does the Annubar technology work?
A2: The Annubar probe measures differential pressure across multiple sensing ports, averages the flow profile, and calculates flow rate with high accuracy and minimal permanent pressure loss.
Q3: What industries typically use the 3051SFA?
A3: Power generation, chemical processing, oil and gas, municipal utilities, and HVAC/industrial facilities.
Q4: What pipe sizes can the 3051SFA handle?
A4: It is suitable for large line sizes, typically ranging from 2 inches (DN50) up to 96 inches (DN2400).
Q5: What communication protocols are supported?
A5: The meter supports HART®, WirelessHART®, and FOUNDATION Fieldbus for seamless integration into plant automation systems.
Q6: What is the accuracy of the 3051SFA?
A6: It provides flow measurement accuracy up to ±0.75% of flow rate, with a turndown ratio as high as 200:1.
Q7: Is the 3051SFA suitable for outdoor or harsh environments?
A7: Yes, it is built with durable materials such as 316 stainless steel and Alloy C-276, and is certified for hazardous locations with SIL safety ratings.
Q8: Can the 3051SFA measure liquids as well as gases?
A8: Yes, while it is optimized for air and gas, it can also measure liquid flow in industrial pipelines.
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