Emerson Rosemount 2051CFC Flow Meter
| Model：2051CFCDCS040N0B0032ABIQ4M5V5 Manufacturer: ROSEMOUNT Size: 40*80*25CM Detail Specification: Annubar Flow Meter Comment:Carton Shipping Weight: 20Kg Estimated Lead Time: 12 Weeks Payment：T/T HS CODE：9026809000
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product details
Emerson Rosemount 2051CFC Flow Meter
Introduction
The Rosemount™ 2051CFC Compact Annubar™ Flow Meter represents a significant advancement in differential pressure flow measurement technology, combining the field-proven Emerson Rosemount 2051C pressure transmitter platform with a compact averaging pitot tube design. This integrated solution is engineered for line sizes up to 12 inches (300 mm) and performs reliably across liquid, gas, and steam applications under demanding process conditions.-4
Factory leak-tested and calibrated as a complete assembly, the Rosemount 2051CFC Compact Annubar Flow Meter reduces potential leak points while simplifying installation. The patented T-shaped sensor features a flat upstream surface that creates a fixed separation point, enabling high performance across a wide flow range while positioning the stagnation zone to reduce noise and prevent particulate clogging.
Key Technical Specifications
Performance Specifications
| Parameter | Value |
| Flow Reference Accuracy | ±1.80% of flow rate at 8:1 flow turndown (Ranges 2-3) |
| Rangedown (Transmitter) | Up to 150:1 |
| Flow Turndown | 8:1 |
| Long-Term Stability | ±0.125% of URL for 5 years (±50 °F temperature changes, up to 1000 psi line pressure) |
| Response Time | 100 milliseconds |
| Measurement Range | Up to 1000 inH₂O (2.48 bar) differential |
The reference manual indicates that Range 1 flowmeters may experience an additional uncertainty up to 0.9%; consult Emerson documentation for exact specifications when operating at Range 1 conditions.-1
Functional Specifications
| Parameter | Value |
| Line Size Compatibility | 2 to 8 in. (50 to 200 mm) |
| Process Wetted Materials | 316 SST, 316L SST |
| Communication Protocols | 4-20 mA HART®, WirelessHART®, FOUNDATION™ Fieldbus, PROFIBUS® PA, 1-5 V Low Power HART® |
| Output Options | Differential pressure, scaled variable |
| Fluid Types | Liquid, gas, steam |
| Primary Element Options | Annubar averaging pitot tube (Option A), Conditioning orifice plate (Option C) |
Electrical and Power Specifications
For 4-20 mA HART output (output code A), the Rosemount 2051CFC operates on an external power supply of 10.5 to 55 Vdc with no load. Communication requires a minimum loop resistance of 250 Ω. Maximum loop resistance follows the formula: Max. Loop Resistance = 43.5 × (Power Supply Voltage – 10.5) .-1
For FOUNDATION Fieldbus (output code F) and PROFIBUS PA (output code W) configurations, transmitters operate on 9.0 to 32.0 Vdc terminal voltage with a current draw of 17.5 mA for all configurations including the LCD display option.-1
Wireless Specifications (WirelessHART®)
| Parameter | Value |
| Wireless Update Rate | 1 sec. to 60 min., user selectable |
| Power Module Life | Up to 10-year life, field replaceable (ordered separately) |
| Wireless Range (Internal Antenna) | 225 m |
| Data Reliability | >99% |
Certifications and Approvals
SIL 2/3 certified to IEC 61508 by independent third party
NACE® MR0175/ISO 15156 and MR0103 materials conformance
Hazardous location approvals (multiple classifications including Explosion-proof, Flameproof, Intrinsically Safe)
Pressure rating up to ANSI 600# (PN 100)
Warranty
Up to 5-year limited warranty
Rosemount 2051CFC Model Number Breakdown and Ordering Information
The Rosemount 2051CFC Compact Annubar Flow Meter utilizes a comprehensive model code system for precise configuration. Below is a detailed breakdown with complete model number examples.
Model Code Structure
2051CFC — Compact Annubar Flow Meter
Typical model number: 2051CFCDC S 060 N 065 0 3 2 A A 1 WC E5 M5 -44
This model number decodes as follows:
2051CFC — Base model: Compact Annubar Flow Meter
D — Measurement type: Differential Pressure
C — Fluid type / configuration variant
S — Primary element type
060 — Line size: 6 inches (150 mm)
N — Material code
065 — Additional specification
0 3 2 — Sensor and range configuration
A A 1 — Output and housing options
WC — Communication protocol
E5 M5 — Approvals and display options
Complete Model Number Examples
2051CFCDC8040N065072A — Compact orifice flow meter configuration with 4-inch line size and HART output-51
2051CFCDCS060N065032AA1WCE5M5 — Differential pressure, 6-inch line size, Annubar primary element, HART output, aluminum housing
2051CFCACL040 — Annubar configuration, 4-inch line size, liquid service
2051CFCACS060 — Annubar configuration, 6-inch line size, steam service
2051CFCACG080 — Annubar configuration, 8-inch line size, gas service
2051CFCCCL050 — Conditioning orifice configuration, 5-inch line size, liquid service
2051CFCACS020 — Annubar configuration, 2-inch line size, steam service
2051CFCCCG100 — Conditioning orifice configuration, 10-inch line size, gas service
2051CFCACL120 — Annubar configuration, 12-inch line size, liquid service
2051CFCACS040 — Annubar configuration, 4-inch line size, steam service
2051CFCCCL080 — Conditioning orifice configuration, 8-inch line size, liquid service
2051CFCACG060 — Annubar configuration, 6-inch line size, gas service
2051CFCCCG040 — Conditioning orifice configuration, 4-inch line size, gas service
2051CFCACL100 — Annubar configuration, 10-inch line size, liquid service
2051CFCACS120 — Annubar configuration, 12-inch line size, steam service
2051CFCCCL020 — Conditioning orifice configuration, 2-inch line size, liquid service
Ordering Code Reference
| Parameter | Options |
| Measurement Type | D (Differential Pressure) |
| Fluid Type | L (Liquid), G (Gas), S (Steam) |
| Line Size | 020 through 120 (2 to 12 inches) |
| Primary Element Technology | A (Annubar), C (Conditioning Orifice), P (Standard Orifice) |
| Sensor Size | Determined by line size |
| Transmitter Connection | Direct mount |
| Differential Pressure Range | Range 1, 2, or 3 |
| Output Protocol | 4-20 mA HART, WirelessHART, FOUNDATION Fieldbus, PROFIBUS PA, 1-5 V Low Power HART |
| Housing Material | Aluminum, SST |
| Conduit Entry Size | 1/2-14 NPT, M20 |
| Display Options | LCD, graphical back-lit |
| Configuration Buttons | Option code D4 (Analog zero and span), DZ (Analog zero and span), or M4 (Local Operator Interface) |
| Diagnostics | Basic, Loop Integrity, Plugged Impulse Line |
For 10-inch and 12-inch line sizes, an alignment ring must be ordered separately as an installation accessory.-44
Key Features and Technical Advantages
Compact Annubar Sensor Design
The Rosemount 2051CFC incorporates the same patented T-shaped averaging pitot tube technology found in larger Annubar systems. The flat upstream surface creates a fixed separation point, while the stagnation zone reduces flow-induced noise, minimizes measurement inaccuracies, and prevents particulate accumulation. The sensor maintains a small profile in the pipe for reduced permanent pressure loss and lower energy consumption.-32-52
Factory-Integrated Assembly
Complete flow assemblies arrive leak-tested and calibrated, reducing potential leak points by up to 70% compared to field-assembled alternatives. The design mounts directly between existing raised-face flanges, eliminating the need for fittings, impulse tubing, valves, adapters, and manifolds.-11-4
Advanced Diagnostic Capabilities
The Rosemount 2051CFC includes multiple diagnostic functions:
Loop Integrity Diagnostics — Proactively detects degraded electrical loop integrity issues (option code DA0)
Plugged Impulse Line Diagnostics — Identifies impulse piping blockages before they impact process quality
Process Alerts — Monitors abnormal process conditions for increased safety
Power Advisory — Provides advanced electrical loop monitoring
Bluetooth® Wireless Connectivity
Select configurations feature Bluetooth wireless connectivity, enabling maintenance and configuration tasks without physical connection or separate configuration tools.-4
Graphical Back-Lit Display
The graphical, back-lit display supports eight different languages and remains readable in all lighting conditions. The Local Operator Interface (option code M4) offers straightforward menus and built-in configuration buttons for streamlined commissioning.-4-49
Multi-Protocol Communication Support
| Protocol | Availability |
| 4-20 mA HART® | Standard |
| WirelessHART® | Option |
| FOUNDATION™ Fieldbus | Option |
| PROFIBUS® PA | Option |
| 1-5 V Low Power HART® | Option |
Application-Specific Configuration
Application-specific configuration transforms the pressure transmitter into a flow meter with totalizer functionality, enabling real-time flow accumulation without external computation.
Installation Considerations
Line Size Compatibility
The Rosemount 2051CFC Compact Annubar Flow Meter is available for line sizes from 2 to 8 inches (50 to 200 mm) when configured with Annubar primary element technology.-5
For conditioning orifice plate configurations, line sizes range from 0.5 to 12 inches (15 to 300 mm).-12
Straight Pipe Requirements
When utilizing conditioning orifice plate technology, the Rosemount 2051CFC requires only two pipe diameters upstream from an upstream disturbance (double elbows, valves, reducers), delivering ±0.5% accuracy with the 405C Conditioning Compact Orifice.-11
For standard Annubar installations without conditioning orifice technology, consult factory recommendations for specific straight pipe requirements based on upstream piping configuration.
Mounting Between Existing Flanges
The Rosemount 2051CFC installs directly between any existing raised-face flanges. A self-centering ring ensures optimal accuracy while simplifying the installation process. The compact form factor requires no additional pipe penetrations beyond the flange mounting location.-11
Sensor Sizing
Proper sensor sizing is determined based on probe width relative to pipe diameter. For Annubar configurations, the Rosemount 2051CFC Compact Annubar Flow Meter is available with sensor sizes appropriate to the specified line size.
Applications
The Rosemount 2051CFC Compact Annubar Flow Meter is suitable for a wide range of industrial applications:
Oil and Gas Production — Wellhead flow measurement, separator monitoring
Refining — Process flow monitoring, utility distribution
Petrochemical — Chemical injection, reactor feed measurement
Power Generation — Boiler feedwater, steam flow, cooling water
Pulp and Paper — Process water, chemical dosing, steam distribution
Utilities — Compressed air, natural gas, steam metering
HVAC — Chilled water, hot water, air handling systems
Comparison: Rosemount 2051CFC vs. 2051CFA
| Feature | Rosemount 2051CFC | Rosemount 2051CFA |
| Line Size Range | 2 to 8 in. (Annubar); 0.5 to 12 in. (Orifice) | 2 to 96 in. |
| Primary Element | Compact Annubar / Conditioning Orifice | Full-size Annubar |
| Best Application | Small to medium lines, space-constrained installations | Large pipelines, utility applications |
| Installation | Between existing flanges | Multiple mounting configurations |
| Rangedown | Up to 150:1 (8:1 flow turndown) | Up to 150:1 (8:1 flow turndown) |
| Warranty | Up to 5-year limited | Up to 5-year limited |
Safety Certifications
The Rosemount 2051CFC Compact Annubar Flow Meter is SIL 2/3 certified to IEC 61508 by an independent third party. Prior-use certificates of FMEDA data are available for safety instrumented function (SIF) installations. Hazardous location approvals are available for multiple classifications including Explosion-proof, Flameproof, and Intrinsically Safe (I.S.) installations
Obtain relevant certificates and quotations for the product
