Emerson Rosemount 3051CFA Flow Meter

Model：3051CFADCS020N065032AA1Q4M5

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

product details

Emerson Rosemount 3051CFA Flow Meter

Introduction

In industrial flow measurement applications where accuracy, reliability, and energy efficiency are paramount, the Rosemount™ 3051CFA Annubar™ Flow Meter stands as a market-leading integrated differential pressure flow solution. Combining the proven Emerson Rosemount 3051C pressure transmitter platform with advanced Annubar averaging pitot tube primary element technology, the Rosemount 3051CFA Annubar Flow Meter delivers dependable flow measurements across a wide spectrum of fluid applications, including liquid, gas, and steam service.

This comprehensive technical guide provides engineers, procurement specialists, and instrumentation professionals with detailed specifications, ordering information, and application insights for the Rosemount 3051CFA series—your complete resource for understanding why this flow meter remains the preferred choice for industrial facilities worldwide.

Product Overview

The Rosemount 3051CFA Annubar Flow Meter is a fully integrated differential pressure flow meter that arrives leak-tested and calibrated for out-of-the-box installation. Its patented T-shaped sensor design features a flat upstream surface that creates a fixed separation point, enabling high performance across an exceptionally wide flow range while positioning the stagnation zone to reduce noise and prevent particulate clogging.

Unlike traditional differential pressure flow solutions that require extensive straight pipe runs, the Rosemount 3051CFA reduces straight pipe requirements to just two diameters upstream and downstream from flow disturbances when equipped with conditioning orifice plate technology.

Key Technical Specifications

Performance Specifications

Parameter	Value
Flow Reference Accuracy (Ranges 2-3)	±1.80% of flow rate at 8:1 flow turndown
Rangedown (Transmitter)	Up to 150:1
Flow Turndown	8:1
Installed Stability	10-year
Measurement Range (Differential)	Up to 1000 inH₂O (2.48 bar)
Minimum Span — Range 1	0.5 inH₂O (1.2 mbar)
Minimum Span — Range 2	2.5 inH₂O (6.2 mbar)
Minimum Span — Range 3	10 inH₂O (24.9 mbar)

Functional Specifications

Parameter	Value
Line Size Compatibility	2 to 96 in. (50 to 2440 mm)
Process Wetted Materials	316L SST, Alloy C-276
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

Electrical and Power Specifications

For 4-20 mA HART output (output code A), the Rosemount 3051CFA 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 is determined by: Max. Loop Resistance = 43.5 × (Power Supply Voltage – 10.5) .

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 LCD display option.

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
Wireless Range (Internal Antenna)	225 m
Data Reliability	>99%

Certifications and Approvals

SIL 2/3 certified to IEC 61508 by independent third party

NACE® MR-0175 / ISO 15156 materials conformance

Hazardous location approvals (multiple classifications)

NSF certification for applicable configurations

Warranty

Up to 5-year limited warranty

Rosemount 3051CFA Model Number Breakdown and Ordering Information

The Rosemount 3051CFA Annubar Flow Meter utilizes a comprehensive model code system that allows precise configuration for specific application requirements. Below is a detailed breakdown of ordering information to assist in selecting the correct configuration.

Model Code Structure

3051CFA — Annubar Flow Meter

Complete Model Number Example

3051CFADG060CCHPS2T100031AA1RLI5M5Q4

This complete model number illustrates a typical fully configured Rosemount 3051CFA Annubar Flow Meter. Let us examine each segment:

3051CFA — Base model: Annubar Flow Meter

D — Measurement type: Differential Pressure

G — Fluid type: Gas

060 — Line size: 6-inch (150 mm)

CCHPS2 — Sensor configuration details

T100031 — Additional specifications

AA1RLI5M5Q4 — Output, housing, and options configuration

Ordering Code Elements

Code Position	Description	Example Options
3051CFA	Base Model	Annubar Flow Meter
Measurement Type	D	Differential Pressure
Fluid Type	L / G / S	Liquid / Gas / Steam
Line Size (2 digits)	020 to 960	020 (2-in./50mm) to 960 (96-in./2440mm)

Available Line Sizes (Partial List)

Line Size Code	Nominal Size
020	2 in. (50 mm)
025	2.5 in. (63.5 mm)
030	3 in. (80 mm)
035	3.5 in. (89 mm)
040	4 in. (100 mm)
050	5 in. (125 mm)
060	6 in. (150 mm)
070	7 in. (175 mm)
080	8 in. (200 mm)
100	10 in. (250 mm)
120	12 in. (300 mm)
140	14 in. (350 mm)
160	16 in. (400 mm)
180	18 in. (450 mm)

Optional Configuration Examples

3051CFADL020 — Differential pressure, liquid service, 2-inch line size
3051CFADS060 — Differential pressure, steam service, 6-inch line size
3051CFADG100 — Differential pressure, gas service, 10-inch line size
3051CFADG040 — Differential pressure, gas service, 4-inch line size
3051CFADL120 — Differential pressure, liquid service, 12-inch line size
3051CFADS080 — Differential pressure, steam service, 8-inch line size
3051CFADG160 — Differential pressure, gas service, 16-inch line size
3051CFADL020 — Differential pressure, liquid service, 2-inch line size with standard configuration

For steam applications requiring high-temperature capability, configurations paired with the 585 Annubar primary element can accommodate process temperatures up to 1500 °F (815 °C) and maximum operating pressures per ANSI B16.5 2500#.

Key Features and Technical Advantages

Patented T-Shape Annubar Sensor Design

The Rosemount 3051CFA Annubar Flow Meter incorporates a patented T-shaped averaging pitot tube that delivers superior measurement accuracy over a wide flow range. The flat upstream surface creates a fixed separation point, while the strategically positioned stagnation zone serves multiple critical functions:

Reduces flow-induced noise

Minimizes measurement inaccuracies

Prevents particulate accumulation and sensor clogging

Energy-Efficient Operation

The T-shaped design ensures very low permanent pressure loss compared to traditional primary elements such as orifice plates or Venturi tubes. This characteristic directly translates to reduced pumping or compression energy requirements, lowering operational costs over the life of the installation.

Integrated Assembly for Simplified Installation

Complete flow assemblies arrive leak-tested and calibrated from the factory, reducing potential leak points by up to 70% compared to field-assembled alternatives. This pre-assembled design simplifies installation and commissioning while improving long-term reliability.

Advanced Diagnostic Capabilities

The Rosemount 3051CFA Annubar Flow Meter includes multiple diagnostic functions:

Loop Integrity Diagnostics — Proactively detects degraded electrical loop integrity issues

Plugged Impulse Line Diagnostics — Identifies impulse piping blockages before they impact process quality

Process Alerts — Monitors abnormal process conditions for increased safety and reduced downtime

Bluetooth® Wireless Connectivity

Select configurations of the Rosemount 3051CFA Annubar Flow Meter feature Bluetooth® wireless connectivity, enabling maintenance and service tasks to be performed without physical connection or separate configuration tools.

Graphical Back-Lit Display

The graphical, back-lit display supports eight different languages and remains easily readable in all lighting conditions. Built-in configuration buttons (quick service buttons) streamline commissioning and field adjustments.

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 additional external computation.

Primary Element Options

While the Rosemount 3051CFA Annubar Flow Meter natively incorporates Annubar averaging pitot tube technology, the platform is compatible with multiple primary element types for application flexibility:

Primary Element Type	Best Application
Annubar Averaging Pitot Tube	General liquid, gas, steam flow — large line sizes
Compact Conditioning Orifice	Reduced straight pipe requirements
Integral Orifice Plate	Improved accuracy in small line sizes

The conditioning orifice plate technology integrated with the Rosemount 3051CFA reduces straight pipe requirements to two diameters upstream and downstream from flow disturbances, significantly easing installation constraints in congested piping layouts.

Comparison: Rosemount 3051CFA vs. 3051SFA

The Emerson Rosemount flow meter portfolio includes both the 3051CFA and the premium 3051SFA series. Key distinctions include:

Feature	Rosemount 3051CFA	Rosemount 3051SFA
Rangedown	Up to 150:1 (8:1 flow turndown)	Up to 200:1 (14:1 flow turndown)
Warranty	5-year limited	Up to 15-year limited
Performance Class	Standard	Ultra for Flow (±0.04% of reading)
MultiVariable Capability	Scaled variable	Full mass/volumetric/energy flow
Integrated Thermowell	No	Yes

For applications requiring fully compensated mass flow measurements with integrated temperature sensing, the 3051SFA series may be the appropriate choice. For general differential pressure flow measurement requiring proven reliability and cost-effectiveness, the Rosemount 3051CFA Annubar Flow Meter delivers industry-standard performance.

Installation Considerations

Straight Pipe Requirements

When utilizing conditioning orifice plate technology, the Rosemount 3051CFA requires only:

2 diameters upstream from flow disturbances

2 diameters downstream from flow disturbances

For standard Annubar installations without conditioning orifice technology, longer straight runs may be required. When longer straight runs are available, position the sensor such that 80% of the straight run is upstream and 20% downstream for optimal flow profile conditioning.

Sensor Sizing

Sensor size selection is determined based on probe width relative to pipe diameter. Proper sizing ensures optimal differential pressure signal generation across the expected flow range. For accurate flow measurement, provide the pipe internal diameter (ID) at time of purchase, measured preferably at 1× ID from the sensor penetration location (upstream or downstream).

Mounting Orientation

For steam applications, mount the Rosemount 3051CFA Annubar Flow Meter at 45 to 75 degrees above horizontal to allow condensate to drain efficiently back into the process pipe.

For remote transmitter mounting configurations (temperatures exceeding 250 °F / 121 °C at transmitter location), impulse piping connects the remote-mounted transmitter to the Annubar sensor, allowing service flow temperatures to decrease to a point where the transmitter electronics are no longer vulnerable.

Application Engineering Guidelines

Fluid Compatibility

The Rosemount 3051CFA Annubar Flow Meter is suitable for:

Clean and dirty liquids

Gases (including natural gas, air, and industrial gases)

Saturated and superheated steam

Corrosive fluids (with appropriate wetted materials: 316L SST or Alloy C-276)

Pressure and Temperature Limits

Parameter	Limit
Maximum Differential Pressure	1000 inH₂O (2.48 bar)
Process Temperature (standard)	Dependent on primary element selection
High-Temperature Option (with 585 Annubar)	Up to 1500 °F (815 °C)
Maximum Operating Pressure (with 585 Annubar)	ANSI B16.5 2500#

Turndown and Accuracy Considerations

At 8:1 flow turndown, the Rosemount 3051CFA Annubar Flow Meter achieves ±1.80% of flow rate accuracy for Ranges 2 and 3. Range 1 flow meters may experience additional uncertainty up to 0.9%—consult factory representatives for exact specifications when operating at Range 1 conditions.

The 150:1 transmitter rangedown capability combined with 8:1 flow turndown provides flexibility across widely varying process conditions while maintaining reliable measurements.

Model Number Configuration Reference

When ordering a Rosemount 3051CFA Annubar Flow Meter, the following configuration parameters must be specified:

Parameter	Options
Measurement Type	D (Differential Pressure)
Fluid Type	L (Liquid), G (Gas), S (Steam)
Line Size	020 through 960 (2 to 96 inches)
Sensor Size	1, 2, 3 (based on line size)
Annubar Type	Pak-lok, Flo-tap
Sensor Material	SST, Alloy C-276
Transmitter Connection	Direct mount, remote mount
Differential Pressure Range	Range 1, 2, or 3
Output Protocol	4-20 mA HART, WirelessHART, FOUNDATION Fieldbus, PROFIBUS PA
Housing Material	Aluminum, SST
Conduit Entry Size	1/2-14 NPT, M20
Display Options	LCD, graphical back-lit
Diagnostics	Basic, Loop Integrity, Plugged Impulse Line

Configuration Examples

3051CFADL020 — Liquid service, 2-inch line size, standard configuration

3051CFADS060 — Steam service, 6-inch line size, standard configuration

3051CFADG100 — Gas service, 10-inch line size, standard configuration

3051CFADG040 — Gas service, 4-inch line size, standard configuration

3051CFADL120 — Liquid service, 12-inch line size, standard configuration

3051CFADS080 — Steam service, 8-inch line size, standard configuration

3051CFADG160 — Gas service, 16-inch line size, standard configuration

3051CFADL020 — Liquid service, 2-inch line size, standard configuration

3051CFADG100AA1RLI5M5Q4 — Gas service, 10-inch line size with HART output, aluminum housing, and loop integrity diagnostics

3051CFADL060 — Liquid service, 6-inch line size, standard configuration

3051CFADS040 — Steam service, 4-inch line size, standard configuration

3051CFADG020 — Gas service, 2-inch line size, standard configuration

3051CFADL080 — Liquid service, 8-inch line size, standard configuration

3051CFADS120 — Steam service, 12-inch line size, standard configuration

3051CFADG060 — Gas service, 6-inch line size, standard configuration

3051CFADL040 — Liquid service, 4-inch line size, standard configuration

3051CFADS020 — Steam service, 2-inch line size, standard configuration

3051CFADG080 — Gas service, 8-inch line size, standard configuration

3051CFADL100 — Liquid service, 10-inch line size, standard configuration

3051CFADS160 — Steam service, 16-inch line size, standard configuration

Troubleshooting and Maintenance Guidelines

Common Issues and Solutions

Issue	Possible Cause	Recommended Action
Erratic output	Plugged impulse lines	Use Plugged Impulse Line diagnostics to detect blockages
No output	Loop power issue	Check supply voltage (10.5–55 Vdc for 4-20 mA HART)
Inaccurate flow reading	Sensor fouling	Inspect Annubar sensor; stagnation zone design minimizes clogging but periodic inspection recommended
Communication failure	Insufficient loop resistance	Ensure minimum 250 Ω resistance for HART communication

Diagnostic Tools

The Rosemount 3051CFA Annubar Flow Meter supports:

Loop Integrity Diagnostics — Detects electrical loop degradation

Plugged Impulse Line Diagnostics — Identifies impulse piping blockages

Process Alerts — Monitors for abnormal process conditions

Option Code DA0 enables Power Advisory functionality for proactive detection of degraded electrical loop integrity issues. Option Code M4 provides Local Operator Interface with straightforward menus and built-in configuration buttons.

Safety Certifications

The Rosemount 3051CFA 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.

Conclusion

The Rosemount 3051CFA Annubar Flow Meter represents a mature, field-proven solution for differential pressure flow measurement across liquid, gas, and steam applications. By integrating the Emerson Rosemount 3051C pressure transmitter platform with patented Annubar averaging pitot tube technology, this flow meter delivers reliable performance, energy-efficient operation, and simplified installation.

From 2-inch process lines to 96-inch utility pipelines, from clean liquids to high-temperature steam, the Rosemount 3051CFA Annubar Flow Meter offers the flexibility, accuracy, and durability that industrial facilities demand. Factory leak-tested and calibrated assemblies, advanced diagnostic capabilities, and multiple communication protocol options ensure that the Rosemount 3051CFA meets the requirements of modern process automation systems while reducing total cost of ownership.