Emerson Rosemount 3051CFP Flow Meter

Emerson Rosemount 3051CFP Flow Meter

Introduction

The Rosemount™ 3051CFP Integral Orifice Flow Meter combines the proven Emerson Rosemount 3051C pressure transmitter platform with a precision-engineered integral orifice primary element, delivering highly accurate flow measurement for small line size applications. This integrated assembly is specifically designed for line sizes from 0.5 to 1.5 inches (15 to 40 mm)—a segment where traditional flow measurement technologies often struggle due to installation error magnification and limited straight pipe availability-2.

Factory leak-tested and calibrated as a complete assembly, the Rosemount 3051CFP reduces potential leak points by up to 70% compared to field-assembled alternatives. The self-centering orifice plate design eliminates installation errors that are particularly problematic in small-bore piping, where even minor misalignments can produce significant measurement inaccuracies-6. Available with graphical back-lit display, Bluetooth® connectivity, flow-specific configuration, and multiple communication protocols including WirelessHART®, the Rosemount 3051CFP represents the industry-leading solution for small-line differential pressure flow measurement-1.

Key Technical Specifications

Performance Specifications

Functional Specifications

Electrical and Power Specifications

For 4-20 mA HART output (output code A), the Rosemount 3051CFP 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).

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-16.

Wireless Specifications (WirelessHART®)

Certifications and Approvals

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

NACE® MR0175 / ISO 15156 conformance-6

Hazardous location approvals (multiple classifications)

Prior-use certificate of FMEDA data for safety installations-2

Warranty

Up to 5-year limited warranty-2

Rosemount 3051CFP Model Number Breakdown and Ordering Information

The Rosemount 3051CFP utilizes a comprehensive model code system that allows precise configuration for specific application requirements. Each complete model number is built by concatenating option codes that define measurement type, line size, material construction, output protocol, housing type, display options, and additional features.

Model Code Structure

3051CFP — Integral Orifice Flow Meter

Complete Model Number Examples

3051CFPCK0P020N065033AA1RIA3N4M5P7Q4

3051CFPCK0P030N065033AA1RIA3N4M5P7Q4

3051CFPCK0P040N065033AA1RIA3N4M5P7Q4

3051CFPCK0P020N065033AA1RIA3N4M5P7Q8

3051CFPCK0P020N065033AA1RIA3N4M5P7Q8R7

3051CFPCL0P040N065033AA1RIA3N4M5Q4

3051CFPCL0P020N065033AA1RIA3N4M5

3051CFPCK0P030N065033AA1RIA3N4M5

3051CFPCK0P040N065033AA1RIA3N4M5Q4

3051CFPCK0P020N065033AA1RIA3N4M5

3051CFPCK0P040N065033AA1RIA3N4M5P7Q4R7

3051CFPCK0P030N065033AA1RIA3N4M5P7Q8

3051CFPCK0P020N065033AA1RIA3N4M5Q8

3051CFPCK0P040N065033AA1RIA3N4M5Q8

3051CFPCK0P030N065033AA1RIA3N4M5Q8

3051CFPCK0P020N065033AA1RIA3N4M5P7Q4R7

3051CFPCK0P020N065033AA1RIA3N4M5P7Q8R7 — WirelessHART® configuration with 2-inch line size, Alloy C-276 orifice plate, 316L SST body, advanced diagnostics, and SmartPower module

3051CFPCK0P040N065033AA1RIA3N4M5P7Q8 — WirelessHART® configuration with 4-inch line size, 316L SST orifice plate, 316L SST body, and SmartPower module

3051CFPCL0P020N065033AA1RIA3N4M5 — Wired HART configuration with 2-inch line size, Alloy 400 orifice plate, and standard diagnostics

3051CFPCK0P030N065033AA1RIA3N4M5 — Wired HART configuration with 3-inch line size, 316L SST orifice plate, 316L SST body

3051CFPCK0P040N065033AA1RIA3N4M5Q4 — Wired HART configuration with 4-inch line size, 316L SST orifice plate, 316L SST body, with loop integrity diagnostics

3051CFPCK0P020N065033AA1RIA3N4M5P7Q4 — FOUNDATION Fieldbus configuration with 2-inch line size, 316L SST orifice plate, advanced diagnostics

3051CFPCK0P030N065033AA1RIA3N4M5P7Q8 — PROFIBUS PA configuration with 3-inch line size, 316L SST orifice plate, SmartPower module

Ordering Code Reference Table

Key Features and Technical Advantages

Integral Orifice Design for Small Line Sizes

The Rosemount 3051CFP is engineered specifically for small bore flow measurement, where traditional orifice plate installations face unique challenges. The integral orifice plate is provided in a precision-honed meter run with a self-centering design that prevents installation errors—errors that are magnified in small pipelines and can significantly degrade measurement accuracy-. This design ensures consistent, repeatable performance across the entire operating range.

MultiVariable Capabilities

The Rosemount 3051CFP offers MultiVariable capabilities that enable real-time compensated mass and energy flow measurements. By integrating differential pressure, static pressure, and temperature measurements, the flow meter delivers fully compensated flow values without requiring separate external computation-6. This capability is particularly valuable in steam and natural gas applications where density compensation is essential for accurate energy accounting.

Complete Factory-Assembled Integration

Every Rosemount 3051CFP arrives as a complete, leak-tested, and calibrated assembly. The fully integrated design reduces potential leak points by up to 70% compared to field-assembled alternatives and eliminates the need for separate impulse piping, fittings, valves, adapters, and manifolds-1.

Bluetooth® Wireless Connectivity

Select configurations of the Rosemount 3051CFP feature Bluetooth wireless connectivity, enabling maintenance and configuration tasks without physical connection or separate configuration tools. This capability simplifies commissioning, reduces exposure to hazardous environments, and accelerates routine maintenance activities-1.

Graphical Back-Lit Display

The graphical, back-lit display supports eight different languages and remains easily readable in all lighting conditions. Built-in quick service buttons provide intuitive on-device configuration for streamlined commissioning and field adjustments-1.

Multi-Protocol Communication Support

Advanced Diagnostic Capabilities

The Rosemount 3051CFP includes multiple diagnostic functions that enhance process reliability and reduce unplanned downtime:

Loop Integrity Diagnostics — Proactively detects degraded electrical loop integrity issues, preventing measurement loss due to wiring problems-1

Plugged Impulse Line Diagnostics — Identifies impulse piping blockages before they impact process quality-1

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

Power Advisory — Provides advanced electrical loop monitoring for predictive maintenance planning-2

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. This feature simplifies system architecture and reduces overall installation costs-1.

Differential Pressure Flow Measurement Principle: How the Annubar Technology Works

The Rosemount 3051CFP is built upon the proven differential pressure measurement principle, utilizing averaging pitot tube technology similar to that employed in larger Annubar flow meters. A pitot tube or averaging pitot tube obtains the flow rate in a pipe or duct by measuring the velocity pressure over a cross-section of the process, averaging the result across multiple measurement ports-21.

As flow moves down the pipe, it encounters the front side of the T-shaped sensor bar, which creates high pressure above the pipe static pressure. This high pressure is captured by slots in the sensor. Simultaneously, low pressure—below the pipe static pressure—is created on the back side of the bar. The differential pressure transmitter reads these pressure values and converts the difference into a flow rate measurement-20.

The Annubar averaging pitot tube differs from a single-point pitot tube in that it takes multiple samples across the pipe cross-section. This approach averages the differential pressures encountered, accounting for natural variations in flow velocity across the section, delivering superior measurement accuracy over a wide flow range-22.

Key advantages of this technology include:

Minimal permanent pressure loss — The small profile of the sensor in the pipe reduces energy consumption for pumping or compression

Reduced straight pipe requirements — When combined with conditioning orifice plate technology, only two diameters upstream and downstream from flow disturbances are needed-6

Low susceptibility to clogging — The stagnation zone design prevents particulate accumulation in dirty service applications

Hot-tap installation capability — The primary element can be installed while the pipeline remains under pressure-21

Installation Considerations

Line Size Compatibility

The Rosemount 3051CFP Integral Orifice Flow Meter is available for line sizes from 0.5 to 1.5 inches (15 to 40 mm), making it the ideal choice for small-bore piping applications where larger flow measurement technologies are not feasible-2.

Straight Pipe Requirements

The self-centering integral orifice plate design, combined with precision-honed pipe sections, minimizes straight pipe requirements. When conditioning orifice plate technology is specified, the Rosemount 3051CFP requires only two pipe diameters upstream and two diameters downstream from flow disturbances, significantly easing installation in congestated piping layouts-6.

Mounting Between Existing Flanges

The Rosemount 3051CFP installs directly between any existing raised-face flanges. The self-centering orifice plate design ensures proper alignment without specialized tools or expertise. Gasket grooves are incorporated into the design to prevent installation errors that could compromise measurement accuracy-32.

Remote Transmitter Mounting

For high-temperature applications (exceeding 232 °C / 450 °F at the transmitter location), the Rosemount 3051CFP can be ordered with remote mounting configuration. Impulse piping connects the remote-mounted transmitter to the integral orifice primary element, allowing the process fluid to cool to temperatures within the transmitter‘s operating limits while maintaining measurement accuracy.

Sensor Sizing and Beta Ratio Selection

The orifice beta ratio (the ratio of orifice bore diameter to pipe internal diameter) is selected based on expected flow rate, fluid properties, and acceptable permanent pressure loss. Available beta ratios include 0.33, 0.45, 0.55, and 0.65. A smaller beta ratio generates higher differential pressure for low-flow applications but increases permanent pressure loss, while a larger beta ratio minimizes pressure drop but produces lower differential signal.

Applications

The Rosemount 3051CFP Integral Orifice Flow Meter is suitable for a wide range of industrial small-bore flow measurement applications:

Chemical Dosing and Injection — Precise measurement of chemical additives in petrochemical and water treatment processes

Natural Gas Distribution — Small line metering for residential, commercial, and industrial gas service

Compressed Air Systems — Monitoring compressed air consumption in manufacturing facilities

Steam Tracing — Measuring condensate and small steam flows in heat tracing systems

Pharmaceutical Manufacturing — Sanitary and high-purity fluid measurement in small-diameter tubing

Food and Beverage Processing — Ingredient dosing and utility flow monitoring

Hydraulic Systems — Monitoring return line and case drain flows

Pilot Plant Operations — Accurate flow measurement in research and development test loops

Comparison: Rosemount 3051CFP vs. 3051CFA vs. 3051CFC

Safety Certifications and Compliance

The Rosemount 3051CFP Integral Orifice Flow Meter is SIL 2/3 certified to IEC 61508 by an independent third party, making it suitable for use in safety instrumented functions (SIF) requiring up to SIL 3 capability. Prior-use certificates of FMEDA data are available to support safety integrity level verification-1.

NACE® MR0175 / ISO 15156 conformance is available for configurations with Alloy C-276 wetted materials, ensuring compatibility with sour service environments containing hydrogen sulfide (H₂S)-6.

Hazardous location approvals are available for multiple classifications including Explosion-proof, Flameproof, and Intrinsically Safe (I.S.) installations.

WirelessHART® Configuration Options

The Rosemount 3051CFP is available with WirelessHART® technology for applications where wiring is impractical or cost-prohibitive. Wireless features include:

IEC 62591 (WirelessHART®) Protocol — Secure, cost-effective wireless communication with >99% data reliability-1

SmartPower™ Module — Provides up to 10-year maintenance-free operation and field replacement without transmitter removal-1

Rapid Installation — Enables quick instrumentation of measurement points without the cost and complexity of wiring-1

User-Selectable Update Rate — Configurable from 1 second to 60 minutes, allowing optimization between battery life and data freshness-1

Troubleshooting and Maintenance

Common Issues and Recommended Actions

Diagnostic Tools Reference

Ordering Guidelines

When ordering a Rosemount 3051CFP Integral Orifice Flow Meter, the following parameters must be specified:

Conclusion