Emerson Rosemount 8711 Flow Meter Sensor

Emerson Rosemount 8711 Flow Meter Sensor

Introduction

The Rosemount 8711 Wafer Magnetic Flow Meter Sensor represents a significant advancement in electromagnetic flow measurement technology from Emerson. Designed with a flangeless wafer-style construction, the Rosemount 8711 delivers an economical, compact, and lightweight alternative to traditional flanged magnetic flowmeters, making it an ideal choice for applications where space is limited and cost efficiency is paramount-1.

Each Rosemount 8711 flow meter is supplied with alignment spacer kits that center the sensor precisely within the process piping, simplifying installation and eliminating the need for complex alignment procedures. The fully welded construction provides a hermetic seal that protects against moisture ingress and external contaminants, while the obstructionless design—featuring no moving parts—minimizes maintenance requirements and ensures long-term reliability-1.

For demanding industrial environments, the Rosemount 8711 offers exceptional measurement accuracy, achieving up to ±0.15% of volumetric flow rate across 13:1 flow turndowns and maintaining ±0.25% accuracy even across 40:1 turndown ranges. This precision is achieved through electromagnetic principles, where the sensor measures induced voltage across conductive flowing mediums, delivering consistent linearity and repeatability that remains stable over years of continuous operation-1.

Key Features and Benefits

The Rosemount 8711 incorporates several design innovations that set it apart from conventional flow measurement solutions:

Flangeless Wafer Construction – The compact wafer-style design minimizes both size and weight, significantly reducing material and installation costs compared to flanged alternatives. This makes the 8711 particularly well-suited for installations with limited straight-run pipe availability-1.

All-Welded Sensor Housing – The fully welded construction eliminates the need for gaskets and prevents moisture ingress, ensuring reliable operation even in harsh environmental conditions. The hermetically sealed design protects internal components from contaminants and extends the operational lifespan of the sensor-1.

Removable Terminal Block – A field-replaceable terminal block allows maintenance and repair to be performed without process shutdown, minimizing downtime and reducing total cost of ownership. This feature is particularly valuable in continuous processing applications where unscheduled interruptions can be costly-1.

Obstructionless Flow Path – With no moving parts and an unobstructed internal design, the Rosemount 8711 eliminates pressure drop concerns and reduces the need for routine maintenance. The smooth flow path also prevents material accumulation, making it ideal for measuring slurries and other challenging fluids-1.

Technical Specifications

Specifications are based on Rosemount 8711 documentation-1-3-9.

Complete Rosemount 8711 Model Part Number List

The Rosemount 8711 series is available in a comprehensive range of line sizes, each identified by a distinct part number. Below is the complete listing of standard Rosemount 8711 models with their corresponding specifications:

All models feature wafer-style connection and maintain consistent accuracy specifications of ±0.25% of flow rate. Optional electrode materials including Hastelloy and Platinum are available upon request for specialized applications. Pressure rating across all standard models is up to 16 bar (232 psi)-19.

For users requiring specific combinations of liner and electrode materials, the Rosemount 8711EMECSA1E configuration is available with ETFE liner and stainless steel electrodes, while the Rosemount 8711EPCCA1E1M5 offers enhanced chemical resistance for aggressive media applications. Custom configurations can be specified to meet unique process requirements.

Complete Rosemount 8711THA30FR1G1E504 Specifications

For high-temperature and high-pressure applications, the Rosemount 8711THA30FR1G1E504 variant delivers extended performance capabilities:

This variant is engineered with stainless steel construction, providing exceptional corrosion resistance and durability for demanding industrial environments. The expanded temperature range makes it suitable for both low-temperature and high-temperature processes, from cryogenic applications to steam and thermal fluid systems-10.

Liner and Electrode Material Selection Guide

The versatility of the Rosemount 8711 stems from its extensive material selection options, allowing users to match the sensor to virtually any conductive fluid application:

Liner Materials:

ETFE (Ethylene Tetrafluoroethylene) – Excellent chemical resistance for highly corrosive liquids, including strong acids and solvents. Temperature range suitable for most chemical processing applications.

PTFE (Polytetrafluoroethylene) – Superior non-stick properties and broad chemical compatibility, ideal for applications where material buildup is a concern. Commonly used in food, pharmaceutical, and general chemical service.

PFA (Perfluoroalkoxy) – Enhanced thermal stability and chemical resistance compared to PTFE, suitable for high-purity and ultra-corrosive applications.

Electrode Materials:

316L Stainless Steel – Standard material for general-purpose water and wastewater applications.

Nickel Alloy – Enhanced corrosion resistance for acidic and caustic environments.

Platinum – Exceptional chemical inertness for highly aggressive media and high-purity applications.

Tantalum – Superior resistance to a wide range of corrosive chemicals, including hydrochloric acid and chlorine compounds.

Titanium – Excellent corrosion resistance in oxidizing environments and seawater applications.

Additional material options are available; consult factory for specific requirements-1-3.

Installation Guidelines

Proper installation of the Rosemount 8711 is essential for achieving optimal measurement accuracy and long-term reliability. The following guidelines are recommended:

Positioning: For best results, install the flow meter in a horizontal pipe with the electrode plane aligned horizontally. Vertical pipe installation is acceptable provided the flow direction is upward, which ensures that the pipe remains full of fluid during operation. Install the sensor a minimum of five straight pipe diameters upstream and two pipe diameters downstream from the electrode plane to ensure fully developed flow conditions. The forward end of the flow arrow, indicated on the sensor identification tag, must point in the direction of flow through the sensor-35-.

Gasket Installation: Place appropriate gaskets between the wafer meter and the flanges on either side of the pipe. Gasket material must be compatible with the process fluid and operating temperature and pressure conditions. Proper gasket selection prevents leakage and ensures reliable sealing-35.

Alignment: Center the Rosemount 8711 precisely between the flanges so that the flow sensor is properly aligned with the pipe. The included alignment spacer kits facilitate accurate centering. Use alignment tools if necessary to ensure the sensor sits squarely between the flanges before tightening-35.

Bolt Tightening: Insert bolts through the flanges with equal spacing around the sensor. Tighten bolts in a cross-pattern to ensure even pressure distribution across the gasket sealing surfaces. Use a torque wrench to tighten bolts to the manufacturer’s recommended torque specifications-35.

Electrical Connection: Connect the sensor to a compatible transmitter—such as the Rosemount 8712 or 8732 transmitter—via the signal cable. Follow the wiring diagram provided in the installation manual. Ensure proper grounding and shielding of signal cables to avoid electromagnetic interference. Connect the power supply to the transmitter according to wiring guidelines (typically 24 VDC or 85–240 VAC). After installation, slowly pressurize the pipeline and check for leaks around gaskets and connections-35.

Post-Installation Verification: Verify flow direction matches the arrow on the sensor, as incorrect flow direction will produce inaccurate measurements. If required, perform calibration or zeroing on the transmitter to ensure accurate flow readings. Some transmitters require initial setup including entry of pipe diameter, flow units, and fluid properties. Use the transmitter’s diagnostics tools (HART or Modbus communication) to check for faults or installation issues such as air bubbles or empty pipe detection. Monitor flow readings on the transmitter to confirm proper operation-35.

Transmitter Compatibility

The Rosemount 8711 is designed for seamless integration with the full Rosemount 8700 Series transmitter lineup, providing users with flexible configuration options to suit specific application requirements. Compatible transmitters include:

Rosemount 8712E / 8712EM – Advanced transmitter with intuitive local operator interface, dedicated keys for ease of use, and comprehensive diagnostic suites including Smart Meter Verification, grounding and wiring fault detection, high process noise detection, and tunable empty pipe detection. Power supply options include 90–250 VAC (50–60 Hz) or 12–42 VDC. Enclosure rating: Type 4x, IP66-2.

Rosemount 8732C / 8732E – Integral mounting design with backlit display, suitable for space-constrained installations where remote mounting is not feasible.

Rosemount 8742C – Legacy transmitter platform for existing installations requiring backward compatibility.

Universal Capability – E-Series transmitters are compatible not only with all Rosemount-manufactured sensors (8705, 8711, 8721, 8707) but also with AC and DC powered sensors from other manufacturers, enabling reduced inventory and consistent operator interface across mixed instrument fleets-2.

Applications

The Rosemount 8711 is engineered for measuring the flow of electrically conductive liquids across a wide spectrum of industrial applications:

Water and Wastewater Treatment – Ideal for measuring raw water, treated water, effluent, sludge, and chemical dosing flows. The all-welded construction and wide material selection options ensure reliable performance in both municipal and industrial water treatment facilities-47.

Chemical Processing – Compatible with highly corrosive liquids including acids, bases, solvents, and other aggressive chemicals. The extensive selection of liner and electrode materials allows users to specify materials matched precisely to the chemical composition of the process fluid-1.

Pulp and Paper – Capable of measuring fibrous slurries and other challenging media that are often difficult to measure with conventional flow meters. The obstructionless design prevents fiber accumulation and maintains accuracy over extended periods.

Food and Beverage – Available with sanitary-compatible materials and configurations suitable for hygienic applications, including CIP/SIP service with process temperatures up to 140°C (284°F)-.

Pharmaceutical – High-purity applications benefit from the smooth flow path, absence of moving parts, and availability of inert wetted materials that meet stringent regulatory requirements.

Mining and Mineral Processing – Robust construction withstands abrasive slurries and harsh operating conditions common in mineral processing and ore beneficiation applications.

HVAC and District Energy – Compact wafer design fits easily into mechanical rooms and pipe chases where space is at a premium, providing accurate measurement of chilled water, hot water, and glycol solutions.

Safety and Hazardous Area Approvals

For installations in potentially explosive atmospheres, Rosemount provides certified configurations of the 8711 sensor and compatible transmitters. Key certification standards include:

FM Explosionproof and Dust-Ignitionproof – Approved for use in Class I, Division 1 hazardous locations as defined by FM Approvals standards.

CSA Explosionproof and Dust-Ignitionproof – Certified for Canadian hazardous location requirements under CAN/CSA C22.2 standards.

ATEX – European Union certification for equipment used in explosive atmospheres, mandatory for compliance within EU member states.

IECEx – Internationally recognized certification for hazardous area equipment, generally requiring third-party verification.

These certifications ensure safe operation in environments where flammable gases, vapors, or combustible dusts may be present. Users must verify that the operating environment is consistent with the appropriate hazardous locations certifications for their specific installation-.

Ordering Information

When configuring a Rosemount 8711 for your application, specify the following parameters:

Model number – Select from the standard Rosemount 8711 part number list (e.g., 8711005, 8711010, 8711020, 8711030, 8711040, 8711060, 8711080) or specify custom configuration.

Line size – Nominal pipe diameter (0.5 to 8 inches).

Liner material – ETFE, PTFE, or PFA.

Electrode material – 316L SS, Nickel Alloy, Platinum, Tantalum, or Titanium.

Flange rating – ASME B16.5 Class 150–300 or DIN PN 10–40.

Transmitter selection – Rosemount 8712E, 8732E, or legacy transmitter model.

Hazardous area certification – FM, CSA, ATEX, IECEx as required.

Mounting configuration – Integral or remote mount.

Contact the factory for additional material options, custom configurations, or application-specific engineering support.