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Rosemount™ 8711 Magnetic Flowmeter Sensor: Comprehensive Technical Overview
1. Product Overview
The Rosemount™ 8711 Magnetic Flowmeter Sensor is a flangeless, clamp-style sensor designed for precise and reliable measurement of conductive liquids across diverse industrial applications. As part of Emerson's Rosemount 8700 Series, it combines cost-effectiveness, compact design, and lightweight construction (up to 50% lighter than flange-style sensors) while maintaining the robustness required for harsh environments. Its core technology leverages Faraday's Law of Electromagnetic Induction, generating a voltage proportional to fluid velocity when conductive fluids pass through a magnetic field
| Parameter | Specification |
| Accuracy | ±0.15% at 13:1 turndown; ±0.25% at 40:1 turndown |
| Line Sizes | 0.15-8 inches (4-200 mm) |
| Lining Materials | ETFE, PTFE, PFA |
| Electrode Materials | 316L SS, Hastelloy®, Platinum, Tantalum, Titanium |
| Pressure Rating | ASME B16.5 150-300; DIN PN 10-40 |
| Ingress Protection | IP68 (submersible with sealed cable glands) |
| Temperature Range | -29°C to +130°C (-20°F to +266°F) |
| Output Compatibility | HART, FOUNDATION™ Fieldbus |
3. Design Features & Advantages
Flangeless Clamp Design: Eliminates traditional flanges, reducing weight and installation costs by ~30% while enabling easy centering via alignment rings
Full-Welded Construction: Hermetically sealed housing prevents moisture/contaminant ingress, ensuring longevity in corrosive or wet conditions
Removable Terminal Block: Enables field repairs without process shutdowns, minimizing downtime
Obstruction-Free Flow Path: No moving parts, reducing maintenance and enabling measurement of slurries, pulp, and corrosive fluids
Advanced Diagnostics: E-Series compatibility provides real-time alerts for electrode coating, empty pipes, or signal degradation
4. Application Scenarios
Corrosive Liquids: Chemical processing (e.g., sulfuric acid) using Tantalum electrodes and PTFE linings
Slurries & Abrasives: Mining tailings, pulp/paper stock with wear-resistant polyurethane linings.
Sanitary Applications: Food/beverage (e.g., dairy, juices) with PFA linings and CIP compatibility
Water/Wastewater: Municipal plants measuring raw sewage with 316L SS electrodes.
5. Installation & Maintenance
Mounting: Direct clamping between ANSI/DIN flanges using alignment rings for pipe centering. Requires 5x upstream and 3x downstream straight-pipe runs
Electrical Safety: Grounding rings mandatory for non-conductive pipes (e.g., PVC) to avoid signal noise.
Calibration: NIST-traceable verification via HART communicators or AMS Suite diagnostics
Troubleshooting: Electrode cleaning cycles (auto/manual) combat fouling; empty-pipe detection halts false readings.
6. Compatibility & Integration
Transmitters: Fully compatible with Rosemount 8700 Series transmitters (e.g., 8712D/H, 8732C, 8742C)
Control Systems: Integrates with DeltaV™, PlantWeb™ via FOUNDATION Fieldbus or 4-20mA HART protocols
Legacy Upgrades: Replaces older sensors (e.g., 8712C) without pipe modifications
7. Performance Validation
Flow Range: 0.01-30 ft/s (0.003-10 m/s), covering low-flow dosing to high-velocity discharges
Noise Immunity: Advanced signal processing filters out electrical interference in high-noise plants.
Long-Term Stability: ±0.1% annual drift due to solid-state design and absence of mechanical wear.
8. Industry Certifications
Safety: ATEX, IECEx, FM, CSA for hazardous areas (Class I Div. 1/2)
Sanitary: 3-A, EHEDG compliance for food/pharma
Environmental: NAMUR NE21 for EMC robustness
9. Limitations
Non-Conductive Fluids: Cannot measure hydrocarbons, gases, or deionized water (conductivity <5 µS/cm).
Temperature Limits: PFA linings degrade above 130°C; high-temperature versions require custom options
10. Conclusion
The Rosemount 8711 sets a benchmark for clamp-style magnetic flow sensors, delivering laboratory-grade accuracy in industrial settings. Its fusion of modularity, diagnostic intelligence, and material versatility makes it ideal for retrofit or new installations seeking reduced TCO. Emerson's 18-month warranty and global technical support further underscore its reliability
Company Advantages of KeRui (WeiFang) Automation Equipment Co., Ltd.
KeRui (WeiFang) Automation Equipment Co., Ltd. is a leading manufacturer and innovator in industrial automation solutions, specializing in pressure transmitters, flowmeters, handheld communicators, valve positioners, and related instrumentation. With decades of expertise and a global reputation for quality, we are committed to delivering cutting-edge products tailored to meet diverse industrial demands. Below are our core competitive advantages:
1. Advanced Technology & Precision Engineering
High-Accuracy Pressure Transmitters: Our pressure transmitters achieve ±0.075% reference accuracy (digital) and ±0.1% (analog), ensuring reliable measurements even in extreme conditions (-40°C to 150°C). Leveraging 18-bit ADC technology, they minimize environmental temperature drift for long-term stability. Smart Flowmeters: Our variable area flowmeters (e.g., ZYZZ series) feature geomagnetic compensation, LCDs, and Exd II CT6 explosion-proof certification, suitable for hazardous environments like oil & gas and chemical plants.Valve Positioners with Auto-Calibration: Equipped with Foundation Fieldbus protocol compatibility, our valve positioners enable automatic zero/span adjustment and reduce commissioning time by 50%, ensuring optimal control loop performance
2. Robust Quality Control & Certifications
ISO 9001 & API Compliance: Adhering to ISO 9001:2015 and API standards, we implement rigorous quality checks from raw material selection to final testing. Durable Construction: Products feature 316L stainless steel, PTFE/PFA coatings, and IP67/IP68 protection, ensuring corrosion resistance and longevity in harsh environments. Global Certifications: Our devices meet ATEX/IECEx, SIL 2/3, and NAMUR NE 21/43 standards, making them compatible with international safety and regulatory requirements
3. Customization & Versatility
Tailored Solutions: We offer custom sensor matching (e.g., RTD, thermocouple) and output signal customization (4-20mA, HART, PROFIBUS) to align with specific application needs Wide Application Coverage: Products are designed for industries including oil & gas, water treatment, chemical processing, and HVAC systems, with flowmeters supporting flow rates from 20Nm³/h to 5000Nm³/h Multi-Function Handheld Communators: Our handheld devices provide intuitive configuration, real-time diagnostics, and PID control integration, streamlining field operations.
4. Innovation & R&D Excellence
In-House R&D Team: With 6+ dedicated engineers, we continuously innovate in materials (e.g., H-alloy sensors) and software (e.g., predictive maintenance algorithms).Smart Features: Products integrate self-diagnostic alerts (e.g., sensor drift detection) and IoT readiness, enabling seamless integration into Industry 4.0 systems.
5. Efficient Production & Global Service
Large-Scale Manufacturing: Operating 7 production bases with 5,000+ annual capacity, we ensure fast delivery and cost-effectiveness Comprehensive Support: Our 51% localized overseas teams provide 24/7 technical assistance, onsite training, and spare parts supply Warranty & Traceability: All products come with a 1-year warranty and full lifecycle traceability, backed by digital documentation for easy maintenance.
6. Sustainable & User-Centric Design
Energy Efficiency: Devices like low-power flowmeters (3.6V lithium battery option) reduce operational costs
Ergonomic Interfaces: Features like dual-indication displays (LCD + analog) and WAGO spring-clamp terminals simplify installation and reduce downtime.
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