Non-Contact Level Measurement Solution – Endress+Hauser FMU671 | Nivosonic Series
The Endress+Hauser FMU671 Nivosonic is a high-performance ultrasonic level sensor engineered for reliable, non-contact continuous level measurement of liquids and bulk solids. Trusted by process engineers across water treatment, chemical processing, and industrial automation, the FMU671 delivers precision measurement without direct media contact — eliminating wear, contamination risk, and maintenance downtime.
Where This Product Is Used
The FMU671 is specified across a wide range of demanding industrial environments:
- Water & Wastewater Treatment: Open channel flow monitoring, pump station wet well level control, clarifier and sedimentation tank management
- Chemical & Petrochemical Plants: Acid/alkali storage tank level, solvent vessel monitoring, corrosive media measurement without sensor immersion
- Food & Beverage Processing: Hygienic tank level monitoring for silos, buffer tanks, and ingredient storage
- Mining & Bulk Solids Handling: Ore, grain, cement, and aggregate silo level detection
- Pulp & Paper Industry: Chest and vat level control in high-humidity environments
- Power Generation: Cooling water reservoir and ash pond level monitoring
- Building Automation: Rainwater harvesting tanks, HVAC condensate sumps
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | FMU671 |
| Series | Nivosonic |
| Manufacturer | Endress+Hauser (E+H) |
| Measurement Principle | Ultrasonic, non-contact |
| Measuring Range | Up to 10 m (liquids) / 5 m (solids) |
| Accuracy | ±3 mm typical |
| Process Temperature | -20 °C to +60 °C |
| Output Signal | 4–20 mA / HART |
| Power Supply | 12–36 V DC |
| Protection Rating | IP68 |
| Process Connection | G 1½ / NPT 1½ thread |
| Housing Material | PBT (polybutylene terephthalate) |
| Approvals | CE, ATEX (Ex version available) |
| Weight | Approx. 1.12 kg |
Why Engineers Specify This Model
- Zero Media Contact: Ultrasonic pulse technology measures level without touching the process media — ideal for corrosive, viscous, or contaminating substances
- Plug-and-Play Setup: Integrated temperature compensation and automatic false-echo suppression reduce commissioning time significantly
- Robust IP68 Rating: Fully submersible housing withstands wash-down, condensation, and outdoor installation
- Universal Compatibility: 4–20 mA / HART output integrates directly with Siemens, Rockwell, Schneider, and Yokogawa DCS/PLC systems
- Low Total Cost of Ownership: No moving parts, no wear components — maintenance intervals are minimal compared to float or guided-wave alternatives
- Proven Endress+Hauser Reliability: Backed by global service network and decades of field-proven installations
Complete System Bill of Materials
For a complete non-contact level measurement loop using the FMU671, engineers typically specify:
- FMU671 — Nivosonic ultrasonic level sensor (this unit)
- FMU90 / RIA15 — Remote display and transmitter unit (if separate display required)
- Mounting bracket / flange adapter — For tank top or nozzle installation
- M12 / cable gland — Weatherproof cable entry for field wiring
- HART modem / FieldCare — For digital configuration and diagnostics
- PLC/DCS analog input card — 4–20 mA signal receiver at control system
Compliance & Industry Standards
- CE Marking — EU Machinery and EMC Directives
- ATEX / IECEx — Hazardous area versions available on request
- IP68 — IEC 60529 ingress protection
- NAMUR NE 43 — Signal failure behavior for 4–20 mA loops
- HART 5 / HART 7 — Digital communication protocol compliance
- RoHS compliant
Quality Assurance & Sourcing
At Konmask.com, every Endress+Hauser FMU671 unit is:
- Sourced from authorized distributors or verified surplus channels with full traceability
- Inspected for physical integrity, label authenticity, and firmware version prior to dispatch
- Shipped with original packaging where available, or protective anti-static packaging
- Backed by our 90-day quality guarantee on all stocked units
We specialize in sourcing hard-to-find and long-lead-time E+H instrumentation for MRO, plant expansion, and emergency replacement scenarios.
How to Source This Part
Ready to order or need a formal quotation? Contact our technical sales team:
- Email: [email protected]
- Phone / WhatsApp: +0086 19859288691
- Website: https://Konmask.com
Please provide your required quantity, delivery timeline, and any specific firmware or approval requirements (e.g., ATEX zone classification) when enquiring.
Application-Specific FAQ
Q: Can the FMU671 measure aggressive chemicals such as HCl or NaOH?
A: Yes. Because the sensor operates without media contact, it is well-suited for corrosive liquids. Ensure the sensor face material (PVDF or PBT depending on variant) is compatible with vapor exposure.
Q: What is the minimum detectable level (blanking distance)?
A: The FMU671 has a blanking distance of approximately 0.25 m from the sensor face. Levels within this zone cannot be reliably measured.
Q: Is HART configuration required for basic operation?
A: No. The FMU671 can be configured via the local keypad for standard 4–20 mA output without a HART communicator. HART is optional for advanced diagnostics.
Q: Can this sensor be used outdoors?
A: Yes. The IP68 rating and UV-resistant housing make it suitable for outdoor installation. A sunshield is recommended in high-solar-radiation environments.
Q: What is the difference between FMU671 and FMU672?
A: The FMU672 offers an extended measuring range (up to 15 m) and enhanced false-echo suppression for more complex vessel geometries. The FMU671 is the standard range model for most industrial applications.
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Contact: [email protected] | +0086 19859288691
