The Rosemount 8705 Flanged Magnetic Flow Meter Sensor is engineered to deliver long-lasting, reliable performance in the most challenging applications. Designed with an all-welded construction, this sensor provides a hermetic seal that guards against moisture and other contaminants, ensuring peak performance in aggressive environments.
For operations in the harshest environments, the Rosemount 8705 offers a fully welded sensor housing that protects all internal components and wiring. This obstructionless design features no moving parts, which serves to minimize maintenance and repair costs over the life of the device. If your installation has space constraints that prevent using a flanged model, consider our Rosemount 8711 Wafer Flow Meter as a compact, cost-effective alternative.
With a wide range of line sizes from 1/2 to 36 inches (15-900 mm), the 8705 accommodates a vast spectrum of industrial needs. Operators can customize the sensor with a variety of rugged liner materials, such as PTFE, ETFE, PFA, and Polyurethane, and electrode materials including 316L Stainless Steel, Nickel Alloy, Platinum, Tantalum, and Titanium. To further guard against installation damage and leading-edge wear, optional lining protectors are available for added durability.
The Rosemount 8705 provides industry-leading precision, offering up to 0.15% of volumetric flow rate accuracy. It is designed for total interchangeability, maintaining compatibility with all Rosemount 8700 Series transmitters. In complex plant systems, these meters often work alongside Rosemount 3051S Pressure Transmitters to provide comprehensive process data.
To help you avoid process shutdown, the sensor features a unique removable and replaceable terminal block. This innovative feature enables easy repair in the field. You can see the robust build quality and our ready-to-ship inventory of these heavy-duty sensors in our Warehouse Stock Video.
| Feature | Specification Details |
| Line Sizes | 1/2" to 36" (15 to 900 mm) |
| Accuracy | Up to 0.15% of volumetric flow rate |
| Liner Materials | PEX, PTFE, ETFE, PFA, Polyurethane, Neoprene, Linatex |
| Electrode Materials | 316L SS, Nickel Alloy, Platinum, Tantalum, Titanium |
| Flange Ratings | ASME B16.5 Class 150-2500; DIN PN 10-40; AS 2129 |
| Environmental Protection | IP68 Submergence Protection; All-welded Hermetic Seal |
| Feature | Rosemount 8705 (Heavy-Duty) | Rosemount 8711 (Economical Wafer) |
| Connection Type | Flanged – Bolts pass through meter flanges | Wafer (Flangeless) – Clamped between pipe flanges |
| Design Intent | Heavy-Duty for aggressive environments | Compact & Economical for general use |
| Form Factor | Larger, standard lay length, all-welded housing | Ultra-short, lightweight, and compact |
| Space Requirement | Requires standard footprint | Space-Saving, ideal for tight skids or narrow pipes |
| Cost Profile | Higher investment (robust construction) | Cost-Effective, ideal for budget-conscious projects |
| Line Size Range | 1/2" to 36" (15mm - 900mm) | 0.15" to 8" (4mm - 200mm) |
| Durability | Superior resistance to high pressure & wear | Simplified handling and easier installation |
| Liner Options | Broadest range (incl. Polyurethane, Neoprene) | Focused on chemical resistance (ETFE, PTFE, PFA) |
| Safety Features | Optional secondary containment (leak capture) | Alignment spacer kits included (for perfect centering) |
Q: What are the benefits of the all-welded sensor housing on the Rosemount 8705?
A: The all-welded construction provides a hermetic seal that protects internal wiring and components from moisture and aggressive contaminants, ensuring maximum reliability in harsh environments.
Q: Can the Rosemount 8705 be repaired in the field?
A: Yes, the sensor features a removable and replaceable terminal block that enables easy repairs in the field without the need to replace the entire meter, helping to avoid process shutdown.
Q: What line sizes are available for this magnetic flow meter?
A: The Rosemount 8705 is available in line sizes ranging from 1/2 inch to 36 inches (15 to 900 mm).
Q: How does the Rosemount 8705 handle potential leakage?
A: It offers optional secondary containment compartments to surround the electrodes and capture any potential process fluid leakage.
