Emerson Rosemount 8705 Flanged Magnetic Flow Meter Sensors
• Sizes Available: ½″–36″ (15 mm–900 mm)
• Accuracy:
o Standard: ±0.25% of rate over 40:1 turndown
o High Accuracy option: ±0.15% over 13:1
• Flow Range: Up to ~12 m/s (39.4 ft/s)
• Flange Ratings: ASME B16.5 Class 150–2500, DIN PN10–40, AWWA C207 Class D (30–36″)
• Coil Drive & Resistance: Pulsed DC; 7–16 Ω coil resistance
• Protection: IP68 (when sealed properly)
• Construction: Fully welded, hermetically sealed; replaceable terminal block; no moving parts
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Description
📊 Technical Specifications
Service: Conductive liquids & slurries (≥ 5 μS/cm conductivity)
Flow Range: 0.01–12 m/s (0.04–39 ft/s), bi-directional
Accuracy:
• Standard: ±0.25% of flow rate (over 40:1 turndown)
• High Accuracy option: ±0.15% (over 13:1 turndown)
Repeatability: ±0.1% of reading
Response Time: ≤ 0.2 s to step change
🔧 Mechanical & Electrical
Line Sizes: ½″–36″ (15–900 mm)
Coil Drive: Pulsed DC
Coil Resistance: 7 16 Ω (sensor); transmitter drive ~500 mA
Materials:
• Liner: PTFE, ETFE, PFA, Polyurethane, Neoprene, Linatex
• Electrodes: 316L SS, Nickel Alloy C 276, Platinum/Iridium, Tantalum, Titanium
Flange Ratings:
• ASME B16.5 Class 150–2500
• DIN PN10–40
• AWWA C207 Class D for 30–36″ sizes Construction: Fully welded, hermetically sealed coil housing; IP68 rated (with sealed glands); removable/replaceable terminal block
🧩 Installation & Compatibility
Compatibility: Works with 8700 series transmitters (8712/8732/8742) and earlier models (8712C/D, 8732C, 8742C)
Mounting Orientation: Horizontal within ±45° of centerline or vertical; requires 5 upstream & 2 downstream pipe diameters straight-run
Flange Bolt Torque: Refer to sensor piping data sheets; e.g., for PTFE/ETFE liners, torque ranges from 8 lbf·ft (½″) up to 280 lbf·ft (36″)
Gaskets: Use flat gaskets; do NOT use spiral wound/flexitallic types
⚙️ Performance & Diagnostics
• Low flow Cut off: Adjustable (0.01–0.3 m/s)
• Over range Handling: Linear to 110% URV, then outputs hold; transmitter flags over range
• Diagnostics: Advanced options available (grounding, signal noise, calibration verification, etc.) via DA1/DA2
🌡️ Operating Conditions
• Process Temperature: Up to 177 °C (350 °F) for PFA liners
• Pressure: Full vacuum to maximum flange rating; check flange class for pressure limits
• Submergence: IP68 continuous immersion to 10 m (30 ft)
