RFC Metal Tube Rotameter
The RFC Series Metal Tube Rotameter features a robust all-metal tapered tube construction. Float displacement is transmitted to the indicator via magnetic coupling, providing local pointer indication of instantaneous flow rate. Remote output options include 4–20 mA, HART, and FF, making the instrument suitable for process control in petroleum, chemical, metallurgical, power, and pharmaceutical applications.
Technical data
| Accuracy: | Class 1.5 (standard), Class 1.0 (custom) | Process Temperature: | Standard: -20 to +100°C; High-temperature: +100 to +450°C |
| Process Pressure: | DN15–DN50: ≤4.0 MPa; DN65–DN200: ≤1.6 MPa (up to 32 MPa available on special order) | Nominal Size: | DN15–DN200 |
| Ingress Protection: | IP65 / IP66 / IP67 |
Features & Benefits
Excellent Micro-Flow Performance
The metal tube variable area flowmeter is purpose-built for low-velocity, small-flow applications. On the DN15 size, the lower measurable flow rate for water starts as low as 10 L/h—a range where magnetic and vortex meters cannot operate. It is the cost-effective choice for chemical dosing, solvent blending, and low-capacity gas measurement.
Dual Indication, Field and Control Room Combined
The dial pairs a mechanical aluminum pointer with a backlit LCD screen for simultaneous indication of instantaneous and totalized flow during on-site inspection. Remote outputs include 4–20 mA, HART, RS485, Profibus-PA, and FF, seamlessly integrating with DCS systems. The mechanical pointer remains visible even without external power.
Full Temperature and Pressure Coverage
Standard versions cover –20 °C to 100 °C, high-temperature versions up to 450 °C (400 °C in explosion-proof variants), and cryogenic versions down to –80 °C, with pressure ratings up to 32 MPa. A heat-jacketed version is available to prevent solidification or crystallization of process media, suitable for steam or thermal oil tracing services.
Wide Material Selection for Corrosive Service
Wetted parts are available in 304, 316L stainless steel, or fully PTFE/PFA-lined construction to handle hydrochloric acid, hypochlorite, organic solvents, and other aggressive fluids. Flanged, threaded, clamped, and jacketed connections meet diverse disassembly and sealing requirements
Stable and Reliable, Full Explosion-Proof Certification
A uniform magnetic field and multi-stage metering tube deliver better scale linearity; a magnetic damping system suppresses pointer flutter, while a geomagnetic compensation circuit eliminates stray magnetic interference. The full range is certified to Ex db flameproof, Ex ia intrinsic safety, and dust-ignition-proof standards. With no wearing parts, long-term maintenance is minimal.
Applications
Petrochemical small-flow control
additives, catalysts
Chemical batching
dyes, solvents, acids and bases at low flow rates
Pharmaceutical liquid preparation
API and injection batching
Food & beverage
low-flow addition of colorants and flavorings
Metallurgical gases
protective gas and fuel gas flow indication
Case Studies
Wanhua Chemical Group Materials Co., Ltd. – Penglai, Yantai and Fujian Industrial Park
Wanhua Chemical is a global leader in MDI. 1,084 metal-tube variable-area flowmeters are deployed across its Penglai, Yantai and Fujian industrial parks, handling chlorine, phosgene, aniline, solvents and chilled brine for additive dosing, seal purging and cooling branches. Reliable local indication supports continued selection across multiple sites.
Henan Shenma Aramid Technology Development Co., Ltd. – 4 kt/a Para-Aramid Project
Henan Shenma is a leading domestic para-aramid producer. 398 metal-tube variable-area flowmeters serve the 4 kt/a para-aramid project, measuring concentrated sulfuric acid, DMAC solvent and spinning dope — highly corrosive and viscous media. Stable low-flow measurement supports continuous spinning operation and product consistency.
Shandong Genyuan Biological Technology Co., Ltd. – 10 kt/a VC (Vinylene Carbonate) Distillation Unit
Shandong Genyuan is a core supplier of lithium battery electrolyte additives. 331 metal-tube variable-area flowmeters serve the 10 kt/a vinylene carbonate (VC) distillation unit, measuring feed, reflux and overhead draw-off at low to medium flow rates. Direct local indication safeguards distillation efficiency and product purity.
Xiahe Technology (Jiangsu) Co., Ltd. – New OLED Materials Mass Production
Xiahe Technology is a key domestic producer of mass-produced OLED emissive materials. 172 metal-tube variable-area flowmeters serve the new OLED materials mass production facility, measuring small flows of high-purity organic solvents, nitrogen blanket gas and cooling water. Small-bore configurations deliver accurate and reliable measurement, supporting synthesis and purification of high-purity materials.
