Metal tube rotor flowmeters are flow measurement instruments based on the variable area principle, capable of monitoring small to medium flow rates of liquids, gases, and steam. They measure flow rate by the change in the position of a float within a tapered tube, and transmit the signal via magnetic coupling. Features include: compact structure, wide range ratio (10:1), and easy installation.
Core Features and Parameters
1. Measurement Principle
The float rises within the conical tube under hydrodynamic force. The equilibrium position corresponds to the flow rate. Magnetic coupling enables contactless signal transmission.
2. Structure and Materials
Conical Tube Material: Stainless steel (SUS304/316L), titanium, or PTFE lining (corrosion resistant).
Float Characteristics: Built-in magnet, wear-resistant, suitable for high-temperature (-80～400℃) and high-pressure (≤6.4MPa) environments.
3. Measuring Range and Accuracy
Water: 2.5-200,000 L/h; Air: 0.03-4000 m³/h (20℃).
Accuracy: ±1.5% (standard type), ±1.0% (special type).
4. Output Functions
Local indication (pointer/LCD), 4-20mA current signal, pulse/upper/lower limit alarm output, supports HART protocol.
Application Areas
Chemical/Petrochemical: Corrosion-resistant design suitable for acid, alkali, and steam measurement (e.g., caustic soda process).
Energy & Environmental Protection: Gas flow monitoring requires a gas damper to stabilize readings.
Pharmaceutical/Food: Sanitary grade materials meet CIP cleaning requirements.
Special Scenarios: Explosion-proof type (ExiaIICT3～6) for flammable environments; horizontal installation type adapts to pipeline layouts.
Installation and Maintenance Points
1. Installation Requirements
For vertical installation, the inclination angle ≤2°, the straight pipe section inlet ≥5DN, and the outlet ≥250mm.
Media containing ferromagnetic impurities require a pre-filter; media containing solid particles require a Y-type filter.
2. Maintenance Recommendations
Regularly clean the cone tube and float to prevent impurity buildup; for PTFE-lined systems, tighten bolts symmetrically to prevent deformation.
If the pointer is stuck, open the valve slowly to avoid float impact; regularly check the magnetic coupling system to prevent malfunction.
Summary
Metal tube rotor flowmeters, with their all-metal structure (resistant to high pressure and high temperature) and modular design (explosion-proof/corrosion-proof optional), are ideal for industrial process control. Users should select the appropriate model based on media characteristics (corrosiveness/viscosity) and operating conditions (temperature/pressure), and strictly follow installation specifications to ensure measurement accuracy. Kiel Planck (Kiel China)
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