The KOFLOC RK200U-V-1/4-Air/N2-1L/min-(0.15-0.1kpa) is an ultra-compact, high-precision variable area flowmeter (Rotameter) from the established RK200 Series manufactured by KOFLOC (Kojima Instruments Inc., Japan). This model is engineered specifically for applications demanding stable low-flow gas metering (1 L/min) under exceptionally low differential pressure conditions (0.15 - 0.1 kPa), preventing pressure loss and flow instability across sensitive gas delivery channels.

The instrument is precision-machined with a rugged body structure paired with a transparent Borosilicate Pyrex glass metering tube for exceptional thermal and chemical resilience. High-contrast laser-etched scale graduations ensure effortless visual verification of instantaneous flow rates with long-term legibility. Equipped with high-grade FKM/Viton elastomer seals (Code V) for superior chemical and aging resistance, along with standard 1/4" female threaded process connections, it integrates smoothly into various piping setups. It represents an ideal choice for analytical laboratory instrumentation, low-pressure micro leak detection units, inert optical purge cabinets, and semiconductor cleanroom lines.

• Manufacturer: KOFLOC (Kojima Instruments Inc.)
• Brand Origin: Japan
• Full Model Designation: RK200U-V-1/4-Air/N2-1L/min-(0.15-0.1kpa)
• Product Classification: Compact Precision Variable Area Flowmeter / Purge Rotameter
• Service Fluids: Clean Compressed Air or Nitrogen Gas (N2)
• Full Scale Flow Range: 0.1 – 1.0 L/min (Standard Air / N2 calibration)
• Calibrated Operating Differential Pressure: Low pressure range 0.15 kPa – 0.1 kPa
• Maximum Operating Pressure: 0.5 MPa (approx. 5 bar)
• Proof Pressure: 0.7 MPa
• Measurement Accuracy: ±2% F.S. (Full Scale)
• Repeatability: ±0.5% F.S.
• Flow Adjustment Mechanism: Integrated precision micro needle control valve
• Valve Configuration: Built-in bottom control valve (Inlet side regulation)
• Sealing Material: Chemical-resistant high-performance FKM / Viton O-rings (Code V)
• Process Connections: 1/4 inch female threaded connection (Rc 1/4" or NPT 1/4" industrial standard)
• Flow Direction: Vertical bottom-inlet to top-outlet (Bottom IN - Top OUT)
• Body & Block Material: Stainless Steel (SUS304 / SUS316) or corrosion-resistant chrome-plated brass
• Tapered Metering Tube: High-grade Borosilicate Pyrex Glass
• Float Material: Precision-machined SUS316 Stainless Steel or precision glass
• Operating Temperature Range: 0°C to 60°C (Fluid & Ambient)
• Mounting Configuration: Panel mount design with integrated rear mounting hardware
• Typical Applications: Low-pressure cleanroom air monitoring, gas chromatography sample purging, low-pressure micro leak testing benches, inert blanketing for sensitive electronic components, and precision semiconductor automation lines