The KOFLOC RK1700-V-B-1/4-N2-10L/MIN-70KPa is a compact, high-sensitivity variable area flowmeter (Rotameter) belonging to the acclaimed RK1700 Series manufactured by KOFLOC (Kojima Instruments Inc., Japan). The RK1700 Series is specifically optimized for applications demanding high measurement accuracy under low operational pressures (70 kPa ~ 0.07 MPa), ensuring steady, pulsation-free gas delivery.

Engineered with a robust mechanical body and a high-grade Borosilicate Pyrex glass metering tube, the unit provides exceptional pressure tolerance and corrosion resistance. The scale graduations are sharply laser-etched to deliver clear, long-term readability without risk of fading. This specific configuration features premium FKM/Viton (V) elastomer seals for enhanced thermal and chemical compatibility, alongside an integrated bottom micro needle valve (B) that allows fine, effortless adjustment of Nitrogen (N2) flow up to 10 L/min. It serves as an ideal flow control solution for dry storage cabinets, inert purge lines, analytical spectrophotometers, and precision semiconductor assembly lines.

• Manufacturer: KOFLOC (Kojima Instruments Inc.)
• Brand Origin: Japan
• Full Model Designation: RK1700-V-B-1/4-N2-10L/MIN-70KPa
• Product Classification: Precision Variable Area Flowmeter / Compact Rotameter
• Fluid Service: Nitrogen Gas (N2)
• Full Scale Flow Range: 1 – 10 L/min (Calibrated for N2)
• Calibrated Operating Pressure: 70 kPa (approx. 0.07 MPa / 0.7 bar)
• Maximum Operating Pressure: 0.5 MPa – 0.7 MPa
• Proof Pressure: 0.8 MPa
• Measurement Accuracy: ±2% F.S. (Full Scale)
• Repeatability: ±0.5% F.S.
• Flow Adjustment Mechanism: Integrated precision micro needle control valve
• Valve Configuration: Bottom inlet control valve (Code B)
• Sealing Material: High-performance FKM / Viton O-rings (Code V)
• Process Connections: 1/4 inch female threaded connection (Rc 1/4" or NPT 1/4")
• Flow Direction: Vertical bottom-inlet to top-outlet (Bottom IN - Top OUT)
• Body & Block Material: Stainless Steel (SUS304/SUS316) or chrome-plated corrosion-resistant alloy
• Tapered Metering Tube: High-grade Borosilicate Pyrex Glass
• Float Material: Precision-machined SUS316 Stainless Steel
• Operating Temperature Range: 0°C to 60°C (Fluid & Ambient)
• Mounting Configuration: Panel mount design with rear securing hardware
• Typical Applications: Nitrogen blanketing for welding boxes, anti-oxidation dry cabinets, carrier gas monitoring in chromatography, laboratory sample purging, and industrial inert atmosphere regulation