The KOFLOC RK1200-SS-K-1/4-N2-10 is a high-precision variable area flowmeter (Rotameter) belonging to the renowned RK1200 Series manufactured by KOFLOC (Kojima Instruments Inc., Japan). Regarded as a premier benchmark for industrial gas flow monitoring, the RK1200 series provides exceptional measurement accuracy, high mechanical durability, and long-term repeatability.

Fabricated with premium stainless steel (SUS316/SUS304) wetted parts, the instrument features a hard-tempered Pyrex glass metering tube with crisp, high-visibility graduated scale markings that remain legible even under rigorous industrial use. It comes equipped with a built-in precision micro needle valve (Type K), ensuring smooth, ripple-free flow adjustment across low to standard flow bands. Specifically calibrated for Nitrogen gas (N2) within an operating pressure range of 0.2 MPa to 0.6 MPa, it is an ideal solution for critical cleanroom facilities, semiconductor manufacturing, chromatography purge lines, analytical chambers, and inert atmosphere blanketing.

• Manufacturer: KOFLOC (Kojima Instruments Inc.)
• Brand Origin: Japan
• Full Model Designation: RK1200-SS-K-1/4-N2-10-(0.2MPa-0.6MPa)
• Product Classification: Precision Variable Area Flowmeter / Purge Rotameter
• Fluid Service: Nitrogen Gas (N2)
• Nominal Flow Rate: 1 – 10 L/min (Standard N2 calibration)
• Calibrated / Operating Pressure: 0.2 MPa – 0.6 MPa
• Maximum Operating Pressure: 0.8 MPa (8 bar / approx. 116 psi)
• Proof Pressure: 1.0 MPa (10 bar)
• Flow Measurement Accuracy: ±2% F.S. (Full Scale)
• Repeatability: ±0.5% F.S.
• Flow Control Valve: Built-in precision micro needle valve (Type K)
• Valve Placement: Integrated at bottom inlet (Bottom IN)
• Process Connections: 1/4 inch (Rc 1/4" or NPT 1/4" industrial standard female thread)
• Flow Direction: Vertical bottom-to-top flow (Bottom IN - Top OUT)
• Body & Block Material: Stainless Steel (SUS304 / SUS316)
• Tapered Tube Material: High-grade Borosilicate Pyrex Glass
• Float Material: SUS316 Stainless Steel or Pyrex (range dependent)
• O-Ring / Gasket Material: FKM (Viton) / NBR chemical-resistant elastomers
• Operating Temperature Range: 0°C to 60°C (Fluid & Ambient)
• Mounting Configuration: Panel mount design with integrated rear mounting nuts
• Target Applications: Cleanroom N2 purge, gas chromatography carrier flow control, inert welding shielding gas, analytical dry box purges, and high-purity industrial packaging