The KOFLOC Model 8500MC Series Digital Mass Flow Controller with Integrated Display (Detailed Configuration Code: 8500MC0-0 / 8500MC-O-0) is 100% engineered, assembled, and calibrated in Japan by KOFLOC Corp. (Kojima Instruments Inc.) – an internationally recognized technological benchmark with more than 75 years of specialized innovation in micro-flow fluidics and analytical control instrumentation. Developed as the advanced, high-performance successor to the renowned MODEL 8300 Series, the Model 8500MC delivers superior operational versatility, dramatically enhanced industrial electromagnetic noise immunity, and walk-away convenience for critical automated gas regulation.

The decisive engineering advantage of the KOFLOC 8500MC0-0 is its comprehensive "all-in-one" integration within a compact footprint:
1. Integrated Digital Indicator & Programming Keypad: Outfitted with a bright 4-digit 7-segment LED display driven by a high-resolution 14-bit converter, the unit supports 4-1/2 digit precision visualization and configuration. Operators can monitor instantaneous mass flow rates, verify accumulated totalized consumption (0000 to 9999), set operational target values (SV setting), or execute up to 5 user-defined preset flow patterns directly from the front panel without requiring external programming consoles. The display features KOFLOC’s unique view point change function, ensuring crystal-clear visibility regardless of vertical, horizontal, or inverted cabinet mounting orientations.
2. High-Lift Solenoid Poppet Actuator: Utilizing an advanced normally-closed proportional solenoid poppet valve with a high-lift actuator, the compact instrument smoothly modulates broad dynamic flow ranges from 10 SCCM up to 20 SLM (N2 equivalent). The closed-loop servo controller delivers rapid settling within 2 seconds (0 to 98% of setpoint within ±2% F.S.) and provides fail-safe shutoff through automated auto-close logic whenever setpoints drop below 2% F.S.
3. Isolated Non-Exposed Thermal Sensor: The capillary thermal mass flow sensor isolates heat-generating electrical elements completely away from the flowing gas passage. This intrinsic safety design allows dependable, risk-free flow regulation of flammable gases including Hydrogen (H2), Methane (CH4), and LPG.

The KOFLOC 8500MC0-0 operates on a single standard industrial 24 VDC power supply (current consumption ≤ 300 mA), eliminating cumbersome ±15V dual supply requirements. It provides dual digital communications (RS232C or multi-drop RS485 supporting up to 31 networked MFC units on a single PC) alongside configurable analog I/O (0–5 VDC or 4–20 mA). Machined from corrosion-resistant SUS316 stainless steel with FKM/PTFE seals, the unit withstands operating pressures up to 500 kPa and proof pressures up to 980 kPa (approx. 10 bar) with an ultra-high vacuum Helium leak rate of ≤ 1 × 10^-8 Pa·m³/s. The KOFLOC 8500MC0-0 represents an indispensable metrological and process control standard for semiconductor fabrication, thermal processing furnaces, vacuum coating systems, and automated gas mixing test rigs worldwide.

• Manufacturer: KOFLOC Corp. (Kojima Instruments Inc.)
• Origin: 100% Japan (Kyoto, Japan)
• Product Series: Digital Mass Flow Controller with Built-in Indicator
• Model Designation: 8500MC0-0 (System Ordering Code: 8500MC-O-0 / MODEL 8500 Series)
• Lineage: Advanced successor to the renowned MODEL 8300 Series (dramatically enhanced electrical noise resistance)
• Display Specification (Code "0" / "O"): Built-in 4-digit 7-segment LED indicator and front-panel setting keys
• Intelligent Visualization Features:
  - Proprietary View Point Change Function (allows rotating display orientation to match mounting angles)
  - Simultaneous monitoring of instantaneous flow rate and totalized flow (Integral display: 0000 - 9999)
  - Display Reading Accuracy: ±0.1%
  - 14-bit A/D converter enabling high-resolution 4-1/2 digit display and micro-step operation
• Valve Mechanism: High-lift proportional solenoid actuator poppet valve (Normally-Closed configuration)
• Flow Capacity Range (Full Scale): 10 SCCM to 20 SLM (calibrated under standard N2 reference: 20 °C, 1 atm)
• Flow Control Dynamic Range: 2% to 100% of Full Scale
• Control Accuracy: Within ±1.0% F.S. (at 25 °C) or ±1.5% F.S. (at 20 °C)
• Measurement Repeatability: Within ±0.5% F.S. (at 20 °C)
• Response / Settling Time: Fast dynamic response, ≤ 2.0 seconds (for 0 to 98% settling within ±2% F.S.)
• Compatible Fluid Media: Clean dry air (Air), N2, O2, Ar, CO2, He, H2, and flammable gases (sensor heating element isolated from process gas)
• Flow Setting Modes:
  - Standard front-panel push-button key input
  - External analog setpoint input (0 to 5 VDC or 4 to 20 mA)
  - Pattern key input mode (up to 5 programmable preset operational flow patterns)
• Flow Rate Output Signal: Linear 0 to 5 VDC or 4 to 20 mA (selectable at order)
• Digital Communications: Standard onboard RS232C or RS485 (supports multi-drop network integration of up to 31 MFCs per host PC)
• Discrete Alarm Outputs: 2 configurable alarm channels (NPN open collector outputs, max 35 VDC, 50 mA)
• Automated Firmware Routines: Integrated Auto Zero tracking and Auto Close function (valve fully closes when command ≤ 2% F.S.)
• Allowable Operating Pressure: 500 kPa (G) or less
• Operating Differential Pressure: 50 to 300 kPa (F.S. ≤ 5 SLM) / 100 to 300 kPa (F.S. > 5 SLM)
• Proof Pressure Resistance: 980 kPa (G) (approx. 10 bar / 1.0 MPa / 145 psi)
• Helium Leak Integrity: ≤ 1 × 10^-8 Pa·m³/s He
• Electrical Interface: Half-pitch D-sub 20-pin connector (Hirose model DX10M-20S)
• Process Fitting Connections: 1/4" SWL double-ferrule compression fitting (or optional Rc 1/4, 1/4" VCR)
• Wetted Materials: SUS316 Stainless Steel, Viton (FKM), PTFE (optional Neoprene / NBR)
• Power Supply Requirements: 24 VDC ±10% (ripple 5%), current consumption ≤ 300 mA max
• Mounting Attitude: Universal mounting position (operates reliably horizontally, vertically, or inverted)
• Net Weight: Approx. 1,200 g (Heavy-duty EMI-shielded metal construction)
• Applicable Industries & Systems: Semiconductor and solar cell manufacturing tools, chemical vapor deposition (CVD/PVD), metal heat treatment atmosphere control, precision industrial burners, biotechnology bioreactors, gas chromatography analyzers, and automated industrial gas mixing panels.