AITOLY MFC330 Thermal Mass Flow Controller

Overview

The AITOLY MFC330 is a precision-engineered thermal mass flow controller designed for stable, repeatable, and traceable gas flow management in laboratory, pilot-scale, and light industrial applications. It operates on the principle of constant-temperature anemometry (CTA), where a heated capillary tube serves as both sensor and thermal reference. As gas flows across the heated element, convective heat transfer alters the local temperature gradient; this differential is detected via a Wheatstone bridge circuit and converted into a proportional analog voltage or current signal. The embedded microprocessor applies real-time temperature and pressure compensation—using integrated Pt100 RTD and piezoresistive pressure sensors—to convert raw thermal signals into true mass flow rates (sccm or slpm), independent of upstream pressure fluctuations or ambient temperature drift. Unlike volumetric devices, the MFC330 delivers direct mass-based measurement without reliance on ideal gas law assumptions, ensuring metrological consistency across varying process conditions.

Key Features

• Thermal mass flow sensing with built-in temperature and absolute pressure compensation for high metrological integrity
• Closed-loop flow control architecture with PID algorithm execution at 100 Hz sampling rate
• Stainless steel proportional solenoid valve (normally closed) with hysteresis 10 million cycles
• Wide operating pressure range: 0–1 MPa (gauge), enabling integration into vacuum, ambient, and moderate-pressure gas delivery systems
• Low pressure drop (<1 kPa at full scale), minimizing system backpressure and energy loss
• Multi-gas calibration capability—factory-configured for 98+ gases including N₂, O₂, Ar, He, CO₂, H₂, CH₄, and synthetic air—with user-selectable gas tables via Modbus
• Modular hardware design supporting optional OLED display, full-metal wetted path (316L SS), and NIST-traceable calibration documentation

Sample Compatibility & Compliance

The MFC330 is validated for use with clean, dry, non-condensing, and chemically non-aggressive gases. Particulate filtration (≤0.3 µm) and dew point control (<−20 °C) are recommended upstream to ensure long-term sensor stability and avoid thermal contamination. It complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions) for industrial environments. While not certified for hazardous locations, its low-power design (max. 5 W) and reinforced insulation meet UL/CSA Class 1, Division 2 general-purpose requirements. For regulated environments, firmware supports audit trail logging (timestamped setpoint changes, valve position, and measured flow), aligning with GLP/GMP documentation expectations per FDA 21 CFR Part 11 when paired with compliant data acquisition software.

Software & Data Management

Configuration and monitoring are supported via RS485 Modbus RTU (slave ID configurable), enabling seamless integration into SCADA, PLC, and LabVIEW-based control systems. The device stores up to 16 gas-specific calibration curves internally; users may load custom coefficients using AITOLY’s PC-based Configuration Utility (Windows/Linux). All operational parameters—including setpoint history, valve duty cycle, and thermal error flags—are accessible via register mapping. Optional firmware upgrades include enhanced PID tuning presets (e.g., “fast response” vs. “low overshoot”) and extended diagnostics (sensor drift trending, valve coil resistance monitoring). Raw flow data output is linearized and compensated prior to transmission—no post-processing required.

Applications

The MFC330 is routinely deployed in semiconductor process tool purging, fuel cell test benches, catalytic reactor feed control, environmental chamber gas blending, analytical instrument carrier gas regulation (e.g., GC, ICP-MS), and university research labs conducting gas-phase reaction kinetics. Its 1:100 control turndown and sub-second response make it suitable for dynamic flow profiling, while its ±0.2% FS repeatability ensures statistical confidence in long-duration experiments. In multi-channel gas delivery systems, multiple MFC330 units can be daisy-chained on a single RS485 bus, reducing cabling complexity and enabling synchronized ramping sequences.

FAQ

What gases can the MFC330 measure accurately?
The unit ships pre-calibrated for 98 standard gases; custom calibrations for specialty gases (e.g., silane, NF₃, C₂F₆) are available upon request with certified reference standards.
Is temperature and pressure compensation performed internally?
Yes—integrated Pt100 RTD and piezoresistive pressure transducer enable real-time compensation without external instrumentation.
Can the MFC330 operate under vacuum conditions?
It functions reliably down to 10 kPa abs; for sub-atmospheric applications below 50 kPa, consult AITOLY’s vacuum-rated variant (MFC330-VAC) with modified valve dynamics.
Does the device support digital communication protocols other than Modbus RTU?
Standard firmware supports only Modbus RTU over RS485; CANopen or EtherCAT interfaces require OEM-level customization and minimum order quantities.
How is calibration traceability maintained?
Each unit ships with a NIST-traceable calibration certificate (ISO/IEC 17025 accredited lab); recalibration intervals are recommended every 12 months under continuous operation or after exposure to particulate/condensate events.