Aitoly MFM330 Thermal Mass Flow Meter

Overview

The Aitoly MFM330 is a precision thermal mass flow meter engineered for high-reproducibility measurement of clean, dry gas flows in laboratory, pilot-scale, and light industrial applications. Based on constant-temperature anemometry (CTA), the MFM330 employs a dual-sensor thermal bridge configuration—comprising a heated element and a reference sensor—to directly infer mass flow rate from convective heat transfer dynamics. Unlike volumetric devices, it requires no pressure or temperature compensation for mass-based readings under standardized conditions (20 °C, 1 atm), delivering true mass flow output in standard cubic centimeters per minute (sccm) or standard liters per minute (slpm). Its design prioritizes stability over wide dynamic ranges (0.5–100% F.S.), minimal thermal drift, and immunity to upstream turbulence—making it suitable for integration into gas delivery systems, analytical instrument inlets (e.g., GC, ICP-MS), environmental simulation chambers, and semiconductor process tool purge lines.

Key Features

• Thermal dispersion sensing architecture with dual platinum RTD elements for high signal-to-noise ratio and long-term baseline stability.
• Internally stored correction factors for 98 distinct gases—including Ar, He, O₂, N₂, CO₂, NH₃, CH₄, and specialty process gases—enabling accurate mass flow calculation without external lookup tables.
• Configurable analog outputs (0–5 VDC or 4–20 mA) with ±0.05% F.S. linearity and 200 Hz update rate for real-time closed-loop control integration.
• Digital communication via Modbus RTU (RS232/RS485) and CAN bus, supporting configurable baud rates up to 115.2 kbps for deterministic data acquisition in distributed automation environments.
• Robust mechanical construction: 316 stainless steel flow body and FKM-sealed wetted surfaces rated for continuous operation at up to 3 MPa (30 bar) and ambient temperatures from –20 °C to +65 °C.
• Factory-calibrated in horizontal mounting orientation; alignment-sensitive installation ensures optimal thermal symmetry and minimizes buoyancy-induced error.

Sample Compatibility & Compliance

The MFM330 is validated exclusively for clean, dry, non-corrosive, non-particulate gases. It is not rated for vapors, aerosols, condensable species, or aggressive halogenated compounds. Its leak integrity (≤1×10⁻⁸ Pa·m³/s He) meets ISO 15848-1 requirements for low-emission instrumentation valves and fittings. While not certified to SIL or ATEX standards, its IP40-rated housing complies with IEC 60529 for protection against solid objects ≥1 mm. For regulated environments, the device supports audit-ready data logging when paired with Aitoly’s tiered flow management software—enabling timestamped event records, user-access logs, and exportable CSV reports traceable to GLP/GMP documentation workflows. Though not FDA 21 CFR Part 11–validated out-of-the-box, its deterministic digital output and immutable firmware revision tracking facilitate qualification under internal SOPs.

Software & Data Management

The Aitoly Stepwise Flow Software provides native configuration, real-time visualization, and batch export functionality for Windows-based host systems. Users may select gas type, adjust zero/span offsets, configure alarm thresholds, and define custom scaling for analog outputs. All parameter changes are logged with timestamps and operator IDs. The software supports automated calibration verification routines using known reference flows and generates PDF-formatted calibration certificates compliant with ISO/IEC 17025 traceability frameworks. Raw data streams (including instantaneous flow, temperature, and sensor voltage) are sampled at 500 Hz internally and decimated to user-defined intervals (10 ms–1 s) for storage—ensuring temporal fidelity without overwhelming host memory. Export formats include CSV, Excel, and MATLAB-compatible .mat files.

Applications

• Gas flow monitoring in inert atmosphere gloveboxes and nitrogen purged enclosures.
• Mass flow control in plasma etch and CVD reactor feed lines (N₂, Ar, O₂, CF₄).
• Leak testing subsystems requiring sub-sccm resolution and rapid response.
• Calibration transfer standards for field-deployable flow meters (per ASTM D6195).
• Environmental chamber air exchange rate validation (ISO 16000-22).
• Research-grade gas blending systems where stoichiometric accuracy depends on mass-based ratios rather than volumetric assumptions.

FAQ

Is the MFM330 suitable for measuring humid or contaminated gases?

No. The sensor requires clean, dry gas to prevent fouling of the thermal elements and avoid erroneous convection modeling. Condensation or particulates will degrade accuracy and may cause irreversible damage.

Can the device be mounted vertically or at an angle?

No. Calibration and thermal symmetry are strictly validated for horizontal mounting only. Deviation from this orientation introduces buoyancy-driven errors exceeding ±1% F.S.

Does the MFM330 support NIST-traceable calibration?

Yes—factory calibration is performed against NIST-traceable primary standards (e.g., laminar flow elements calibrated per ISO 14111) with full uncertainty budgets provided in the certificate of calibration.

What is the recommended warm-up time before achieving full accuracy?

5 minutes achieves functional readiness (T95), but 30 minutes is required to stabilize thermal gradients and meet the specified ±0.5% F.S. accuracy across the full operating range.

How is gas selection implemented during operation?

Gas type is selected via software or digital command (Modbus register 40001); the corresponding internal correction factor is applied in real time to the raw thermal signal—no hardware modification is needed.