AITOLY MFC330 Thermal Mass Flow Controller

Overview

The AITOLY MFC330 is a precision-engineered thermal mass flow controller designed for stable, repeatable, and pressure- and temperature-insensitive gas flow measurement and control in laboratory, pilot-scale, and light industrial applications. It operates on the principle of constant-temperature anemometry (CTA), where a heated capillary tube sensor—mounted within a precisely calibrated bypass channel—measures heat transfer differential between upstream and downstream thermistors. This thermal dispersion method enables direct mass flow measurement (in standard cubic centimeters per minute or standard liters per minute) without requiring separate pressure or temperature compensation, provided the gas composition remains consistent and the medium is clean and dry.

Key Features

• Capillary-tube thermal sensor architecture ensures high signal-to-noise ratio and long-term zero stability
• Integrated proportional control valve with normally closed (NC) configuration for fail-safe operation
• Wide dynamic control range of 1–100% FS (1:100) and extended measurement capability from 0.5–100% FS (1:200)
• Low-pressure drop design compatible with differential operating pressures up to 1 MPa
• Fast closed-loop response time (<3 seconds) suitable for real-time process feedback and sequencing
• Thermal compensation algorithms minimize drift across ambient temperature fluctuations (15–40 °C recommended operating range)
• Optional front-panel digital display for local setpoint adjustment and real-time flow readout
• All-metal valve option available for enhanced chemical compatibility and longevity in corrosive or ultra-high-purity environments

Sample Compatibility & Compliance

The MFC330 is validated for use with clean, dry, non-condensing gases exhibiting ≥98% purity—such as N₂, O₂, Ar, He, H₂, CO₂, CH₄, and synthetic air. Particulate filtration (≤0.1 µm) and dew point control (<−20 °C) are strongly recommended upstream to prevent sensor fouling or thermal boundary layer disruption. While not certified to ISO 17025 or ANSI Z540, the device conforms to general metrological practices outlined in ISO 9001-compliant manufacturing workflows. Its analog (0–5 V / 4–20 mA) and digital (RS-485 Modbus RTU) interfaces support integration into systems governed by GLP or GMP frameworks when paired with appropriate audit-trail-capable SCADA or PLC platforms.

Software & Data Management

The MFC330 supports both analog and digital communication protocols. Analog outputs provide immediate compatibility with legacy DAQ systems, while RS-485 Modbus RTU enables multi-device daisy-chaining and centralized configuration via host software. Optional PC utilities allow for firmware updates, calibration coefficient management, and batch logging of flow setpoints, actual readings, and valve position data at user-defined intervals. When deployed in regulated environments, timestamped operational logs—including warm-up status, valve actuation count, and over-range events—can be exported for internal review or regulatory documentation. The device does not natively implement FDA 21 CFR Part 11 electronic signature functionality; however, its deterministic behavior and deterministic response timing make it suitable for validation under Annex 11 or ICH GCP guidelines when embedded in qualified systems.

Applications

• Gas delivery control in semiconductor process tools (e.g., CVD, PECVD, etch tool purge lines)
• Calibration reference in gas analyzer verification rigs and environmental chamber dosing systems
• Flow regulation in analytical instrumentation including GC carrier gas modules and FTIR sample cells
• Controlled atmosphere generation for material synthesis reactors and catalytic testing benches
• Research-grade gas blending systems requiring stoichiometric precision across multiple inlet streams
• Medical device testing setups requiring reproducible airflow profiles (e.g., ventilator bench validation)

FAQ

What gases can the MFC330 measure accurately?
It is calibrated for common industrial and laboratory gases with ≥98% purity and no condensables—N₂, O₂, Ar, He, H₂, CO₂, CH₄, and synthetic air. Custom calibration for other gases is possible upon request.

Is temperature and pressure compensation required during operation?
No—because it is a thermal mass flow device, output is inherently referenced to standard conditions (typically 0 °C and 101.325 kPa). However, gas composition must remain fixed; changes require recalibration or use of built-in gas selection tables if supported by firmware version.

Can the MFC330 operate at vacuum or negative inlet pressure?
It is rated for differential pressure up to 1 MPa but requires positive absolute inlet pressure. Operation below atmospheric pressure (e.g., downstream of a vacuum pump) is not supported unless used in a back-pressure regulated configuration.

How often should the unit be recalibrated?
Annual recalibration is recommended for critical applications. Drift is typically <±0.1% FS/year under stable environmental and usage conditions. Factory recalibration includes zero and span verification across the full flow range.

Does the device support digital bus protocols beyond Modbus RTU?
Standard configuration includes RS-485 Modbus RTU only. CANopen or EtherCAT variants are not available; however, protocol translation gateways may be integrated externally.