Ahkemi GDT-MFC-4 Quad-Channel Gas Mixing System
| Brand | Ahkemi |
|---|---|
| Origin | Anhui, China |
| Model | GDT-MFC-4 |
| Gas Channels | 4 independent mass flow controlled lines |
| Control Interface | Industrial-grade 7-inch TFT touch HMI |
| Construction | Hermetically sealed stainless-steel manifold enclosure (316L tubing + dual ferrule fittings) |
| Pressure Rating | Up to 3 MPa (max operating pressure for flow sensors) |
| Pressure Measurement Range | –0.1 to 0.15 MPa (0.01 MPa per division) |
| Temperature Operating Range | 5–45 °C |
| Control Accuracy | ±1.5% of Full Scale (FS) |
| Compliance | Designed for integration with tube furnaces and atmospheric/low-pressure reaction systems |
| Power Supply | 220 VAC, 50/60 Hz |
| Communication | RS485 Modbus RTU (optional Ethernet/IP upon request) |
Overview
The Ahkemi GDT-MFC-4 Quad-Channel Gas Mixing System is an engineered solution for precise, repeatable, and programmable gas blending in laboratory-scale thermal processing environments. Unlike generic gas manifolds or manual needle-valve setups, this system implements four independent thermal mass flow controllers (MFCs), each calibrated for a specific gas species (e.g., N₂, Ar, O₂, H₂, CO, NH₃, or custom mixtures), enabling real-time proportional control based on volumetric flow rate (SLPM) rather than pressure-dependent estimation. The system operates on the principle of constant temperature anemometry—where gas flow induces heat transfer across a heated sensor element—and delivers stable, temperature-compensated output signals traceable to NIST-certified standards. It is explicitly designed for seamless integration with horizontal and vertical tube furnaces, CVD/PVD reactors, catalyst evaluation units, and other high-temperature synthesis platforms requiring dynamic atmosphere switching or multi-gas co-flow conditions.
Key Features
- Four independently controllable mass flow channels, each equipped with a calibrated thermal MFC and integrated solenoid valve for on/off sequencing
- Hermetically sealed stainless-steel (316L) manifold housing with dual-ferrule compression fittings—ensuring leak integrity per ISO 15848-1 Class A requirements
- Industrial 7-inch resistive touch HMI with intuitive graphical interface: real-time flow visualization, setpoint ramping, step profiling, and alarm logging
- RS485 Modbus RTU communication protocol for PLC or PC-based supervisory control; optional Ethernet/IP gateway available for SCADA integration
- Full-scale accuracy of ±1.5% FS across the specified operating temperature range (5–45 °C), with built-in temperature compensation to minimize drift
- Pressure-rated construction up to 3 MPa at the MFC inlet—compatible with high-pressure cylinder sources and regulated delivery systems
- Integrated absolute pressure transducer (range: –0.1 to 0.15 MPa) with 0.01 MPa resolution for upstream/downstream differential monitoring
Sample Compatibility & Compliance
The GDT-MFC-4 supports inert, oxidizing, reducing, and mildly corrosive process gases—including but not limited to nitrogen, argon, oxygen, hydrogen, carbon monoxide, ammonia, and synthetic air—provided compatible wetted materials are selected (standard configuration uses 316L SS and Viton® seals). It complies with CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). While not intrinsically safe, it is suitable for use in non-hazardous laboratory zones classified under IEC 60079-0. For GLP/GMP-regulated applications, audit-trail functionality (timestamped parameter changes, user login logs, and calibration history export) can be enabled via firmware update.
Software & Data Management
The embedded controller firmware supports data logging at user-defined intervals (1 s to 600 s) directly to internal flash memory (≥100,000 records). Export is performed via USB-C port in CSV format for post-processing in MATLAB, Python (Pandas), or LabVIEW. Optional PC software (Ahkemi GasControl Suite v2.1) provides remote monitoring, multi-system synchronization, recipe management, and automated report generation compliant with FDA 21 CFR Part 11 (electronic signatures, audit trail, and role-based access control). All configuration parameters—including gas-specific K-factors, temperature compensation coefficients, and alarm thresholds—are stored in non-volatile memory with CRC-32 validation.
Applications
- Catalyst activation and regeneration under programmed gas sequences (e.g., O₂ calcination → H₂ reduction → N₂ purge)
- Atmosphere-controlled sintering and annealing in tube furnace systems
- Chemical vapor deposition (CVD) precursor carrier gas blending with precise stoichiometric ratios
- In-situ XRD or XAS experiments requiring rapid gas-switching without mechanical valve hysteresis
- Fuel cell electrode testing under variable humidified gas compositions
- Thermogravimetric analysis (TGA) with reactive gas environments
FAQ
Can the GDT-MFC-4 be used with flammable gases such as H₂ or CH₄?
Yes—provided appropriate explosion-proof auxiliary components (e.g., certified solenoid valves, vented enclosures, and gas detectors) are installed externally, and local safety regulations (e.g., NFPA 55, ATEX Category 3G) are followed.
Is calibration certificate included with shipment?
A factory calibration report (traceable to national metrology institutes) is provided; ISO/IEC 17025-accredited calibration is available as an optional service.
Does the system support analog 0–10 V or 4–20 mA input for external flow setpoints?
Yes—each channel accepts analog setpoint input via terminal block; configuration is configurable per channel in the HMI.
What is the minimum controllable flow rate per channel?
Depends on the selected MFC full-scale range; standard configurations include 0–50 sccm, 0–500 sccm, and 0–5 SLPM variants—custom ranges are available upon request.
How is firmware updated?
Via USB-C using signed firmware packages; updates preserve all user settings and logged data.
