KJ GROUP CGM-2F Compact Dual-Channel Gas Mixing System
| Brand | KJ GROUP |
|---|---|
| Origin | Liaoning, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | CGM-2F |
| Power Supply | None required |
| Flowmeter Range | 10–100 mL/min (dual independent channels) |
| Pressure Gauge Range | −0.1 to 1.0 MPa (0.01 MPa per division, three gauges) |
| Construction | SS304 precision needle valves |
| Tubing | 1/4″ stainless steel or PTFE |
| Dimensions | 340 mm × 300 mm × 180 mm |
| Weight | 6.35 kg |
Overview
The KJ GROUP CGM-2F Compact Dual-Channel Gas Mixing System is an engineered solution for precise, low-flow binary gas blending in controlled laboratory and process environments. Designed around the principle of pressure-regulated mass flow control without active electronics or external power, the CGM-2F leverages mechanical regulation—via calibrated SS304 needle valves and dual rotameter-based flow indication—to achieve reproducible gas mixture ratios in the 10–100 mL/min range. Its passive architecture eliminates electromagnetic interference, thermal drift from powered components, and dependency on stable AC supply—making it particularly suitable for integration into inert-atmosphere gloveboxes, small-scale tube furnaces, plasma etching chambers, and benchtop PECVD reactors where gas purity, stability, and operational simplicity are critical. The system operates on a constant-pressure differential principle: inlet gases at regulated upstream pressure pass through independently adjustable needle valves, with flow rates visually confirmed via borosilicate glass rotameters featuring stainless-steel floats and engraved linear scales.
Key Features
- Passive, power-free operation: No electrical connections, controllers, or solenoids—ideal for explosion-proof or EMI-sensitive environments.
- Dual independent flow paths: Each channel equipped with a high-precision SS304 needle valve and a calibrated 10–100 mL/min rotameter for real-time visual flow verification.
- Robust mechanical construction: All wetted parts fabricated from 304 stainless steel; optional PTFE tubing for enhanced chemical compatibility with corrosive or reactive gases (e.g., Cl₂, NH₃, H₂S).
- Integrated triple-pressure monitoring: Three front-mounted analog pressure gauges (−0.1 to 1.0 MPa, 0.01 MPa resolution) enable simultaneous observation of inlet pressures for both gases and mixed output pressure.
- Compact footprint and modular mounting: 340 mm × 300 mm × 180 mm chassis with pre-drilled panel-mounting holes; weighs only 6.35 kg for easy integration onto lab benches, furnace frames, or glovebox rear panels.
Sample Compatibility & Compliance
The CGM-2F is compatible with non-aggressive, non-particulate, and non-condensable gases including N₂, Ar, He, O₂, H₂, CO, CO₂, CH₄, and forming gas (N₂/H₂ mixtures). When configured with PTFE tubing, it supports limited exposure to mildly corrosive gases under dry, low-humidity conditions. While not certified to ISO 8573-1 for compressed air purity classes, its all-metal flow path and absence of elastomeric seals minimize outgassing and adsorption artifacts—supporting GLP-aligned documentation of gas delivery parameters in materials synthesis workflows. The system complies with general mechanical safety requirements per GB/T 150 (Chinese pressure vessel standard) for low-pressure instrumentation, and its pressure gauge calibration traceability aligns with JJG 52–2013 (Chinese national metrological verification regulation for pressure gauges).
Software & Data Management
The CGM-2F is a fully manual, analog instrument with no embedded firmware, digital interface, or data logging capability. Flow and pressure values are recorded manually by operators during experimental setup and process monitoring. This design intentionally avoids software validation burdens associated with FDA 21 CFR Part 11 compliance, making it appropriate for research-stage development, teaching laboratories, and internal method qualification where electronic audit trails are not mandated. Users integrating the CGM-2F into automated platforms may add external digital pressure transducers or mass flow controllers downstream—but such configurations fall outside the scope of factory calibration and warranty coverage.
Applications
- Controlled-atmosphere thermal processing: Precise delivery of reducing (H₂/N₂), oxidizing (O₂/N₂), or inert (Ar/He) blends into small-diameter quartz tube furnaces (≤50 mm OD) for sintering, annealing, or CVD precursor carrier gas modulation.
- Glovebox atmosphere conditioning: Continuous low-flow purging and composition adjustment within argon- or nitrogen-filled enclosures during electrode fabrication or air-sensitive catalyst handling.
- Plasma surface functionalization: Stable feeding of reactive gas mixtures (e.g., O₂/Ar, NH₃/He) into RF or microwave plasma cleaners to ensure repeatable surface energy modification.
- PECVD precursor dilution: Accurate metering of silane (SiH₄), ammonia (NH₃), or phosphine (PH₃) into carrier gas streams for thin-film deposition on substrates ≤4″ diameter.
- Calibration gas generation: On-demand preparation of reference mixtures for validating gas analyzers, residual gas analyzers (RGAs), or FTIR gas cells in metrology labs.
FAQ
Does the CGM-2F require electricity or compressed air to operate?
No. It functions entirely mechanically using inlet gas pressure to drive flow through calibrated needle valves and rotameters.
Can I use the CGM-2F with flammable gases such as hydrogen or silane?
Yes—provided appropriate engineering controls are in place (e.g., leak-tight fittings, ventilation, gas detectors) and PTFE tubing is selected for compatibility. Always consult SDS and conduct risk assessment prior to use.
What is the accuracy and repeatability of gas mixing with this system?
Accuracy depends on operator reading precision of rotameter scales (±5% full scale typical) and consistent valve positioning; repeatability is enhanced by using the same operator and standardized valve-turn protocol across experiments.
Is third-party calibration available for the rotameters or pressure gauges?
Yes—KJ GROUP offers optional NIST-traceable calibration certificates for both flowmeters and pressure gauges upon request, with documented uncertainty budgets per ISO/IEC 17025 requirements.
Can I retrofit digital flow sensors or automate control?
The base unit does not support retrofitting. However, KJ GROUP provides compatible standalone MFC modules (e.g., CGM-MFC-200 series) that can be plumbed in series for closed-loop digital control—subject to separate configuration and validation.
