AYAN-250LB Pressure Swing Adsorption (PSA) Nitrogen Generator
| Brand | AYAN Instruments |
|---|---|
| Origin | Zhejiang, China |
| Model | AYAN-250LB |
| Nitrogen Production Principle | Pressure Swing Adsorption (PSA) |
| Output Flow Rate | 250 L/min |
| Output Pressure Range | 0–0.6 MPa |
| Nitrogen Purity | 99% |
| Dew Point | −40 °C |
Overview
The AYAN-250LB Pressure Swing Adsorption (PSA) Nitrogen Generator is an integrated on-site nitrogen supply system engineered for laboratory and light industrial applications requiring continuous, reliable, and oil-free nitrogen gas at moderate purity and flow. It operates on the well-established PSA principle—leveraging the differential adsorption kinetics of oxygen and nitrogen on carbon molecular sieve (CMS) under varying pressure conditions. Compressed air—pre-treated for particulates, moisture, and hydrocarbon contaminants—is introduced into dual-bed CMS columns. During high-pressure adsorption (typically 0.6–0.8 MPa), oxygen, CO₂, and water vapor are preferentially retained by the CMS, while nitrogen passes through with minimal retention. When pressure is reduced (desorption phase), the adsorbed components are purged, regenerating the CMS bed. This cyclic, fully automated process delivers stable nitrogen output without cryogenic cooling or membrane degradation concerns.
Key Features
- Integrated air preparation train: Includes built-in oil-lubricated air compressor, refrigerated air dryer, coalescing and activated carbon filtration stages, and micro-oil adsorption units to ensure CMS protection and long-term adsorbent integrity.
- Self-contained nitrogen conditioning: Equipped with real-time nitrogen purity analyzer (electrochemical O₂ sensor), mass flow meter, pressure-regulated nitrogen buffer tank, and automatic venting control for off-spec gas—ensuring only compliant nitrogen enters the storage or process line.
- Robust mechanical design: Heavy-duty chassis with load-bearing casters and locking brakes enables safe relocation within lab or pilot-scale facilities without compromising structural stability or alignment integrity.
- Staged pressure stabilization: Dual buffering—air buffer tank upstream of CMS beds and nitrogen buffer tank downstream—minimizes pulsation, dampens pressure transients, improves CMS bed utilization efficiency, and enhances long-term system reliability.
- Optimized CMS selection support: Backed by technical collaboration with global CMS manufacturers, enabling application-specific adsorbent grading (e.g., high-capacity vs. high-selectivity variants) to balance energy consumption, lifetime, and purity consistency.
Sample Compatibility & Compliance
The AYAN-250LB is compatible with ambient air as feedstock and requires no external gas cylinders or liquid nitrogen infrastructure. Its output meets ISO 8573-1:2010 Class 2.2.1 (solid particles ≤ 0.1 µm, dew point ≤ −40 °C, total oil ≤ 0.01 mg/m³) when operated within specified inlet air quality limits (ISO 8573-1 Class 4 or better). While not certified to FDA 21 CFR Part 11 or EU Annex 11 out-of-the-box, its analog sensors, manual calibration records, and non-networked architecture allow integration into GLP-compliant workflows where audit trails are maintained externally. For food-grade applications requiring ≥99.9% N₂ purity, optional post-purification modules (e.g., catalytic oxygen scavengers) may be deployed in series.
Software & Data Management
The unit features a local HMI panel with LED indicators for operational status, real-time display of nitrogen purity (% N₂), volumetric flow (L/min), outlet pressure (MPa), and dew point (°C). All parameters are logged internally at 1-minute intervals for up to 30 days; data export is supported via USB interface in CSV format. No cloud connectivity or remote monitoring is implemented—ensuring data sovereignty and eliminating cybersecurity exposure vectors common in IoT-enabled gas generators. Calibration procedures follow traceable protocols aligned with ISO/IEC 17025 guidelines for in-house verification of sensor accuracy.
Applications
This generator serves laboratories and pilot plants engaged in inert blanketing of sensitive reactions (e.g., Grignard, organolithium, or metal-catalyzed hydrogenations), GC carrier gas supply (where 99% purity suffices for non-quantitative screening), sample preservation under nitrogen purge (e.g., chromatography vials, hygroscopic standards), and packaging atmosphere control for analytical reference materials. It is also deployed in food R&D settings for modified atmosphere packaging (MAP) feasibility studies—though final production-scale food-grade nitrogen must meet higher purity specifications (≥99.9%) per ISO 8573-1 and Codex Alimentarius standards.
FAQ
What is the recommended inlet air quality for optimal CMS life?
ISO 8573-1 Class 4 (≤5 µm particles, dew point ≤ +3 °C, oil content ≤ 5 mg/m³) is advised. Failure to meet this may accelerate CMS fouling and reduce cycle efficiency.
Can the output pressure be regulated independently of flow demand?
Yes—the integrated pressure regulator maintains setpoint stability across 0–0.6 MPa, independent of downstream flow fluctuations, provided inlet air pressure remains ≥0.7 MPa.
Is routine CMS replacement required, and what is its typical service life?
Under proper pretreatment and operation, CMS retains >90% adsorption capacity for ≥30,000 hours (≈3.4 years of continuous use); replacement intervals depend on inlet air contamination history and are verified via purity decay trend analysis.
Does the system support integration with building management systems (BMS)?
No native Modbus or BACnet interface is included; however, dry-contact alarm outputs (e.g., low purity, high dew point) are available for hardwired connection to external supervisory logic.
How does ambient temperature affect performance?
Output flow and purity remain stable between 5–40 °C; below 5 °C, refrigerated dryer efficiency declines, risking liquid water ingress—installation in climate-controlled environments is recommended.
