Jiayuan NA-300 Nitrogen-Air Combined Gas Generator

Overview

The Jiayuan NA-300 Nitrogen-Air Combined Gas Generator is an integrated on-site gas supply system engineered for laboratories requiring stable, high-purity nitrogen and instrument-grade compressed air from a single compact unit. It employs pressure swing adsorption (PSA) technology with dual-bed molecular sieve separation to generate nitrogen from ambient air, while simultaneously conditioning and delivering clean, oil-free, dried compressed air via a multi-stage filtration and pressure-regulation architecture. Unlike cylinder-based supply systems, the NA-300 eliminates logistical constraints, safety hazards associated with high-pressure gas storage, and batch-to-batch purity variability—delivering consistent 99.999% nitrogen (O₂ < 3 ppm, dew point −56 °C) and particle- and hydrocarbon-free air suitable for sensitive analytical instrumentation including gas chromatographs (GC), liquid chromatography–mass spectrometers (LC-MS), and elemental analyzers.

Key Features

• Intelligent flow-tracking control: Automatically adjusts nitrogen generation output in real time to match downstream demand—minimizing energy consumption and extending sieve life.
• Integrated anti-liquid-backflow protection: Patented automatic liquid detection and cutoff mechanism prevents condensate ingress into PSA beds or air compression stages, ensuring long-term operational integrity and reducing unscheduled maintenance.
• Dual independent output regulation: Separate precision pressure regulators and mass flow controllers for nitrogen and air streams enable simultaneous, stable delivery at user-defined setpoints (0–0.4 MPa for both gases).
• Low-noise operation: Acoustically optimized compressor and vibration-dampened internal layout achieve < 40 dB(A) at 1 m—compatible with shared laboratory environments and ISO 14644-compliant cleanroom-adjacent installations.
• Compact footprint and plug-and-play deployment: Self-contained design (500 × 300 × 380 mm, 20 kg) requires only standard AC 220 V power and ambient air intake—no external cooling water or exhaust ducting needed.

Sample Compatibility & Compliance

The NA-300 delivers gases meeting stringent requirements for analytical instrumentation across regulated and research settings. Nitrogen output complies with ASTM D6866-22 (for isotopic purity traceability in GC carrier gas applications) and ISO 8573-1:2010 Class 1.2.1 (compressed air quality for instrumentation). Its dew point of −56 °C satisfies USP and EP 2.2.42 specifications for dry gas used in thermal desorption and purge-and-trap systems. The unit’s construction adheres to IEC 61010-1:2010 for electrical safety in laboratory equipment. While not certified to FDA 21 CFR Part 11 out-of-the-box, its operational logs and pressure/flow event timestamps are exportable for inclusion in GLP/GMP audit trails when integrated with validated LIMS or instrument control software.

Software & Data Management

The NA-300 operates as a standalone hardware platform without embedded firmware-based data logging or remote connectivity. All operational parameters—including real-time nitrogen and air pressure, flow rate, system temperature, and alarm status—are displayed on a front-panel LCD interface with tactile navigation buttons. Critical events (e.g., liquid detection activation, filter saturation warning, or pressure deviation >±5% of setpoint) trigger visual indicators and latching relay outputs compatible with building management systems (BMS) or lab-wide alarm networks. For compliance-driven environments, users may connect optional analog 4–20 mA output modules (sold separately) to record continuous pressure/flow signals in SCADA or historian databases. Firmware updates—when released for performance optimization or diagnostic enhancement—are performed locally via USB interface under technician supervision.

Applications

• Carrier and make-up gas for capillary GC and GC–MS systems requiring ultra-high-purity nitrogen with minimal oxygen and moisture interference.
• Zero-air source for flame ionization detectors (FID), electron capture detectors (ECD), and chemiluminescence NO_x analyzers.
• Instrument air for pneumatic actuators, autosampler valves, and detector cooling systems in HPLC, IC, and ICP-OES platforms.
• Blank gas in environmental air monitoring labs performing EPA Method TO-14/TO-15 sampling and analysis.
• Process gas in materials science labs conducting controlled-atmosphere thermal gravimetric analysis (TGA) or differential scanning calorimetry (DSC).

FAQ

What is the expected service life of the molecular sieve beds?
Under typical laboratory usage (8 h/day, 5 days/week), PSA beds maintain ≥99.999% nitrogen purity for ≥15,000 operating hours before scheduled replacement—verified via periodic O₂ analyzer validation per ISO 8573-6.

Can the NA-300 be used in conjunction with a hydrogen generator for GC-FID applications?
Yes—the NA-300’s air stream meets FID combustion air specifications (hydrocarbon-free, dew point < −40 °C), and its nitrogen output is fully compatible as make-up or carrier gas. It is commonly deployed alongside Jiayuan HG-series hydrogen generators in dual-gas GC configurations.

Is external drying or filtration required upstream of the NA-300?
No—the unit incorporates an integrated pre-filter assembly (particulate + coalescing + activated carbon) that conditions ambient intake air to ISO 8573-1 Class 4.2.3 standards; installation in environments with ambient humidity ≤85% RH is sufficient.

Does the NA-300 support continuous 24/7 operation?
Yes—designed for unattended duty cycles, it features thermal overload protection, auto-restart after power interruption, and failsafe pressure relief valves compliant with PED 2014/68/EU.