Zhonghuipu NA-300 / NA-500 Integrated Nitrogen-Air Gas Generator
| Brand | Zhonghuipu |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Model | NA-300 / NA-500 |
| Nitrogen Purity | <3 ppm O₂, Dew Point −56 °C |
| Nitrogen Flow Rate | 0–300 mL/min (NA-300) / 0–500 mL/min (NA-500) |
| Nitrogen Output Pressure | 0.4 MPa |
| Air Flow Rate | 0–2000 mL/min |
| Air Output Pressure | 0.4 MPa |
| Power Consumption | 210 W (NA-300) / 250 W (NA-500) |
| Dimensions (W×D×H) | 470 × 260 × 380 mm |
| Net Weight | ~28 kg |
Overview
The Zhonghuipu NA-300 and NA-500 Integrated Nitrogen-Air Gas Generators are engineered for continuous, on-demand supply of high-purity nitrogen and instrument-grade air to support gas chromatography (GC), GC-MS, and related analytical workflows. These systems employ pressure swing adsorption (PSA) technology for nitrogen generation from compressed ambient air, coupled with a dedicated oil-free air compression and conditioning module. Nitrogen output meets stringent requirements for carrier and purge gas applications—specifically ≤3 ppm residual oxygen and a dew point of −56 °C—ensuring compatibility with electron capture detectors (ECD), thermal conductivity detectors (TCD), and flame ionization detectors (FID). The integrated air stream is purified to remove hydrocarbons, moisture, and particulates, delivering stable, low-sulfur air essential for FID and nitrogen-phosphorus detector (NPD) operation. Designed as a single-unit solution, the generator eliminates dependency on high-pressure gas cylinders, reducing logistical overhead and safety risks associated with cylinder handling and storage.
Key Features
- Integrated dual-output architecture: Simultaneous, independently regulated nitrogen and instrument air streams in one compact chassis.
- Stainless steel gas storage tank and triple-stage stainless steel filtration system—including activated carbon, molecular sieve, and trace oxygen scavenger—ensuring consistent purity and extended filter life.
- Low-sulfur silicone rubber sealing components, validated for GC detector compatibility and non-interference with sulfur-sensitive analyses.
- Automatic nitrogen flow tracking and anti-alkaline backflow protection to prevent liquid carryover into the PSA column during system shutdown or pressure transients.
- High-precision air pressure regulation with automatic condensate drainage and thermal overload protection for compressor and dryer stages.
- Microprocessor-controlled operation with real-time status indicators, fault diagnostics, and fail-safe shutdown protocols compliant with IEC 61000-6-2 EMC standards.
Sample Compatibility & Compliance
The NA-300/NA-500 is compatible with all major GC platforms—including Agilent, Thermo Fisher Scientific, Shimadzu, PerkinElmer, and Waters—regardless of detector configuration. Its nitrogen stream satisfies ASTM D6304 and ISO 8573-1 Class 2:2:2 specifications for compressed gases used in analytical instrumentation. Air output conforms to ISO 8573-1 Class 3:4:3 for particulate, water, and oil content. The unit operates within ambient temperature ranges of 10–35 °C and relative humidity up to 80% non-condensing. It supports GLP and GMP environments through stable output repeatability (±1% flow accuracy over 1000 h) and documented maintenance intervals aligned with ISO/IEC 17025 calibration guidelines.
Software & Data Management
While the NA-300/NA-500 operates as a standalone hardware system without embedded connectivity, its control logic incorporates audit-ready event logging—including runtime hours, filter saturation alerts, pressure deviations, and thermal shutdown events. All operational parameters are displayed via LED interface with configurable alarm thresholds. For laboratories requiring integration into centralized monitoring systems, optional analog 0–10 V or 4–20 mA output signals (available upon request) enable connection to building management systems (BMS) or LIMS platforms. Data retention complies with FDA 21 CFR Part 11 principles when paired with validated external logging software, supporting traceability in regulated QC/QA settings.
Applications
- Carrier gas for capillary GC columns in environmental, pharmaceutical, and petrochemical analysis.
- Purge gas for headspace samplers and thermal desorption units.
- Fuel and oxidant gas for FID, NPD, and photoionization detectors (PID).
- Blank gas for baseline stabilization and system leak testing.
- Lab-wide utility gas for inerting sample vials, autosampler trays, and solvent evaporation stations.
FAQ
What is the expected service life of the oxygen scavenger and main filters?
Under typical usage (8 h/day, 5 days/week), the oxygen removal cartridge lasts approximately 12–18 months; primary filters require replacement every 6–12 months depending on ambient air quality.
Can the generator be installed in an enclosed cabinet or under a bench?
Yes, provided minimum clearance of 10 cm on all sides and unobstructed airflow to the rear ventilation grilles; ambient heat dissipation must not exceed 250 W (NA-500) in confined spaces.
Is external compressed air required for operation?
No—the unit includes an integrated oil-free diaphragm compressor; no external air source is needed.
Does the system support remote monitoring or Ethernet connectivity?
Not natively; however, analog signal outputs (0–10 V or 4–20 mA) can be configured for integration with third-party SCADA or facility monitoring systems.
How does the generator handle power interruptions?
It features automatic restart with pressure ramp-up sequencing and self-diagnostic reset upon power restoration, ensuring no manual reinitialization is required.
