RUNRONG INSTRUMENT N-UZ PSA Nitrogen Generator for GC Applications

Overview

The RUNRONG INSTRUMENT N-UZ is a compact, benchtop nitrogen generator engineered specifically for gas chromatography (GC) systems requiring high-purity, continuous nitrogen supply as carrier gas, make-up gas, or detector gas (e.g., for ECD, NPD, or as auxiliary gas in MS interfaces). It employs a dual-bed Pressure Swing Adsorption (PSA) system with carbon molecular sieves (CMS), coupled with multi-stage purification—including catalytic oxygen removal, deep desiccation, and sub-micron particulate filtration—to achieve stable 6N+ nitrogen purity (≥99.99999% v/v, <0.1 ppm O₂, <0.1 ppm H₂O, <0.01 ppm total hydrocarbons). Unlike membrane-based generators, the PSA architecture ensures consistent purity across the full flow range and maintains performance under variable demand—critical for retention time stability and baseline integrity in quantitative GC analysis.

Key Features

• Stable 6N+ nitrogen output (≥99.99999% purity) validated per ISO 8573-1:2010 Class 1 compressed air quality standards for gaseous contaminants
• Adjustable flow control from 0 to 800 mL/min via precision mass flow valve, enabling precise matching to GC method requirements
• Maximum delivery pressure of 0.6 MPa (6 bar), sufficient to support multiple GC instruments simultaneously—even at distances up to 30 meters via 1/4″ SS tubing
• Integrated 3.5-inch LCD interface with real-time display of flow rate, outlet pressure, sieve bed status, and maintenance alerts
• Modular PSA design with automatic cyclic regeneration; no consumables beyond standard CMS replacement every 24–36 months under typical lab usage
• Low-noise operation (<55 dB(A)) and minimal footprint (W320 × D350 × H420 mm) suitable for crowded analytical labs or GC instrument carts

Sample Compatibility & Compliance

The N-UZ is compatible with all major GC platforms—including Shimadzu GC-2010/2030, Agilent 7890/8890, Thermo ISQ/Trace 1300 series—and supports both split/splitless injectors and capillary columns requiring ultra-high-purity carrier gas. Its output meets ASTM D6352-21 specifications for nitrogen used in hydrocarbon analysis and satisfies USP and EP 2.5.27 requirements for inert gases in pharmaceutical residual solvent testing. The unit complies with IEC 61010-1:2010 for laboratory electrical safety and includes built-in overpressure relief, thermal cutoff, and leak detection logic. Audit trails and user-access logs can be exported via USB for GLP/GMP environments adhering to FDA 21 CFR Part 11 principles.

Software & Data Management

While the N-UZ operates autonomously via front-panel controls, optional RS-232 or Ethernet connectivity enables integration into centralized lab infrastructure. A dedicated PC utility (Windows/Linux compatible) provides remote monitoring of operational parameters, historical flow/pressure trends, CMS saturation estimation, and scheduled maintenance reminders. All data logs are timestamped and digitally signed to support traceability requirements. Configuration changes require dual-level password authentication, and firmware updates follow secure signed-package protocols compliant with ISO/IEC 17025 Clause 5.9.4.

Applications

• Carrier gas for capillary GC and GC-MS systems where oxygen and moisture contamination cause column degradation or detector noise
• Make-up gas for electron capture detectors (ECD) and nitrogen phosphorus detectors (NPD) demanding sub-ppm impurity levels
• Inert blanketing during sample preparation (e.g., headspace vial sealing, solvent evaporation under nitrogen stream)
• Zero-air generation support when paired with catalytic purifiers for FTIR or UV-Vis purge applications
• Backup or primary nitrogen source for QA/QC labs seeking independence from liquid nitrogen dewars or high-pressure cylinders

FAQ

Does the N-UZ require an external air compressor?
Yes. It must be connected to a clean, oil-free compressed air source meeting ISO 8573-1 Class 2:2:2 (≤0.1 µm particles, ≤0.1 mg/m³ oil aerosol, ≤−40 °C dew point).

How often does the CMS require replacement?
Under typical GC usage (8 h/day, 5 days/week), CMS life is 24–36 months. The unit monitors bed efficiency and displays replacement prompts 30 days in advance.

Can it supply two GC systems simultaneously?
Yes—provided combined flow demand remains within 800 mL/min and total line length + fittings maintain pressure drop below 0.1 MPa at operating flow.

Is the nitrogen purity verified in real time?
No built-in online analyser is included; however, factory calibration certificates (traceable to NIST standards) are supplied, and optional third-party electrochemical O₂/H₂O sensors can be integrated via analog 4–20 mA outputs.

What safety certifications does the unit hold?
It carries CE marking per EU Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU, and conforms to RoHS 2011/65/EU and REACH SVHC regulations.