Saprete SPT-NH Dedicated Nitrogen Generator for Gas Chromatography
| Brand | Saprete |
|---|---|
| Model | SPT-NH |
| Type | Membrane-Based Nitrogen Generator |
| Origin | Beijing, China |
| Manufacturer | Saprete (OEM/ODM Capable) |
| Output Flow | Configurable (Standard Ranges: 0–30 L/min, 0–50 L/min, 0–100 L/min) |
| Output Pressure | 0–0.7 MPa (adjustable, stable ±0.02 MPa) |
| Nitrogen Purity | ≥99.999% (v/v, O₂ < 1 ppm, H₂O < 0.1 ppm) |
| Dew Point | ≤ –65 °C (at 0.7 MPa) |
| Filtration Stages | 4-stage particulate & coalescing filtration (0.01 µm final stage) |
| Compressor | Integrated oil-free scroll compressor (imported, CE-certified) |
| Auto-Drying | Integrated membrane-based moisture separation with desiccant-assisted polishing |
| Control Interface | 4.3″ TFT touchscreen with real-time pressure/purity status, alarm logging, and RS-485/Modbus RTU output |
| Compliance | Meets ISO 8573-1:2010 Class 2:2:2 for compressed air quality |
Overview
The Saprete SPT-NH Dedicated Nitrogen Generator is an engineered solution designed specifically to supply high-purity, on-demand nitrogen gas for gas chromatography (GC) systems—including split/splitless injectors, detector make-up gas (e.g., for ECD, NPD), and carrier gas applications requiring stringent purity and stability. It employs a proven membrane separation principle: compressed air passes through asymmetric hollow-fiber polyimide membranes that exhibit differential permeability—oxygen, water vapor, and CO₂ permeate rapidly through the membrane walls, while nitrogen molecules are retained and collected as the enriched product stream. This physical separation process eliminates consumables such as PSA molecular sieves or cryogenic components, delivering continuous, maintenance-light operation with no moving parts in the separation module itself. The system integrates an oil-free scroll compressor, four-stage particulate and coalescing filtration (down to 0.01 µm), and a dual-stage moisture removal architecture combining membrane dehydration and desiccant polishing to achieve a certified dew point of ≤ –65 °C at operating pressure—ensuring condensation-free delivery even under ambient temperature fluctuations.
Key Features
- Immediate nitrogen generation upon startup—no warm-up or purge delay; ready for GC integration within 90 seconds
- Imported polyimide hollow-fiber membrane modules with >15,000-hour service life under continuous operation (verified per ISO 15136-1 accelerated aging protocols)
- Integrated oil-free scroll compressor meeting ISO 8573-1 Class 0 air quality standards for downstream purity integrity
- Four-stage filtration cascade: pre-filter (5 µm), coalescing filter (0.03 µm), activated carbon adsorber (for hydrocarbon removal), and final ultrafine particulate filter (0.01 µm)
- Real-time monitoring via 4.3″ industrial-grade TFT display showing inlet pressure, outlet pressure, flow rate, and system fault codes
- RS-485 serial interface with Modbus RTU protocol for seamless integration into laboratory building management systems (BMS) or GC vendor software (Agilent, Thermo Fisher, Shimadzu)
- Optional analog 4–20 mA output for remote pressure/flow telemetry and centralized lab gas monitoring platforms
Sample Compatibility & Compliance
The SPT-NH is validated for use with all major GC platforms requiring carrier gas meeting ASTM D6299 Annex A1 specifications (nitrogen purity ≥99.999%, O₂ ≤1 ppm, H₂O ≤0.1 ppm, hydrocarbons ≤0.1 ppm). Its output meets USP requirements for nitrogen used in pharmaceutical residual solvent analysis and complies with ISO/IEC 17025 accredited laboratories’ documented gas supply traceability needs. The unit’s internal log records operational hours, filter replacement timestamps, and pressure deviation events—supporting GLP/GMP audit readiness. All wetted materials (stainless steel 316L, EPDM seals, FDA-compliant tubing) conform to USP Class VI biocompatibility and EU Regulation (EC) No. 1935/2004 for food-contact safety.
Software & Data Management
While the SPT-NH operates autonomously without PC dependency, its embedded firmware supports data export via USB-C port (CSV format) containing timestamped pressure, flow, and alarm history over 30 days. Optional Saprete LabLink™ software (Windows/Linux) enables remote configuration, predictive filter life estimation based on runtime and differential pressure trends, and automated report generation compliant with 21 CFR Part 11 requirements—including electronic signatures, audit trails, and user role-based access control (admin/operator/viewer). Firmware updates are performed via signed .bin files with SHA-256 verification to ensure integrity.
Applications
- Carrier gas for capillary GC and GC-MS systems requiring ultra-high purity and zero baseline drift
- Make-up gas for electron capture detectors (ECD), nitrogen-phosphorus detectors (NPD), and thermal conductivity detectors (TCD)
- Blank gas for purge-and-trap and dynamic headspace sampling systems
- Instrument purge in FTIR and XRD sample chambers where oxygen-induced oxidation must be minimized
- Lab-scale inerting during sample preparation for oxidation-sensitive analytes (e.g., polyphenols, unsaturated lipids, metalloproteins)
FAQ
What is the recommended maintenance schedule for the SPT-NH?
Filter elements require replacement every 2,000–3,000 operating hours depending on ambient air quality; membrane modules are rated for ≥15,000 hours and do not require periodic replacement under normal conditions.
Can the SPT-NH be used with helium or hydrogen GC methods?
No—it is engineered exclusively for nitrogen generation; helium and hydrogen require dedicated generators based on PEM electrolysis or pressure swing adsorption.
Is external cooling required for continuous operation at maximum flow?
No—the integrated thermal management system maintains membrane surface temperature within optimal range (15–35 °C) across ambient conditions from 5–40 °C.
Does the unit support redundant operation with multiple GCs?
Yes—when configured with optional manifold kits and pressure-regulated distribution panels, a single SPT-NH can serve up to three GC systems with independent flow meters and isolation valves.
How is nitrogen purity verified during installation and routine qualification?
Saprete provides factory calibration certificates traceable to NIST standards; users may perform in-house verification using portable electrochemical O₂ analyzers (±0.01 ppm resolution) and chilled-mirror hygrometers calibrated to NPL standards.
