PSA Nitrogen Generator
Product Overview
The PSA (Pressure Swing Adsorption) nitrogen generator uses clean compressed air as its feedstock. Carbon molecular sieves adsorb oxygen and carbon dioxide under high pressure and desorb them at low pressure, separating nitrogen on site for immediate use — no cylinder handling, no liquid nitrogen delivery, and no evaporation loss. It is widely used for laser welding shielding, laser cutting assist gas, metal heat treatment, and food preservation.
Key Advantages
- Generate gas on site, on demand — Cut out bottled and liquid nitrogen suppliers entirely; produce gas the moment you start the unit
- Adjustable purity — Nitrogen purity from 95% to 99.999% in multiple grades to match different welding/cutting processes
- Stable, self-regulating purity — Intelligent closed-loop control keeps flow and purity steady for consistent shielding quality
- Low running cost — Cost per cubic meter is only 30%–50% of bottled/liquid nitrogen, so units pay for themselves quickly
- Safe and convenient — Low pressure, ambient temperature operation; no high-pressure cylinders or cryogenic liquid
- Saves labor and floor space — No cylinder swapping, compact footprint that sits right next to your production line
- Smart touch control — Chinese LCD touchscreen showing real-time purity, flow, pressure and fault alarms
Technical Specifications
| Item | Specification |
|---|---|
| Model | ZJ-PSA-10 |
| Principle | Pressure Swing Adsorption (PSA) carbon molecular sieve |
| Nitrogen purity | 95% – 99.999% (settable) |
| Flow capacity | 5 – 200 Nm³/h (by model) |
| Output pressure | 0.4 – 1.0 MPa (adjustable) |
| Dew point | ≤ -40℃ |
| Feed requirement | Clean dry compressed air, 0.6 – 1.0 MPa |
| Residual oxygen | ≤ 0.01% – 5% (matching grade) |
| Control | PLC + LCD touchscreen |
| Power supply | AC 380V / 50Hz three-phase |
| Ambient temperature | 5 – 45℃ |
| Installation | Skid-mounted, plug-and-play |
| Noise | ≤ 75 dB |
Advantages in Laser Welding Applications
The quality of the shielding gas (nitrogen) directly affects weld formation and cutting edge finish. On-site generation gives laser systems these unique benefits:
1. Stable gas flow, more consistent welds
- Immediate on-site production keeps pressure and flow steady, giving uniform shielding at the nozzle and low-oxidation, consistent weld color
- Avoids weld defects and spatter caused by pressure swings during cylinder changes
2. Controllable purity for multiple materials
- When welding stainless steel, galvanized steel or aluminum, adjust the purity grade to precisely match the shielding requirement of each material
- For cutting carbon steel or stainless steel, select the right purity for each plate thickness for cleaner edges
3. Integrated with laser lines, zero downtime
- Gas production matches consumption in real time with no gaps, ideal for long continuous welding/cutting runs
- One nitrogen system can serve multiple welders via centralized supply for maximum utilization
4. Batch consistency and easy scaling
- Fully automated quality monitoring ensures consistent gas quality across production batches
- Expand your line without renegotiating suppliers — just add capacity modules
Cost Comparison vs Traditional Supply
| Aspect | Bottled Nitrogen | Liquid Nitrogen | On-site Generation (this unit) |
|---|---|---|---|
| Supply mode | Ordering & swapping | Tanker delivery | Produced on site in real time |
| Logistics & handling | Frequent cylinder swaps | Delivery + evaporation loss | No delivery, no handling |
| Cost per m³ | High | Medium-high | Low (about 30%–50%) |
| Supply risk | Downtime during swaps | Delivery delays | No interruption |
| Storage safety | High-pressure cylinder | Cryogenic burn/vapor risk | Low pressure, room temp — safest |
| Floor space | Cylinder storage area | Storage tank + vaporizer | Minimal, next to the line |
| Purity control | Fixed grade | Fixed grade | Multiple adjustable grades |
| Ongoing cost | Rental deposits | Tank leasing | Only specialty filter media |
Payback reference: For continuous daily use at moderate consumption, on-site generation typically recovers the equipment investment within 6–12 months through gas cost savings, after which savings continue.
Typical Applications
- Shielding gas for laser welding / laser cutting
- Nitrogen shielding for stainless steel, galvanized steel and aluminum welding
- Heat treatment and annealing atmosphere for metals
- Inert shielding for float glass and electronic components
- Nitrogen food preservation and storage
- Purging and inerting of chemical tanks and pipelines
Standard Configuration
| Item | Qty |
|---|---|
| PSA nitrogen generator main unit | 1 |
| Refrigerated air dryer | 1 |
| High-efficiency filters (1μm, 0.1μm, oil-removal) | 1 set |
| Activated carbon filter | 1 |
| Oxygen analyzer | 1 |
| Buffer receiver tank | 1 |
| Intelligent control cabinet (PLC + touchscreen) | 1 |
| Electric heater regeneration unit | 1 |
| Nitrogen pressure reducing valve set | 1 |
| Installation & commissioning toolkit | 1 set |
| Operation & maintenance manual | 1 set |
FAQ
Is on-site generation cheaper than buying liquid nitrogen?
Low consumption with short hours might favor purchasing, but laser welding/cutting usually means steady, long-term use. On-site generation costs only 30%–50% per cubic meter, and eliminates cylinder deposits, deliveries and waiting — winning on both total cost and production efficiency.
What installation conditions are required?
You need 380V three-phase power, a 0.6–1.0 MPa clean compressed air source (or we supply a matching compressor), and a 5–45℃ ventilated area. The unit is skid-mounted and plug-and-play on arrival.
Are purity and flow guaranteed to be stable?
Yes. The PLC closed-loop control with inline oxygen analysis monitors continuously, and auto alarms activate on out-of-range concentration or flow, so the output always meets the process requirement.
Will one unit cover multiple welders?
Yes. Size the generator by total gas demand to centralize supply across several laser welders/cutters, and add matching modules when scaling your line.
What is the warranty?
- Main unit: 12 months from shipment
- Core components (carbon molecular sieves, etc.): per manufacturer standard
- Consumables (filter elements, seals): 3 months
Request a Quote
Need on-site nitrogen to replace bottled/liquid gas? Tell us your consumption, purity requirement and number of production lines, and we will design your nitrogen generation system.
