PSA Nitrogen Generator

Thu, 05 Nov 2026 00:00:00 +0000

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.

Laser Support Equipment | Zhijie Laser | Handheld Laser Welder Manufacturer