In SMT electronics manufacturing, nitrogen is widely used in reflow soldering and wave soldering to reduce oxidation and improve solder quality.
But many factories are asking:
Should we continue using liquid nitrogen, or switch to a PSA nitrogen generator?
This guide compares both solutions from the perspective of:
- Cost
- Stability
- ROI
- Maintenance
- SMT production efficiency
What Is Liquid Nitrogen?
Liquid nitrogen (LN2) is delivered by gas suppliers and stored in cryogenic tanks.
Advantages
- Very high purity
- Stable nitrogen quality
- Suitable for semiconductor applications
Disadvantages
- High monthly gas cost
- Delivery dependency
- Tank rental fees
- Evaporation loss
- Safety risks from ultra-low temperatures
For factories running multiple SMT lines, the long-term cost can become very expensive.
What Is a PSA Nitrogen Generator?
A PSA nitrogen generator produces nitrogen directly from compressed air inside the factory.
It is commonly used in:
- SMT production
- PCB assembly
- Reflow ovens
- Wave soldering
Typical purity:
- 99%
- 99.9%
- 99.99%
- 99.999%
Liquid Nitrogen vs PSA Nitrogen Generator
| Feature | Liquid Nitrogen | PSA Nitrogen Generator |
|---|---|---|
| Nitrogen Source | External supplier | On-site generation |
| Running Cost | High | Low |
| Supply Stability | Depends on supplier | Independent |
| Maintenance | Low | Low |
| ROI | None | 1–2 years |
| Safety | Cryogenic risk | Safer |
| Best For | Small usage | Medium & large SMT factories |
Why SMT Factories Prefer PSA Nitrogen Generators
Most SMT manufacturers are switching to PSA systems because they offer:
Lower Nitrogen Cost
No more:
- Gas refill charges
- Delivery fees
- Tank rental
Continuous Nitrogen Supply
Generate nitrogen 24/7 directly in the factory.
Better ROI
Many SMT factories reduce nitrogen costs by 40%–70%.
Easy Integration
PSA systems can connect directly to:
- Reflow ovens
- Wave soldering machines
- Selective soldering lines
Recommended Nitrogen Purity for SMT
| SMT Process | Recommended Purity |
|---|---|
| Standard Reflow | 99.9% |
| Lead-Free Soldering | 99.99% |
| Wave Soldering | 99.9% |
| Semiconductor Packaging | 99.999% |
Which Solution Is Better for SMT?
Liquid Nitrogen
Best for:
- Small workshops
- Low nitrogen usage
- Temporary production
PSA Nitrogen Generator
Best for:
- EMS factories
- PCB manufacturers
- Automotive electronics
- Large SMT production lines
- 24/7 production
For most electronics manufacturers, PSA nitrogen generators provide better long-term savings and production stability.
Conclusion
If your SMT factory uses nitrogen daily, a PSA nitrogen generator is usually the smarter investment.
Benefits include:
- Lower operating cost
- Stable nitrogen supply
- Faster ROI
- Reduced supplier dependency
- Improved SMT soldering quality
Looking for an SMT Nitrogen Generator?
Yuhan provides PSA nitrogen generators for:
- SMT production lines
- Reflow soldering
- Wave soldering
- PCB assembly factories
Contact us for:
- Free nitrogen solution design
- ROI analysis
- Customized nitrogen systems