PSA Nitrogen Generator 99.99–99.999% Purity

This PSA nitrogen generator produces nitrogen at 99.99–99.999% purity using carbon molecular sieve (CMS) in a twin-tower pressure swing adsorption system, with residual oxygen below 10 ppm.

Flow ranges from 1 to 2000 Nm³/h with outlet pressure from 0.1 to 1.0 MPa, and the towers alternate between adsorption and regeneration so the supply is continuous.

Ultra-low oxygen makes it suitable for sensitive electronics and metal processing, where even a small oxygen content causes oxidation, dross or poor wetting.

It is used for SMT wave soldering, laser cutting assist gas, electronics assembly and metal heat treatment.

The PSA nitrogen range is published as a purity and capacity configuration rather than a numbered model table: fix the purity tier first, then the flow, outlet pressure and dew point for the duty.

• Adsorption towers: two adsorber vessels alternate between adsorption and regeneration, so the nitrogen supply is continuous.
• Molecular sieve: carbon molecular sieve (CMS) retains oxygen at pressure while nitrogen passes through as product gas; when a bed approaches saturation it is depressurised and the captured oxygen is vented.
• Air dryer: the package includes an air dryer that brings the compressed-air moisture load down so the feed-air dew point requirement is met before the air reaches the sieve bed.
• Filtration: filtration stages remove oil aerosol and dust carried over from the compressor and receiver, protecting the sieve bed.
• Air receiver: a buffer tank (air receiver) between the compressor and the PSA towers steadies the feed-air supply.
• Control cabinet: PLC automatic control with an optional HMI touch screen; the control cabinet manages the valve cycle and the operating parameters.
• Purity monitoring: an oxygen analyser monitors residual oxygen in the product nitrogen, and its calibration is checked on schedule.
• Feed air: clean compressed air at 0.6–0.8 MPa with a dew point of -40°C or lower, oil-free.

• SMT wave soldering: supplies low-oxygen nitrogen for SMT wave soldering to reduce oxidation.
• Laser cutting assist gas: provides nitrogen as assist gas for laser cutting of stainless steel and aluminium.
• Electronics assembly: protects electronics assembly and reflow processes from oxidation.
• Metal heat treatment: inerts heat-treatment and annealing furnaces to reduce oxidation and scale.
• Brazing and sintering: covers furnace atmospheres for brazing and sintering duties.
• Semiconductor preparation: supports process steps that need a very low residual oxygen level.

• Confirm the residual oxygen requirement first, because the generator publishes below 10 ppm and that figure drives the sieve charge and the flow.
• Check the flow and outlet pressure against the 1 to 2000 Nm³/h and 0.1 to 1.0 MPa ranges.
• Specify the feed-air quality precisely — oil-free, with a dew point of -40°C or lower — because it directly limits the achievable purity.
• Confirm whether the duty is continuous or intermittent, since purity recovers to the rated level within 30 minutes of start-up.
• State the power supply and installation conditions, and allow space for the dryer, filtration and air receiver.
• Plan a liquid-nitrogen backup if an interruption to the assist gas would stop the line.