A PSA generator separates compressed air on a molecular sieve: under pressure the sieve holds the oxygen and lets the nitrogen through; on depressurisation it regenerates. Two columns alternate, and the gas flows continuously. The catalogue holds 67 nitrogen generators from 2 to 160 Nm³/h, up to 99.999% purity, and one oxygen generator of 50 Nm³/h.
The generator replaces cylinder or tank deliveries with production from the site's compressed air: no more ordering, no more pressurised cylinders to manage, no more dependence on a delivery round.
Purity is chosen by the application, never in excess: every extra nine costs air. Going from 99.5% to 99.999% multiplies the generator's compressed air consumption by 2 to 3, and therefore the size of the compressor upstream. Write down the maximum oxygen content the process tolerates, and size on it.
Three figures: the gas flow in Nm³/h, the purity, and the outlet pressure, from 6 to 10 bar in the catalogue. They decide the generator, then the compressor, dryer and filtration upstream, because a molecular sieve demands dry, oil-free air. The quote covers the whole chain, not the generator alone.
A steady consumption profile is what makes on-site production pay; a consumption in bursts is smoothed with a gas receiver.
A compressor sized on the generator's air demand at the chosen purity, a dryer, activated-carbon filtration, an air receiver upstream and a gas receiver downstream. All of it is in the catalogue and quoted together.
The one the process tolerates, written as a maximum oxygen content. Every extra nine costs air: from 99.5% to 99.999%, the generator's compressed air consumption is multiplied by 2 to 3.
It depends on the purity and the gas flow: the quote computes the compressor, dryer and filtration needed from those two figures. A molecular sieve demands dry, oil-free air.
The generator becomes the right choice as soon as consumption is steady: no more deliveries, no more pressurised cylinders, a gas produced on demand from the site's air. For rare or very small consumption, cylinders remain the simple route.
