Oxygen and PSA
What purity is PSA oxygen, and is it medical grade?
Short answer
Single-stage PSA plants such as ULTRAOX produce Oxygen 93, a medical oxygen with its own monographs in the European Pharmacopoeia (Oxygen (93 per cent), 2455) and the US Pharmacopeia (Oxygen 93 Percent).
It contains 90.0% to 96.0% oxygen by volume, the rest mostly argon and nitrogen. ULTRAOX SC and ST plants deliver 94% (±1%) oxygen to European Pharmacopoeia quality; their datasheets give residual contents at initial operation of CO2 below 300 ppm, CO below 5 ppm and a working dew point of −46 °C. Oxygen made by cryogenic distillation, delivered as liquid or in cylinders, follows a different monograph, Oxygen (0417), at 99.5% or more.
Sources
- Ultra Controlo, Medical gas answers: EDQM, Ph. Eur. monographs 0417 and 2455; USP, Oxygen 93 Percent; ULTRAOX SC and ST datasheets.
- European Pharmacopoeia (EDQM)
- USP-NF, Oxygen 93 Percent
Ultra Controlo figures come from its technical datasheets. Third-party facts were read at the source on the date shown.
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