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The PSD-Series is designed specifically for calibration applications. It utilises two desiccant columns of molecular sieve and operates on the 'pressure-swing' principle. The columns are used alternately and a small quantity of dry air is bled from the in-service column to re-generate the line column. Moisture is absorbed at elevated pressure whilst re-generation occurs at atmospheric pressure, hence the term 'pressure-swing'. The columns are automatically switched on a two minute cycle. The PSD-2 dryer operates continuously and desiccant life is normally in excess of five years. Using oil-free compressed air at 7 barg the PSD-2 delivers up to 10 Nl/min of air at a dew point of better than -75°C.