Pressure Swing Dryers

 Dry Gas Generation using ‘Pressure Swing’ Principle
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.

Product Features

  • Ultra stable
  • Maintenance free
  • Two ranges: <1 ppm and < 10 ppb
Pressure Swing Dryers

Technical Specification
PSD-2
Type Twin column desiccant, pressure swing
Desiccant 4 Angstrom Molecular sieve bead
Timer Motorised cam
Gauges Bourdon type
Exhausts Sintered bronze silencers
Gas Inlet 10 Nl/min at 70 to 100 p.s.i.g.; oil free and liquid water free
Gas Outlet 7 Nl/min (max) at stp less than 1 ppmV (= less than -75°C dew point); outlet pressure 10 p.s.i.g.
Power Supply 100/120 or 220/240 VAC, 50/60 Hz
Operating Temperature +5 to +35°C
Storage Temperature -40 to +35°C
Construction Aluminium case, 19” sub-rack 6U x 350mm deep
Weight 12.5kg approx
PSD-4
Type Twin column desiccant, pressure swing
Desiccant 4 Angstrom Molecular sieve bead
Timer Motorised cam
Gas Ports Gas inlet-stainless steel 6mm Swagelok® bulkhead union tube fitting
Gas outlet-stainless steel ¼” Swagelok® bulkhead union VCR fitting
Gas Inlet 20 Nl/min at 70 to 100 p.s.i.g.; oil free and liquid water free (better or equal to -40°C dew point)
Gas Outlet 10 Nl/min (max) at stp less than 13 ppbV (-100°C dew point)
Filter Millipore Wafergard IIF Micro Inline, sealed type, retention rating of 0.003 µm, greater than 99.999%
Power 220/240 VAC, 50/60 Hz
Operating Temperature +10 to +40°C
Storage Temperature -40 to +50°C
Construction IP66 (NEMA 4) GRP wall mounting enclosure (700 x 500 x 270mm); all gas wetted components 316 stainless steel
Weight 27kg approx

Applications
Metrology

Related Products
DCS DCS
The DCS is a dew-point calibration system designed for the calibration, verification and...
DG-1, DG-2, DG-3, DG-4 and VDS DG-1, DG-2, DG-3, DG-4 and VDS
A range of humidity and dew-point generators offering ease of use, fast response for humidity...
S4000 RS and TRS S4000 RS and TRS
The precision S4000 Cooled Mirror Dew-point hygrometers offer unmatched accuracy and reliability in dew...
S8000 Integrale S8000 Integrale
The new S8000 Integrale continues Michell’s tradition of excellence in the design of high...
Optidew Vision Optidew Vision
The Optidew Vision precision dew-point meter is based on the proven, fundamental optical dew...
Optidew Optidew
The Optidew high performance optical dew-point transmitter is based on the proven, fundamental...