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Dryers for Humidity Calibration Systems - PSD2 and PSD4

Updated:2025-03-13

Brand: PST/Michell
Model: PSD2 and PSD4
Description: The Michell PSD Series Pressure Swing Dryers use two columns filled with 4? molecular sieve desiccant, which are used alternately on a two-minute switching cycle. The PSD dryers are designed to operat
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Product Details

Dryers for Humidity Calibration Systems - PSD2 and PSD4 Description：

PSD2 Product Manual PSD4 Product Manual PSD2 and PSD4 Datasheet

Pressure Swing Drying Principle for Continuous Operation

Features

Excellent long-term stability

Maintenance free except for a desiccant change once every 5 years

Completely self-contained

Low power consumption

Pressure Swing dryers provide a source of very dry compressed air for use as a zero gas in humidity calibration systems, or for general laboratory applications.

The Michell PSD Series Pressure Swing Dryers use two columns filled with 4? molecular sieve desiccant, which are used alternately on a two-minute switching cycle. The PSD dryers are designed to operate continuously, using a small proportion of the dried air, to regenerate the offline column - generally giving desiccant life in excess of five years. This type of heatless regeneration also uses significantly less energy than a 'heated' type of dryer.

Specifications

Model	PSD2	PSD4 (Standard)	PSD4-HFV (High flow volume)	PSD4-HPO (High pressure output)
Performance
	Gas output
Flow	7 Nl/min (14.8 scfh)	30 Nl/min (63.6 scfh)	90 Nl/min (109.7 scfh)	30 Nl/min (63.6 scfh)
Pressure	4.8 barg (70 psig)			User-settable up 8 barg (116 psig)
Moisture content	<1ppm_v	<13.8ppb_v
Input Requirements
	Gas supply
Flow	10 Nl/min (21.2 scfh)	45 Nl/min (95.4 scfh)	105 Nl/min (222.5 scfh)	45 Nl/min (95.4 scfh)
Pressure	5...7 barg (70...100 psig)	6...10 barg (87...145 psig)
Moisture content	Oil and liquid water-free	<16ppm_v
Electrical Input
Power	100...115 OR 220...240 VAC, 50/60Hz	100...240VAC 50/60Hz
Power connection	IEC socket
Environmental Conditions
Operating temperature	+5...+35 °C (+41...+95 °F)	+10...+40 °C (+50...+104 °F)
Storage temperature	-40...+35 °C (-40...+95 °F)	-40...+50 °C (-40...+122 °F)
Mechanical Specifications
Type	Twin column desiccant, pressure swing
Desiccant	4 ?ngstr?m Molecular sieve bead (4-8 mesh)
Amount required (approx.)	2 Kg	3.5 Kg
Timer	Mechanical cam	Programmable relay
	Gas connections
Inlet	Swagelog ^® ?"	?" VCR Swagelok^® Tube
Outlet	Swagelog ^® ?"	?" VCR Swagelok^®	?" VCR Swagelok^®	?" VCR Swagelok^®
	Filters
Outlet	None	Millipore Wafergard IIF Micro Inline (sealed type) with PTFE membrane element rated at >99.999% retention of 0.003μm particles
Vent	None	Bonded glass microfiber rated at >99.999% retention of 0.1μm particles
Construction	Rack mount: 19" x 6U x 324mm (12.8")	304 stainless steel wall mounting enclosure: 800x600x300mm (31.5x24x12”)
Weight	12.5kg (27.5lbs)	30Kg (66lb)	35Kg (77lb)	32Kg (70lb)