Michell Instruments PSD2, PSD4 Specifications

Calibration Instruments

Pressure Swing Dryers

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.

PSD2 & PSD4

Pressure Swing Dryers

Air Source Dryer

Humidity generator

Reference

The Michell PSD Series Pressure Swing Dryers use two columns ﬁ lled with 4Å molecular sieve desiccant, which are used alternately on a switching cycle. The PSD dryers are designed to operate continuously, using a small proportion of the dried air to regenerate the ofﬂ ine column - generally giving desiccant life in excess of ﬁ ve years. This type of heatless regeneration uses signiﬁ cantly less energy than a 'heated' dryer.

The PSD2 is ﬁ tted with inlet and outlet pressure regulation, and delivers up to 7 Nl/min (14.8 scfh) of dry air with a moisture content of 1 ppmV or better.

The PSD4 is supplied with stainless steel internals and larger volume desiccant columns. These factors, combined with high integrity VCR couplings deliver an output of up to 90 Nl/min (optional) with a moisture content better than 14 ppbV.

Issue No: PSD2 and PSD4_97160_V4.1_US_0918 Please note: Michell Instruments adopts a continuous development program which sometimes

necessitates speciﬁ cation changes without notice. Please contact us for latest version.

Highlights

• Excellent long term stability

• Maintenance free except for a desiccant change

• Completely self-contained

• Low power consumption

once every 5 years

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Technical Speciﬁ cations

Calibration Instruments

Pressure Swing Dryers

Model PSD2 PSD4-STD

(Standard)

PSD4-HFV

(High ﬂ ow 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 0.5 barg (7 psig) User-settable up 8 barg (116 psig) Moisture content <1ppm

<13.8 ppb

Input Requirements

Gas supply

Flow 10 Nl/min (21.2 scfh) 30 Nl/min (63.6 scfh) 90 Nl/min (109.7 scfh) 30 Nl/min (63.6 scfh) Pressure 5 to 7 barg (70 to 100 psig) 6 to 10 barg (87 to 145 psig) Moisture content Oil and liquid water-free <16ppm

Electrical Input

Power 100 to 115 OR 220 to 240

VAC, 50/60Hz

Power Connection IEC socket

100 to 240VAC 50/60Hz

Environmental Conditions

Operating temperature +5 to +35°C (+41 to +95°F) +10 to +40°C (+50 to +104°F) Storage temperature -40 to +35°C (-40 to +95°F) -40 to +50°C (-40 to +122°F)

Mechanical Speciﬁ cations

Type Twin column desiccant, pressure swing Desiccant 4 Ångström Molecular sieve bead (4-8 mesh) Amount required (approx.) 2 kg 3.5 kg Timer Mechanical cam Programmable relay

Gas connections

Inlet Swagelok® ¼" ¼" VCR Swagelok Outlet Swagelok® ¼" ¼" VCR Swagelok

Outlet None Millipore Wafergard IIF Micro Inline (sealed type) with PTFE membrane element rated at >99.999%

Vent None Bonded glass microﬁ ber rated at >99.999% retention of 0.1μm particles Construction Rack mount: 19" x 6U x

324mm (12.8")

Weight 12.5kg (27.5lbs) 30Kg (66lb) 35Kg (77lb) 32Kg (70lb)

304 stainless steel wall mounting enclosure: 800x600x300mm (31.5x24x12”)

Dimensions - PSD2

300mm 12"

½" VCR Swagelok

Filters

retention of 0.003μm particles

Dimensions - PSD4

482mm

600mm 24" 555mm 22"

¼" VCR Swagelok

266mm

800mm 31"

845mm 33"

440mm

Depth: 324mm

Please note: Michell Instruments adopts a continuous development program which sometimes necessitates speciﬁ cation changes without notice. Please contact us for latest version.

Front View