DG-2, DG-3, DG-4, DG-5 and VDS Humidity Generators

Brand: Michell Instruments

Tags: DG-2, DG-3, DG-4, DG-5, and, VDS, Humidity, Generators, Michell, Instruments

The Michell range of dew-point generators provides flexibility and control at a competitive price. Based on the volumetric mixing of dry and wet gases, the instruments can be controlled either manually or automatically to suit a wide range of calibration applications.

For a complete dew-point calibration system with optional compressor, dryer, dew-point generator and cooled mirror reference instrument refer to DCS System page.

Product Features

Manual selection, push button or computer control of generated dew point
-100 to +20°C dew-point range capability, depending on model
Precision flowmeter or mass flow controller operation
High stability and repeatability
Fast response to changes in set-point

DG3

The DG3 is our entry-level, single-stage mixing humidity generator. It is operated by manually mixing the two gas streams using flow control valves. The DG3 provides flows up to 5 Nl/min (10.6 scfh) and generates dew points ranging from -40 to +20°Cdp (-40 to +68°Fdp).

DG2

The DG2 has two stages of gas-flow mixing which allow it to generate dew points down to -75°Cdp (-103°Fdp). The great strengths of the DG2 are its ease of use and its flexibility in manually generating an accurate target dew point by fine tuning the gas mix via its flow metering valves. Infinite mixing is achievable within its working range.

DG4

The DG4 is a two-stage push-button dew-point generator which operates in the range of -75 to +20°Cdp (-103 to +68°Fdp). It can be delivered with between 3 and 10 factory-set dew point settings, selectable from the front panel keypad. Its RS232 communication port enables further automation, particularly when used in conjunction with a UKAS certified hygrometer. The DG4 offers maximum flexibility via its pre-set values combined with the mixing ability of the DG3.

VDS3

The VDS3 is a sophisticated computer controlled dewpoint generator that operates in the range of -100 to +20°Cdp (-148 to +68°Fdp). Individual three stage mass flow controllers select precise proportions of wet and pre-mixed air. Humidity injection is achieved by a liquid mass flow controller and controlled evaporation system. The Vapor Delivery System (VDS) gives repeatable and flexible control of the generated dew point and can be programmed with up to 13 presets that can be activated manually or as part of an automatic calibration program.

Technical Specifications (DG2, DG3, DG4)

Model	DG2	DG3	DG4
Mixing Stages	2 stage	1 stage	2 stage
Humidity Range	-75 to +20°Cdp (-103 to +68°Fdp)	-40 to +20°Cdp (-40 to +68°Fdp)	-75 to +20°Cdp (-103 to +68°Fdp)
Gas Supply	7 Nl/min (14.8 scfh) @ 0.68 barg (10 psig) and -75°Cdp (-103°Fdp)
Gas Output	1 to 5 Nl/min (2.1 to 10.6 scfh) air @ 0.5 to 1 barg (7 to 14 psig)
Filter	Particulate filter
Saturator	Polycarbonate and porous polyethylene sinter
Heating	Finned heating elements, 500 watts, fan circulation
Power Supply	220 to 240 V, 50Hz or 100 to 120 V; 60Hz
Storage Temperature	+5 to +40°C (+41 to +104°F) (with saturators empty)
Operating Temperature	+18 to +24°C (+64 to +75°F)
Enclosure Size	19" sub-rack x 12U high x 400mm (15.8") deep	19" sub-rack x 6U high x 340mm (13.4") deep
Enclosure Size	20kg (44lbs)	9kg (20lbs)	25kg (55lbs)

Technical Specifications (VDS3)

Model	VDS3
Dew-point range	-100 to +20°Cdp (-148 to +68°Fdp) (factory default preset values= –100, -90, -80, -70 -60, -50, -40, -30, -20, -10, 0, +10 and +20 °C (+68°F))
Output stability	±0.5°C
Required Gas Supply	30 Nl/min (63.6 scfh) @ 4.8 barg (70 psig) pressure <13.8 ppb_V (–100°C / -148°F atmospheric dew point) moisture content
Gas Output	10 Nl/min (21.2 scfh) @ 0.5 barg (7.3 psig)
Cable Connection	USB (type B) for PC Control RS485 (9 way D plug) for Setup
Water Reservoir	Material: ABS Capacity: 1 litre
Power Supply	220 to 240 V AC or 100 to 120 V AC 50/60 Hz
Power Consumption	500 Watt maximum
Power Connector	3 pin IEC
Power Supply Fuse	3A (F) quick blow
Operating Temperature	+10 to +40°C (+50 to 104°F)
Construction	Painted diecast aluminum enclosure with smoked glass door. Overall dimensions: 1020 x 555 x 600mm (40 x 22 x 24") (h x w x d)
Weight	65kg (143lbs) maximum

Related Products

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S8000 Remote
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S4000 Remote
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S8000 Integrale
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