- Highly efficient permeable-membrane dryer
- Dries to -10 Deg. C dewpoint with saturated input
- Does not interact with other sample gases
- Sample flow rate variable from 25-200 ml/minute
- Negligible internal volume
- Rugged, light, low power consumption
The ND-2 Gas Sample Dryer dries saturated air at 25oC to a dewpoint of -10oC, corresponding to a water vapor pressure of 0.26 kPa. It is ideal for subsampling and drying gases prior to analysis. The ND-2 is also available without a pump (model ND-2V) for use with an existing pump or vacuum source.
Most forms of gas analysis require the scrubbing of water vapor from the airstream, because the water vapor dilutes the measured gases. Scrubbing water vapor usually requires chemicals that require frequent replacement. In addition, scrubber chemicals can interact with analyzed gas species, such as CO2.
The ND-2 is an economical and efficient alternative to scrubber chemicals in the medium to long term, and does not interact with anything but water vapor. The ND-2 can dry air saturated with water vapor at 25C to a dewpoint of -10C, corresponding to a water vapor pressure of 0.26 kPa, which is negligible in most applications. Even if completely dry air is required, using the ND-2 as a pre-scrubber will greatly reduce the amount of scrubber chemicals consumed.
The ND-2 uses a strongly polar polymer film that is impermeable to oxygen, nitrogen and carbon dioxide. By creating a strong negative pressure on one side of the membrane, and by using countercurrent exchange principles, the ND-2 gas dryer selectively removes water vapor from the sample stream with very high efficiency – without using expendable chemicals, without interacting with other gases, and without adding significant volume to a gas analysis system.
|Connections:||Nickel plated barb fittings for 1/8in (3mm) i.d. flexible or semi-rigid tubing|
|Drying Efficiency:||With input of water vapor saturated air at 25deg C, output air dewpoint typically -10 deg C at a flow rate of 150 ml/min|
|Flow Rate:||25 – 200 ml/min|
|Interactions:||No interactions with any gases other than water vapor|
|Internal volume:||< 2 ml|
|Operating Temperature:||5 – 45 deg C, relative humidity non-condensing|
|Pump:||Variable speed diaphragm pump with vacuum gauge|
|Technology:||Selectively permeable membrane; no interactions with O2 or CO2|
|Recommended Calibration Interval:||1 Year|
|Power Requirements:||12 – 24VDC; universal adapter supplied|
|Dimensions (W x D x H):||8 x 12 x 5 in. (20 x 30 x 13 cm)|
|Weight:||8 lbs (3.5 kg)|
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