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Today is
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DRYSTIK
Moisture Exchanger
| This simple device allows moisture in incoming air to be transferred to the dry, outgoing air from the RAD7. As a result, the air entering the drying unit has already lost most of its moisture, so that the desiccant will now last for months, instead of days. |
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There are two tubes, one inside the other. The air sample flows along the inner tube on its way to the drying unit, while the space around the inner tube is purged with dry air coming from the outlet of the RAD7. The two flows are in opposite directions, so that the sample air leaves the DRYSTIK at the same end as the dry exhaust air enters the purge shell. |
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| The inner tube is made of NAFION, a Teflon based material that allows water molecules to move through it, but is impermeable to air or radon molecules. |
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The tubing with a small 5/16" ID segment at its end should be attached to the inlet of the drying unit (at the screw-cap end). The long piece of 1/8" ID tubing, from the same end of the DRYSTIK, should be attached directly to the outlet hose luer connection on the RAD7. Short lengths of tubing at the other end of the DRYSTIK are placed there to inhibit the diffusion of moist ambient air into the tubes of the DRYSTIK.
The 12" DRYSTIK, as shown, is available for $185, net. In typical
conditions, it will preserve the desiccant for two months of continuous
(24/7) use, instead of 10 days. A deluxe version, 48" coiled in
a case, sells for $401, and will preserve the desiccant for over three
months in the same circumstances.
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For SNIFFING for thoron and radon, use the small drying tube with the DRYSTIK. Together they form a convenient wand that is light to handle. The desiccant in the small drying tube will last the whole day and more. (12+ hours of continuous use in typical conditions), instead of 3.5 hours without the DRYSTIK.
When connecting the DRYSTIK and small drying tube together,
remember to have the two air streams flowing in opposite directions through
the DRYSTIK, so that the sample air leaves the DRYSTIK from the same
end that the purging, dry air, from the RAD7 enters it.
The DRYSTIK now enables users to enjoy the full capabilities provided by the superior RAD7 technology, with its rapid response and recovery, vanishingly small background, thoron specific sniffing, and radon-in-water accessories, with the need to replace and/or regenerate the desiccant only after a long period. The periods, in fact, are now so long that the cost of replacing used desiccant with new Drierite becomes insignificant.
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