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Active Moisture Exchanger to reduce the humidity of the air entering the RAD7
The RAD7 radon monitor works most effectively when the incoming air sample has a low relative humidity. The DURRIDGE DRYSTIK Model ADS-3 transfers moisture from the incoming air to the air being pumped out of the RAD7. As the air enters a drying unit (not included) on its way to the RAD7, it will have already lost most of its moisture, greatly extending the life of the desiccant in the drying unit. In certain cases the need for desiccant is eliminated altogether.
The DRYSTIK is available in two enclosures: a standard case which is suitable for laboratory use, and a ruggedized Pelican case which is ideal for demanding field work. Each is available with three different lengths of Nafion tubing, providing differing rates of humidity reduction. The premium 144-ADS-3 and 144-ADS-3R models are capable of bringing the relative humidity of air flowing at 0.15 L/min down below 10% in less than four hours when operating with a 40% duty cycle, and the humidity can be maintained below 6% indefinitely without any desiccant. This allows a RAD7 to operate under optimum conditions with the highest sensitivity and lowest operating cost. At a higher flow rate of 1.2 L/min, the DRYSTIK can bring the RH down below 12%, which is sufficient for enhanced-sensitivity thoron measurement.
For soil gas measurement, the DRYSTIK provides high flow capability for thoron detection. For radon, the ability to lower the flow with the built-in Duty Cycle Controller means that continuous soil gas readings may be made indefinitely, without any risk of fresh air diluting the soil gas sample by diffusing down to the extraction point.
Principle of Operation
The DRYSTIK operates on a principle involving two tubes, one inside the other. The inner tube is made of NAFION, a Teflon based material that permits the movement of water molecules, while blocking air and radon. The air sample flows along the inner tube on its way to a drying unit, while the space around the inner tube is purged with dry air coming from the outlet of the RAD7.
Summary of Benefits
The DRYSTIK 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 cost of replacing used desiccant becomes insignificant.
With a pump upstream and a needle valve downstream of the NAFION tube, compressing the air inside the tube, the DRYSTIK works regeneratively, and can even eliminate the need for desiccant altogether.
*Applies to both ruggedized and non-ruggedized DRYSTIK models.
**Humidity level achieved after 300 minutes at 22-28° C with 100% internal pump duty cycle and no desiccant.
DRYSTIK Performance Graphs (HTML)
DRYSTIK ADS-3 Physical and Technical Specifications
DRYSTIK ADS-3R (Ruggedized) Physical and Technical Specifications
High Quality Pumps and Mounting
In 2013 the DRYSTIK design was updated with a high quality pump, mounted on a shock- and sound-absorbing bridge plate. The new pumps increase the expected life span of newly assembled DRYSTIK devices to 5,000 hours of constant use (or 25,000 hours assuming a typical 20% pump duty cycle). The improved pump is offered in both brushed and brushless varieties. Existing DRYSTIKs may be shipped back to DURRIDGE to be upgraded to the pump of your choice. See the Purchasing link below for pricing details.
External Solenoid Valve (Optional Accessory for DRYSTIK ADS-3R)
The optional External Solenoid Valve Accessory temporarily activates higher airflows which may be triggered by the DRYSTIK ADS-3R at regular intervals. This is useful for pumping short-lived thoron into the RAD7 before it decays. Using CAPTURE software, the DRYSTIK can be configured to enable and disable the Solenoid Valve as needed.
External Solenoid Valve Technical Specifications
Water Switch Accessory
The DRYSTIK is very effective at removing moisture from the air, but it is not effective if liquid water is allowed to enter the device. The optional Water Switch accessory addresses this. The Water Switch is a reed switch with a magnet embedded in a float around it. The device is packaged in a small, airtight container with hose connections, and is placed upstream of the DRYSTIK Model ADS-3. When the Water Switch fills up, it cuts the power to the DRYSTIK, preventing its pump from sucking in liquid water.
DRYSTIK User's Manual (PDF)
Price List (HTML)
• RAD7 Radon Detector
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