Leaders in professional radon instrumentation and analysis solutions    

 
 

DRYSTIK

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 has at its heart a Nafion humidity exchanger with diaphragm pump, fixed and variable flow limiters, and a programmable Duty Cycle Controller. These are all contained in a compact enclosure. The DRYSTIK’s pump compresses the sample air inside the membrane tubing, initiating the transfer of water molecules to the outer purge flow, drying the incoming air as it moves through the device.

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.

DRYSTIK Performance

DRYSTIK Model*

Initial Humidity

Humidity after 300 min.**

ADS-3-12

32%

17%

ADS-3-48

34%

10%

ADS-3-144

48%

7%

*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

Dimensions

11.5" x 7.75" x 3.25" (29 cm x 20 cm x 8 cm)

Weight

4.40 pounds (1.54 kg)

Shipping Dimensions

14" x 14" x 14" (36 cm x 36 cm x 36 cm)

Shipping Weight

12 pounds (5.4 kg)

LCD Display Output

2 line x 16 character alpha-numeric display

Case Material

Beige ABS Plastic Enclosure

Power

12V DC in (1.25A)

DRYSTIK ADS-3R (Ruggedized) Physical and Technical Specifications

Dimensions

13.75" x 11.5" x 5.75" (35 cm x 29 cm x 15 cm)

Weight

7.20 pounds (3.27 kg)

Shipping Dimensions

14" x 14" x 14" (36 cm x 36 cm x 36 cm)

Shipping Weight

15 pounds (6.8 kg)

LCD Display Output

2 line x 16 character alpha-numeric display

Case Material

Rugged Black Pelican Case

Power

12V DC in (1.25A)

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

Normally closed

Coming Soon

Turn On Voltage and Peak Current

Coming Soon

Hold On voltage and Current

Coming Soon

Dimensions

4.25" x 2" x 1.25" (10.8 cm x 5.1 cm x 3.2 cm)

Weight

4.9 ounces (1.40 g)

Power Socket

Coming Soon

Hose Socket

Coming Soon

On Air Flow Resistance

Coming Soon

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.


Documentation

DRYSTIK User's Manual (PDF)

Media

DRYSTIK Model ADS-3 Standard Configuration Diagram

DRYSTIK Model ADS-3: Alternative Drying Tube Placement Diagram

Water Switch Accessory

Related Products

12-inch Passive DRYSTIK (HTML)
Water Switch
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DRYSTIK Model ADS-2
Discontinued (HTML)
DRYSTIK Model ADS-1
Discontinued (HTML)

Purchasing

Price List (HTML)



Ruggedized DURRIDGE DRYSTIK ADS-3R (Open)



Ruggedized DURRIDGE DRYSTIK ADS-3R (Closed)



DURRIDGE DRYSTIK ADS-3R Faceplate



DURRIDGE DRYSTIK ADS-3



DURRIDGE DRYSTIK ADS-3 Faceplate

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