Leaders in professional radon instrumentation and analysis solutions    

 

Products

 

DURRIDGE offers a variety of products and accessories built around our flagship radon detector, the RAD7. Each is explained in detail below.

Main Products

Durridge RAD7  Electronic radon detector with real-time monitoring and spectral analysis
RAD H2O  Radon In Water Accessory for the RAD7
RAD AQUA  Continuous Radon in Water Accessory for RAD7
Big Bottle System  High Sensitivity Radon In Water Accessory for the RAD7
Water Probe  Slow Response Monitoring of Radon in Water
DRYSTIK  Active Moisture Exchanger to reduce the humidity of the air entering the RAD7
Soil Gas Probes  In-Ground Radon Detection
Range Extender  Increase the range of the RAD7 in high radon areas
Emission Chambers  Bulk and surface emission detection

Accessories

CO2 Logger  CO2 Sampling Data Logger
Cool Trap  Remove moisture from air entering the DRYSTIK and RAD7
Duty Cycle Controller  Accessory for Soil Probe and DRYSTIK Model ADS-1
Indoor Faucet Connector  Adaptor for taking tap water samples
Natural Rock Sample System  Monitor RAD7 performance up to once per month
Relay Box  Accessory for issuing alerts and controlling the RAD7 operating environment
Water Switch  Prevent water from entering the DRYSTIK and other sensitive devices


 

RAD7 Radon Detector

Electronic radon detector with real-time monitoring and spectral analysis


RAD7 electronic radon detector


RAD7 with optional bluetooth adaptor


RAD7 Standard Setup Diagram


Alpha Energy Spectrum

 

The DURRIDGE RAD7 is a truly versatile radon detector of mature and yet still state-of-the-art design. Its specifications match or exceed those of the most expensive radon measurement devices in the world. At the same time, it incorporates a number of exclusive features that are found in no other radon detector, regardless of price. Incredibly, the RAD7 is affordable.

The RAD7 is a sophisticated measuring instrument widely used in laboratories and research work around the globe, by radon testers, mitigators and home inspectors, in mines and deserts, on the ocean and up volcanoes, at extremes of temperature.

The RAD7 is also the simplest computer-driven electronic detector to use, with pre-programmed set-ups for common tasks. It's built to withstand everyday use in the field. A rugged, handsome case encloses the detector, which is self-contained and self-sufficient. The RAD7 comes complete, with a built-in air pump, rechargeable batteries, and a wireless infrared printer. The printer can be left in your office or your car, when desired, and the detector will collect data and store it for later printing or downloading to a PC.

The RAD7 is a Sniffer that uses the 3-minute alpha decay of a radon daughter, without interference from other radiations, and the instantaneous alpha decay of a thoron daughter. The RAD7 sniffs out entry points and radon gushers and recovers in minutes from high radon exposures. The RAD7 is also a Continuous Monitor that measures the EPA action level of 4 pCi/L, with 10% standard deviation, in under two hours. At the end of each run, the detector prints out a complete report.

RAD7 Advantages


Precision and Performance

  • Fastest response and recovery times of any electronic monitor/sniffer on the market.
  • Measures EPA action level of 4 pCi/L in just one hour.
  • Recovers from radon highs in minutes - not hours.
  • Spectrum printout verifies correct operation of instrument in field.

Convenience and Ease of Use

  • All-in-one complete, compact, portable unit in handsome rugged carrying case.
  • Microcomputer directs you, step by step, so you can do what you want to do.
  • Programmed set-ups for often-used tests.
  • Audible radon and thoron counts lets you hear the hot spots.

Security and Flexibility

  • Tamper-proof key-lock command secures your RAD7 and assures uninterrupted testing.
  • Easily portable: The RAD7 weighs 9.6 pounds (4.35 kg).
  • Displays, prints, and downloads radon data in your choice of units.
  • Immunity to build-up of 210pb.

Expandability and Value

  • Includes wireless printer and infra-red data link for on-the-spot printouts.
  • Available with a wide range of accessories for measuring radon in water and below ground.
  • Versatile connectivity with an RS-232 port and USB compatibility adaptor
  • Includes CAPTURE software for data retrieval and analysis. Full Macintosh and Windows compatibility.
  • Includes rechargeable batteries and extensive documentation.

Operating the RAD7

The RAD7 is remarkably easy to use. It's ready to operate from the moment you turn it on. The first thing you will see is the Setup Review, which displays the current settings. This allows you to check that your machine is set up the way you want it for your intended use.

Now you and your RAD7 are ready to go to work. The machine is preset for a 1- or 2-day test... or you can preset for your particular job that day. When you arrive on site, just push the buttons and the test runs automatically.

A RAD7 exclusive feature is "Auto" mode. This starts a test in Sniff mode for quick response, a base-line reading. After 3 hours it automatically switches to "Normal" mode for the remainder of the test, assuring statistical precision.

You can leave your RAD7 for a 24-hour, 48-hour or any-hour test, knowing that the measurements will be correct, thanks to the "Test Lock" command, which locks the machine until you return. The display shows "DURRIDGE RAD7", the test continues, and no amount of tampering - intentional or unintentional - can influence it.

action level of 4 pCi/L, with 10% standard deviation, in one hour. At the end of each run, the detector prints out a complete report.

USB and Bluetooth Connectivity

Stored RAD7 data may be downloaded to a computer using a USB or serial connection. DURRIDGE offers a dedicated RAD7 communications software package called CAPTURE, which automatically transfers RAD7 data to disk, displays radon graphs, and produces a variety of supplementary information. CAPTURE can also monitor a RAD7 in real time with its Chart Recorder. Learn more about CAPTURE here.

For situations where the RAD7 can not be directly connected to a computer, DURRIDGE offers the Parani SD1000 Serial to Bluetooth Adaptor. This adaptor offers a 100 meter wireless range, and it comes pre-configured for plug and play compatibility with the RAD7 and CAPTURE. An optional 16 hour battery allows the adaptor to be used even in the absence of a reliable power source.

 

RAD7 Specifications

Functionality:

Modes of Operation

SNIFF  Rapid response and rapid recovery radon measurement
THORON  Radon and thoron measured simultaneously and independently
NORMAL  High sensitivity
AUTO  Automatic switch from SNIFF to NORMAL after three hours run
GRAB  Analysis of grab samples
WAT Automatic analysis of water samples with RAD H2O accessory

Measurements

Radon in air with Sniff protocol for quick, spot reading
Thoron in air for searching for radon entry points
Radon in air 1-day, 2-day or weeks protocol for long term measurement
Radon in water batch samples with RAD H2O and Big Bottle System
Continuous radon in water with RAD AQUA and Radon-in-Water Probe
Radon in soil gas with Soil Gas Probe and Active DRYSTIK
Radon emission from soil and hard surfaces with surface emission chamber
Bulk radon emission from bulk materials and objects

Data Storage

1,000 records, each with 23 fields of data
Log of printer output also stored

Sample Pumping

Built-in pump draws sample from chosen sampling point
Flow rate typically 800ml/min

Print Output

Short, medium or long format data printed after each cycle
Run summary printed at end of run, including averages and spectrum

PC Connectivity

RS232 serial port, full remote control implemented in CAPTURE Software.
Optional serial to Bluetooth adaptor for wireless PC connectivity.

Audio Output

GEIGER Tone beeps for radon and thoron counts
CHIME Chime only at the end of each cycle, otherwise silent
OFF No sound

Tamper Resistance

TEST LOCK command locks keypad to secure against tampering

Technical Specifications:

Principle of Operation

Electrostatic collection of alpha-emitters with spectral analysis
Passivated Ion-implanted Planar Silicon detector
SNIFF mode counts polonium-218 decays
NORMAL mode counts both polonium 218 and polonium 214 decays

Built-In Air Pump

Nominal 1 liter/minute flow rate
Inlet and outlet Luer connectors

Connectivity

RS-232 port up to 19,200 baud rate
USB adaptor is included with every RAD7

Measurement Accuracy

+/-5% absolute accuracy, 0% - 100% RH

Nominal Sensitivity

SNIFF mode, 0.25 cpm/(pCi/L), 0.0067 cpm/(Bq/m3)
NORMAL mode, 0.5 cpm/(pCi/L), 0.013 cpm/(Bq/m3)

Radon Concentration Range

0.1 - 20,000 pCi/L (4 - 750,000 Bq/m3)

Intrinsic Background

0.005 pCi/L (0.2 Bq/m3) or less, for the life of the instrument

Recovery Time

Residual activity in Sniff mode drops by factor of 1,000 in 30 minutes

Operating Ranges

Temperature: 32° - 113°F (0° - 45° C)
Humidity: 0% - 100%, non-condensing

Cycle Range

User controllable number of cycles, from 1 to 99 to unlimited, per run
User controllable cycle time, from 2 minutes to 24 hours

CAPTURE Software

Compatible with Microsoft Windows XP and 7, and macOS
Automatic RAD7 location, connection and data download
Graphs radon, thoron, temperature and humidity over time
Automatic humidity correction
Statistical analysis tools track concentration averages and uncertainties
Chart Recorder mode provides real-time RAD7 status monitoring
Control RAD7 operations from computer via direct or remote connection
Automatic calculation and display of radon in water for RAD AQUA
Automatic combination of multiple RAD7 data

Physical Specifications:

RAD7 Dimensions

11.5" x 8.5" x 11" (29.5 cm x 21.5 cm x 27.9 cm)

RAD7 Weight

9.6 pounds (4.35 kg)

Shipping Dimensions

17" x 17" x 17" (43 cm x 43 cm x 43 cm)

Shipping Weight

33 pounds (15 kg)

LCD Display Output

2 line x 16 character alpha-numeric display

Case Material

High density polyethylene

Infrared Printer

Omniprint OM1000 Wireless Infrared Printer included

Power Supply

11-15V DC (12V nominal) @ 1.25A, center pin positive, or included internal EnerSys sealed lead acid rechargeable battery pack (6V nominal, 30Wh, 5Ah) See RAD7 Battery Material Safety Data Sheet (PDF)

Battery Longevity

24 hours in SNIFF mode; 72 hours in Monitor mode

 

Documentation

RAD7 Manual (PDF)

RAD7 Specifications (PDF)


Media

Getting Started: 1-Day Test with the RAD7 2014 YouTube video (9 min.)


The RAD7 comes with all of the components and accessories shown below. View Details


Featured Articles

The RAD7: How Technology Translates to Performance (HTML)

Application Note: Sniffing for Thoron (HTML)


Related Accessories

RAD H2O (HTML)

RAD AQUA (HTML)

Water Probe (HTML)

Soil Gas Probes (HTML)

DRYSTIK (HTML)

Duty Cycle Controller (HTML)

Range Extender (HTML)

Big Bottle System (HTML)

Emission Chambers (HTML)

Relay Box (HTML)


RAD7 Software

CAPTURE Software for Macintosh OSX and Windows (HTML)


Purchasing

Price List (HTML)


 

RAD H2O

Radon In Water Accessory for the RAD7

 
 

The RAD H2O is an accessory for the RAD7 that enables you to measure radon in water over a concentration range of from less than 10 pCi/L to greater than 400,000 pCi/L. By diluting your sample, or by waiting for sample decay, you can extend the upper range to any concentration.

The equipment is portable and battery operated, and the measurement is fast. You can have an accurate reading of radon in water within an hour of taking the sample. The RAD H2O gives results after 30 minutes analysis with a sensitivity that matches or exceeds that of liquid scintillation methods. The method is simple and straightforward. There are no harmful chemicals to use. Once the procedure becomes familiar and well understood it will produce accurate results with minimal effort.

By taking two simultaneous samples, analyzing one immediately, waiting a week or more and then analyzing the other, the radium (226Ra) content of the water may be calculated.

Product Highlights

  • Portable: Complete kit provided in fitted case; weighs just 13 lbs.
  • Automatic: Procedure is controlled fully by the connected RAD7.
    Printouts provide data on radon concentration in water.
  • Fast: Analysis can be completed within one hour of taking the water sample.
  • Accurate: The RAD H2O provides results as accurate as liquid scintillation.
  • Sensitive: More sensitive than liquid scintillation.
    Lowest limit of detection is 10 pCi/L (20 minute count).
  • Clean and Safe: Involves no hazardous materials or chemicals.
  • Proven: Used by individuals and labs throughout the world for over ten years.
  • Great Value: Practically no running costs.

Configuration

A vial containing a water sample is set up in a closed air loop with the RAD7. The RAD7 pump operates automatically for five minutes to aerate the sample, distributing the radon that was in the water throughout the loop. The RAD7 waits a further five minutes while the 218Po count rate approaches equilibrium and then counts for four five-minute cycles. The radon concentration in the water is calculated directly.

RAD H2O Physical Specifications

RAD H2O Shipping Dimensions

19" x 16" x 8" (48 cm x 41 cm x 20 cm)

RAD H2O Shipping Weight

15 pounds (6.8 kg)

 


Documentation

RAD H2O User's Manual (3D Printed Aerator Cap) (PDF)

RAD H2O User's Manual (Stainless Steel Aerator) (PDF)

Media

RAD H2O Components (Illustration)

RAD H2O Configuration Diagram

Featured Articles

Product Comparison: Radon In Water Accessories (HTML)

Related Accessories

DRYSTIK (HTML)

Big Bottle System (HTML)

Indoor Faucet Connector (HTML)

Purchasing

Price List (HTML)

RAD H2O connected to RAD7 (not included)

RAD H2O case and contents

RAD H2O configuration diagram

 


 

RAD AQUA

Continuous Radon in Water Accessory for RAD7

 
 

The RAD AQUA is an accessory for the DURRIDGE RAD7 radon detector that is used to bring the radon concentration in a closed air loop into equilibrium with the radon concentration in a flow-through water supply. It consists of a spray chamber, called an "exchanger", that brings the air and water into equilibrium. The radon in the air is monitored continuously by the RAD7.

The partition coefficient (the ratio of radon concentration in the water to that in the air at equilibrium) is determined by the temperature at the air/water interface. This temperature is measured with a temperature probe inserted into the exchanger. At typical room temperature the coefficient is about 0.25. That means the concentration of radon in the air is four times higher than in the water. As a result, the system's sensitivity to radon in water is four times higher than the sensitivity to radon in air.

It takes time for the water to deliver radon to the air loop and for the RAD7 to respond to the changed radon concentration. With optimum configuration the response time of the system may be reduced to less than half an hour.

Product Highlights

  • Radon and Thoron Measurement: Continuous monitoring in water.
  • Simple to Use: Just connect it to the tap and hook it up to the RAD7.
  • Fast: 95% response in 30 minutes.
  • Sensitive: Can monitor radon even in concentrations below 1 pCi/L.
  • Accurate: Measurements are precise within +/- 5%.
  • Clean and Safe: Involves no hazardous materials or chemicals.
  • Complete: Includes temperature logger and necessary software.
  • Great Value: Practically no running costs.

How it Works

Water passes continuously through the RAD AQUA exchanger. Air flows in a closed loop through the exchanger and through the RAD7. Radon in the air comes into equilibrium with radon in the water. From the radon concentration in the air and the temperature of the air/water interface, the radon concentration in the water is determined. This is the fastest, most sensitive method of measuring radon in water, and it can monitor both radon and thoron levels continuously.

RAD AQUA Physical Specifications

RAD AQUA Shipping Dimensions

16" x 8" x 8" (41 cm x 20 cm x 20 cm)

RAD AQUA Shipping Weight

7 pounds (3.2 kg)

 


Documentation

RAD AQUA Manual (PDF)

RAD AQUA Flyer: See Who's Using the RAD7 and RAD AQUA (PDF)

Media

RAD AQUA Standard Configuration Diagram

RAD AQUA Configuration Diagram (with DRYSTIK and Water Switch)

Featured Articles

Product Comparison: Radon In Water Accessories (HTML)

Related Accessories

DRYSTIK Model (HTML)

Indoor Faucet Connector (HTML)

Purchasing

Price List (HTML)

    RAD AQUA Assembly


 

Big Bottle System

High Sensitivity Radon In Water Accessory for the RAD7

 
 

Note: The following photos and diagrams show the Big Bottle System with Aerator Cap Revision C, which is coming soon. For information on the currently available Revision B, see the Revision B version of the product manual.

The Big Bottle System is an accessory for the RAD7 that enables users to measure radon in 2.5L water samples with high sensitivity. The lower limit of detection is well below 1 pCi/L (40 Bq/m3) radon concentration in water. The upper operating limit is 10,000 pCi/L (400,000 Bq/m3). For ranges higher than that, the standard RAD H2O accessory is recommended.

The Big Bottle System consists of several components, including the Tubing Set, Support Stand, Elastic Clinching Strap, USB Temperature Logger, Hermetically Sealed Thermocouple, and two 2.5 L Glass Bottles. The tubing set includes a check valve, aerating stones, and aerator cap. A RAD7 is required, as is either a Laboratory Dryer or DRYSTIK.

The complete system (excluding the optional DRYSTIK), is portable and battery operated, and the measurement is moderately fast. Even for the lowest radon concentrations you can have an accurate reading of radon in the water within two hours of taking the sample.

The Big Bottle System gives results after 120 minutes of analysis, or less, with a sensitivity that far exceeds that of liquid scintillation methods. The method is simple and straightforward, and there are no harmful chemicals to use. Once the procedure becomes familiar and well understood it will produce accurate results with minimal effort.

Soda Bottle Coupler-Cap Accessory

For added convenience and versatility, the Big Bottle System can be used with standard soda bottles of any size from 500 ml to 2 liters. This configuration requires the Soda Bottle Coupler-Cap accessory, which is used with an aerator system similar to that used in the standard 2.5 Liter jug.

Larger bottles allow for greater precision and lower limits of detection. With a 500ml bottle, it is possible to measure comfortably down to below 5 pCi/L (200 Bq/m3). With a 2L bottle it becomes possible to measure down to 1 pCi/L (37 Bq/m3).

CAPTURE Software Integration

DURRIDGE's CAPTURE software makes it easy to download and analyze data recorded using the Big Bottle System. The program provides controls for identifying the specific experiment configuration, and it automatically calculates radon concentrations with respect to the the specified water temperature and volumes. The software is free to use and is available for download here.

Big Bottle System Physical Specifications

Glass Bottle System Shipping Dimensions

17" x 17" x 17" (43 cm x 43 cm x 43 cm)

Glass Bottle System Shipping Weight

11 pounds (5.0 kg)

Soda Bottle System Shipping Dimensions

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

Soda Bottle System Shipping Weight

5 pounds (2.3 kg)

Retort Stand Shipping Dimensions

37" x 8" x 2" (94 cm x 20 cm x 5 cm)

Retort Stand Shipping Weight

6 pounds (2.7 kg)

 


Documentation

Big Bottle System Manual (Aerator Cap Revision C, PDF)

Big Bottle System Manual (Aerator Cap Revision B, PDF)

Media

Big Bottle System Configuration Photo

Big Bottle System Configuration Diagram

Big Bottle System Aeration Video

Featured Articles

Product Comparison: Radon In Water Accessories (HTML)

Related Accessories

DRYSTIK Model ADS-3 (HTML)

RAD H2O (HTML)

Indoor Faucet Connector (HTML)

Purchasing

Price List (HTML)

Big Bottle System with Aerator and Temperature Data Logger

Soda Bottle Aerator Kit for the Big Bottle System

The Aerator Cap has undergone revisions to improve ease of use and reduce the risk of water entering the desiccant.

 


 

Water Probe

Slow Response Monitoring of Radon in Water

 
 

The DURRIDGE Water Probe is used to collect radon samples from large bodies of water. The probe consists of a semi-permeable membrane tube mounted on an open wire frame. The tube is placed in a closed loop with the RAD7.

When the probe is lowered into water, radon passes through the membrane until the radon concentration in the air in the loop is in equilibrium with the water. The equilibrium ratio of radon in the air to radon in the water is determined by the temperature, which must be measured.

The probe has the same high sensitivity as the RAD AQUA. As such it can be used to monitor the radon concentration at a specified depth in open water. The probe has an advantage in that it does not need a pump for the water. It will, however, take more than two hours to make a spot measurement or to respond to a step-change in radon concentration. It is important that there be some flow of water around and through the device as it will remove radon from the water in its vicinity as the radon passes into the membrane tubing.

To monitor a water supply, the probe may be placed in a container with the incoming water released at the bottom of the container and overflowing or exiting through an outlet at the top. The water in the container should be completely refreshed with incoming water at least twice an hour.

Water Probe Physical Specifications

Dimensions

9" x 5.5" x 5.5" (23 cm x 14 cm x 14 cm)

Weight

10.8 ounces (306 g)

Shipping Dimensions

12" x 12" x 10" (30 cm x 30 cm x 25 cm)

Shipping Weight

3 pounds (1.3 kg)

Tubing

86" (218 cm) Accurel gas permeable tubing

Connections

(2) 3/16" tubing connectors



Media

Water Probe Configuration Diagram

Featured Articles

Product Comparison: Radon In Water Accessories (HTML)

Purchasing

Price List (HTML)

 


 

Water probe outer view

Water probe internal structure


 

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
(HTML)
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


 

Soil Gas Probes

In-Ground Radon Detection

 
 

When measuring radon underground, it is essential to collect samples without exposing them to the outside air. We offer two heavy-duty soil probes for this purpose: the Hardened Steel Soil Gas Probe, and the AMS Stainless Steel Soil Gas Probe. The specifications of these two soil gas probes are listed below:

Soil Gas Probe Specifications

 

Hardened Steel Soil Gas Probe

AMS Stainless Steel Soil Gas Probe

Construction

Steel

Stainless Steel

Pilot Rod

Included

Not Included

Vacuum Gauge

Optional

Included

Insertion Method

Hammer into ground

Push into ground (hammer optional)

Removal Method

Self-grip wrenches (not included)

Pull out using included handle

Hose Connectors

Two: Female NPT thread and O-ring

One: Female hose connector

Maintenance

Clean and oil after use

Basic cleaning recommended

Shipping Dimensions

60" x 4" x 4" (152 cm x 10 cm x 10 cm)

48" x 4" x 4" (122 cm x 10 cm x 10 cm)

Shipping Weight

8 pounds (3.6 kg)

7 pounds (3.2 kg)

Additional Notes

None

Metal Joints may be taped to prevent outside air from diluting the sample

Probe Placement and Connection

DURRIDGE's Soil Gas Probes operate anywhere above the water table, preferably in soil containing few stones. A pilot rod is hammered most of the way to the depth required, then removed and replaced with the drive rod inside the probe. Once it has been hammered down to the required depth, the drive rod is removed, creating a channel through which soil gas may flow upward.

The soil probe may be connected to the RAD7 by either pushing the plug-in hose connector into the probe, or screwing on the NPT hose connector. Tamping down the soil around the probe prevents the leakage of fresh air into the sample acquisition path or down the outside of the probe to the sampling point.

The Soil Gas Probe may be used in conjunction with the laboratory drying unit and the DRYSTIK, using the supplied plastic tubing.

Modes of Operation

There are three modes of soil gas measurement. One is by obtaining a sample in GRAB mode; another by continuous monitoring using the standard protocol; and the third by operating the RAD7 in THORON mode.

If necessary, the soil gas sample can be pumped out of the ground by a sampling pump, and fed to a Tedlar sample bag for later analysis by the RAD7.

Continuous monitoring is a simpler method of measuring the soil gas radon concentration and provides time resolution in the event that the weather changes. In this protocol, the RAD7 will pump for the first five minutes of every half-hour cycle, and then for only one minute in every five, once the relative humidity drops below 10%. After two hours of continuous monitoring, this would amount to 20 L, which would come from a sphere around the sampling point of around 6" (15 cm) radius. Less porous soils would have a slower flow rate, so the volume of soil gas sampled would be less.

Thoron protocol uses 5-minute cycles, during which the pump is run continuously, to accommodate the short half-life of thoron. This mode produces an approximate indication of underground thoron.


Documentation

Soil Gas Probe User's Manual (PDF)

Featured Articles

Soil Gas Measurement (HTML)

Related Accessories

Duty Cycle Controller (HTML)

Purchasing

Price List (HTML)

Soil Gas Probe configuration

Hardened Steel Soil Gas Probe close-up

AMS Stainless Steel Soil Gas Probe


 

Range Extender

Increase the range of the RAD7 in high radon areas

 
 

The Range Extender mixes fresh air with sample air to reduce the concentration of radon in the air fed to the RAD7 radon detector by an order of a magnitude, greatly increasing its effective range.

The extender consists of two parallel capillary tubes joined at one end to the outlet hose connector. Fresh air is fed to the input of one tube while the incident radon sample is fed to the other. A differential pressure sensor across the two tube inputs, with a needle valve for adjustment, is used to ensure that both capillary tubes have the same pressure drop across them.

With this system the radon concentration delivered to the RAD7 will be reduced by a factor of 10:1 regardless of the strength and flow velocity of the RAD7 pump. The pump can cycle on and off without affecting the reduction factor.

The Range Extender can be used for the measurement of very high radon concentrations in air, in soil gas and in water. It can also be used with any other instrument that has its own pump, for any gas. If used to extend the range of thoron measurement care must be taken to assess and correct for the additional decay of the thoron due to sample acquisition delay.

Range Extender Physical Specifications

Range Extender Shipping Dimensions

12" x 12" x 10" (30 cm x 30 cm x 25 cm)

Range Extender Shipping Weight

4 pounds (1.8 kg)

 


Documentation

Range Extender User's Manual (PDF)

Related Products

RAD AQUA (HTML)

Soil Gas Probes (HTML)

Purchasing

Price List (HTML)


 

Emission Chambers

Bulk and surface emission detection

 
 

DURRIDGE offers two categories of emission chambers: Bulk Emission Chambers, and Surface Emission Chambers. Used with the RAD7 radon monitor, these products make it possible to measure radon emissions from artifacts, and ground surfaces, respectively.

Bulk Emission Chambers

DURRIDGE's airtight Bulk Emission Chambers are perfect for storing samples of rock, soil, and more. Two quick-release ports make it easy to connect the Bulk Emission Chamber to the RAD7 in a closed loop for continuous measurement. The chamber's lid is attached with six thumbscrews, which can be easily loosened when the sample needs to be replaced.

The Bulk Emission Chamber is available in a 2.8L volume. A variety of other sizes are expected to be available soon.

Surface Emission Chambers

Two surface emission chamber accessories are offered for the RAD7 radon detector: the Soil Surface Emission Chamber, and the Hard Surface Emission Chamber. The Soil Surface Emission Chamber has a stainless steel skirt around its circumference to penetrate the ground. The Hard Surface Emission chamber has a flat base with sealant.

For soil emission measurements, the skirted chamber may be placed on the ground and stood upon, to push the steel skirt into the dirt. A closed loop measurement may be completed in approximately 30 minutes. Open loop monitoring may be performed continuously, showing diurnal variation of soil emission and allowing the user to obtain as high a precision as desired.

For hard surface emission measurements, the chamber without the metal skirt, and with a soft seal instead, may be applied to the surface. Closed and open loop measurements may be made.

The closed loop protocol provides a quick and sensitive reading, while the open loop protocol offers increased scope for investigating variations in emission due to changes in parameters such as barometric pressure, temperature, relative humidity, and ambient radon concentration.

Bulk Emission Chamber Physical Specifications

Interior Dimensions

11” x 7” x 2.5” (28 x 18 x 6.4 cm)

Interior Volume

2.8 L ± 0.05 L depending on configuration

Material

Metal

Hose Connectors

Front Mounted

Shipping Dimensions

12" x 12" x 10" (30 cm x 30 cm x 25 cm)

Shipping Weight

6 pounds (2.7 kg)

Surface Emission Chamber Physical Specifications

Outer Dimensions

10” (25.4 cm) diameter by 1.25” (3.2 cm) deep

Inner Cavity Dimensions

8.5” (21.6 cm) diameter by 0.5” (1.27 cm) deep

Partition Dimensions

7.9” (20 cm) long by 0.5” (1.27 cm) wide.

Interior Cavity Volume

Approx. 26.4 cubic in (432.6 mL)

Material

Metal

Hose Connectors

Top Mounted

 

Documentation

Emission Chambers User's Manual (PDF)

Media

Bulk Emission Chamber Setup Diagram (Standard Configuration)

Bulk Emission Chamber Setup Diagram (With DRYSTIK)

Purchasing

Price List (HTML)

 

Bulk Emission Chamber

Interior views of the Bulk Emission Chamber

Soil / Hard Surface Emission Chamber: top view

Bottom views of Soil Surface Surface Emission Chamber (L) and Hard Surface Emission Chamber (R)


 


 

CO2 Logger

CO2 Sampling Data Logger

 
 

The Portable CO2 Sampling Data Logger is designed to log carbon dioxide levels in the air being fed through a RAD7. The sampling allows for elevated ambient temperatures, and relative humidity.

Inside the Sampling Data Logger is an optional battery-operated micro-pump connected to two tubing ports on the side of the unit. The unit is designed to automatically turn itself on (15 seconds up to once every 18 hours), draw gas for a programmable period from the inlet port and expelling it from the discharge port, make a measurement and store the value internally with time stamp. The data is retrieved form the unit via USB connection to a computer running the downloadable DAS software.

The battery-operated, portable Sampling Data Logger comes in five models: 1%, 5%, 30%, and 100% CO2. All models include a data cable for retrieving accumulated measurements. A backlit LCD that changes color according to CO2 levels and is programmable. Filters, fittings, tubing and auxiliary international power supply.

Specifications

  • CO2 Measurement: non-dispersive infrared (NDIR).
  • Measurement Ranges:
    • 1% (0-10,000 ppm)
    • 5% (0-50,000 ppm)
    • 30% (0-300,000ppm)
    • 100% (0-1,000,000 ppm)
  • Sampling Method: Tube sampling (0.30 liters/minute
  • 15,000 measurement capacity
  • Measurement interval 15 second to 18 hours.
  • Sample pump timer (optional).
  • Sensor Life Expectancy: > 15 years
  • Calibration certificate (included)
  • Maintenance Interval: No maintenance required
  • Size: 5.75×5.6×1.3in (146×91×33mm)
  • Tubing sizes: 3/32 or 1/8"

Display

  • LED displays CO2 in PPM for 1%, 5% and in percentage XX.YY% for 30%, 100%

Power

  • 4 AA batteries (not included)
  • International wall power supply (included)

Included Accessories

  • USB A to USB mini cable
  • 1/8 tubing 10 feet
  • International wall mount power supply
  • Moisture trap
  • Particulate and hydrophobic filters
  • Assorted tubing fittings

Warranty

  • 90 Days

Documentation

CO2 Logger Manual (PDF, CO2Meter.com)

Software Support

Data Acquisition System (DAS) Software (HTML, CO2Meter.com)

Documentation

Price List (HTML)


 

Cool Trap

Remove moisture from air entering the DRYSTIK and RAD7

 
 

The Cool Trap is a RAD7 accessory that operates under pressure in a vessel of icy water, directing air through a coil of copper tubing. This process creates condensation and removes excess moisture from the air. The Cool Trap operates upstream of the laboratory drying unit, DRYSTIK, or RAD7, to reduce the amount of moisture advancing through each.

Two versions of the Cool Trap are available: the Bucket-Sized Cool Trap and the Mug-Sized Cool Trap. The Mug-Sized Cool Trap is more portable, while the Bucket-Sized Cool Trap offers greater moisture removal due to its longer tubing. Both versions of the Cool Trap have one air inlet tube and two outlet tubes, one for outputting the dried air, and another for draining the condensed water.

Cool Trap Specifications

 

Mug Sized Cool Trap

Bucket-Sized Cool Trap

Diameter

2.75 in (7.0 cm)

7.50 in (19.1 cm)

Height

5.75 in (14.6 cm)

11.75 in (29.9 cm)

Weight

0.6 lbs (270 g)

3.2 lbs (1.5 kg)

Material

Copper

Copper

Documentation

Cool Trap Configuration with DRYSTIK (PDF)

DRYSTIK Manual (PDF) See Section 2.4, High Humidity Conditions

Media

Cool Trap in Mug Photo

Bucket Sized Cool Trap Photo

DRYSTIK Configuration with Cool Trap Diagram

Related Accessories

DRYSTIK ADS-2 (HTML)

Purchasing

Price List (HTML)

    Mug-Sized Cool Trap


 

Duty Cycle Controller

Accessory for Soil Probe and DRYSTIK Model ADS-1

 
 

Monitoring soil gas in the long term, for geotechnical and earthquake studies, is likely to dilute the soil gas sample with fresh air diffused down from the surface. The DURRIDGE Duty Cycle Controller can control the 12V supply to an Active DRYSTIK Model ADS-1, with a duty cycle anywhere from 100% to less than 1%. This means that the average flow rate can be carefully controlled to eliminate dilution of the sample and enable soil gas sampling to continue indefinitely.

Functionality

The DURRIDGE Duty Cycle Controller controls the on and off time of a DC voltage powered device, resulting in lower power usage, lower consumption of consumable resources, and, in the case of a device with a pump, lower average flow rate. The DURRIDGE Duty Cycle Controller accepts a continually-on supply voltage between 9-15 VDC and converts it to a modulated square wave signal.

The Duty Cycle Controller has an ON time in each cycle of 3 seconds. The OFF time in the cycle may be varied from zero to 1,000 seconds or fully off.

Side benefits to reducing the flow rate include reducing wear on the Active DRYSTIK Model ADS-1 pump and increasing the life of the desiccant.

The Duty Cycle Controller can also control the power to any other 12V device, such as a sampling pump, whose current draw is not more than 1A. Thus a sampling pump may be set, by the Duty Cycle Controller, to pump for three seconds once every minute.


Documentation

Duty Cycle Controller User's Manual (PDF)

Related Products

DRYSTIK Model ADS-1 Discontinued (HTML)

Soil Gas Probes (HTML)

Purchasing

Price List (HTML)

 


 


 

Indoor Faucet Connector

Adaptor for taking tap water samples

 
 

For filling RAD H2O vials or bottles, and feeding tap water into the RAD AQUA spray chamber, DURRIDGE offers an Indoor faucet connector manufactured by Claber Inc. It attaches to any indoor straight neck faucet up to 1¼ inch wide. A rubber seal clamps onto the faucet to prevent leaking or spraying, and a convenient quick-click coupler allows for fast and easy hose removal.

Connector Specifications

Construction

UV-stabilized ABS Plastic

Maximum Water Temperature

104° F (40° C)

Operating Pressure

14.5 PSI (1 Bar) to 58 PSI (4 Bar)

Leak Pressure

145 PSI (10 Bar)

Maximum Faucet Width

2.75 in (7.0 cm)

Maximum Faucet Height

5.75 in (14.6 cm)

Featured Articles

Product Comparison: Radon In Water Accessories (HTML)

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RAD H2O (HTML)

Big Bottle System (HTML)

RAD AQUA (HTML)

Purchasing

Price List (HTML)

Indoor Faucet Connector in use


 

Natural Rock Sample System

Monitor RAD7 performance once a month.

 
 

The Natural Rock Sample system consists of a 21oz (600g) sample of granite gravel from a stone quarry, normally sold by the truckload as construction material. It is enclosed in a container that, by closing two ball valves, may be completely sealed.

Granite, in general, contains trace amounts of both uranium and thorium that has been in the rock since it was formed, millions if not billions of years ago. Therefore all the progeny of both the uranium and thorium decay chains are fully supported and in full equilibrium down to 226-Ra and 224-Ra.

The rock sample is dry and therefore constitutes a rock-steady emitter of both radon and thoron. It is possible to take advantage of that property to check the performance of a RAD7.

The device, as it stands, can provide a means for monitoring long-term changes in both radon and thoron sensitivity. After calibration at DURRIDGE Company, and with the optional Thoron Calibration Check Kit (sold separately), the device can be used for low-precision checking of both the RAD7's radon sensitivity (monthly) and its thoron sensitivity (any time). A copy of the Durridge-issued Natural Rock Sample Calibration Form can be previewed below.

Natural Rock Sample Physical Specifications

Shipping Dimensions

16" x 8" x 8" (41 cm x 20 cm x 20 cm)

Shipping Weight

5 pounds (2.3 kg)

Documentation

Durridge Natural Rock Sample System User's Manual (PDF)

Sample Calibration Form (PDF)

Media

Natural Rock Sample System Configuration Diagram (Illustration)

Natural Rock Sample System Components (Illustration)

Thoron Calibration Check Kit Components (Illustration)

Purchasing

Price List (HTML)

DURRIDGE Natural Rock Sample




Thoron Calibration Check Kit for Natural Rock Sample
(sold separately)


 

Relay Box

RAD7 accessory for issuing alerts and controlling the RAD7 operating environment

 
 

At the end of each cycle the RAD7 can compare the measured radon concentration with each of two user-specified relay thresholds. If the radon level is higher than a particular amount, the RAD7 sets a relay. If it is lower, the relay is reset.

Relays can be used to electronically trigger a warning mechanism at the lower threshold, and an alarm at the higher threshold. Relays can also be used to control ventilation equipment, or to change the concentration of radon in a sealed chamber, without the necessity of a computer.

The DURRIDGE Relay Box facilitates this communication with external instruments.


Purchasing

Price List (HTML)



DURRIDGE Relay Box


 

Water Switch

Prevent water from entering the DRYSTIK and other sensitive devices


    
DURRIDGE Water Switch

 

The Water Switch is a device which cuts off power to a device should water enter the switch. It is specifically designed for the DRYSTIK. The Water Switch consists of a reed switch surrounded by a float that contains a magnet. If the float rises it will turn off the switch, cutting power to the DRYSTIK's pump and preventing water from entering the device and saturing its sensitive NAFION tubing.

Documentation

Water Switch Manual (PDF)

Media

Water Switch Configuration Diagram

Related Accessories

DRYSTIK (HTML)

Purchasing

Price List (HTML)


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