DURRIDGE RAD7 User Manual
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DURRIDGE RAD7 User Manual

Electronic radon detector
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Owner:
____________________________
Serial #:
______________
SERVICE RECORD
Date:
Service:
It is recommended that the RAD7 be returned to DURRIDGE Company annually for recalibration.
Electronic Radon Detector
User Manual

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Summary of Contents for DURRIDGE RAD7

  • Page 1 Electronic Radon Detector User Manual 
 
 
 
 
 Owner: ____________________________ Serial #: ______________ SERVICE RECORD Date: Service: It is recommended that the RAD7 be returned to DURRIDGE Company annually for recalibration.
  • Page 2 WARNING Opening the cover of this instrument is likely to expose dangerous voltages. Disconnect the instrument from all voltage sources while it is being opened. Due to battery power, the instrument may still be dangerous. Using this instrument in a manner not specified by the manufacturer may impair the protection provided by the instrument.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION Points of special note Shipping and Contact Information 1 GETTING STARTED: YOUR FIRST DAY WITH THE RAD7 1.1 Unpacking RAD7 Packing List 1.2 General Safety Instructions 1.2.1 Air Travel 1.3 Taking a Look The RAD7 Professional Electronic Radon Detector 1.4 Starting a Two-day Test...
  • Page 4 2.5.10 Special SPrAll 2.5.11 Special S-Load 2.5.12 Special Version 2.5.13 Special Model 2.5.14 Special Serial 2.5.15 Special Beep 2.5.16 Special Relays 2.6 Infrared Printer Alpha Energy Spectrum 3 BASICS OF RAD7 TECHNOLOGY: HOW IT WORKS 3.1 Introduction Table of Contents...
  • Page 5 3.11.5 Contamination by Radon, or Thoron, Producing Solids 3.11.6 Other Alpha Emitters 3.11.7 Beta and Gamma Emitters 3.12 Precision & Accuracy 3.12.1 Dry operation Table: 3.12 Typical RAD7 precision based on counting statistics only. 3.12.2 Humidity Correction 3.12.3 Concentration Uncertainties 3.13 Spectrum Examples 3.13.1 Operational Radon Spectra 3.13.2 Thoron Spectra...
  • Page 6 4.5.7 Calculating Internal Cell Concentration 4.5.8 Internal Cell Thoron Sensitivity Calibration 4.5.9 Setting up a Thoron Measurement 4.5.10 Thoron Mode Recommended RAD7 Thoron Configuration 4.5.11 Thoron Measurements in Standard Radon Mode 4.6 Managing Background 4.7 Airflow Rate Limits 4.7.1 Maximum Airflow Rate 4.7.2 Minimum Airflow Rate...
  • Page 7 6 COMPUTER CONNECTIVITY 6.1 Computer Connectivity Basics 6.1.1 Connecting the RAD7 to the Computer Connecting the RAD7 to a Computer with the StarTech Adaptor Connecting the RAD7 to a Computer with the Keyspan Adaptor 6.2 CAPTURE Software 6.2.1 Introduction to CAPTURE 6.2.2 CAPTURE Installation...
  • Page 8 6.2.7 CAPTURE CLOUD 6.3 RAD7 Communication Protocol 6.3.1 Communication Requirements 6.3.2 RAD7 Command Format 6.3.3 Parsing RAD7 Data Table 6.3.3 RAD7 Data Record Content 6.3.4 Terminal Emulator Tips 6.4 Serial Port Specifications 6.4.1 Communication Protocol Table 6.4.1a Serial Port Pin Assignments Table 6.4.1b Communication Parameters...
  • Page 9 8.2.3 Run/Cycle Number 0000 8.3 Relative Humidity high 8.4 Water Catastrophe 8.5 Battery Voltage Low 8.6 Pathological Values and Error Messages 8.7 CAPTURE RAD7 Detection Failure Appendix 1: WIRELESS INFRARED PRINTER A1.1 Infrared Printer Description A1.1.1 General Printer Information A1.1.2 Printer Features A1.1.3 Power Switch...

  • Page 10: Introduction

    While you can start to make good measurements on the first day of ownership of the RAD7, it can take years to master the subtleties of radon and thoron behavior, and to appreciate the full capabilities of the instrument.

  • Page 11: Getting Started: Your First Day With The Rad7

    First make sure you have everything you are supposed to have. Take the materials out of the packing boxes and see if you have all the items shown in the diagram below, or on the packing list enclosed with the shipment. If anything is missing, please email DURRIDGE immediately or call us at (+1) 978-667-9556. RAD7 Packing List RAD7 and Case Accessories •...

  • Page 12: General Safety Instructions

    Do not open or attempt to repair the machine. from the RAD7 outlet to exhaust into the interior The detector has an internal high voltage supply of the bag will keep the RAD7 in a clean and dry that can generate more than 2,500V. environment.

  • Page 13: Air Travel

    Some airlines and some airline staff are concerned about lead-technology batteries, such as those in It is safe to take the RAD7 on an airplane either as the RAD7.  An MSDS sheet, issued by the battery carry-on or checked baggage.  It is probably...

  • Page 14: Starting A Two-Day Test

    ⅛” ID segment at the other and the printer. Attach the filter to the Inlet port of the RAD7. The air sampling system is now set up for the On first starting up, you may need to set the clock measurement.

  • Page 15: End-Of-Run Printout

    Medium and Long format settings print more information each cycle. If you allow the RAD7 to complete a run, it will print out a summary of the entire run, including: Date and time...

  • Page 16: Starting A Sniff Test

    You will need the same equipment as for the 2-day c) Attach the filter to the Inlet port of the RAD7. test, above, except that a small drying tube should Make sure it is firmly fit onto the inlet. The air be used, instead of the laboratory drying unit.
  • Page 17 However, the thoron >Test Start on the LCD display: daughter, Po-216, has a very short half life (150 ms), so the response of the RAD7 to thoron is [ENTER] n) Push . The pump will start running.

  • Page 18: Basics Of Rad7 Operation

    Sniff to Normal after three hours of measurement. you select it by pressing . The enter key tells the RAD7 that you have made your selection. Lower left shows the count-down timer (00:30:00 You are telling it what you want it to do.

  • Page 19: Quick Save-And-Restart

    B, C, D, etc. Bottom left is the battery voltage. This should The RAD7 records 8 windows (A - H) every time range from about 6.00V to 7.10V. A discharged you make a measurement. They separate counts battery (less than 6.00 ) should be recharged as...

  • Page 20: Test Start And Test Stop

    00:29:37 00001 2.2.4 Test Clear >Test Clear When the countdown reaches zero, the RAD7 will command causes counting to automatically calculate the radon concentration, be suspended and the current run to be completed store (or "save") the counts to memory, and clear without saving the last (suspended) incomplete the counters to begin a new cycle.

  • Page 21: Test Lock

    >Test Sleep command allows you to turn In order to dry out the RAD7 without using up off most of the electronic circuits, with the power much desiccant, connect the hoses from the switch on, in order to conserve battery charge. A RAD7 to the drying unit, as a loop.

  • Page 22: Data Read

    0501 2.69 ± 2.83 p Sniff 21-MAY-17 19:41 NOTE: The RAD7 does not store spectra from 26.8 °C RH: 7% B:7.06V previous runs, so no spectra will print from memory even if the printer format is Long. If you Section 2...

  • Page 23: Data Com

    Data Com response. 910 cycles free. 2.3.4 Data Summary The RAD7 can store up to 999 cycles of data. As To print a summary report and time graph of a the memory fills with data, the Data Free indicator >Data Summary...

  • Page 24: Data Renumber

    Press to find , then press RAD7 to perform tests according to your needs. delete the run's data from memory and free the The RAD7 remembers all Setup parameters when space for new data. No other run's data will be it is turned off, so access the Setup commands...

  • Page 25: Setup Cycle

    How long a test do you want, and how often do Recycle number may be set from 00 to 99. you want the RAD7 to take a reading (a cycle)? A typical radon test is made up of many cycles.

  • Page 26: Setup Thoron

    Off means the pump is always off. reaching the RAD7, reducing the sensitivity of the measurement to about half that of the standard Use Auto pump setting for routine radon testing.

  • Page 27: Setup Format

    "Counts per minute" is the direct output of the from "new" radon by the sound of the chirps. The RAD7 while "number of raw counts" is the raw thoron beep is the highest pitch. In the Geiger direct output. With livetime, mode, and setting, anyone will recognize a radon "gusher"...

  • Page 28: Setup Review

    "Special SPrOff " command. RADLINK remote control software. If for any When you turn off the RAD7 and turn it on again, reason RADLINK is not present, you will see the it always restores output to the infrared printer.

  • Page 29: Special Sproff

    Cancel the printer to serial port re-direction, so values will be received, encompassing the entirety that output can go to the printer again. of the RAD7’s most recent run. In the latter case the numerical values are encoded into a 2.5.4 Special SetBaud hexadecimal format.

  • Page 30: Special Beep

    Level1 permits the be printed out, because it automatically provides a user to set a level, at which the RAD7 will turn on header for the data printout, with instrument Relay 1, and below which it will turn Relay 1 off.

  • Page 31: Alpha Energy Spectrum

    Long format adds, to the short and medium character. formats, a printed spectrum of the alpha energies, as shown on the following page. Alpha Energy Spectrum Section 2 Basics of RAD7 Operation...

  • Page 32: Basics Of Rad7 Technology: How It Works

    RAD7. It is not necessary to atomic weight unchanged. master the underlying physics to become A decay chain is a series of distinct proficient in the use of the instrument, but some...

  • Page 33: Radon Decay Chain

    Radon Decay Chain Thoron Decay Chain Section 3 Basics of RAD7 Technology...

  • Page 34: Radon-222 (Radon)

    Polonium-210. beta particles, or gamma rays, or combinations of Polonium-210 has a half-life of 138 days and these. The RAD7 was designed to detect alpha decays with a 5.30 MeV alpha particle to particles only, so we will emphasize alpha Lead-206, which is stable.

  • Page 35: Sniffers

    RAD7 are able to do this. Unique to the RAD7 is the ability to sniff for A distinction should be made between true, real- thoron. Polonium-216 has a 150 ms half life, so time continuous monitors, and other instruments the instrument response is virtually instantaneous.

  • Page 36: Rad7 Solid-State Detector

    214-Po decays for higher precision. 3.6 RAD7 Solid-State Detector 3. Thoron sensitivity, counting 216-Po decays for The RAD7 's internal sample cell is a 0.7 liter thoron.   hemisphere, coated on the inside with an electrical In calibration, the RAD7 is exposed to a known conductor.

  • Page 37: Rad7 Spectrum

    CAPTURE, force the graph to display the corrections: data as if the RAD7 stayed in Sniff mode a. B window to A window spill correction.  This is throughout the measurement, and thus see the...

  • Page 38: Windows

    Only after it decays to the counts in A or B or C or D, the RAD7 is polonium-218 does the atom become positively probably not working properly.

  • Page 39: Isotope Equilibrium

    You get the picture. After 10 minutes, Take a RAD7 that is completely clean, with no there are hardly any counts at all in window A. radon or daughters inside. What does the detector Not so for window C, however.

  • Page 40: Modes: Sniff And Auto

    For real-time monitoring, you are always better off D, there will be 34 counts in window A. This is to leave the mode in AUTO. The RAD7 is up to because of the two-way split from Bismuth-212. speed quickly, and is not influenced by old So, in calculating radon concentration, the RAD7 measurements.

  • Page 41: Short-Lived Radon And Thoron Daughters

    RAD7's ability to distinguish daughters by their lead-210 buildup to contribute significantly to alpha energy almost always makes it possible to background in the RAD7, even after years of use. continue working. 3.11.5 Contamination by Radon, or Thoron, 3.11.2 Adsorbed Radon Gas...

  • Page 42: Other Alpha Emitters

    4%, based on inter-comparison results. We estimate the overall calibration accuracy of your 3.11.7 Beta and Gamma Emitters RAD7 to be better than 5%. We look forward to The RAD7's solid state alpha particle detector is new developments in calibration standardization...

  • Page 43: Humidity Correction

    While high humidity reduces the sensitivity of a The high sensitivity of the RAD7 is a result of the RAD7, CAPTURE offers an automatic correction large collecting volume of the measurement of the data, bringing readings back close to dry chamber.
  • Page 44 . Such values are typical for cycles minutes to reach equilibrium with the radon containing zero counts. This should not be taken concentration in the RAD7 chamber. Note that in to suggest that a negative concentration may have Sniff protocol, which uses 5-minute cycles, it is occurred.

  • Page 45: Spectrum Examples

    The count rate in window C is about the same as in window A. C. New radon The RAD7 spectrum after less than one hour of exposure to radon. The peak in window C is just beginning to grow in, but its count rate is still much less than in window A.

  • Page 46: Thoron Spectra

    3.13.2 Thoron Spectra A. New thoron The RAD7 spectrum while continuously sampling thoron laden air 6.78 MeV Po216 B. Thoron in equilibrium The spectrum after continuously sampling thoron laden air for more than 12 hours. The count rate in window A should be about half the count rate in window D 6.05 MeV Bi212...

  • Page 47: Combination Spectra

    3.13.3 Combination Spectra Radon and thoron spectra can add together to The RAD7 takes this into account, and always form combination spectra. Peaks in window B adjusts the window A count rate to correct for the and/or D come from thoron, while a peak in Bi212 count, before calculating the radon window C comes from radon.
  • Page 48 F. New radon with old thoron. Looks like an old thoron spectrum, but the count rate of window A is significantly more than half the count rate of window D. G. New thoron with old radon. Section 3 Basics of RAD7 Technology...

  • Page 49: Pathological Spectra

    It results from the buildup of lead-210 on the detector surface. Lead-210 has a 22 year half-life. It is not a problem for the RAD7 because the peak is outside window A, and thus does not contribute to the background.
  • Page 50 G. Shifted peaks. Peaks appear normal, but are shifted in position. Shows a malfunction of the RAD7, which should be returned to DURRIDGE for service without delay. H. Heavy tails on alpha peaks.

  • Page 51: Using The Rad7: Measuring Radon And Thoron In Air

    4.2.2 Purging special hardware accessories. Chapter 5 introduces applications involving the optional RAD AQUA, For the RAD7 to be all set to go, ready to start a RAD H O, and other DURRIDGE accessories. test, it should be purged for at least five minutes beforehand.

  • Page 52: Test Location

    With the laboratory drying unit used to dry the sampled air, the desiccant will have to be Place the RAD7 near the center of the room, about replaced every 7 to 14 days, depending on the 3 - 4 feet above the floor. Avoid walls, vents, humidity.

  • Page 53: To Print Or Not To Print

    4.2.5 To Print Or Not To Print subsequent placings. An experienced hand can tell if the RAD7 has been moved. But perhaps the It is not necessary to run the printer during a best anti-tampering defense is the data itself.

  • Page 54: Finishing The Run

    If the RAD7 can be accessed If the house was not properly closed up until the before the run is finished, simply place the printer measurement was started, you may expect to see a in position on the face plate and switch it on.

  • Page 55: Sniffing

    While making this sketch map, the RAD7 can be there, to speed, and simplify, the process. The taking a benchmark radon measurement in the same procedure will also give radon center of the room.

  • Page 56: Drilled Sampling Points

    They then install the RAD7 to the location to be tested, or when the suction points of the mitigation system where the RAD7 is pre-occupied with continuous sub-slab radon readings are highest.

  • Page 57: Preparation

    4.4.4 Taking the Sample soils and minerals can diffuse out of the material and travel long distances before they themselves If the RAD7 is at the location, simply start the test decay. Both radon and thoron decay into [MENU][ENTER][ ] [ENTER] ➔...

  • Page 58: Thoron Measurement Issues

    SNIFF fill the internal cell. And the RAD7 clears just as and NORMAL modes. The correction is based on rapidly when you purge the instrument with a fixed fraction of the count rate in the D window...

  • Page 59: Avoiding Longer Lived Decay Products

    The sample decays slightly in going from the inconvenience of a few days at worst. RAD7 inlet to the internal cell, due to internal hose and filter volumes. This decay can be 4.5.5 Standard Thoron Setup, Thoron...

  • Page 60: Setting Up A Thoron Measurement

    The 216-Po daughter of thoron has only a 145 ms half life, so the main component in the response time of the RAD7 to a step change in thoron 4.5.9 Setting up a Thoron Measurement concentration is the time taken to acquire the For a quantitative measurement of thoron it is sample.

  • Page 61: Recommended Rad7 Thoron Configuration

    A major concern in radon testing is background. of continuous pump activity, and then the pump The RAD7 has a number of features that help to typically operates for one minute in five for the keep short and long-term background under remainder of the cycle.

  • Page 62: Airflow Rate Limits

    . Let the swiftly due to its rapid decay. RAD7 purge for 5 to 10 minutes, or longer if the sample was exceptionally “hot”. If the RAD7 has been specifically calibrated for thoron however, the specified thoron sensitivity The two alpha peaks decay at different rates.

  • Page 63: Harsh And Hazardous Environments

    RAD7 is to be operated in a harsh environment, such as a cave or mine, where water If the RAD7 is to be placed in a location that is may splash around, the RAD7 may be protected in hazardous to the health of individuals, remote...

  • Page 64: Using Rad7 Accessories: Testing Soil And Water

    These applications and the accessories required for each are described below. The accessories discussed here are not included with the RAD7. For full details on the usage of a given accessory, please see its user manual. All product manuals are available in print form, and on the DURRIDGE website (www.durridge.com)

  • Page 65: The Rad Aqua Accessory

    During this process, the RAD7 is set to operate in continuous mode, as Thoron is usually associated with radon in the soil. described in Chapter 4.2.

  • Page 66: Running The Test

    RAD7 outlet, placed upstream of the RAD7, so that the RAD7 is to form a closed loop. Alternatively, in an open operating at normal pressure. In fact, with an loop configuration the air being drawn from the...

  • Page 67: Closed Loop Configuration

    The container is then connected to of the surface within the sealed boundary, to the RAD7 in a closed loop. The valves are opened determine the emission per unit area. and the RAD7 measures the radon concentration.

  • Page 68: Supporting Accessories

    5.5.2 The Range Extender The Range Extender mixes fresh air with the air being sampled, reducing the concentration of radon entering the RAD7 by a factor of ten. This greatly increases the instrument’s effective range. The Range Extender consists of two parallel capillary tubes joined at one end to an outlet hose connector.

  • Page 69: The Drystik

    RAD7 by transferring moisture from the flow with the built-in Duty Cycle Controller the sample about to enter the RAD7 to the air means that continuous soil gas readings may be being pumped out of the instrument. As the air made indefinitely, without any risk of fresh air...

  • Page 70: Computer Connectivity

    It is also possible to use a terminal emulator included adaptor driver software. If your program to interface with the RAD7, and to write computer has a physical serial port however, it is your own RAD7 communications software using possible to instead use an RS232 DB9 female to the protocol documented later in this chapter.

  • Page 71: Connecting The Rad7 To A Computer With The Startech Adaptor

    Connecting the RAD7 to a Computer with the StarTech Adaptor Connecting the RAD7 to a Computer with the Keyspan Adaptor It is recommended that the RAD7 remain plugged adaptors simultaneously, with each plugged into a into external power to prevent its battery from USB port on the computer (it is not advisable to dying while it is connected to the computer.

  • Page 72: Capture Software

    6.2.2 CAPTURE Installation CAPTURE simplifies the transfer of data from the On Microsoft Windows, an installer program will RAD7 to a computer. It also provides a wealth of install the necessary components and place graphing and data analysis options, plus the ability...

  • Page 73: Feature Summary

    RAD7 monitoring, and RAD7 data and more complete error-corrected CAPTURE CLOUD. An overview of each is RAD7 data in a number of formats, for use in described below. spreadsheets and other analysis tools. Summary reports may also be generated, providing general overviews of the collected data.

  • Page 74: Rad7 Communication Protocol

    The RADLINK firmware, installed standard with return keystroke. This key may be marked "Enter" every RAD7 sold, enables the RAD7 to respond to or "Return" on your keyboard. commands issued through its serial port. With...
  • Page 75 Bits 4 and 5 indicate the measurement type: either Radon in Air (0,0), Wat-40 (1,0), or WAT250 (1,1). Bit 6 indicates whether the RAD7 is in Auto mode, meaning it changes from SNIFF to NORMAL after the first 3 hours.

  • Page 76: Terminal Emulator Tips

    300, 600, 1200, 2400, 4800, If you are using a terminal emulator application to 9600, and 19200 bits per second (baud); these interact with the RAD7, you can gain access to speeds are available through the ‘Special’ additional functionality by making sure the...

  • Page 77: Maintenance

    Drierite desiccant. The water capacity of each When used as a Sniffer, the small desiccant tube is tube is 3 grams. We will assume that the RAD7 recommended. It will last for several hours before pump operates continuously, for an average flow replacement or refilling of the tube is necessary.

  • Page 78: Cascading Drying Tubes

    fine dust particles and all radon daughters from slowly. Full recharge takes about 48 hours. entering the RAD7 test chamber. With the power cord plugged in and the RAD7 in The filters are manufactured in various pore sizes fast charge mode (not measuring radon), the by several companies, including Millipore and batteries will charge more quickly.

  • Page 79: Real-Time Clock And Non-Volatile Memory

    Signal voltage level 0.15V 0.30V Table 7.2 RAD7 Operating Ranges *Note: The RAD7 should not be placed in direct sunlight if the outside temperature is over 100° Fahrenheit (38° Celsius). Instead it should be moved to a shady location. Section 7 Maintenance...

  • Page 80: Service And Repair

    Overall calibration accuracy is in the 7.3.3 Shipping range of 5%. 1. You can send us your RAD7 at any time to The U.S. EPA recommends that continuous radon either one of our Calibration facilities (USA monitors such as the RAD7 be calibrated at least and UK), listed below (see important, specific...
  • Page 81 Phone: (+1) 978-667-9556 ▢ Write only in English on the commercial Fax: (+1) 978-667-9557 invoice. ▢ Use the following description for the RAD7: Declaration Form “Used RAD7 Electronic Radon Detector”. There needs to be documentation proving that the ▢ Insured value US$2,490.

  • Page 82: Upgrades

    214-Po counts from window C into for your RAD7. Please advise us if you want to window B. It is normally around 1% to 1.5% in a have an upgrade made. We intend to keep our current production RAD7.

  • Page 83: Troubleshooting

    NVRAM itself. Chapter 7.1.6. It is likely that once an NVRAM error has Make sure the RAD7 is properly plugged in to an appeared, it will keep appearing until the external power source and is switched on.

  • Page 84: Excessive Uncertainty In Reading

    . The 8.4 Water Catastrophe memory will be emptied and the data structure If water ever enters the RAD7, or if the RAD7 ever reset. goes swimming in the water, it will probably cease to operate and immediate steps should be taken to 8.3 Relative Humidity high...

  • Page 85: Battery Voltage Low

    1. Make sure you are using the latest version of CAPTURE. The software can be downloaded 7. If the RAD7 is not detected when connected to free of charge from the Durridge website. a particular USB port, try connecting it to a different USB port on the computer.
  • Page 86 RAD7 to "wake up”. serial device that is known to work, such as a 10. Make sure the RAD7's baud rate is not set any modem or other instrument. Using a terminal lower than 1200. CAPTURE does not support emulation program such as Durridge Terminal or baud rates of 300 or 600.

  • Page 87: Appendix 1: Wireless Infrared Printer

    A portable wireless printer is provided as a or when the print head temperature exceeds 140°F standard accessory with the RAD7. It uses (60°C). This LED will also flash one time when infrared technology to communicate with the...

  • Page 88: Infrared Printer Component Locations And Functions

    Infrared Printer Component Locations and Functions Appendix 1 Wireless Infrared Printer...

  • Page 89: A1.2 Infrared Printer Operation

    A1.2 Infrared Printer Operation A1.2.1 Precautions A1.2.3 Setup Mode To ensure the proper operation of the printer and The printer has been set up at the factory with the prevent the possibility of voiding the warranty, be following default parameters: sure to observe the following precautions: Baud rate: 9600bps...

  • Page 90: A1.2.4 Using The Printer

    (45 cm) away from the instrument, at an 6. Once all parameters have been set, press and angle of no more than 30 degrees. Issue a RAD7 hold down the SEL button, and then press the command such as Data Print to initiate printing.

  • Page 91: A1.3.3 Cleaning The Printer

    Note: If there was unprinted data in the memory automatically print the remaining data 5 seconds when the infrared printer runs out of paper, and after closing the paper cover. the printer was not shut OFF, then the printer will Wireless Infrared Printer Maintenance A1.3.3 Cleaning the Printer isopropyl alcohol and cotton swabs, and should be...

  • Page 92: A1.4 Wireless Infrared Printer Specifications

    A1.4 Wireless Infrared Printer Specifications The following table contains the physical and technical specifications for the infrared printer. Printing Method Direct thermal Number of Columns 32, 48 columns, 384 dots/line Character Size 0.06 x 0.12 in. (1.5 x 3.0 mm) Line Pitch 0.1 in (4.0 mm) Paper Width...

  • Page 93: Appendix 2: Rad7 Specifications

    Specifications for the RAD7 exceed those of all radon gas monitors made in North America, as well as those in its price range world-wide. This is a partial list of specifications that make the RAD7 so highly regarded in the field.
  • Page 94 • 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 with optional accessories •...
  • Page 95 DURRIDGE, the DURRIDGE logo, and the Works with the DURRIDGE logo are trademarks of DURRIDGE Company Inc., registered in the U.S. Note: DURRIDGE frequently updates its product manuals with new information. The latest version of this manual can be downloaded in PDF format from the following location: www.durridge.com/support/product-manuals/...

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