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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Sentek's Answer for Jac le Roux Posting on May 27, 2000 entitled: Diviner 2000 access tube We at Sentek Pty Ltd followed with interest the discussion that followed the posting of Jac le Roux on May 27 entitled: Diviner 2000 access tubes. Now that the discussion seems to be ending we would like to answer the question from our own point view. Like any instrument, both EnviroSCAN and Diviner2000 access tubes have a very detailed and a well-documented installation procedure for different soil types. The proper installation of these access tubes will dictate the proper functioning of these devices. Because of the importance of the installation of the access tubes, Sentek Pty Ltd published An 87 page Installation Guide (Version 1.0) that users can buy and that we recommend for people who will be installing access tubes for either The EnviroSCAN or The Diviner2000 (See below for more details on the Installation Guide). In addition, Sentek Pty Ltd reserved an entire section, in its website, to the installation tools: http://www.sentek.com.au/products/insttools.htm The Sentek Preferred method The Preferred Installation Method is recommended for most soil types. In this method an access tube is hammered into the soil through a stabilizing tripod. A cutting edge at the base of the access tube aids in slicing through the soil profile. The soil is removed from within and slightly ahead of the access tube using a 47.00mm auger. This method prevents the formation of air pockets along the length of the access tube and ensures the least disturbance to the surrounding soil profile, giving a tight contact between access tube and soil. This installation method is the most reliable and provides the best soil moisture data. Sentek has developed a set of precision installation tools specifically for installation of its proprietary access tubes. Slurry Installation Method The slurry installation method is used in soils with a high stone and gravel content. Stony soils are difficult to auger and do not break up evenly. The action of augering can create large air pockets causing unreliable readings. Slurry methods are only to be used where the site soil is found to be high in stone and gravel content. We believe that the right installation of the access tube is the key for a good working Diviner/EnviroSCAN probes. Please refer to our homepage and installation documentation where you can find the proper and detailed information. We always encourage our customer to contact us for help in any subject related to our products. N.B. The Diviner 2000 Access Tube Installation Guide covers the issue of access tube installation in details from site selection to different installation for different soil type up to removing tube once the experiment is finished. The main part of this book include the following: I Introduction Part 1: Site Selection -Relationship between macro & micro zones in the field -Factors that affect crop water use . Climate . Soils . Cultural management . Irrigation system -Macro scale zone selection . Partitioning your property into macro zones . Developing an irrigation scheduling plan -Micro scale selection . Micro zone selection guidelines to select the site . Conducting a distribution uniformity test Part2: Installing an access tube -Introduction -Safety first -What is good versus bad installation? -Standard manual installation method. . Introduction . Items required for manual installations . Installation procedure . Troubleshooting the preferred manual installation method. -Moist and sticky heavy clay soils -Dry and heavy clay soil -Gravelly soils -Extremely dry and loose sand -Watertables -Stony soils . Slurry installation method -What are the different slurry methods . Items required for slurry installation . Slurry installation procedure Part3- Removing access Tubes You can have a copy of the Installation Guide, Version 1.0 for just U$ 40.0. Sincerely, Ali Fares, Ph.D. Hydrologist/Soil Scientist Applied Science & Concepts Department, Sentek, Pty, Ltd 77 Magill Road, Stepney, South Australia. 5069 Australia Email AFares@Sentek.Com.Au Tel 61 8.8366.1962. In Sentek we do not sale you a sensor, we help you get your job done right! Please feel free to contact our professional team if you have any question.