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• <br />• <br />0 <br />Data Logger Components <br />Data Loggers: Campbell Scientific <br />data loggers are known for their field <br />reliability and offer compatibility with <br />a wide range of sensors and data <br />retrieval options. <br />A single data logger can read a large <br />number of sensors provided they are <br />concentrated into a small area. Addi- <br />tional loggers should be deployed if <br />sensors are distributed over a wide <br />area. This keeps signal cables short, <br />reduces problems with noise, and <br />minimizes the potential for damage <br />from construction activities and elec- <br />trical transients. Cost savings on <br />cable can sometimes pay for the <br />additional loggers. <br />Interface Modules: Certain types of <br />sensors require additional interfaces. <br />For example, vibrating wire sensors <br />require a VW interface, which is con- <br />nected between the data logger and <br />a multiplexer. <br />Multiplexers: Multiplexers increase <br />the number of sensors that can be <br />monitored by a data logger. For <br />example, the CR1000 can control up <br />to seven multi-plexers, each capable <br />of handling 16 to 32 sensors. In prac- <br />tice, the data logger usually controls <br />one or two multiplexers, and addi- <br />tional loggers and multiplexers are <br />employed if there are more sensors. <br />Power Supplies: A power supply <br />provides regulated power to the log- <br />ger and sensors. Power is drawn <br />from a battery that is charged from <br />AC mains power or a solar panel. <br />Weatherproof Enclosures: All field <br />components must be housed in <br />weatherproof enclosures. <br />Data Acquisition Systems <br />Data Retrieval Options <br />Wired Links: Wired links for data <br />retrieval include direct connection to <br />the PC, telephone modems, short <br />haul modems, and multidrop net- <br />works. <br />Wired links are usually less expensive <br />and easier to set up. They are also <br />better for real-time data retrieval. <br />Wireless Links: Wireless links for <br />data retrieval include cell modems, <br />and spread-spectrum radio modems. <br />Wireless links are useful when dis- <br />tances, site traffic, or other obstacles <br />make wired links impractical. Also, to <br />the degree that wireless links elimi- <br />nate surface runs of cable, they also <br />reduce problems caused by electrical <br />transients. <br /> <br />Software Components <br />Logger Control Software: Logger- <br />Net software is used to create moni- <br />toring programs and to retrieve data <br />from logger to PC. <br />Custom Programming: Slope Indi- <br />cator offers custom monitoring pro- <br />grams for Campbell data loggers. <br />The programs, which are created <br />with LoggerNet and can be modified <br />by the user, significantly reduce the <br />time and expense required to deploy <br />the data acquisition system. <br />Web-Based Monitoring: Process- <br />ing and distribute the data collected <br />by data loggers can be a daunting <br />task. Argos Monitoring Software pro- <br />vides an efficient and cost-effective <br />solution to this problem. <br />Argus automatically processes read- <br />ings, checks for alarms, displays <br />graphs, and generates reports. Distri- <br />bution is immediate because Argus <br />works on the internet. With only their <br />web browsers. users can view and <br />download data, whether they are at <br />work, at home, at a client's office, or <br />half-way around the world. <br />See the Argus data sheet or visit <br />www.slopeindicator.com for more <br />information on Argus. <br />A complete data acquisition system <br />consists of data logger components, <br />data retrieval components, and soft T ' <br />ware components. !,f,..