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Technical Description <br />SYSTEM CENTRAL CONTROL UNIT WITH FOUR SENSORS <br />GENERAL DESCRIPTION <br />As shown in the drawings that follow, System 1 consists <br />of four fiber optic liquid hydrocarbon sensors, each of <br />which is contained within standard two (2) inch diameter <br />screen pipe. <br />Fiber connectors connect the sensor to the fiber optic <br />cables which in turn are connected to the control/monitor <br />unit. As shown in Section A -A of the cross-section diagram, <br />the interconnecting fiber optic cables are permanently buried <br />in either the ground or in the concrete. Since the fiber optic <br />cables do not carry electric currents -- the fiber optic cables <br />do not require conduit to contain them. <br />We believe that the installation costs will be greatly <br />reduced over electric type sensors, e.g., electrical contrac- <br />tors will not be required (there is no electricity beyond <br />the control unit; and, the control unit itself is battery <br />operated, normally). <br />Control Unit Description <br />The control unit is a NEMA waterproof, steel enclosure i <br />which is easily installed above ground. Fiber optic connectors <br />on the bottom of the enclosure allow ease of installation in the <br />field. <br />