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12/16/1997 06:51 <br />510658044E <br />9 <br />function, <br />SHIELDS HARPER <br />PAS 07 <br />The LD -2000 leak detector is a <br />1W Ispr mechanical, pressure sensitive, <br />continuous duty line monitor. <br />It has unique design and <br />yet it is designed for use in standard submersible pumps or adapter tees. <br />A patented, internal, free-floating check valve positioned at the downstream end of the teak <br />detector protects the leak detector against damage caused by hydraulic hammer (a rebounding <br />pressure wave formed when the dispenser nozzle is closed_ The check valve also maintains <br />line pressure, sufficient to allow dispensation of fuel immediately, providing that the down- <br />stream dispensing line has no leak. <br />Maintains pressure in the delivery line when no leak is present <br />Detects leaks even if substantial hydrostatic shock occurs in the dispensing line <br />Reduces unscheduled pump maintenance due to check valve deterioration or <br />functional element deterioration <br />Provides improved performance under extreme climatic conditions <br />Sees a leak of 3 GPH or smaller at 10 psi for a full 18 months after date of installation - <br />Overcomes problems caused by thermal contraction and line resiliency in larger <br />delivery systems <br />TEST]RESULTS - A nationally -recognized independent environmental consulting firm <br />conducted twice the mandated number of FPA protocol tests on the LD -2000. Here is what <br />they found: <br />The LD -2000 exceeds the EPA regulations that require detection of a 3 GPH teak at 10 psi <br />with a detection probability of 95 % and a false alarm probability of 5 %. Under conditions <br />of thermal expansion or contraction, the LD -2000 is capable of detecting a 3 GPH leak with <br />a probability of detection of 100 % and a false alarm probability of 0 /, . <br />Under neutral test conditions, the LD -2000 detected leaks under 2 GPH. <br />From pump start-up, the average leak sensing time to full flow was less than 5 seconds. <br />125 ml vapor resiliency was added to the line system with no failures. <br />The LD -2000 detected leaks in the pipe system up to 10' above the leak detector. This test, <br />called a "Head Pressure Reset Test," ensures that all buried pipe is protected. <br />E <br />M <br />