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Reverse Ratio means the leak detector has a smaller diameter piston area than the poppet it is attached to. This smaller piston area keeps the leak detector in the fast fill position (3 GPM) to a higher line pressure while compressing vapor pockets and expanding flexible pipes faster. This means less time tofull flow. The leak detector does not have to completely reset (as with competitive leak detectors) for the poppet to be forced into the reset mode atpump start-up. Smaller Volume / Faster Response Piston Size With a reduced piston size, there is one-fourth the fuel volume to replace when in leak search and one-fourth the fuel volume to return to the line when the pump turns off. This combination makes fora more responsive and faster leak detector. Laoo volume to leave the line for the leak detector to reset and catch leaks. Less volume tVfill and provide full flow for dispensing! Superior Flex -Pipe Performance rmance The reduced surface area ofthe piston significantly reduces the surface area exposed to hydraulic line shock. This results in enhanced performance with steel and fiberglass pipe, and especially with today's flexible pipe. 99 LD -2000\E In the early 1990's, the first commercially successful flexible pipe, Total Containment PP -1 500, was introduced to the U. S. petroleum industry. Due tothe flexibility ofthis pipe system, no line leak detection would work. In 1992' thmWnm/ LO-20OO\Ewas certified for 3GPH @ 10 PSI on Total Containment PP-1500pipe. The 99 LD -2000\E is ehU required for existing PP -1 500 pipe. Additionally, today the 99 LD -2000\E is used in sites that have the same line characteristics as the LD -2000\E was originally certified for, even though the pipe isdifferent. The original certification of the LD -2000\E concerned the bleed -back modulus of PP -1 500 pipe. Today, lines with high bleed -back (generally above 600 mi.) and high head pressure may require the 99 LD -2000\E to pass a field test for annual certification. Consult with factory before ordering and installing the S9LD-2OUU\E. Electronic Line Leak Detection Upgrade! The 99 LD -2000 may be upgraded in the field toeliminate thermal induced o|ovv-f\oxv provide submersible shut -down, and alarm notification to site monitoring equipment. Request information on the ISM -4080, an easy upgrade for existing ornew installations. The iSKO-4g8Ualso stages turbines and controls solenoid valves for loading racks and marine applications. If there is no need for staged turbines, solenoid valve contro|, a|ornn notification or submersible shut'dovvn, request information on the AFlK8-4O731oeliminate false alarms only.