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Six hydrocarbon products were used to evaluate vapor detector specificity. <br />The FD221V detector activated in response to 500 ppmv concentrations of commercial <br />gasoline, JP -4 jet fuel, synthetic gasoline, toluene, and xylene(s). It did not activate to a <br />500 ppmv concentration of n -hexane. These results are summarized in Table 3. <br />I <br />Results; <br />g for <br />Vapor-'`hVapor-Phase Leak Detector Model1 <br />Test Product <br />Detector. Response <br />Commercial Gasoline <br />Activated <br />JP -4 Jet Fuel <br />Activated <br />n -Hexane <br />Not Activated <br />Synthetic Gasoline <br />Activated <br />Toluene <br />Activated <br />Xylene(s) <br />Activated <br />For detectors that give qualitative responses, the lower detection limit lies <br />between two concentrations labeled LDL and LDL-. For commercial gasoline, the lower <br />detection limit of the FD221V was found to lie between 10 and 100 ppmv. For synthetic <br />gasoline, the lower detection limit was between 10 and 500 ppmv. The JP -4 lower <br />detection limit was between 10 and 50 ppmv. The results of lower detection limit testing <br />are summarized in Table 4. <br />Results of Lower Detection Limit Testing for <br />Vapor Phase Leak Detector Model FD221V <br />Test Product <br />LDL. concentration (ppmv) <br />LDL concentration (ppmv):__ <br />Commercial Gasoline <br />10 <br />100 <br />Synthetic Gasoline <br />10 <br />500 <br />11 JP -4 Jet Fuel <br />1 10 <br />150 <br />�0 3 <br />