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RADIAN <br />COMPOWATION <br />Leak and Vapor Detection Probes."' The test procedure used to test the overfill probe <br />is included in Appendix E. <br />Results of Evaluation of,VaRgr-Phase Probe Model FD221V <br />The vapor -phase probe was calibrated in ultrahigh -purity air. The set <br />screw of the potentiometer was set 1/4 turn counterclockwise from the point at which <br />the detector switched to an alarm state under background conditions. before each test. <br />During accuracy and response time testing, fall times were recorded when <br />the detector control unit went from an "oil" indication to a "dry" indication. Frequently, <br />however, a longer period was required for the calibration to return to its original status. <br />Each subsequent test was not begun until the position of the set screw once again corre- <br />sponded to a 1/4 turn counterclockwise from the alarm point. The results of accuracy <br />and response time testing are summarized in Table 2. <br />1(1)dLWq <br />Test <br />Product <br />Concentr2tion <br />ji (PPMV) <br />+ <br />Ml 40 <br />Synthetic <br />Gasoline <br />JP -4 Jet Fu el <br />I <br />'Document Number 961-403-58-01, Revision Level 06, 1990. <br />N <br />