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• Page 1 July 17, 1992 40 <br />Test Procedures for Evaluating Leak Detection Methods: <br />Liquid Contact Point Sensors - Out of Tank Product Detectors <br />November 1991 <br />Test Results for <br />Veeder-Root UST Monitoring System: Model ILS 350 <br />with Interstitial Liquid Sensor for Steel Tanks 0794390-420 <br />July 1992 <br />Monitor: Veeder-Root UST Monitoring System: Model ILS 350 (serial # Beta 013) <br />Probe Diameter = 3.77 cm <br />Test Chamber Diameter - 4.8 cm <br />The Detection System described above was tested for its ability to detect test liquids <br />In contact with the point sensor. The following parameters were determined: <br />• Detection Accuracy - The measure of sensor response to the presence of liquids. <br />• Response Time - Amount of time the detector must be exposed to liquid before it responds. <br />• Recovery Time - Amount of time that passes before the detector returns to its baseline reading <br />after the test liquid is removed. <br />• Lower Detection Limit - The smallest liquid concentration that the detector can reliably detect. <br />• Minimum Sensitive Height - The minimum sensor length required to be in contact with the liquid product <br />to cause sensor activation. <br />• Product Activation Height - The height of liquid to cause sensor activation. <br />• Specificity - Indicates the level of response, of the detector, to several different liquids. <br />Camegie Mellon Research Institute 4400 Fdth Ave. Pittsburgh, PA 15213 <br />