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c®R®mwwr®ww _ <br />RAOUILN <br />Results of Evaluation of Liquid -Phase Probe Model FD22191MA <br />The EPA liquid test methods were modified to allow the 2 1/2 -inch liquid <br />probe to function properly. The revisions consisted of adding hydrocarbon test liquid to <br />the test chamber after the blank test without removing the probe from the water. While <br />the EPA <br />test method is sufficient for many detectors, with this detector -there had been <br />problems ass• d with removingprobe om the water between the blank ar <br />the *✓. rs! ! procedure more closely!•conditions the <br />detector would experience in the field. Despite the revisions, during testing the 2 1/2 - <br />inch float often had to be adjusted after addition of hydrocarbon test product to obtain a <br />correct response. <br />For all test liquids, the detector's accuracy at 0.32 cm and 0.64 cm <br />thicknesses was 100%. Average detection times at these thicknesses ranged from one to <br />four seconds. Average fail times were three and four seconds. The detector was not <br />able to detect 0.04 cm layers of hydrocarbon. Its accuracy at this thickness was, <br />therefore, 0%. Accuracy and response time test results for this detector are presented in <br />