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LG 113 Vendor/Template Pagel of 3 NOW Local Guidance (LG) Letter 113 [updated:November 23,2004 Issue Date:April 18,1997 Revision Date:December 17,2003 Beaudreau Electronics, Inc. Models 404 and 406 Liquid Level Sensors, Models ES1 , 510 and 516 Discriminating Sen with Models 500 and,5 'i44odel 522 Remote Monitoring System, and Model S22T Monitoring System LIQUID-PHASE INTERSTITIAL DETECTOR Detector: Output type: qualitative, discriminating Sampling frequency: continuous Operating principle: float switch (Model 404), refractive index of liquids (Model 406, Model EOS100), polymer strip, hydrocarbon-only (Model 510), optical sensor and conductivity (Model 516) Test Results: *Califomia requires annual certification of all leak detection equipment.The certification of discrim sensors should include functional testing of both water and product detection capabilities. Model 510: Currently the SWRCB UST Program staff discourages the use of polymer strip discriminating new installations in California.This is due to concerns about the impact that repeated/prolonged exposu hydrocarbons may have on the sensor's ability to alarm and recover from alarm reliably. Since current ev protocols do not address this issue, no new polymer strip sensors should be installed until new evaluatio are in place. Model 516: This sensor can only respond to liquid directly in contact with the detection element,an to detect a product release floating on an existing pool of water whose height exceeds the level of 1 detection element. Model 404 Liquid Level Sensor unleaded diesel water gasoline Detection time (sec) <1 <1 <1 Fall time manual reset manual reset manual reset Precision (in) 0.0124 0.0167 0.0067 Lower detection limit(in) 0.89 0.72 0.68 Model 406 Liquid Level Sensor http://www.swrcb.ca.gov/cwphome/ust/leak_prevention/lgl13Nendor Files/beaudreau elect... 3/28/05