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Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities 7.Inspect the probe. The floats must move freely on the stem without binding. If any parts are S. ELECTRONIC MONITORING damaged or missing, contact the appropriate SYSTEM INSPECTION person. AND TESTING S. Reconnect the probe cable. 9. Set the fuel float in the middle of the probe and 8,1 General. Electronic underground storage tank verify that it is showing the correct inch read- (UST) monitoring systems provide a warning or alarm ing. when a leak in the UST system occurs. The monitoring 10.Slowly move the fuel float up the probe until system and sensors need to be programmed to reflect the overfill alarm is triggered. If the float the conditions for each individual site to ensure proper is moved too quickly, it may not trigger the operation. For the remainder of this section, the term alarm. "ATG" shall be used to refer to all electronic UST monitoring systems whether they have an automatic tank 11.Measure the distance from the bottom of the gauge probe or are solely an electronic alarm for sensors probe to the fuel float when the float first trig- installed."ATG"is a general industry term that is used to gers the alarm. identify all electronic tank monitoring equipment. 1.2.On the tank chart, find the volume that corre- sponds to the height of the float and determine Before starting any testing,print out the system configu- the percent of tank capacity. ration on the ATG console (if equipped with a printer) and verify that site setup parameters are correct. Make Use this formula to determine the percent of sure that the sensors are correctly labeled to indicate their tank capacity at which the alarm was triggered: location. Percent Tank Capacity = (product volume Keep completed compliance tests on file to confirm that when 90 percent alarm triggered/total tank during the test: volume)x 100 • the system was continuously powered and monitored 13.Clear the alarm condition. for the data collection period; 14.Compare the measurements in Steps 11 and 12 . tank probes and leak sensors were functioning properly. to the values programmed into the console. 15.Reinstall the ATG probe. _ 7.3.7 Pass/Fall Crlterla. • If the overfill alarms)activates when the tank is no more than 90 percent full, the overfill alarm passes the test. ro5c+ O • If the fuel level on the console does not agree with the gauge stick reading,the system fails the _ test. ==— • If the overfill alarm(s) does not activate in the test mode,it fails the test. FIGURE 8-1. The indicator lights and the LCD display • If the overfill alarm(s) does not activate or acti- on the monitoring console show the status of the UST vates at any product level above 90 percent tank system. capacity,it fails the test. 8.2 ATG Probes. ATG probes continuously measure the product level in a UST using an in-tank probe con- nected to a console. To properly evaluate its condition, the probe needs to be removed from the tank and visually inspected. pei.org