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State Water Resources Control Board <br />Home Water Issues > Programs > Ust Leak Prevention Lg113 :> Misc <br />Page 1 of 2 <br />UST Program - LG 113 - ATG Maintence Checklist/Magnetostrictive and <br />Ultrasonic Probes <br />.................................................................................................................................................. <br />Magnetostrictive and Ultrasonic Probes <br />Minimum procedures to be conducted by a qualified service technician. <br />Has all input wiring been inspected for proper entry and termination, including testing for ground <br />faults? <br />Yes <br />No <br />Have the probe and sensors been checked for visible damage such as residue buildup, cracks, <br />or breaks? 1,2 <br />Yes <br />No <br />Has the accuracy of the level sensor been tested? 3 <br />No <br />Has the accuracy of the water sensor been tested? 4 <br />Yes No <br />Has the appropriateness of the high water level alarm setting been verified? 5 <br />Yes No <br />Are all alarms activated and functioning properly? <br />Yes No <br />Comments: <br />1. Damaged probes must be cleaned or replaced as appropriate. Probes used in heavier products such as waste <br />oil should be checked more frequently. Heavier products can leave deposits on the probe shaft and float <br />assemblies that may restrict the measurement capacity of the probe. <br />2. Because the magnetostrictive probe consists of moving parts, its sensors can be damaged by excessive <br />frictional wear as well as residue build-up. Residue build-up can affect the weight of the sensor as well as inhibit <br />its ability to slide freely along the guide tube. Inaccuracies in the product level measurements could indicate a <br />problem with the probe sensors. For additional testing of the probe sensors, perform the following test: <br />a. Remove the probe from the tank and place it carefully on the ground <br />b. Place the water sensor flush with the bottom of the probe shaft and place the product float near the <br />middle of the probe shaft. <br />c. Check the height reading on the tank gauge monitor (after allowing sufficient time for the monitor to <br />respond). Measure the distance from the bottom of the probe to the bottom of the product float and <br />compare it with the reading on the monitor. <br />3. To test the accuracy of the product sensor: <br />a. Using the tank console monitor, take an initial fuel level reading. <br />b. Dispense one gallon of product into a calibrated container. <br />c. Using the tank console monitor, take a second fuel level reading. <br />d. Verify that the change in tank volume is one gallon. <br />http://www.waterboards. ca.gov/water_issues/programs/ust/leak—Prevention/lg 113/misc/atg... 3/13/2009 <br />