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LJ <br />The Magneto-Strictive Tank Level Gauge is the most widely used in the U.S. *. <br />consists of a probe head, containing the electronics, a shaft (brass c <br />stainless steel), which extends across the diameter of the tank two float <br />one for product and one for water, and temperature sensors, usually 3 to <br />located within the shaft. This probe continuously transmits to the SOC tI <br />current level of the product, level of water, and the temperature of eac <br />sensor. <br />The operation of the probe is as follows: <br />The probe electronics sends an electrically induced wave down the shaft (waN <br />guide). A magnet located within the product float reflects part of this aN <br />f <br />7 <br />back up the shaft to the probe head. By recording the time required � 0 r tlI <br />wave to travel to the float and back the distance to the float Oevel) j <br />calculated. The portion of the wave not reflected by the product floi <br />magnet continues down the wave guide and is similarly reflected by tb <br />water float. <br />Tle text7eYzY-1re-seT-s(tx- 2re v,-t4Y-metAs2lly--,7aceY- al'tig tyle sy-Aft AT -Y- are- wvirz- <br />to the probe head electronics. <br />Level precision is 0.001 inch; temperature precision is 0.1 degree F. <br />The gauge is connected to the SOC via a special cable. The SOC continuous] <br />monitors the gauge to record product inventory and deliveries. The SOI <br />also can use the gauge information to run a statistical test on the tank ti <br />detect leaks. These tests usually require approximately 2 hours of n <br />product movement, depending on tank level. New SOC units automaticall <br />abort tank tests when a sale is begun and re-initiate the tests when tb <br />pump stops. This ensures that on every occasion of sufficient "quiet time" <br />tank test will be accomplished. <br />Control Engineers, U.S.A. Page 13 <br />