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0 <br />C <br />C <br />C <br />r_ <br />f' <br />r. <br />J <br />n <br />L� <br />Dispenser Sumps are becoming more common throughout the U.S. In fact, the <br />state of Florida now requires them in new construction. With the installation <br />of these sumps comes the added potential risk of collecting fuel near the <br />public. Placing discriminating probes in all dispenser sumps allows for the <br />detection of water to be declared as a low priority, local event, while the <br />detection of fuel would create a high priority alarm with optional shutdown <br />of the dispenser and/or the respective pump. <br />The probe shown uses carbon polymer technology combined with a float switch to <br />distinguishing between wet, dry, and hydrocarbon states in the sump. As <br />stated earlier, the carbon polymer probe consist of a rubbery belt and <br />associated electronics which is capable of detecting 0.0625 inch of <br />hydrocarbon along any portion of the belt length. When the integral float is <br />activated and the belt has not sensed fuel, then the SOC declares the <br />detection of water. The activation of the float and the belt indicate fuel. The <br />advantages of this probe are: insensitive to hydrocarbon vapor, <br />automatically resets after being exposed to liquid fuel, not affected by ice <br />(will detect fuel above ice layer), simple construction, high reliability. <br />An elongated version of this probe can be used in the turbine sump. <br />Control Engineers, U.S.A. <br />