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i7 <br />Control Engineers, U.S.A. Page <br />Float Switches - Commonly constructed of a hermetically sealed magnetic relay <br />imbedded by float. <br />within a metal stem and actuated a surrounding <br />Conductivity Probe - Consist of two metal pins and associated electronics capable <br />of sensing the different electrical conductivity characteristics of water and <br />petroleum. <br />Light Refraction - Consist of light emitter, light receiver, and associated <br />electronics capable of detecting the presence of a liquid. When combined <br />with the Conductivity Probe the resulting probe is capable of detecting Dry, <br />■ <br />■ <br />Wet, and Hydrocarbon states. <br />Thermal Absorption - Electronic Sensor sensitive to heat loss when submerged in <br />liquid. When combined with the Conductivity Probe the resulting probe is <br />capable of detecting Dry, Wet, and Hydrocarbon states. <br />Product Soluble - Commonly constructed of two spring loaded electrical switches <br />each independently restrained by liquid sensitive filaments. One filament <br />dissolves in contact with water only, the other dissolves in contact with <br />petroleum. This probe is capable of detecting Dry, Wet, and Hydrocarbon <br />states. Obviously this probe is destroyed when tested. <br />Carbon Polymer - Consist of a rubbery belt and associated electronics capable of <br />detecting the existence of less than 0.0625 inch of hydrocarbon along any <br />portion of the belt length. <br />VAPOR DETECTORS - Due to the expense of installing and maintaining and <br />the poor performance record of this technology, its use will be allowed only <br />when required by local code. For this reason no review of this technology <br />will be presented. <br />Control Engineers, U.S.A. Page <br />