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The Optic/Conductivity Probe consist of several elements; plastic prism, light <br />emitter, light receiver, two metal conductivity pins, and required <br />electronics. <br />The light emitter, located within the prism as shown, continuously emits a light <br />beam which is refracted off the oblique surfaces of the prism into the light <br />receiver. This occurs only when the oblique surface of the prism is in an air <br />environment (not submerged in liquid). Upon sensing light, the light <br />receiver triggers the electronics identifying a "dry" state. This is the <br />normal state for the probe and this status is continuously monitored by the <br />SOC. <br />When any liquid, water or fuel, covers the prism surface, the light beam is <br />refracted or deflected away from the light receiver. Refraction occurs as the <br />light energy passes obliquely from one medium (plastic) to another <br />medium (air or liquid) in which its velocity is changed. The probe is <br />designed to deflect the light into the receiver when exposed to air. When <br />submerged in liquid, the change in density from that of air to the density of <br />the liquid, changes the light path and directs it away from the receiver. <br />Upon not sensing light, the light receiver triggers the electronics, <br />identifying a "wet" state. <br />Due to the polar nature of water, the conductivity pins can distinguish between <br />water and fuel by measuring the flow of electrical current through the <br />liquid. The SOC then logically evaluates the "wet"/"dry" status of the optic <br />signal and "water"/" fuel" status of the conductivity pins to determine the <br />region status. <br />Control rgr,.. P,,. 12 <br />