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Glossary <br /> 10 <br /> MDIM Mechanical Dispenser Interface Module. <br /> magnetostriction The change in the dimensions of a ferromagnetic body caused by a change in its state of <br /> magnetization. <br /> modem MOdulator-DEModulator;a unit that modulates and demodulates digital information from a <br /> terminal or computer port to an analog carrier signal for passage over an analog line. <br /> module An electronic component that plugs into the console to perform a special function <br /> NEC National Electrical Code; a nationally accepted guide for the safe installation of electrical con- <br /> ductors and equipment. <br /> NFPA National Fire Protection Association;a nonprofit organization dedicated to protecting lives <br /> and property from the hazards of fire.NFPA publishes over 270 nationally recognized codes <br /> and standards,including the National Electrical Code. <br /> PLLD Pressurized Line Leak Detection <br /> PROM Programmable Read Only Memory <br /> probe A device used to measure temperature and product and water levels in a tank,and transmit <br /> that data to the console. <br /> RAM Random Access Memory <br /> ROM Read Only Memory <br /> sensor A device that responds to a physical stimulus(e.g., pressure,magnetism,or a particular <br /> motion)and transmits a resulting impulse(as for measurement or operating a control). <br /> surface-mount A printed circuit board which has component leads soldered on its surface(face). <br /> board <br /> through-hole A printed circuit board which has component leads going through holes in the board for sol- <br /> mount board dering on the back side. <br /> tri-state sensors Tri-state sensors are piping sump sensors and steel and fiberglass tank interstitial sensors.The <br /> three conditions of this sensor are normal,fuel alarm,or sensor out. <br /> UST Underground Storage Tank <br /> 95% Ullage Amount of product required to fill a tank to 95% of capacity. <br /> Ullage Amount of empty space in a tank <br /> VLLD Volumetric Line Leak Detection <br /> Vapor A substance in the gaseous state as distinguished from the liquid or solid state. <br /> volumetric A method of detecting leaks in pressurized piping. <br /> WPLLD Wireless Pressurized Line Leak Detection <br /> Glossary-3 <br />