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4 -rrl7 GILDARCO TANK MONITOR SYSTEM OVFRVIEw The Gilbarco Tank Monitor is a precision Instrument that measures product levels In petroleum underground storage tanks. it consists of a console , which is mounted Indoors, and aprobe which Is mounted inside each tank to be monitored. One console can handle up to 8 probes. The console , which has a very powerful microprocessor, contains all the programming necessary to communicate with the probes . The console is connected to each probe by a coaxial cable. Each probe contains .ten ultrasonic transducer located near the lower end and a series of calibre' lon reflectors running along the length of the probe . The ultrasonic (h; gh frequency sound) transducer can be thought of as a submerged microphone . The Tank Monitor actually measures time . It measures the time It takes the ultrasonic sicnal to cc from the transducer (bottom of the tank) to the su*face of the fuel , the reflectors which are set at precise intervals along the lenoth of the probe are used to calculate velocity Of the signal , therefore, by knowing velocity end time elapsed, the Tank Monitor can eeternlne the distance (or height of the fuel ) using the formUla Distance m Velocity x Time. P.fter installation and power-up , the operation Of the Task Monitor 15 aUt OmatiC . There Is no further equipment sot up or operator involvement required to make fuel level change measurements. II . SUMMARY OF PERFOkMANCE Height Measurement Precision The Tank Monitor Is designed to measure fuel level change within a standard deviation of less than .01 gallons in a half filled 10,000 gallon tan(:. Tests documenting this performance were conducted by simulating minute fuel level increases and decreases In a test tank. This was done by Insertirc a dlsplacer of a known volume into the fuel for 2 minutes and removing It fcr 2 minutes over a 2 hour period. The process was repeated using variouS size dlsplacers . These tests were Conducted under the direction of an Independent research firm, Vista Research of Palo Alto, Cal . A summery of their anal�si5 is shown on Attachment I .