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g 1% Monitoring the Tank with a <br />Tank Reservoir Probe <br />variety of The accurate monitoring of the primary and secondary tank <br />ie eco- walls is accomplished through the use of an electronic sensor <br />eak in and the tank -mounted hydrostatic reservoir. <br />attached <br />clock mon- <br />control <br />a four - <br />(An eight - <br />Loring the <br />show the <br />er in the <br />-)le alarm <br />prove the <br />istant. <br />With the interstitial space and reservoir factory -filled with <br />liquid to a predetermined level, a hydrostatic pressure is <br />applied to the inner and outer tank walls. <br />If a leak should ever occur in the inner tank, the liquid level in <br />the reservoir will drop as monitoring fluid drains into the pri- <br />mary tank. Should a leak develop in the outer wall, the moni- <br />toring fluid will drain into the excavation and again lower the <br />level of monitoring fluid. Should a leak occur in the outer wall <br />during high -groundwater conditions, the level of the monitor- <br />ing fluid will rise as outside water seeps into the interstitial <br />space. In any of these situations, a change in the liquid level <br />beyond the acceptable limits will activate the alarm. <br />Power (green) — The system is operating properly. <br />Fault (yellow) — The system has an internal malfunction. <br />