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monftml Effective Hydrostatic MonitoringMonitori1ng the Tank with a ; Systems for Xerxes Double Wall Tank Reservoir Probe Xerxes double wall tanks may be monitored with a variety of The accurate monitoring of the primary and secondary tank systems.Each monitoring mode-depending on the eco- walls is accomplished through the use of an electronic sensor nomics of the installation-is designed to detect a leak in and the tank-mounted hydrostatic reservoir. either the primary or secondary tank as well as the attached collar riser. Should an installation require maximum round-the-clock mon- itoring of tanks and attached collar risers, the single-control unit is pre programmed to effectively monitor up to a four- tank installation,with a four-channel control panel. (An eight- channel control panel is available as an option.) 0colimm Pu{L ea: Typical three-tank installation with control panel individually monitoring the With the interstitial space and reservoir factory-fllled with attached collar risers and tanks. liquid to a predetermined level, a hydrostatic pressure is applied to the inner and outer tank walls. If a leak should ever occur in the inner tank, the liquid level in Controller/Monitor the reservoir will drop as monitoring fluid drains into the pri- mary tank.Should a leak develop in the outer wall, the moni- toring fluid will drain into the excavation and again lower the The control unit provides LED's(indicator lights)to show the level of monitoring fluid.Should a leak occur in the outer wall individual operating condition of each tank and riser in the during high-groundwater conditions, the level of the monitor- installation.The unit is also equipped with an audible alarm ing fluid will rise as outside water seeps into the interstitial and may be located up to 500'from the installation space. In any of these situations, a change in the liquid level beyond the acceptable limits will activate the alarm. Control Unit (Four-Channel Panel Shown) The controller is also equipped with a test switch to prove the - system functional.The control panel is weather-resistant. .tics •awc AC Knockout - ! o c Power(green)-The system is operating properly ,,. ®®r Fault(yellow) :- The system has an internal mal nction. ® Key Lock warm(red) —The alarm light,plus an audible warning,will indicate that one or more of •� • 0 the sensors is in an alarm condition. Relay f i Test Button Knockout _ _j (Eight channel unit also available.) -1J 0 o The electronic monitoring system is listed by Underwriters Laboratories,Inc. The monitor probes for the reservoir and riser sensors are intrinsically safe for Sensor Knockouts use in hazardous locations Class 1,Group C and D.Division t and 2 as defined by the National Electrical Code. 14