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To monitor the unwanted presence of liquid inside the riser, an optional electronic sensor is mounted at a specified position on the wall of the attached manway riser. The unit permits continuous electronic monitoring through the Xerxes supplied control panel. The solid state sensing probe consists of a liquid level sensing element which is activated when a liquid rises to a predetermined and unacceptable level in the riser. The level is sensed and converted to a voltage output which in turn activates the alarm system. Installation The manufacturer's instruction manual, covering installation, operation and maintenance of the Xerxes supplied tank monitoring system, is available from your Xerxes sales representative. A copy of the manual will be sent with each unit. Note that the monitoring system must be installed in accordance with the manufacturers instructions and all federal, state and local laws and regulations. Failure to follow these instructions, laws and regulations may impair instrument performance and will void the manufacturer's warranties and approvals. Only Xerxes supplied replacement parts are to be used. The platform allows for a monitoring system connection through the 4" fitting farrow). Wet Interstitial Space Manually Checking Tank Integrity with a Hydrostatic Reservoir During ;piping, a 4"' PVC riser pipe is fastened to the fitting atop the reservoir. This will be cut to a level below a street box and secured with a threaded cap. The reservoir liquid level and the tank's integrity can then be visually checked with a dipstick. (A liquid level of 6" from the tank top should be maintained ) In the unlikely event of a tank leak, the liquid will drain from the reservoir. If the leak is in the interior wall, the monitoring fluid will drain into the primary tank and can Street Box be detected with ao: a r-1 , A*; M water -finding paste at Concrete Pad •' If Xerxes' tanks are ; the tank's bottom.I Ground• Sensor wire Hydrostatic Monitor, the Riser Pipe Should a leak occur in ' Riser Pipe and secondary tank walls the outer wall, theTape monitored through a 4" measure or monitoring fluid willrt end of tanks of 3,000 dipstick also drain from the Re Primary Tank reservoir and intersticeLiquid installed on 550; 1,000 into the gravelLevel and 2,500 gallon capacity Interstitial Space environment, No waterwill access to the tank bottom be detected in theprimary through the tank.Tank ribs—open to the "The liquid level in the reservoir will fluctuate with the temperature differential of incoming product. The reservoir is designed to provide adequate capacity for normal thermal expansion and contraction. Dry Interstitial Space An Alternative to the Hydrostatic Monitor •' If Xerxes' tanks are purchased without the Ground• Sensor wire Hydrostatic Monitor, the integrity of the primary ' Riser Pipe and secondary tank walls may be physically monitored through a 4" fitting installed on each end of tanks of 3,000 Secondary Tank gallon capacity and Primary Tank above. (A single fitting is installed on 550; 1,000 Liquid Sensor in and 2,500 gallon capacity Interstitial Space tanks.) By providing access to the tank bottom through the circumferential end ribs—open to the interstitial space—a liquid sensor, or a vacuum or air pressure monitoring system may be used.