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RECEIVEC <br /> OCT 0 9 2015 <br /> WCt) rU <br /> A simplified Veeder-Root Vacuum Sensor system installation in an STP sump is shown in Figure 1. <br /> Seal off STP <br /> Barbed fitting In siphon <br /> port for vacuum source <br /> To console a-- <br /> s Product Tina <br /> Dual weatherproof Junction vacuum fitting <br /> boxes wtcord grip wiring <br /> entries containing epoxy <br /> sealed corinections <br /> 14 <br /> Double wall sump ............ return line <br /> . ..... ....... Vapor <br /> vacuum fitting* .. vacuum fitting <br /> if mutttple ports are provWd a <br /> in the sump waft,160aft <br /> vacuum fitting in lowest one. <br /> Double wall tank ...a:::: l <br /> Wiring from sensor in Tank irrterstifial <br /> tank interstice connects sensor vacuum fitting Four Vac Sensor <br /> to vac sensor In 3 box Housing Assembly <br /> bracketed to riser <br /> t <br /> Figural. Four Vacuum Sensor Assembly wfrank interstitial Sensor Installation Example <br /> A functional diagram of a Vae Sensor system is shown in Figure 2.The TLS Console turns the pump on,opens the, <br /> vacuum control valve(in Vac Sensor),and then monitors the pressure sensor(in Vac Sensor). <br /> Under normal operation,when the vacuum reaches either 1 psi above the entered relief valve pressure(relief valve <br /> installed),or-8 psi (no relief valve installed),unless the rate of evacuation decreases to less than 0.1 gpm,the <br /> console closes the vacuum control valve and turns off the pump.Thereafter,the console continues to monitor the <br /> pressure sensor for signs of a decrease in vacuum(leak)and the liquid float for the presence of a liquid in the <br /> vacuum line. <br /> 1n the event of a decrease in vacuum the console turns on the pump in an attempt to restore the vacuum.Small <br /> leaks will be maintained by these periodic evacuations.If the system calculated leak rate exceeds approximately 25 <br /> gph a Vac Warning will be posted. <br /> The console also monitors the liquid float in the Vac Float module or tank interstice and will post a High Liquid <br /> Alarm if enough liquid accumulates in the vac line liquid reservoir to lift the float. <br /> 2 <br />