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Vacuum Sensor System Installation Guide Field Assembling Vac Sensor/Vac Float modules — STP Vac Sensor houain8fa---8.28—) Tension damp 8.828" 12"Min.. Support bracket qRiser Sump From View SIDS VIew Figure 2. Vac Sensor Assembly Dimensions Field Assembling Vac Sensor/Vac Float modules If you are field assembling the Vac Sensor/Vac Floats into the Vac Sensor housing continue to Step 1.If you are installing the pre-assembled 2,3,or 4 Vac Sensor kit go to"Installing Vac Sensor Housing Support Bracket"on page 6. 1. Get the Vac Sensor module with bracket from each of the secondary piping vacuum monitoring system kits. If a tank interstice is being monitored,also get the Vac Sensor module with bracket from that kit. 2. Get the Vac Sensor housing from the mounting kit and attach each of the Vac Sensors(up to 4)to the top of the housing using #10 x 3/8"self-tapping screws as shown in Figure 3.The Vac Sensor covers should be to the left in the installed position with the STP Siphon port facing the front of the housing. 3. Get the Vac Floats and#10 x 3/8"self-tapping screws from the secondary piping vacuum monitoring system kits. Up to three Vac Floats can be attached to the housing as shown in Figure 3-there is no Vac Float for a Vac Sensor monitoring the tank interstice.If you are using only one or two Vac Floats, attach them to positions shown in the figure, preferably under a Vac Sensor(s). 4. Get the 1/4" ID tubing and the barbed elbows from the secondary piping vacuum monitoring system kits(1 for each Vac Sensor and 2 for each Vac Float). Get the tapered bushings and nuts for the Vac Sensor and Vac Float vacuum ports (2 for each Vac Sensor and 2 for each Vac Float) (ref. Figure 4). Insert the tapered end of the bushing into the port then loosely screw on the nut.Repeat this step for each vacuum port. 5. Insert a barbed elbow in the bottom bushing of one of the Vac Sensors and install an elbow in the rear bushing of the nearest Vac Float (preferably the one directly under it). Orient the elbows as shown in the figure,then tighten both bushing nuts.Cut a piece of the 1/4"tubing and connect the elbow in the Vac Sensor to the elbow in the Vac Float.Keep the connection kink free and as short as possible (see Figure 4). Install a barbed union in the other vacuum port of the Vac Float and tighten the bushing nut. Repeat this procedure for each additional Vac SensorNac Float pair. 6. Get the barbed tees,and the barbed elbow from the secondary piping vacuum monitoring system kits. 7. Looking at the front of the Vac Sensor housing, insert the elbow in the side vacuum port bushing labeled STP Siphon (on the Vac Sensor cover) in one of the Vac Sensors closest to the side of the housing. Orient the elbow so that the open half is horizontal and pointing to the other Vac Sensors. Insert a tee in the same vacuum port in each of the other Vac Sensors.Orient the tees in the horizontal position,except the Vac Sensor closest to the other side of the Vac Sensor housing. Remove this tee and orient it so that one end points toward the other tees and one end points out at you then insert the inlet end into the bushing. Measure and cut a pieces of the tubing to connect each of the tees and elbow as shown in Figure 6. Once the tubing pieces are cut, remove the barbed elbows and tees to push on the tubing pieces,then reinsert this connected assembly back into the Vac Sensor bushings and tighten the nuts (ref. Figure 6). 4