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® Site Preparation and IngWation Instructions ® TLS -350 UST MonitorinjWstem ",I NOTE: To ensure proper operation of the float switch, it is important that you order and install the correctly sized sensor in your fiberglass tank This ensures the float switch will rest as close as possible to the bottom of the tank annulus (see Figure 47, "Sensor Switch Position at Bottom of Tank Annu- lus"). 2. Feed the sensor into the riser pipe until the sensor reaches the top cavity of the tank and rests at the beginning of the annulus (see Figure 46, "Sensor Switch Position at Top of Tank Annulus"). �I NOTE: The sensor's float is designed with a bend to control direction of installation in your tank annu- lus. Red dots are painted on the top of the switch and 4 feet up the sensor, as position references during installation. When installing the sensor, the switch will first appear to be upside-down, with the dot facing the bottom (see Figure 46). The switch will rest right-side-up at the bottom of the tank (see Figure 47), "Sensor Switch Position at Bottom of Tank Annulus"), with the reference dots facing in toward the tank. NOTE: Pull -Cord Installation Method.To ensure proper installation of the sensor using a pull cord, the reference marking 4 feet up the sensor should face toward the pull cord. An eyelet has been pro- vided at the end of the sensor for pull -cord installa- tion (see Figure 46). 3. Before continuing, verify correct switch positioning by connecting an ohm meter to the two -wire cable of the interstitial sensor. The ohm meter should indicate 052 Figure 45. Float -Switch Type Interstitial Sensor Installation - Fiberglass Tanks. 30 (continuity) at this point. If the meter reads 100kQ, the float switch is in the wrong position and must be reinstalled correctly. 4. If the switch indicates 052, continue to feed the switch into the annular space, until the switch reaches the bottom of the tank (the splice between the sensor and leader cable should be 1 foot from the bottom of the riser pipe). 5. Verify the switch is in the correct position by connect- ing the ohm meter to the two -wire cable. The ohm meter will indicate 100kQ if the sensor is properly installed. 6. Secure the riser cap to the riser pipe. 7. Tighten the cord grips on the riser cap and junction box to ensure a water -tight seal at the cable entry. 8. Using wire nuts, connect the two -wire sensor cable to the field wires in the sensor junction box (see Figure 44, "Two -Wire Float -Switch Sensor Field Wiring Diagram"). Since these are contact switches, polarity is not a consideration when connecting sensor wires to field wires. 9. Seal wire nuts with epoxy sealant using one bag for two wire nut connections. (Refer to Figure 26, "Epoxy Sealant for Two -Wire Connections.") PULL -CORD EYELET POSITION REFERENCE DOT (RED) POSITION o REFERENCE DOT (RED) 4 FEET FROM SENSOR SWITCH PULL CORD Figure 46. Sensor Switch Position at Top of Tank Annulus. Figure 47. Sensor Switch Position at Bottom of Tank Annulus