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C <br />Interstitial Liquid Sensor Installation Guide Installation of Float Switch <br />Red Reference Dot <br />(facing up) <br />Pull Cord Eyelet <br />sensorsUntssbt.eps <br />Bottom of tank annulus <br />Figure 3. Correct sensor orientation at bottom of tank annulus. <br />An eyelet has been provided at the end of the sensor for pull -cord installation (see Figure 2). <br />1. Feed the sensor into the riser pipe until the sensor reaches the top cavity of the tank and rests at the beginning of the <br />annulus, as shown in Figure 2. <br />2. Before continuing, verify correct switch orientation by connecting an ohm meter to the two -wire cable of the <br />interstitial sensor. The ohm meter should read 0 ohms (continuity) at this point. If the meter reads l 00k ohms, the <br />float switch is in the wrong position (red dot is up) and must be removed and flipped over. <br />3. If the switch reads 0 ohms (red dot is down), continue to feed the switch into the annular space, until the switch <br />reaches the bottom of the tank (the splice between the sensor and leader cable should be 1 foot from the bottom of the <br />riser pipe.) <br />4. Verify the switch is in the correct position by re -checking the ohm meter reading. The ohm meter will read 100k ohm <br />if the sensor is properly installed. <br />5. Secure the riser cap to the riser pipe. <br />6. Tighten the cable bushing nuts on the riser cap and junction box to ensure a water -tight seal at the cable entry. <br />7. Using wire nuts, connect the two -wire sensor cable to the field wires in the sensor junction box (Figure 4). You do <br />not have to observe polarity for this sensor. <br />To ® Black <br />Interstitial <br />Sensor i Seal -off From <br />Interface i i i Red Sensor <br />Module i • <br />�1/2" rigid �J <br />conduit I <br />Epoxy sealed connections in a <br />senso syssnao-.eps weatherproof junction box <br />Figure 4. Sensor Field Wiring Diagram <br />5 <br />