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11 ! WEATHERPROOF JUNCTION BOX (1 PER SENSOR) 1/2" RIGID CONDUIT ""�4 a TOFROM MONITOR SENSOR s Figure 36. Two -Wire Sensor Field Wiring Diagram. C. INSTALLATION OF FLOAT SWITCH — FIBERGLASS TANKS. 1. To ensure the sensor will reach the bottom of the annular space, the splice between the leader cable and the sensor must be 1 foot from the bottom of the riser pipe (see Figure 37, "Float Switch Installation — Fiberglass Tank"). First measure the sensor riser pipe from the bottom of the pipe to the top. Subtract one foot from the riser pipe measurement, then measure that distance up the leader cable from its connection to the sensor; mark the leader cable. CAUTION: DO NOT USE A KNIFE OR OTHER SHARP OBJECT TO MARK THE LEADER CABLE. MARK THE DISTANCE WITH A MARKER, TAPE, ORA TWIST TIE. 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 39; "Sensor Switch Position at Bottom of Tank Annulus"). 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 38, "Sensor Switch Position at Top of Tank Annulus"). .� NOTE: The sensor's float is designed with a bend to ® control direction of installation in your tank annulus. Red dots are painted on the top of the switch and 4 feet up the sensor, as position references during instal- lation. When installing the sensor, the switch will first appear to be upside-down, with the dot facing the bot- tom (see Figure 38). The switch will rest right-side-up at the bottom of the tank (see Figure 39, "Sensor Switch Position at Bottom of Tank Annulus"), with the refer- ence 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 provided at the end of the sensor for pull -cord installation (see Figure 38). Site Preparation and Installation nstructions EMC UST Monhori-anSystem 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 read 00 (continuity) at this point. If the meter reads 100kQ, the float switch is in the wrong position and must be re- installed correctly. 4. If the switch reads 00, 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 connecting the ohm meter to the two -wire cable. The ohm meter will read 100kn if the sensor is properly installed. 6. Secure the riser cap to the riser pipe. 7. Tighten the cable bushing nuts on the riser cap and junc- tion 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 36, ' wo- Wire Sensor Field Wiring Diagram). Since these are contact switches, polarity is not a consideration when connecting sensor wires to field wires. NOTE: SEAL WIRE NUT CONNECTIONS AT THIS TIME USING epoxy sealant, furnished with each sensor. WARNING: EPDXY SEALANT MAYBEIRRITATING TO EYES AND SKIN. MAY CAUSE SKIN SENSITI- ZATION IN SUSCEPTIBLE INDIVIDUALS. MAY BE SORBED THROUGH THE SKIN. EPDXY SEAL- ANT CONTAINS EPDXY RESIN AND VINYL CYCLO - HEXENE DIOXIDE. VINYL CYCLOHEXENE DIOX- IDE HAS CAUSED SKIN CANCER IN ANIMAL TESTS. PRECAUTIONS: AVOID EYE AND SKIN CONTACT. WEAR IMPERVIOUS GLOVES AND SAFETY GLAS- SES. USE ONLY IN WELL VENTILATED AREAS. IX" MINIMUM DIA MANHOLE 2 CORD GRIP SEALS SUPPLIED WITH SENSOR WEATHERPROOF JUNCTION BOX WITH lit INCH NPT THOS I16 CUBIC INCH MINIMUM) EPDXVSEaL PER NFPA SPEC TO PROBE JUNCTION BOX -2"REDUCER LEADER CABLE 2" DIA RISER SP ICE IFOOTFROM BOTTOM OF RISER PIPE SENSOR SENSOR SW ITCH MUST EACH BOTTOM OF TANK FIBERGLASS TANK NEE I.— WEW OF SENSOR SWITCH AI SOTI0M OF IAN. Figure 37. Float Switch Installation — Fiberglass Tanks. 23