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Site Preparation and Installati nstructions EMC UST Monitoring System WEATHERPROOF JUNCTION BOX (t PER PROBE) t/2" RIGID CONDUIT i glk • TO FROM MONITOR PROBE • + Wht Figure 34. Two -Wire Probe Field Wiring Installation Diagram. 7. Carefully lower probe into the riser pipe until the boot rests on the bottom of the tank. 10 CAUTION: DO NOT ALLOW PROBE TO FREEFALL AND/OR SHARPLY IMPACT THE BOTTOM OF THE TANK. SHOCK TO THE PROBE FOOT WILL RESULT IN SEVERE PROBE DAMAGE. 8. Feed the two -wire probe cable (furnished with each probe) up through the cap bushing and in through the junction box bushing. Leave enough slack in the cable between the cap and junction box to allow the cap to easily reach the riser pipe. In addition, leave enough slack under the riser cap to permit connection to the probe and to allow the probe to rest on the bottom of the tank. 9. Using wiring nuts, connect the wires from the probe cable to the probe field wires in the junction box (see Figure 34, I'wo-Wire Probe Field Wiring Installation Diagram"). Be sure to observe proper polarity between the probe and monitor wiring during installation. The conduit must be properly sealed in accordance with the National Electrical Code (NFPA 70) and the Automotive and Marine Service Station Code (NFPA 30A) since they pass from a Class I, Division I or Division II area into a non -hazardous area. "`I NOTE: SEAL WIRE NUT CONNECTIONS AT THIS TIME USING epoxy sealant, furnished with each probe. WARNING: EPDXY SEALANT MAYBE IRRITATING TO EYES AND SKIN. MAY CAUSE SKIN SENSITI- ZATION IN SUSCEPTIBLE INDIVIDUALS. MAY BE ABSORBED 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. 10. Tighten the cable bushing nuts on the probe riser cap and junction box to ensure a water -tight seal at the probe cable entry. 11. Secure the riser locking cap to the top of the riser pipe. A padlock may be installed for added security. SECTION 7. INTERSTITIAL LIQUID SENSOR INSTALLATION A. EQUIPMENT PREPARATION. ,114 WARNING: TO AVOID ELECTRICAL SHOCK WHICH COULD KILL YOU, BE SURE AC POWER TO THE MONITOR IS OFF DURING INSTALLATION. 1. Turn OFF power to the EMC system. ,t NOTE: Do not install the sensor if any liquid is present "® in the annular space. Failure to comply will lead to an alarm. 2. Make sure no liquid is present in the annular space. 22 B. INSTALLATION OF FLOAT SWITCH — STEEL TANKS. 1. To be sure the sensor will reach the bottom of the annular space, first measure the sensor riser pipe from the bottom of the pipe to the top. Then measure the same distance up the leader cable from its connection to the sensing ele- ment and mark the leader cable. 16 CAUTION: DO NOT USE A KNIFE OR OTHER SHARP OBJECT TO MARK THE LEADER CABLE. MARK THE DISTANCE WITH A MARKER, TAPE, OR A TWIST TIE. 2. Lower the float switch assembly into the riser pipe until the float switch touches the bottom of the tank (see Figure 35, "Float Switch Installation — Steel Tanks"). 3. Keeping the cable taut, secure the sensor assembly in place by attaching the grip cord. NOTE: The float switch assembly must not hang by the "r cable, but should rest lightly on the bottom of the tank supported by the cable. 4. Secure the riser cap to the riser pipe. 5. Tighten the cable bushing nuts on the riser cap and junc- tion, box to ensure a water -tight seal at the cable entry. Figure 35. Float Switch Installation — Steel Tanks. 6. Using wire nuts, connect the two -wire sensor cable to the field wires in the sensor junction box (see Figure 36, "Two - Wire Sensor Field Wiring Diagram"). Since these are contact switches, polarity is not a consideration when connecting sensor wires to field wires. '�.I NOTE: SEAL WIRE NUT CONNECTIONS AT THIS ® TIME USING epoxy sealant, furnished with each sensor.