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Figure 51. Dual -Float Hydrostatic Sensor Dimensions. Figure 52. Typical Hydrostatic Sensor Installation. ;QW10 11W441111ilill 1�aWONTM111) loll M1FQWt4: A, 1H D. INSTALLATION OF DUAL -FLOAT HYDRO- STATIC SENSOR (Part No. 794380-302). (See Figure 52, "Dual -Float Hydrostatic Sensor Dimensions.") 1. Submerge the sensor until it rests on the top of the tank (see Figure 52, "Typical Hydrostatic Sensor Installation"). •NOTE: For Dual -Float Hydrostatic Sensors, the ideal brine solution level is approximately halfway between the high and low water floats. WiNOTE: Brine level in reservoir will be at its highest when the fuel tank is full of product, and at its lowest when the tank is empty. With the Dual -Float Sensor resting on the inner -tank wall, the sensor will alarm when the brine level is below 11/2" or when the brine level is above 121/2". Refer to the tank manufacturer's instructions for setting the proper brine level. 2. Secure the sensor using the cord grips. 3. Secure the lockable riser cap to the riser pipe. 4. Tighten the cord grip to secure the sensor in position on the riser cap and on the junction box to ensure a water -tight seal at the cable entry. E. INSTALLATION OF SINGLE -FLOAT HYDRO- STATIC SENSOR (Part No. 794380-301). (See Figure 53, "Single -Float Hydrostatic Sensor Dimensions.") 1. Submerge the sensor until it rests on the top of the tank, and mark the cable position at the riser cap. 2. Poll the sensor up until it triggers an alarm. Mark the cable position at the top of the cap. 3. Submerge the sensor until top of the riser cap is halfway between the marks on the cable. 4. Secure the sensor using the cord grips. 5. Secure the lockable riser cap to the riser pipe. 6. Tighten the cord grip to secure the sensor in position on the riser cap and on the junction box to ensure a water -tight seal at the cable entry. NOTE: Refer to the tank manufacturer's instruc- tions for setting the proper reservoir brine level. _14' MINIMUM DIAL CONCRETE SLAB OR PACKED EARTH LOCKING HANDLE MANHOLE WEATHERPROOF JUNCTION BOX WITH / PER NFRA 80 AD.IUSTABLE CORD GRIP SEAL NPT INCH IN IC CH THDS. LEAD CABLE SUPPLIED WITH MINIMUM) BOX R FITTING 0 VENT 1.25"WATER-TIGHT SEAL CLEAR PLASTIC EPDXY SEAL CASING 6.0" PER NFPA RISER PIPE CAP SPEC. VENTTUBE' LEVEL SWITCH TO PROBE JUNCTION BOX RISER PIPE CAP RISER PIPE DUAL POINT HYDROSTATIC SENSOR FRP RESERVOIR HIGH LEVEL ALARM FLOAT LOW LEVEL ALARM FLOAT DOUBLE-WALL TANK CAUTION: VENT TUBE MUST REMAIN CLEAR. IF VENT TUBE IS BLOCKED, DAMAGE MAY OCCUR TO THE TANK Figure 52. Typical Hydrostatic Sensor Installation. ;QW10 11W441111ilill 1�aWONTM111) loll M1FQWt4: A, 1H D. INSTALLATION OF DUAL -FLOAT HYDRO- STATIC SENSOR (Part No. 794380-302). (See Figure 52, "Dual -Float Hydrostatic Sensor Dimensions.") 1. Submerge the sensor until it rests on the top of the tank (see Figure 52, "Typical Hydrostatic Sensor Installation"). •NOTE: For Dual -Float Hydrostatic Sensors, the ideal brine solution level is approximately halfway between the high and low water floats. WiNOTE: Brine level in reservoir will be at its highest when the fuel tank is full of product, and at its lowest when the tank is empty. With the Dual -Float Sensor resting on the inner -tank wall, the sensor will alarm when the brine level is below 11/2" or when the brine level is above 121/2". Refer to the tank manufacturer's instructions for setting the proper brine level. 2. Secure the sensor using the cord grips. 3. Secure the lockable riser cap to the riser pipe. 4. Tighten the cord grip to secure the sensor in position on the riser cap and on the junction box to ensure a water -tight seal at the cable entry. E. INSTALLATION OF SINGLE -FLOAT HYDRO- STATIC SENSOR (Part No. 794380-301). (See Figure 53, "Single -Float Hydrostatic Sensor Dimensions.") 1. Submerge the sensor until it rests on the top of the tank, and mark the cable position at the riser cap. 2. Poll the sensor up until it triggers an alarm. Mark the cable position at the top of the cap. 3. Submerge the sensor until top of the riser cap is halfway between the marks on the cable. 4. Secure the sensor using the cord grips. 5. Secure the lockable riser cap to the riser pipe. 6. Tighten the cord grip to secure the sensor in position on the riser cap and on the junction box to ensure a water -tight seal at the cable entry. NOTE: Refer to the tank manufacturer's instruc- tions for setting the proper reservoir brine level. Figure 53. Single -Float Hydrostatic Sensor Dimensions. 33 SENSOR RISER CAP LOCKING HANDLE CORD GRIP AD.IUSTABLE CABLE TO LEAD CABLE JUNCTION BOX LIQUID TIGHT FITTING 0 VENT 1.25"WATER-TIGHT SEAL CLEAR PLASTIC CASING 6.0" RISER PIPE CAP LOW LIQUID LEVEL SWITCH Figure 53. Single -Float Hydrostatic Sensor Dimensions. 33