Assessments - 4, GPA: 4.5
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3. Electrostatic Air Spray Gun: ground the gun by connecting the Graco Electrically Conductive Air Hose and connecting the air hose ground wire to a true earth ground. Check the electrical grounding of the gun as instructed on page 9. 4. All air and fluid lines must be properly grounded. Use only grounded hoses with a maximum of 500 feet (150 m) combined hose length to ensure grounding continuity. 5. All electric cables must be properly grounded. 6. All persons entering the spray area: their shoes must have conductive soles, such as leather, or personal grounding straps must be worn. Rubber or plastic soles are not conductive. The operator must not wear gloves that insulate the hand from the spray gun. The gloves must be conductive or modified as shown in Fig. 3, page 11. 7. Object being sprayed: keep the workpiece hangers clean and grounded at all times. Contact points must be sharp points or like knife edges. 8. The floor of the spray area: must be electrically conductive and grounded. Do not cover the floor with cardboard or any non-conductive material which would interrupt grounding continuity. 9. Flammable liquids in the spray area: must be kept in approved, grounded containers. Do not store more than the quantity needed for one shift. 10. All electrically conductive objects or devices in the spray area: including fluid containers and wash cans, must be properly grounded. 8 307912 Installation Check the Electrical Grounding (See Fig. 2) b. If using a red turbine air hose, use an ohmmeter to measure the resistance. Resistance should not exceed 100 ohms. WARNING FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD Megohmmeter P/N 241079 (AA-see Fig. 2) is not approved for use in a hazardous area. To reduce the risk of sparking, do not use the megohmmeter to check electrical grounding unless: . The gun has been removed from the hazardous area; . Or all spraying devices in the hazardous area are turned off, ventilation fans in the hazardous area are operating, and there are no flammable vapors in the area (such as open solvent containers or fumes from spraying). Failure to follow this warning could cause fire, explosion, electric shock and result in serious injury and property damage. 1. Have a qualified electrician check the electrical grounding continuity of the spray gun and air hose. 2. Turn the ES ON-OFF Lever to OFF. See Fig. 4, page 12, for the location of the lever. 3. Turn off the air and fluid supply to the gun. The fluid hose must not have any fluid in it. 4. Make sure the air hose (R) is connected and the hose ground wire is connected to a true earth ground. 5. Measure the resistance between the gun handle (BB) and a true earth ground (CC). a. If using a black or grey air hose, use a megohmmeter (AA) to measure the resistance. Use an applied voltage of 500 minimum to 1000 volts maximum. The resistance should not exceed 2 megohms. 6. If the resistance is greater than the maximum reading specified above for your hose, check the tightness of the ground connections and be sure the air hose ground wire is connected to a true earth ground. If the resistance is still too high, replace the air hose. R AA BB CC 0644B Fig. 2 307912 9 Notes 10 307912 Operation Pressure Relief Procedure Operating Checklist WARNING Check the following list daily, before starting to operate the system, to help ensure safe, efficient operation. PRESSURIZED EQUIPMENT HAZARD The system pressure must be manually relieved to prevent the system from starting or spraying accidentally. To reduce the risk of an injury from electric shock, accidental spray from the gun, splashing fluid, or moving parts, follow the Pressure Relief Procedure whenever you: are instructed to relieve the pressure, stop spraying, check or service any of the system equipment, or install or clean the fluid nozzle. 1. Turn the ES ON–OFF Lever to OFF. 2. Turn off the air and fluid supply to the gun. 3. Trigger the gun into a grounded metal waste container to relieve fluid pressure. 4. Open the pump drain valve, having a waste container ready to catch the drainage. 5. Leave the pump drain valve open until you are ready to spray again. Filter the Fluid Filter the fluid to remove coarse particles and sediment which could clog the spray nozzle. 3 in. (76 mm) square cut out and finger of glove cut off NOTE: If gloves are worn, they must be conductive or modified as shown so they do not interfere with operator grounding through the gun. ____ 1. All the operators are properly trained to safely operate an electrostatic air spray system as instructed in this manual. ____ 2. All the operators are trained how to properly relieve pressure as instructed at left. ____ 3. The system is thoroughly grounded and the operator and all persons entering the spray area are properly grounded. See Ground the System, page 8. ____ 4. The operator is not wearing gloves which insulate the hand from the spray gun. If worn, gloves must be conductive or modified as shown in Fig. 3 so as not to int...
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