Check Electrical Grounding
Fire, Explosion, and Electric Shock Hazard
Megohmmeter Part No. 241079
•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, explo- sion, and 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 valve OFF.
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 grounded air hose (R) is connected and the hose ground wire is connected to a true earth ground.
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5.Measure the resistance between the gun handle (BB) and a true earth ground (CC). Use an applied voltage of 500 minimum to 1000 volts maximum. The resistance should not exceed 1 megohm. See FIG. 7.
6.If the resistance is greater than 1 megohm, 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.
Installation
BB
AA
CC
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Fig. 7. Check Gun Grounding
Check Fluid Resistivity
Fire, Explosion, and Electric Shock Hazard
Check the fluid resistivity in a
Failure to follow this warning could cause fire, explo- sion, or electric shock and result in serious injury and property damage.
Graco Part No. 722886 Resistance Meter and 722860 Probe are available as accessories to check that the resistivity of the fluid being sprayed meets the require- ments of an electrostatic air spray system.
Follow the instructions included with the meter and probe. If the material is above 1
312900G | 15 |