Check Electrical Grounding

Fire, Explosion, and Electric Shock Hazard

Megohmmeter Part No. 241079 (AA-see FIG. 7.) 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, 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

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Fig. 7. Check Gun Grounding

Check Fluid Resistivity

Fire, Explosion, and Electric Shock Hazard

Check the fluid resistivity in a non-hazardous area only. Resistance Meter 722886 and Probe 722860 are not approved for use in a hazardous area.

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 megohm-cm, then a Pro Xs3 HC gun may be a better option. The Pro Xs WB gun is intended to spray very conductive waterborne materi- als and other materials less than 1 megohm-cm.

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