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Installation
312900G 15
Check Electrical Grounding
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.
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
F
IG. 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.
Fig. 7. Check Gun Grounding
Check Fluid Resistivity
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.
Fire, Explosion, and Electric Shock Hazard
Megohmmeter Part No. 241079 (AA-see F
IG. 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.
ti1259a
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.
ti1274a
AA
BB
CC