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GroundingGrounding
Grounding
Megohmmeter Part No. 241079 (AA-see Fig.
16) 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 ammable
vapors in the area (such as open solvent
containers or fumes from spraying).
Failure to follow this warning could cause re,
explosion, and electric shock and result in serious
injury and property damage.
Graco Part No. 241079 Megohmmeter is available
as an accessory to check that the gun is properly
grounded.
1. Have a qualied electrician check the electrical
grounding continuity of the spray gun and air
hose.
2. Turn OFF (O) the ES On-Off switch.
3. Turn off the air and uid supply to the gun. Follow
the Pressure Relief Procedure, page 27.
4. Disconnect the uid hose.
5. Make sure the grounded air hose (AH) is
connected and the hose ground wire is
connected to a true earth ground.
6. 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. 16.
7. 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.
Figure 16 Check Gun Electrical Grounding
3A2494D25