Graco 308075A Grounded Gun Air Supply Hose Adapter Owner's Manual

INSTRUCTIONS–PARTS LIST
308–075
Rev. A
This manual contains IMPORTANT
WARNINGS AND INSTRUCTIONS
READ AND RETAIN FOR REFERENCE
Grounded Gun
AIR SUPPLY HOSE ADAPTER
Part No. 185–493
For use with the electrostatic spray gun grounded air supply hoses. Allows conductive air hoses to be coupled
while maintaining the continuity that is necessary
between the hoses.
NOTE: This adapter has not been tested by the Canadian Standards Association or Factory Mutual.
Installing this adaptor voids previous CSA certification and/or FM approval.
WARNING
Grounding
To reduce the risk of fire, explosion, or electric shock, which
may result from electrical discharge, it is essential that all
parts of the electrostatic system are properly grounded. Static electricity can be generated by the flow of fluid through the
pump, hose, gun, and nozzle, but it is dissipated through
proper grounding as described in the spray gun instruction
manual.
The electrostatic spray gun is grounded through connection
to a properly grounded air supply hose. Use only the Graco
Electrically Conductive Air Supply Hose. Connect the air
hose ground wire to a true earth ground.
If you experience any arcing or feel even a slight shock,
STOP SPRAYING IMMEDIATELY. Check for proper grounding of the entire system. Be sure you have corrected the
problem before starting to spray again.
Relieving Fluid & Air Pressures
To reduce the risk of serious bodily injury, including splashing
in the eyes or on the skin, fluid injection (air-assisted airless
system), injury from moving parts or electric shock, follow the
Pressure Relief Procedure as instructed in your electrostatic spray gun manual.
INSTALLATION
1. Connect the hose adapter between the ends of the
air hoses as shown in Fig 1.
NOTE: The recommended maximum total length of air
hose is 100 ft (30.5 m). The pressure drop
through longer lengths may lower the voltage
from the power supply. A minimum of 2.8 bar (40
psi) air supply pressure is required to ensure full
voltage from the power supply.
2. On all but the last air hose (the one closest to the air
supply), trim the grounding wire to approximately 4
inches (102 mm). Secure the grounding wire to the
air hose outer jacket with electrical tape. Keep the
extra wires and clamp(s).
185–493
3. Connect the grounding clamp of the last air hose to a
true earth ground.
Fig 1
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
COPYRIGHT 1990 GRACO INC.
INSTALLATION
Check the Electrical Grounding (See Fig 1)
Megohmmeter
True Earth
Ground
WARNING
Proper electrical grounding of every part of your
system is essential. For your safety, ground the system
as explained in your electrostatic gun manual. Then
check your system as explained below.
Grounded
Air Hose
1. Make sure the electrostatics are off.
Manual Spray Gun: Turn ES ON–OFF Lever to OFF.
Automatic Spray Gun: Turn off the turbine air.
2. Have a qualified electrician check the electrical
grounding continuity of the spray gun and air hose.
a. With the electrically conductive air hose connected and properly grounded, use a
megohmmeter to measure the resistance between the gun handle and a true earth ground.
Use an applied voltage of 500 minimum to 1000
volts maximum. See Fig 2.
b. If the resistance is greater than 2 megohms,
check the tightness of the ground connections,
and be sure the air supply hose ground wire is
connected to a true earth ground. If the resistance is still greater than 2 megohms, replace
the air supply hose.
Gun
dle
Han-
Fig 2
Grounding Clamp 103–538
Ground Wire 208–950
25 ft. (7.6 m) long, 12 ga. (1.5 mm)
208–950
Using the Air Hose As A Single Hose Again
If an air hose with a trimmed ground wire is going to be
used as a single hose again, have a qualified electrician
splice the ground wire and grounding clamp back onto
the air hose ground wire.
If the original ground wire and clamp are not available,
order grounding clamp 103–538 and ground wire
208–950 and splice them onto the air hose ground wire.
Refer to Fig 3.
Connect the grounding clamp to a true earth ground.
Check the electrical grounding as instructed above.
103–538
Fig 3
TECHNICAL DATA
This graph shows the pressure drop versus the hose
length for the Pro Series of electrostatic spray guns at a
2.8 bar (40 psi) gun inlet pressure.
Pressure Drop Analysis Graph
Factory Branches: Atlanta, Chicago, Dallas, Detroit, Los Angeles, West Caldwell (N.J.)
Subsidiary and Affiliate Companies: Canada; England; Switzerland; France; Germany; Hong Kong; Japan
GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441
PRINTED IN U.S.A.
308–075 8/90