Installation
333011D
15
an applied voltage of 500 minimum to 1000
volts maximum. The resistance should not
exceed 1 megohm.
b.
If using a red turbine air hose,
use an ohmmeter
to measure the resistance. The resistance
should not exceed 100 ohms.
5. If the resistance is greater than the maximum read-
ing specified above for your hose, check the tight-
ness of the ground connections and be sure the
turbine air hose ground wire is connected to a true
earth ground. If the resistance is still too high,
replace the turbine air hose.
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. Readings of 25 megohms-cm and above provide
the best electrostatic results.
Check Fluid Viscosity
To check fluid viscosity you will need:
•
a viscosity cup
•
a stopwatch
1. Completely submerge the viscosity cup in the fluid.
Lift the cup out quickly, starting the stopwatch as
soon as the cup is completely removed.
2. Watch the stream of fluid coming from the bottom of
the cup. As soon as there is a break in the stream,
shut off the stopwatch.
3. Record the fluid type, elapsed time, and size of the
viscosity cup.
4. Compare to the chart supplied by viscosity cup
manufacturer to determine your fluid viscosity.
5. If the viscosity is too high or too low, contact the
material supplier. Adjust as necessary.
Install the Fabric Cover
See F
IGURE
9.
1. Install a fabric cover (XX) over the front of the gun
and slide it back to cover the exposed tubing and
hoses at the back of the manifold.
2. Route the exhaust tube (YY) outside the cover. This
enables you to monitor the exhaust tube for the
presence of any paint or solvent. See
Check for
Fluid Leakage
on page 21. Strap down the exhaust
tube to prevent it from moving around.
Flush Before Using Equipment
The equipment was tested in fluid at the factory. To
avoid contaminating your fluid, flush the equipment with
a compatible solvent before using the equipment. See
Flushing
, page 19.
F
IG
. 8 Check Gun Grounding
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,
explosion, and electric shock and result in serious
injury and property damage.
Megohms-cm
1-5
5-25
25-200
200-2000
Test
electrostatic
performance
Good
electrostatic
results
Best
electrostatic
results
Good
electrostatic
results
B
AA
TA
N
F
IG
. 9 . Fabric Cover
WLD
YY
YY
XX
