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Gun Setup
CheckCheck
Check
FluidFluid
Fluid
ResistivityResistivity
Resistivity
To reduce the risk of re, explosion, or electric
shock, check the uid 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 re,
explosion, 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 uid being sprayed meets
the requirements 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.
A high conductivity kit or high conductivity hose may
be required for readings less than 25 megohm-cm.
TableTable
Table
44
4
..
.
FluidFluid
Fluid
ResistivityResistivity
Resistivity
LevelsLevels
Levels
MegohmsMegohms
Megohms
--
-
cmcm
cm
1–7 7–25 25–200 200–2000
High Con-
ductivity
Kit recom-
mended
High Con-
ductivity
Kit may be
needed
Best elec-
trostatic
results
Good elec-
trostatic
results
CheckCheck
Check
FluidFluid
Fluid
ViscosityViscosity
Viscosity
To check uid viscosity you will need:
• a viscosity cup
• a stopwatch.
1. Completely submerge the viscosity cup in
the uid. Lift the cup out quickly, starting the
stopwatch as soon as the cup is completely
removed.
2. Watch the stream of uid coming from the bottom
of the cup. As soon as there is a break in the
stream, shut off the stopwatch.
3. Record the uid type, elapsed time, and size of
the viscosity cup.
4. If the viscosity is too high or too low, contact the
material supplier. Adjust as necessary.
FlushFlush
Flush
BeforeBefore
Before
UsingUsing
Using
EquipmentEquipment
Equipment
The equipment was tested in uid at the factory. To
avoid contaminating your uid, ush the equipment
with a compatible solvent before using the equipment.
GuidelinesGuidelines
Guidelines
forfor
for
AbrasiveAbrasive
Abrasive
MaterialsMaterials
Materials
When spraying abrasive materials, follow these
guidelines:
• Order Part No. 24N704 Electrode (blue) for
abrasive materials.
• Size the nozzle properly to reduce uid pressure
below 30 psi (0.21 MPa, 2.1 bar), producing an
8–12 in. (200–300 mm) uid stream.
• Operate the gun with the uid adjustment knob in
the full ow position at all times. Use an external
uid regulator, not the uid adjustment knob, to set
the uid pressure.
• Use the minimum atomizing and fan air pressures
possible to achieve a good pattern.
• Follow all procedures under
Clean the Gun Daily, page 29.
• Inspect the electrode daily and replace if damaged.
See Electrode Replacement, page 39.
263A2494D