Check
Check
Check Fluid
Fluid
Fluid Resistivity
Resistivity
Resistivity
To reduce the risk of fire, explosion, or electric
shock, check the fluid resistivity in a non-hazardous
location only. Resistance Meter 722886 and Probe
722860 are not approved for use in a hazardous
location.
Check that the resistivity of the fluid being sprayed
meets the requirements for an electrostatic air spray
system. Graco Part No. 722886 Resistance Meter
and 722860 Probe are available as accessories.
Follow the instructions included with the meter and
probe.
Fluid resistivity readings of at least 20 megohms-cm
generally provide the best electrostatic results and
are recommended.
Table
Table
Table 4
4
4 ... Fluid
Fluid
Fluid Resistivity
Resistivity
Resistivity Levels
Levels
Levels
Megohms
Megohms
Megohms---cm
cm
cm
1–5
5–20
20–200
200–2000
Test elec-
trostatic
perfor-
mance
Good elec-
trostatic
results
Best elec-
trostatic
results
Good elec-
trostatic
results
Check
Check
Check Fluid
Fluid
Fluid Viscosity
Viscosity
Viscosity
A viscosity cup and stopwatch are needed to check
fluid viscosity.
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.
If the viscosity is too high or too low, contact the
material supplier. Adjust as necessary.
Flush
Flush
Flush Before
Before
Before Using
Using
Using Equipment
Equipment
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
3A2495K
25