SPRAYABILITY, SCI,
AND RESISTANCE
MEASUREMENT KIT
Sprayability
The
Sprayability Meter
measures whether
materials normally considered being electrically
non-conductive could be electrostatically sprayed
or whether they need to be treated with solutions to
make the surface conductive. The meter measures
the surface resistance and indicates the degree of
sprayability in M
W
or G
W
. The target being sprayed
must be low enough in resistance to dissipate the
electrostatic charge. In some cases the internal
resistance of a target is lower than the surface
resistance. This might allow a target that does not
have a suitable surface resistance reading to be
coated electrostatically without additional surface
preparation. An example of this is certain types
of wood which on the surface are not conductive
but due to moisture content (12%-13%) may be
sprayable.
Since many non-conductive products must be
pre-treated with a conductive solution to make
them sprayable, the Ransburg Multi-Function
Electrostatic Spray Meter is useful to monitor and
maintain consistency in that application, once a
suitable reading is determined.
Operation
1. Set the meter dial to the M
W
or G
W
scale
(see Figure 2). Check the meter calibration by
touching the metallic end of the two (2) probes
on the meter to the stripped bare ends of a
single 12" long wire (see Figure 2). (If desired
the continuity of the wire may be verified by
using a Volt-Ohm meter). If the meter reads
zero, the meter is in calibration. If it does not
C A U T I O N
!
Ensure that meter's scale is properly
set for the function in which it is being used.
Damage to equipment may result if improp-
erly set.
read zero, verify the continuity of the wire and
re-perform the check. If the meter still does not
read zero, consult the factory for repair of the
meter.
2. With the metallic part of the meter probes
pressed firmly and perpendicular against the
surface of the article to be tested, the meter
automatically reads the resistance of the part.
Table 1 lists the readings from an 8333-00
meter and compares it to the readings of the
Multi-Function Meter.
Meter Readings
0
W
to 1.0G
W
- The article is suitable for spraying
using the electrostatic process.
1.0G
W
to 1.5G
W
- The article is questionable for
spraying using the electrostatic process. In such
cases, paint a trial sample article to determine if
a conductive primer or conductive solution for the
part surface is required.
1.5G
W
to Infinity
- The article is
NOT
suitable
for spraying. A conductive primer or conductive
solution is required to treat the surface of the part.
Figure 2: Sprayability Test Meter
OBJECT TO
MEASURE
Test Equipment - Introduction, Operation & Maintenance
TE-98-01.7
8
