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Introduction
03221
03904A
PRO 5500sc Spray Gun
8 in. (203.2 mm) fluid path
PRO 5500hc Spray Gun
20 in. (711.2 mm) fluid path
Comparison of a PRO 5500sc to a PRO
5500hc Spray Gun
The PRO 5500hc spray gun offers increased electros-
tatic performance when spraying highly conductive
fluids and metallic paints.
In an electrostatic spray gun, the fluid in the fluid tube
becomes a path to ground when the high voltage is
turned on. The amount of current drawn through the
fluid tube depends on the fluid resistivity and the length
of the fluid path to ground.
The PRO 5500sc and PRO 5500hc guns will perform
equally well when spraying fluids with high resistivity,
as shown in the graph below. Even with the shorter
fluid tube of the PRO 5500sc gun, very little current
travels through the fluid, due to its high resistivity, and
the spraying voltage is minimally affected. However,
when the fluid resistivity decreases to low levels, more
current is drawn through the fluid and the spraying
voltage of the PRO 5500sc gun is reduced.
The PRO 5500hc gun can support high voltages when
spraying conductive fluids because the longer fluid
tube increases the total resistance of the fluid column
and reduces the current draw through the fluid.
20
0
Full Spraying Voltage
PRO 5500hc
PRO 5500sc
Low Resistivity
(high conductivity)
High Resistivity
(low conductivity)
kV
Fluid Resistivity MEG CM
NOTE: Fluid resistance
value is approximate.
Actual resistance will
vary depending on the
type of resistance meter
and the fluid being used.
