AH-94-04.5
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTIONGENERAL DESCRIPTION
GENERAL DESCRIPTION
The REA process is an air-atomized method for
electrostatically applying coatings to objects.
The REA handgun system (technology) applies
a high voltage DC charge to the applicator elec-
trode, creating an electrostatic field between the
atomizer and the target object.
The REA-90 or REA-90L Delta Electrostatic
Spray Guns (see Figures 1 and 2) applies a -85
kV DC charge to the coating materials at the
point of atomization. This electrostatic charge
allows a more efficient, uniform application of
coating material to the front, edges, sides, and
back of products. It is highly suitable for apply-
ing coatings to a variety of surface configura-
tions: large targets, small parts, tubular wares,
concave and recessed parts, etc. Because it is
a grounded fluid system (for solvent based sys-
tems), it is highly suitable for applying a wide
range of solvent reduced coatings such as
enamels, lacquers, epoxies, etc. The 75786
and 75982 models are available to accommo-
date waterborne materials.
The REA-90 and REA-90L electrostatic spray
guns are transformable between air spray and
HVLP spray technology. The REA-90 is de-
signed for use as a conventional air spray (high-
pressure) or high volume/low-pressure (HVLP)
air spray to atomize the coating material. By
changing a select few parts, the gun may be
transformed to be operated in either spray
mode. (See "Spray Technology Conversion
Procedure" for details.)
A regulated pressure fluid system delivers coat-
ing material to the atomizer. At the time of trig-
gering the applicator, fan and atomization air is
introduced, which atomizes the coating material
into a spray mist. The atomized spray particles
under the influence of the electrostatic field be-
come electrically charged. The charged par-
ticles are attracted to, and deposited on, the tar-
INTRODUCTIONINTRODUCTION
INTRODUCTIONINTRODUCTION
INTRODUCTION
REA-90 and 90L Spray Guns - Introduction
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get object. The forces between the charged
particles and the grounded target are sufficient
to turn most normal overspray around and de-
posit it on the back surface of the target. There-
fore, a high percentage of the coating is depos-
ited on the target.
One of the many features of the REA handgun
system is that the electrical energy, which is
available from the resistive charging electrode,
is limited to the optimum level of safety and effi-
ciency.
This system is incapable of releasing sufficient
electrical or thermal energy during normal oper-
ating conditions to cause ignition of specific
hazardous materials in their most easily ignited
concentrations in air (See NFPA 33 Regula-
tions).
The control unit provides low voltage output to
the gun and contains controls for AC on/off, high
voltage adjust, kV and micro amp meter.
As the gun electrode approaches ground, the
control unit and gun circuitry cause the high
voltage and current to “fold back” and decrease
towards zero for models 75785, 75979, and
75982. For models 75786, the fold back cir-
cuitry in the control unit has been turned off to
provide maximum voltage for waterborne appli-
cations.
> Never use a standard solvent base
handgun system (75785 or 75979) on a
standard waterborne control unit. Failure
to comply may cause damage to equip-
ment and/or risk of fire and injury.
W A R N I N GW A R N I N G
W A R N I N GW A R N I N G
W A R N I N G
!!
!!
!
> Never use a waterborne (75786 or
75982) REA-90 system to spray solvent
reduced coating materials. Failure to
comply may cause damage to equipment
and/or risk of fire and injury.
W A R N I N GW A R N I N G
W A R N I N GW A R N I N G
W A R N I N G
!!
!!
!
