TW Gema OptiSelect, Operating & Parts Manual

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V 07/07
OptiSelect manual powder gun Function description
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Flat jet nozzle with vented central electrode
The vented flat jet nozzle serves for atomizing and charging of the pow-
der. The powder cloud obtains an oval spray pattern by the slot-shaped
opening. The powder is charged by the central electrode. The high volt-
age, which is created in the gun cascade, is conducted through the black
contact ring of the nozzle holder to the central electrode.
In order to prevent powder from sintering on the electrode, compressed
air is used during the spray process. The compressed air (called rinsing
air) is fed through the small hole in the black contact ring of the nozzle
holder and into the electrode holder.
The rinsing air adjustment on the gun control unit is explained in the cor-
responding operating manual.
Round jet nozzle with vented deflector and
vented central electrode
The vented deflector is used, to give the powder stream emerging from
the gun, a cloud formation. The powder is charged by the central elec-
trode. The high voltage, which is created in the gun cascade, is con-
ducted through the black contact ring of the nozzle holder to the central
electrode.
Since powder can accumulate on the rear side of the deflector, this must
be rinsed with compressed air. The rinsing air is fed through the small
hole in the black contact ring of the nozzle holder into the electrode
holder, and is driven in such a way, that it flows over the surface of the
deflector rear side. The rinsing air cleaning ability depends on the powder
and its sintering ability.
The rinsing air adjustment on the gun control unit is explained in the cor-
responding operating manual.
High voltage
Rinsing air
High voltage
Rinsing air